• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A process for producing a cellulosic shaped body by means of a cellulosic raw material which comprises the steps of bursting a cellulose solution by dissolving cellulosic raw material, extruding the prepared cellulose solution to form a shaped body, and coagulating and regenerating the cellulose to produce the cellulosic shaped body, wherein the cellulosic raw material is mixed with a second cellulosic raw material prior to preparing the cellulose solution.
    公开号:AT517020A1
    申请号:T58/2015
    申请日:2015-02-06
    公开日:2016-10-15
    发明作者:
    申请人:Chemiefaser Lenzing Ag；
    IPC主号:
    专利说明:

    Recycling celhifosiscfien * KuVist fibers
    Field of the invention:
    This invention provides a process for producing a cellulosic shaped body by means of a cellulosic raw material, comprising the steps of preparing a cellulose solution by dissolving cellulosic raw material, extruding the prepared cellulose solution to form a shaped body, and coagulating and regenerating the cellulose to produce the cellulosic shaped body, wherein the cellulosic raw material is mixed before producing the cellulose solution with a second cellulosic raw material. The products obtained in this way are high-quality regenerated cellulosic moldings from recycled waste, which are suitable for textile and nonwoven production.
    Prior Art: US 4,145,533 describes a process for recycling regenerated cellulose wastes such as uncoated cellophane and rayon from the viscose process. In this process, the cellulosic waste is first shredded, before the emulsion xanthogenation in aqueous sodium hydroxide solution and carbon disulfide between 18 ° C and 30 ° C. The thus prepared waste viscose is then blended with up to 15% by weight of conventional production viscose to produce regenerated cellulose products. The emulsion xanthogenation solution initially contains about 10.8% by weight of sodium hydroxide and at least 40% by weight of carbon disulfide based on the weight of the cellulose. Up to 8% by weight of the total cellulose in the mixture is from waste cellulose. In addition, the solution contains surfactants or emulsifiers. This method requires two independent complete alkalization and xanthogenation lines. US 2,184,586 claims a method for converting waste cellulosic regenerate into cellulose xanthogenate. The waste yarns resulting from the rayon production are treated in the first step with a sodium hydroxide solution in a concentration of 16% to 17.5% for one to one and one-half hours. After wetting the impregnated fibers, crushing was carried out in crushers for two hours at 18 ° C to 29 ° C, prior to a ripening step lasting 25 to 35 hours. The xanthogenation was carried out for 1.5 to 2 hours with 7 liters of carbon disulfide per 100 kg
    Alkalicellulose performed. After dissolving 100% of the xanthogen in 130 liters of sodium hydroxide 0.4% to 0.5%, a spun spinning viscose was prepared. The degree of polymerization of the fibers thus obtained is generally too low to give good mechanical fiber properties.
    The patents US 3,914,130 and US 3,817,983 both describe the use of various cellulosics including regenerated cellulose for the production of viscose. They claim a process in which ball mill-milled cellulosics of conventionally-prepared pulp-derived alkali cellulose are added before or after maturation. The alkali cellulose prepared in this way is further processed as described in US Pat. No. 3,817,983 by means of the classical viscose process in order to produce viscose. The resulting viscose may be used to form into a sponge, cast into a film, or to form a fiber, but the degree of polymerization of the fibers thus obtained is generally too low to give good mechanical fiber properties. WO 2007/070904 discloses a process for producing vat-dyed cellulosic fibers or films by using cellulosic raw materials already containing vat dyes in molecularly disperse form, in addition to at least one other cellulosic raw material. The cellulosic raw materials can be selected from pulp, cellulosic natural or synthetic fibers or spun-off fibers from fiber production. However, this document does not address all the problems that are caused by the use of such spun waste or how to solve them.
    None of the recycling possibilities described above involve any chemical pretreatment processes of the recovered cellulosic raw material before it is used in the viscose process, nor does it show any possibility of using large quantities of recovered cellulosic raw materials to obtain cellulosic molded articles with good mechanical properties ,
    Moreover, the utility of recovered cellulosic raw material may be limited due to the fact that textiles, other than cellulose, usually contain other chemicals such as dyes, resins, optical brighteners, etc., and also during their lifetime, for example, by plasticizers or bleaches during the course of their life
    Washing can be contaminated. In addition, both pre and post consumer consumer cotton waste contain significant amounts of metals. These metals can come from the abrasion of buttons or zippers.
    The presence of any of these chemicals interferes with or limits the use of the recovered cellulosic raw material in the viscose process. For example, resins chemically bond cellulosic molecules together, rendering them insoluble and unreactive. These substances can not be removed from the recovered cellulosic raw material by simple mechanical comminution steps of the cellulosic raw material.
    However, these chemicals can cause a high content of particles in the spinning masses which requires a higher filtration cost, resulting in increasing equipment costs and lower productivity. Too high a particle content can lead to a reduction of the service life of the filtration system and in the worst case even to its complete blockage. In addition, large quantities of small particles which can not be removed from the dope by spinning can cause spinneret problems due to clogging of individual spinneret holes and thereby reduced spinneret life which, in turn, results in lower productivity and / or lower quality fibers entails.
    Task:
    In view of this prior art, the problem to be solved was to provide a method which allows the use of as high as possible quantities of recovered cellulosic raw material for the production of cellulosic shaped bodies, and thus a possibility for efficient recycling of cellulosic raw material to high quality To provide products that are suitable for example for the production of textiles and nonwovens.
    Summary of the invention:
    This object has been achieved by a process for producing cellulosic shaped bodies by means of a recovered cellulosic raw material and a cellulosic neurochemical which comprises the following steps: a) optionally mechanical * sciiredclem * of the * recovered cellulosic raw material, b) optionally pretreating the recovered cellulosic raw material in one C) in an alkalization stage, dipping the recovered cellulosic raw material in sodium hydroxide and subsequently pressing it, d) pre-ripening the alkali cellulose thus obtained, e) xanthogenating the alkali cellulose in a xanthogenation step, and subsequently dissolving the cellulose xanthogenate; f) extruding the thus obtained cellulose xanthate solution to form a molded article; g) coagulating and regenerating the cellulose to remove the cellulosic material In an additional combination step, before step e), the alkali cellulose made from the recovered cellulosic raw material is combined with alkali cellulose, which is prepared in a second alkalization line from the cellulosic neurochemical, and wherein the combined alkali celluloses in the
    Xanthogenation step e) are further processed together.
    The step a) of the mechanical shredding comprises, if appropriate, grinding steps when the raw material contains larger aggregates, sheets, etc., and opening steps, for example when the material is provided in compressed bales, as well as other steps required to produce the raw material Particle size, which is suitable to carry out the following steps in a suitable manner.
    In or prior to the optional pretreatment step b), raw material fiber mixtures must be separated to remove contaminants from noncellulosic fibers prior to alkalization. In the prior art, there are well-known methods that depend mostly on the nature of the impurities with non-cellulosic fibers.
    The xanthogenation of the alkali cellulose in a xanthogenation step and the subsequent solution of the cellulose xanthogenate in step e) can be carried out by the known viscose or modal method; the composition (cellulose content,
    Alkali content, ...) the viscose depends * on the * type * and the quality of the final product to be produced. For the purpose of this invention, the term "cellulosic raw material 4 includes all types of cellulosic synthetic fibers made by the viscose, modal or lyocell method. The raw material may contain matting agents (eg T1O2) without adversely affecting the process according to the invention. Likewise, colorless or colored raw materials can be used. If desired, dye can be removed by known dye-selective discoloration techniques. Metals, such as magnesium, can cause filtration problems for the viscose, and should preferably be removed by means of an acid pretreatment step, a complexing agent, or a combination of both. In the case of crosslinked cellulosic raw materials, it is necessary to remove the respective crosslinker before the alkalization step. This can be done, for example, for urea-type crosslinkers (eg, DMDHEU) by acidic or basic hydrolytic cleavage methods described in the literature (eg, Textile Research Journal, 1985, 55, 444-448). Preferably, the recovered material should not contain crosslinked cellulosic materials. This can be analyzed, for example, by elemental analysis, online IR spectrometry, the Kjeldahl method (Zeitschrift für Analytische Chemie, 1883, 366-382), or other methods known to those skilled in the art.
    If the raw material contains noncellulosic materials, for example in the case of a fiber blend (eg blend with polyester), the noncellulosic fibers must be quantitatively removed prior to the alkalization step by techniques known in the art. In order to keep the initial quality, in particular the average molecular weight of the cellulosic raw material, as high as possible, gentle and non-cellulose-destroying processes are preferred for any required pretreatment.
    In a preferred embodiment of the process according to the invention, the recovered cellulosic raw material was recovered from pre and / or post consumer use waste containing cellulosic synthetic fibers made by the viscose, modal or lyocell process.
    In a preferred embodiment of the method according to the invention, the wastes obtained before and / or after use by consumers additionally contain noncellulosic fibers, and these noncellulosic fibers must be quantitatively separated from the recovered cellulosic raw material prior to the alkalization step. This separation can be accomplished by methods generally well known in the art.
    In a further preferred embodiment of the process according to the invention, the metal removal stage is an acidic wash treatment and / or a treatment with a complexing agent. The complexing agent is preferably used in the form of an aqueous solution.
    In still another preferred embodiment of the method of the invention, an acidic wash treatment and a complexing agent treatment in the metal removal step are combined into one step by adding a complexing agent to the acidic wash treatment.
    Depending on the nature of the dye, the optional decolorization step according to the invention is carried out using methods which are generally best known in the art. In the optional crosslinker removal step, the crosslinker, which is likely to be urea-type, can be removed by an acidic or basic step.
    Preferably, in the method according to the invention, the shaped article produced by means of the method according to the invention is a staple fiber, a filament fiber, a sponge or a film of the viscose or modal type. Resulting molded articles are preferably used for further processing into textile or nonwovens products.
    In a particularly preferred embodiment of the method according to the invention, the difference between the intrinsic viscosity (IV) of the alkali cellulose from the recovered cellulosic raw material and the cellulosic neurochemical alkali cellulose is less than or equal to 30 ml / g, preferably less than 10 ml / g. In another preferred embodiment of the present invention, the required viscosities of the two alkali celluloses prior to mixing are primarily dependent upon the type of product desired and the product quality desired, as well as the proportion of cellulosic raw material in the final product.
    Preferably, in the process of the present invention, the recovered cellulosic raw material is a staple fiber, a filament fiber, a sponge or a viscose or modal type or lyocell type film.
    In a preferred embodiment, in the combining step, the proportion of the recovered cellulosic raw material is 10 to 90%, preferably 20 to 80%, especially 40 to 60%, always expressed in terms of weight percent of pure cellulose, while the remainder is cellulosic neurochemical.
    Detailed description of the method according to the invention (see also the flowchart in FIG. 1):
    Cellulosic raw materials ("CRM") consisting of 100% cellulosic raw materials such as lyocell, modal or viscose in the form of fibers or textiles (before or after use by brewers) are first shredded; The cellulosic raw materials may be dull or shiny, colored or contain other chemicals from earlier processes.
    An optional pre-treatment step, for example to remove metals, softening or other chemicals, may, if necessary, be carried out by known methods prior to the alkalization step. Crosslinkers can be removed by basic or acidic conditions or other methods known in the literature (e.g., Textile Research Journal, 1985, 55, 444-448). Preferably, crosslinked cellulosic materials should be avoided. Removal of metals can be accomplished using a complexing agent or a combination of such steps.
    The acidic wash treatment according to the present invention may be at pH values between 1.5 and 5, preferably between 2 and 3, at temperatures between room temperature and 100 ° C, preferably between 50 and 70 ° C, for 15 to 120 minutes, preferably 15 up to 60 minutes.
    The Metallentfemung according to the present invention can also by treating the recovered cellulosic raw material with an aqueous solution of a »mm m w 9 mm mm m
    Complexing agent to be performed. Preferably, the concentration of the complexing agent in the aqueous solution is less than 5 kg per ton of oven-dry pulp (odtp) and in particular less than 2 kg / odtp. The treatment of the cellulosic waste material with an aqueous solution of a complexing agent may be carried out at temperatures between room temperature and 100 ° C, preferably between 50 and 80 ° C, for 15 to 120 minutes, preferably 15 to 90 minutes long.
    The acidic washing step and the treatment with an aqueous solution of a complexing agent can be combined by adding the complexing agent to the acidic washing liquid to a process step.
    If desired, dye may also be removed in this step by employing dye-selective destaining techniques.
    The minimum viscosity of the cellulosic raw materials after shredding and other washing steps and / or pretreatments used depends on the fiber type (viscose or modal) to be produced, the desired fiber quality and the required proportion of the cellulosic raw material in the product. Preferably, the viscosity of the recovered fibers prior to the alkalizing step should be at least at the level of the alkali cellulose from conventional pulp after pre-ripening or above. The preferred viscosity, expressed as GVZ ("Limiting Viscosity Number") in the unit [ml / g], will be greater than 380 ml / g for modal fibers or greater than 220 ml / g for viscose fibers. A low level of cellulosic raw material in the final product may also allow for a lower degree of viscosity of the recovered raw material than that of the alkali cellulose from conventional chemical pulp without compromising the quality of the final product; Accordingly, the viscosity of the alkali cellulose cellulose raw material ("AC CRM") should preferably not be less than 80% of the CVC of the chemical pulp. The shredded cellulose raw material is then dipped (according to patent AT 287905) in sodium hydroxide and then squeezed to obtain the corresponding alkali cellulose ("AC CRM").
    The dipping step may be followed by an optional pre-ripening step of the AC CRM (by methods known in the art): ripening time and temperature are adjusted according to the starting viscosity (CV) of the CRM such that the difference between the
    Intrinsic viscosity of the alkali cellulose from the recovered cellulosic raw material (AC CRM) and the cellulosic neurochemical alkali cellulose (the conventionally prepared chemical cellulosic cellulose) is less than or equal to 30 ml / g, preferably less than 10 ml / g, after the pre-strip; in the case of mixtures with standard chemical pulp, lower or higher viscosity grades are possible than with alkali cellulose from conventional chemical pulp (depending on the mixing ratio and desired quality of the final product). The required degree of viscosity also depends on the requirements and the type of final product. For example, a viscose fiber comparatively requires a lower alkali cellulose viscosity (GVZ of 220 to 280 ml / g) than a high quality modal fiber (GVZ of 300 to 400 ml / g). In all cases, the average viscosity of the final alkali cellulose, either pure recovered raw materials or equivalent blends with conventional chemical pulp, should preferably be between 380 and 470 ml / g for modal and between 240 and 300 ml / g for viscose. In the case of a certain viscosity of the alkali cellulose produced from regenerated cellulosic material below 380 ml / g for Modal or 240 ml / g for viscose, the preferred average viscosity grade of the mixture (between 380 and 450 ml / g for Modal and between 240 and 300 ml / g for viscose) can be adjusted by a corresponding higher viscosity of the alkali cellulose from conventional chemical pulp of a certain mixing ratio, or the desired average viscosity degree of the alkali cellulose mixture can be adjusted by adjusting the mixing ratio.
    As a first example, if 80% conventional alkali cellulose and 20% AC CRM were to be mixed with GVZ 350 ml / g to obtain a nominal viscosity of 420 ml / g of the mixture, the GVZ of conventional alkali cellulose must be ~ 438 ml / g be set. As a second example: If conventional alkali cellulose was to be mixed with GTV 450 ml / g and AC CRM with GTV 400 ml / g to obtain an average viscosity of the alkali cellulose of 420 ml / g, the mixing ratio must be 40% conventional alkali cellulose and 60% % AC CRM.
    Since AC CRM and conventional alkali cellulose from chemical pulp usually do not have the same degree of viscosity, according to the invention the pre-ripening step of AC CRM and the alkali cellulose from conventional pulp must be carried out separately in two parallel streets or alternatively - in another preferred one
    Embodiment of the invention - in only one * ripening device. In the latter embodiment, the AC CRM may be added to the ripening device at a later stage than the conventional alkali cellulose. This must be done so that the AC CRM meets the required swelling time to obtain the desired final viscosity. From an economic point of view, this makes sense in the case of a low proportion of AC CRM of less than 10% in the final alkali cellulosic mixture.
    The proportion of pre-mature AC CRM in the final alkali cellulosic mixture can range from 1 to 99% calculated on pure cellulose. The use of AC CRM is not limited to blends with alkali cellulose from chemical pulp, but can also be used in pure form. For logical reasons, the ratio of AC CRM and conventional alkali cellulose can be adjusted in mixtures in order to make economic sense in the case of a second alkali cellulose preparation line (> 10% AC CRM, calculated on pure cellulose). Alternatively, especially in the case of a proportion of AC CRM below 10%, the AC CRM may be added to the conventional alkali cellulose in the ripening device at a later stage to meet the required residence time necessary to maintain the degree of viscosity of AC CRM adjust. In the case of two different alkali cellulose preparation lines, mixing can be carried out directly in the xanthogenation apparatus, with mixing taking place in the ripening apparatus anyway in the case of only one cellulosic cellulase line.
    The mixture of AC CRM and conventional alkali cellulose ("alkali cellulosic blend") is then converted to the dope by the viscose method known in the art, in particular by the steps of treating the alkali cellulose mixture with carbon disulfide, dissolving the xanthate in sodium hydroxide solution, dissolving the Ripening the viscose solution and finally • bleeding the spinning mass.
    The cellulose concentration of the final viscose or modal spinning mass can be adjusted so that the degree of viscosity, measured as falling ball viscosity, is in the range of 60 to 100 seconds for the viscose and 80 to 150 seconds for the modal production. The cellulose content for the production of viscose should be 8 to 10% by weight, based on pure www 9 9 9 9 9 9 9
    Cellulose in the final dope; for the Modalherstellung he should amount to 5-8%. In particular, when high levels of low viscosity recovered cellulosic material are used as the raw material, the cellulose concentration in the final dope may be increased to the upper concentration to obtain the corresponding falling ball viscosity of the final dope as a basis for good fiber quality.
    Depending on the composition of the spinning dope (cellulose concentration, alkali content) and the corresponding precipitation bath (spinning bath), various cellulosic bodies can be produced, for example modal or viscose fibers, films, mold composites, sponges, etc .; detailed process descriptions for the production of viscose fibers are Gotze, "Chemiefasern nach den Viskoseverfahren", 3rd edition, 1967, refer; a detailed description of the method for the production of modal fibers can be found in the Austrian patent AT 287905.
    Recovered cellulosic furnish containing colored cellulosic fibers can be readily used for applications where color is not relevant, for example, in fibers for insulation, filler, etc.
    Examples:
    The invention will now be illustrated by way of examples. These examples in no way limit the scope of the invention. The invention also includes any other embodiments based on the same inventive idea.
    Example 1: Use of 70% recycled viscose fibers for the production of viscose fibers
    Shiny viscose staple fibers were first mechanically shredded and then extracted with EtOH to remove the finish from the fibers. Before being squeezed, the shredded viscose fibers were immersed in sodium hydroxide. The alkali cellulose with a. GVZ viscosity of 185 ml / g was then blended, without any pre-ripening, with 30% of an alkali cellulose made from conventional chemical pulp (Lenzing standard pulp) to give a 225 ml / g viscosity of the alkali cellulosic mixture. The viscose gum consisted after xanthogenation, dissolution and
    Tire made of 9.19% cellulose and had a ball fall viscosity of 47 seconds. The properties of the spun rayon fibers are shown in Table 1.
    Example 2: Use of 100% recycled modal fibers for the production of viscose fibers
    The viscose gum, prepared from shiny modal fibers as raw material, was prepared in the same manner as described in Example 1 without pre-ripening of the corresponding alkali cellulose having a viscosity of 231 ml / g. The corresponding viscose gum containing 9.17% cellulose having a falling ball viscosity of 50 seconds was then spun into viscose fibers having the properties shown in Table 1.
    Example 3: Use of 100% recycled lyocell fibers for the production of modal fibers
    Shiny, 6 mm short, cut Lyocellfasem were pretreated and then reacted according to Example 1 in the corresponding alkali cellulose having an alkali cellulose viscosity of 371 ml / g without pre-ripening. The subsequently formulated modal spinning mass, containing 6.15% cellulose having a falling ball viscosity of 75 seconds, was then spun into modal fibers having the properties shown in Table 1.
    Example 4: Use of 20% recycled lyocell fibers for the production of modal fibers
    Lyocell fibers were reacted according to Example 3 in the corresponding alkali cellulose. The alkali cellulose having a GVZ viscosity of 382 ml / g was then blended without pre-ripening with 80% of conventional alkali cellulose from Lenzing's internal chemistry pulp to obtain a viscosity of the alkali cellulosic mixture of 412 ml / g. After reacting the alkali cellulosic mixture into a modal viscose (6.08% cellulose, falling ball viscosity 82 seconds), the viscose was spun into modal fibers having properties summarized in Table 1.
    Example 5: Use of 10% recycled Lyocell sheet (blue) for the production of modal fibers
    A blue-colored sheet consisting of 100% Lyocell was mechanically shredded and then, without any further pretreatment, reacted according to Example 4 directly into the corresponding alkali cellulose. The freshly recovered "lyocell alkali cellulose" having an alkali cellulose viscosity of 340 ml / g without pre-ripening was then mixed with conventional Lenzing internal chemical pulp alkali cellulose at a ratio of 10% "lyocell alkali cellulose" and 90% "pulp alkali cellulose"; to obtain an alkali cellulosic mixture having a viscosity of 455 ml / g. The alkali cellulosic mixture was further reacted according to Example 3 into a modal spinning mass (6.06% cellulose, falling ball viscosity 98 seconds) to obtain, after spinning, modal fibers having properties listed in Table 1.
    Example 6: Use of 55% recycled Lyocell sheet (blue) for the production of modal fibers
    The process according to the invention was carried out in the same manner as described in Example 5, but with an alkali cellulose mixture of chemical pulp and lyocell fibers in a ratio of 55% "lyocell alkali cellulose" and 45% "cellulose cellulose". The viscosity of the "lyocell alkali cellulose" was 332 ml / g, the viscosity of the alkali cellulosic mixture 432 ml / g. The alkali cellulosic mixture was further reacted according to Example 3 in a modal spinning mass containing 5.99% cellulose with a falling ball viscosity of 83 seconds. The modal fiber properties achieved are shown in Table 1.
    Example 7: Use of 20% recycled lyocell matt for the production of viscose fibers
    Matte lyocell fibers (matting agent T1O2) were reacted according to Example 1 into the respective alkali cellulose. The "lyocell alkali cellulose" was pre-ripened to a GVZ viscosity of 235 ml / g and mixed in a proportion of 20% with an alkali cellulose of Lenzing internal chemical pulp to obtain a viscosity of the mixture of 230 ml / g. The corresponding viscose gum, after xanthogenation, dissolution and ripening, contained 8.88% cellulose having a falling ball viscosity of 57 seconds. The viscose fiber properties are shown in Table 1.
    Example 8: Comparative Example; Use of 100% Lenzing internal
    Chemical pulp for the production of viscose fibers
    Viscose fibers were made in the same manner as in Example 1, differing only in the kind of the raw material. The same chemical pulp was used in all examples for producing viscose fibers. The obtained isose fiber properties are shown in Table 1.
    Example 9: Comparative Example; Use of 100% Lenzing internal
    Chemical pulp for the production of modal fibers
    Modal fibers were made in the same manner as in Example 2, differing only in the nature of the raw material: the same chemistry pulp was used in all examples to make modal fibers. The modal fiber properties achieved are shown in Table 1.
    Examples 3 to 6 show impressively that the invention set forth herein enables the production of high quality fibers by means of large amounts of recycled material. Such fibers of the present invention have properties comparable to those made from ordinary chemical pulp.
    Table 1:
    权利要求:
    Claims (9)
    [1]
    Claims 1. A process for producing a cellulosic body by means of a recovered cellulosic raw material and a cellulosic neurochemical comprising the steps of: a) optionally mechanically shredding the recovered cellulosic raw material, b) optionally pretreating the recovered cellulosic raw material in a metal removal step, a decolorization step and / or c) in an alkalization step, dipping the recovered cellulosic raw material in sodium hydroxide and subsequently pressing it, d) optionally pre-ripening the alkali cellulose thus obtained, e) xanthogenizing the alkali cellulose in a xanthogenation step and subsequently dissolving the cellulose xanthogenate, f) Extruding the thus obtained cellulose xanthate solution to form a shaped article; g) coagulating and regenerating the cellulose to form the cellulosic shaped article in which, before step e), in an additional combining step, the alkali cellulose made from the recovered cellulosic raw material is combined with alkali cellulose produced from the cellulosic neurochemical in a second alkalization line, and the combined alkali celluloses are further processed together in the xanthogenation step e) become.
    [2]
    2) Method according to claim 1, wherein the recovered cellulosic raw material has been obtained from pre and / or post consumer use waste containing cellulosic synthetic fibers made by the viscose, modal or lyocell method.
    [3]
    3) The method of claim 1, wherein the wastes obtained before and / or after use by consumers additionally contain noncellulosic fibers and wherein these noncellulosic fibers are quantitatively separated from the recovered cellulosic raw material prior to the alkalization step.
    [4]
    4) The method of claim 1, wherein the "Metällntfemungsstufe is an acidic washing treatment and / or a treatment with a complexing agent.
    [5]
    5) The method of claim 4, wherein an acidic wash treatment and a treatment with a complexing agent in the Metallentfemungsstufe be combined by adding a complexing agent to the acidic wash treatment in one step.
    [6]
    6) The method of claim 1, wherein the shaped body is a staple fiber, a filament fiber, a sponge or a viscose or modal type film.
    [7]
    7) The method of claim 1, wherein the difference between the limiting viscosity of the alkali cellulose from recovered cellulosic raw material and the cellulosic neurochemical alkali cellulose is less than or equal to 30 ml / g, preferably less than 10 ml / g.
    [8]
    8) The method of claim 1, wherein the recovered cellulosic raw material is a staple fiber, a filament fiber, a sponge or a viscose or modal type or lyocell type film.
    [9]
    9) The method of claim 1, wherein in the combination step, the proportion of the recovered cellulosic raw material of 10 to 90%, preferably from 20 to 80%, in particular from 40 to 60%.
    类似技术:
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    同族专利:
    公开号 | 公开日
    WO2016123643A1|2016-08-11|
    AT517020B1|2020-02-15|
    TWI690547B|2020-04-11|
    US10370778B2|2019-08-06|
    JP2018505973A|2018-03-01|
    TR201820518T4|2019-01-21|
    EP3253912B1|2018-11-21|
    CN107208325A|2017-09-26|
    TW201702296A|2017-01-16|
    CN107208325B|2021-01-26|
    ES2710616T3|2019-04-26|
    US20180002836A1|2018-01-04|
    EP3253912A1|2017-12-13|
    JP6629869B2|2020-01-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR837886A|1937-07-23|1939-02-22|Snia Viscosa|Process for the manufacture of artificial textile fibers having characteristics similar to those of rayon|
    US2647891A|1949-09-26|1953-08-04|Du Pont|Viscose recovery|
    DE907051C|1949-11-01|1954-02-11|Rayonier Inc|Process for the production of viscose from cotton, in particular linters|
    AT287905B|1968-09-20|1971-02-10|Chemiefaser Lenzing Ag|Process for the production of thread from regenerated cellulose|
    US3758457A|1972-01-25|1973-09-11|Du Pont|Process for recovering regenerated cellulose|
    US3817983A|1972-05-01|1974-06-18|Du Pont|Process using diverse types of cellulose for preparing viscose|
    US3914130A|1974-05-08|1975-10-21|Du Pont|Process for adding particulate cellulose to alkali cellulose|
    DE2802394C2|1978-01-20|1979-12-13|Hoechst Ag, 6000 Frankfurt|Process for the production of threads, fibers and films according to the viscose process|
    US4145533A|1978-07-26|1979-03-20|Olin Corporation|Method for recycling regenerated cellulose scrap|
    US4946953A|1986-10-16|1990-08-07|Kanebo, Ltd.|Fine cellulose particles and process for production thereof employing coagulated viscose|
    JP2627642B2|1988-06-11|1997-07-09|チッソ株式会社|Powder cosmetics|
    AT392972B|1988-08-16|1991-07-25|Chemiefaser Lenzing Ag|METHOD FOR PRODUCING SOLUTIONS OF CELLULOSE AND DEVICE FOR IMPLEMENTING THE METHOD|
    DE4118899C1|1991-06-08|1992-10-22|Degussa Ag, 6000 Frankfurt, De|
    US5331801A|1992-01-24|1994-07-26|Eco Fibre Canada Inc.|Recycled yarns from textile waste and the manufacturing process therefor|
    ATA53792A|1992-03-17|1995-02-15|Chemiefaser Lenzing Ag|METHOD FOR PRODUCING CELLULOSIC MOLDED BODIES, DEVICE FOR IMPLEMENTING THE METHOD AND USE OF A SPINNING DEVICE|
    US6010594A|1993-03-03|2000-01-04|Ahlstrom Machinery Corporation|Method of bleaching pulp with chlorine-free chemicals wherein a complexing agent is added immediately after an ozone bleach stage|
    US5447603A|1993-07-09|1995-09-05|The Dow Chemical Company|Process for removing metal ions from liquids|
    US5369861A|1994-01-21|1994-12-06|Burlington Industries, Inc.|Process for recycling denim waste|
    US5481864A|1994-07-11|1996-01-09|Wright; Herbert J.|Cloth scrap recycling method|
    AT401392B|1994-09-05|1996-08-26|Chemiefaser Lenzing Ag|METHOD FOR PRODUCING A CELLULOSIC MOLDED BODY|
    DE4444245C1|1994-12-13|1996-07-04|Hoechst Ag|Process for recycling colored, cellulosic waste products into fibers|
    AT401779B|1995-02-02|1996-11-25|Chemiefaser Lenzing Ag|Production of formed cellulose products - comprises spinning a solution of cellulose in aqueous tert.amine oxide and recycling the precipitation bath after regeneration to a specified range of pH|
    AT408547B|1995-09-26|2001-12-27|Chemiefaser Lenzing Ag|METHOD FOR TRANSPORTING A SOLUTION OF CELLULOSE IN AN AQUEOUS TERTIARY AMINOXIDE|
    GB9617043D0|1996-08-14|1996-09-25|Courtaulds Plc|Manufacture ofd extruded articles|
    US6471727B2|1996-08-23|2002-10-29|Weyerhaeuser Company|Lyocell fibers, and compositions for making the same|
    US6306334B1|1996-08-23|2001-10-23|The Weyerhaeuser Company|Process for melt blowing continuous lyocell fibers|
    WO1998022642A1|1996-11-21|1998-05-28|Toyo Boseki Kabushiki Kaisha|Regenerated cellulosic fibers and process for producing the same|
    AU7042200A|1999-07-14|2001-01-30|Grupo Cydsa, S.A. De C.V.|Process for the fabrication of activated cellulose and derivatives thereof|
    US7052578B2|2000-01-28|2006-05-30|Martin Marietta Magnesia Specialties, Inc.|Process employing magnesium hydroxide in peroxide bleaching of mechanical pulp|
    US6378179B1|2001-01-05|2002-04-30|Gary F. Hirsch|System and method for reconstituting fibers from recyclable waste material|
    DE10102334C2|2001-01-19|2003-12-04|Thueringisches Inst Textil|Process for the production of regular, monodisperse cellulose beads and their use|
    US7132469B2|2002-06-28|2006-11-07|Reinforced Polymers, Inc.|Molding compositions with solid thermoplastic elastomer thickeners and products obtained therefrom|
    US20040131690A1|2002-09-20|2004-07-08|Lynch Maurice Gerard|Beads and methods of preparation|
    WO2004043329A2|2002-11-12|2004-05-27|L'oreal|Use of cellulose microbeads to make the skin matt|
    FI117393B|2003-01-10|2006-09-29|Kemira Oyj|Process for bleaching cellulose fiber material|
    US6833187B2|2003-04-16|2004-12-21|Weyerhaeuser Company|Unbleached pulp for lyocell products|
    AT502993B1|2005-12-19|2008-07-15|Chemiefaser Lenzing Ag|METHOD FOR PRODUCING A DYED CELLULOSIC FORM BODY|
    US7390566B2|2006-06-30|2008-06-24|Weyerhaeuser Company|Viscose product|
    FI119375B|2007-02-02|2008-10-31|Kemira Oyj|A novel composition and method for treating fibrous material|
    WO2009037146A1|2007-09-17|2009-03-26|Basf Se|Crosslinked cellulose beads|
    AT505905B1|2007-09-21|2009-05-15|Chemiefaser Lenzing Ag|CELLULOSE POWDER AND METHOD FOR THE PRODUCTION THEREOF|
    US20100297445A1|2007-11-22|2010-11-25|Basf Se|Production of spherical particles from solutions comprising a water-miscible solvent by the method of underwater pelletization|
    AT507758A1|2008-12-23|2010-07-15|Chemiefaser Lenzing Ag|YARN AND THREADS FROM BLENDS OF FIBERS AND ARTICLES THEREFROM|
    WO2011077446A1|2009-12-23|2011-06-30|Varun Gambhir|Process for recycling cotton fabrics|
    WO2011130276A2|2010-04-12|2011-10-20|Enova Textile And Apparel, Llc|Processes for using recycled waste cotton material in producing a textile product and textile products produced form waste cotton material|
    WO2012002729A2|2010-06-30|2012-01-05|코오롱인더스트리 주식회사|Dope for spinning lyocell, method for preparing a lyocell filament fiber using same, and method for preparing a lyocell staple fiber using same|
    CA2828980C|2011-03-08|2019-02-26|Sappi Netherlands Services B.V.|Method for dry spinning neutral and anionically modified cellulose and fibres made using the method|
    CN102677230A|2011-03-12|2012-09-19|咸立强|Environment-friendly method for producing renewable cotton|
    CN102199310B|2011-05-17|2013-01-02|东华大学|Method for recycling cotton-containing components in waste cotton-polyester blended fabrics|
    AT511624B1|2011-07-13|2014-02-15|Chemiefaser Lenzing Ag|CELLULOSE II SUSPENSION, THEIR PREPARATION AND STRUCTURES MADE THEREFROM|
    AR088787A1|2011-08-30|2014-07-10|Cargill Inc|PULP COMPOSITION|
    CN102660791A|2012-04-15|2012-09-12|广东巨洋环保科技有限公司|Old clothes recovery method|
    CN104379833B|2012-05-28|2016-05-11|索德拉细胞公司|New technology and the dissolving pulp of manufacturing by this technique|
    CN104411881B|2012-07-06|2015-11-25|日本制纸株式会社|Regenerated fiber and regenerated fiber products formed|
    CN103435839A|2013-07-30|2013-12-11|东华大学|Green recovery method for converting abandoned clothing into regenerant|
    CN103388188B|2013-07-30|2015-08-12|东华大学|A kind ofly discarded duds thing is utilized to prepare the method for colored fiber|
    AT515180B1|2013-10-15|2016-06-15|Chemiefaser Lenzing Ag|Three-dimensional cellulosic molding, process for its preparation and its use|
    AT515174B1|2013-10-15|2019-05-15|Chemiefaser Lenzing Ag|Cellulose suspension, process for its preparation and use|
    AT515152B1|2013-11-26|2015-12-15|Chemiefaser Lenzing Ag|A process for pretreating recovered cotton fibers for use in the manufacture of regenerated cellulose moldings|
    TWI667378B|2014-01-03|2019-08-01|奧地利商蘭精股份有限公司|Cellulosic fibre|
    US20160369456A1|2014-04-17|2016-12-22|Evrnu, Spc|Methods and systems for processing cellulose-containing materials and isolating cellulose molecules; methods for regenerating cellulosic fibers|AT515152B1|2013-11-26|2015-12-15|Chemiefaser Lenzing Ag|A process for pretreating recovered cotton fibers for use in the manufacture of regenerated cellulose moldings|
    CN110546317A|2016-12-06|2019-12-06|雷纽赛尔公司|Cellulose fiber|
    CN110678485B|2017-05-14|2021-11-23|华盛顿州立大学|Environmentally friendly cellulosic waste recycle|
    EP3511449A1|2018-01-15|2019-07-17|Lenzing Aktiengesellschaft|Reuse of lyocell cellulose for lyocell method|
    EP3511447A1|2018-01-15|2019-07-17|Lenzing Aktiengesellschaft|Functionalization of foreign substances in lyocell method|
    CN111304767A|2020-02-17|2020-06-19|河北吉藁化纤有限责任公司|Preparation method for producing regenerated cellulose fiber by using waste textile regenerated pulp and regenerated cellulose fiber|
    EP3882380A1|2020-03-16|2021-09-22|Re:NewCell AB|One stage method for acid metal removal and bleach|
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    申请号 | 申请日 | 专利标题
    ATA58/2015A|AT517020B1|2015-02-06|2015-02-06|Recycling of cellulosic synthetic fibers|ATA58/2015A| AT517020B1|2015-02-06|2015-02-06|Recycling of cellulosic synthetic fibers|
    JP2017541670A| JP6629869B2|2015-02-06|2016-02-03|Reuse of artificial cellulosic fibers|
    PCT/AT2016/000006| WO2016123643A1|2015-02-06|2016-02-03|Recycling of man-made cellulosic fibers|
    TW105103616A| TWI690547B|2015-02-06|2016-02-03|Recycling of man-made cellulosic fibers|
    ES16709673T| ES2710616T3|2015-02-06|2016-02-03|Recycling of man-made cellulose fibers|
    US15/545,899| US10370778B2|2015-02-06|2016-02-03|Recycling of man-made cellulosic fibers|
    TR2018/20518T| TR201820518T4|2015-02-06|2016-02-03|Recovery of man-made cellulosic fibers.|
    CN201680008196.6A| CN107208325B|2015-02-06|2016-02-03|Recovery of man-made cellulose fibres|
    EP16709673.4A| EP3253912B1|2015-02-06|2016-02-03|Recycling of man-made cellulosic fibers|
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