• 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:
    In this process, lignin substances are extracted from cellulosic vegetable material at elevated temperature, in particular at 170 DEG C to 210 DEG C, and under an elevated pressure by means of aqueous organic solvents, and the pulp is bleached, if desired. In order to obtain, with exclusive use of solvents which are recoverable by distillation, a pulp which, after a conventional bleach, can be processed further to give a readily filterable viscose, the extraction is carried out in at least two stages, the raw pulp arising after the first extraction stage being re-extracted in a further extraction stage with a medium, which has a swelling action on pulp and dissolves lignin or lignin constituents, from the group comprising dimethylformamide, dimethyl sulphoxide, phenol, dioxane, methanol/benzene, ethanol/benzene, ethanol/ammonia, phenol/water or mixtures thereof, at a lower temperature than in the first extraction stage.
    公开号:SU1296014A3
    申请号:SU823478909
    申请日:1982-08-05
    公开日:1987-03-07
    发明作者:Ленц Юрген；Петер Вальтер；Крэссиг Ханс
    申请人:Хемифазер Ленцинг Аг (Фирма)；
    IPC主号:
    专利说明:

    solution of methyl ethyl alcohol at 170-210 С
    The invention relates to methods for producing pulp and can be used in the manufacture of pulp with a low content of lignin,
    The purpose of the invention is to improve the quality of pulp.
    According to the method for producing cellulose, which involves the extraction of cellulose-containing plant material with aqueous or
    and elevated pressure, if necessary, the subsequent stages of delignification in an alkaline medium and bleaching after extraction with an aqueous solution of methyl or ethyl alcohol, are carried out an additional extraction with either dimethylformamide, or dimethylsulfoxide, or water solution of phenol, or a mixture of methyl alcohol and benzene, or a mixture of ethyl alcohol and ammonia, or dioxane, or phenol at 20-110 s. At the same time, additional extraction is carried out at the bath module from 1: 7 to 1:20 for 10-30 minutes.
    After the extraction step, the cellulose may be washed.
    The proposed method allows the use of fresh wood as a raw material to produce such pulp, the Kappa number of which can be reduced to 1-2 when conducting subsequent bleaching under ordinary industrial conditions.
    Example 1. Chips of beech wood are treated in an autoclave under pressure with an aqueous solution of 55% ethanol and for 4.5 hours, extraction is carried out at. During the extraction process, a fresh solution of ethanol is periodically pumped in.
    Samples of the obtained cellulose with a kappa number of 34 are subjected to additional extraction in dimethylformamide for 15 minutes at 20 ° C and a 1:15 bath module. After additional extraction, the kappa number of the obtained cellulose is 20.5. The subsequent stages of delignification and cellulose bleaching are carried out with the following compositions: a mixture of 2% sap liquor and 2.5% hydrogen peroxide; a mixture of 1% soda lye and 1% hydrogen peroxide; 0.5% active chlorine as CaCOCI),
    o
    five
    0
    five
    0
    five
    0
    five
    0
    five
    a mixture of 0.3% sodium hydroxide liquor and 0.3% hydrogen peroxide.
    The bleached pulp has a kappa number of 1.2, the filtration capacity is 290.
    Example 2 Beech wood chips are extracted in the same way as in Example 1, and additional extraction of the obtained cellulose with a kappa number of 41.5 is carried out in dimethyl sulfoxide at 80 ° C and a 1:20 liquid module.
    After additional extraction, the kappa number of the obtained cellulose is 29.
    Example 3. Beech wood chips are extracted in the same manner as in Example 1, and additional extraction of the obtained cellulose with a kappa number of 37.4 is carried out in medium at 1 for 15 minutes.
    After additional extraction, the kappa number of the obtained cellulose is 22.1.
    Example 4 (control). Chips of beech are extracted as in Example 1 (Kappa number of the obtained cellulose is 34),
    Further refining is carried out by bleaching under severe conditions: delignification, and with a mixture consisting of 3% soda liquor and 3% hydrogen peroxide; delignification with a mixture consisting of 3% soda lye and 1% hydrogen peroxide; bleaching with calcium hypochlorite with an active chlorine content of 0.5%; bleaching blend of 0.3% soda lye and 0.3% hydrogen peroxide.
    The kappa number of such cellulose is 2.4, however, the filtration capacity of cellulose is low (31).
    Example 5, Beech chips are extracted in the same way as in Example 1, and additional extraction of the obtained cellulose with a kappa number of 37.4 is carried out in an aqueous solution of phenol at 80 ° C for 10 minutes.
    After additional extraction, the kappa number of the obtained cellulose is 21.6.
    Example 6. Chips of beech are extracted analogously to example 1, and the additional extraction of the obtained cellulose with a number. Kappa 37.4 is carried out in an aqueous solution of the mixture
    ethyl alcohol and ammonia at 20 ° C for 10 minutes.
    After additional extraction, the kappa number of the obtained cellulose is 23.8.
    Example 7. Chips of beech are extracted analogously to example 1, but using methyl alcohol, and additional extraction of the obtained cellulose with a kappa number of 37.4 in dioxane medium at 10 minutes.
    performed at 20 ° C for
    After additional extraction, the kappa number of the obtained cellulose is 19.2.
    Example 8. Beech chips are extracted in the same way as in Example 1, and additional extraction of the obtained cellulose with a Kappa number of 1.5 is carried out with an aqueous mixture of methyl alcohol and benzene.
    After additional extraction, the kappa number of the obtained cellulose is 30.
    The resulting pulp has improved quality indicators.
    Editor N. Dumbass
    Compiled by A, Monosov Tehred L. Serdyukova
    Order 632/64. Circulation 341.
    VNIIPI USSR State Committee
    for inventions and discoveries 113035, Moscow, Zh-35, Raushsk at 6., d. 4/5
    Production and printing company, Uzhgorod, st. Project, 4
    five

    ten

    2960144
    权利要求:
    Claims (3)
    [1]
    1. Method of producing pulp
    low lignin content, including the extraction of cellulose containing plant material with an aqueous solution of methyl or ethyl alcohol at a temperature of 170-210 ° C and elevated pressure and, if necessary, subsequent delignification stages in an alkaline medium and bleaching, characterized in that after the extraction with the aqueous solution of methyl or ethyl alcohol, the additional quality of the cellulose is carried out by additional extraction with either dimethylformamide, or dimethyl sulfoxide, or an aqueous solution of phenol, or mixture methyl alcohol II benzene, or a mixture of ethyl alcohol and ammonia, or dioxane, or phenol at a temperature of 20-110 ° C.
    [2]
    2. The method according to claim 1, wherein the extraction is carried out for 10-30 wn.
    [3]
    3. The method according to claim 1, wherein the additional extraction is carried out at. Bath module from 1: 7 to 1:20.
    f5
    20
    25
    thirty
    Proofreader E. Roshko
    Subscription
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1194282A3|1985-11-23|Method of decomposing lignocellulose material
    US7842161B2|2010-11-30|Pre-extraction and solvent pulping of lignocellulosic material
    JP2709192B2|1998-02-04|Method for producing cellulose by sodium-anthraquinone method with recovery of cooking chemicals
    JP5712754B2|2015-05-07|Method for producing dissolving pulp
    CN1352716A|2002-06-05|Method for separating lignocellulose-containing biomass
    US2308564A|1943-01-19|Recovery of cellulose and lignin from wood
    SU1296014A3|1987-03-07|Method for producing cellulose with low content of lignin
    RU2037594C1|1995-06-19|Method for producing cellulose
    US1880043A|1932-09-27|Production of high grade chemical pulps
    US2625474A|1953-01-13|Acid-alkali process for the preparation of cellulose fibers
    US2380706A|1945-07-31|Production of refined wood pulp
    RU2068904C1|1996-11-10|Method of producing cellulose
    US2061616A|1936-11-24|Production of cellulose
    US2118074A|1938-05-24|Manufacture of cellulose
    RU2135665C1|1999-08-27|Pulp preparation method
    SU1730299A1|1992-04-30|Method of producing cellulose for chemical processing
    DE4107357C1|1992-11-05|
    KR100538083B1|2005-12-22|Oxygen delignification of lignocellulosic material
    US2118039A|1938-05-24|Manufacture of cellulose
    SU1509468A1|1989-09-23|Method of refining pulp
    US2992155A|1961-07-11|Process for manufacturing rayon pulp of high purity from bagasse
    US5605604A|1997-02-25|Method of reducing the resin content in sulfite pulp
    US2592746A|1952-04-15|Process of making alkali cellulose
    KR101139383B1|2012-04-27|A pulping process for Hangi manufacturing
    SU1141128A1|1985-02-23|Pulp bleaching process
    同族专利:
    公开号 | 公开日
    ATA346581A|1983-05-15|
    JPS5836289A|1983-03-03|
    AT373303B|1984-01-10|
    SE8204379L|1983-02-07|
    CA1188686A|1985-06-11|
    SE8204379D0|1982-07-19|
    DE3227843A1|1983-02-24|
    DE3227843C2|1989-10-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CA238294A|1924-03-04|William Waggett Frederick|Pianoforte action|
    US3585104A|1968-07-29|1971-06-15|Theodor N Kleinert|Organosolv pulping and recovery process|
    DE2644155C2|1976-09-30|1978-07-27|Theodor N. Dr. Pointe Claire Quebec Kleinert |Continuous digestion and recovery process for vegetable fiber raw materials for the production of cellulose in organic solvents|
    DE2803465A1|1978-01-27|1979-08-02|Hans Dipl Ing Knauth|Pulp prodn. from plant fibre raw materials - by hydrolysis to extract hemi-cellulose before decomposition with solvent and lignin dissolution|
    DE2855052A1|1978-12-20|1980-06-26|Nicolaus Md Papier|METHOD AND DEVICE FOR CONTINUOUSLY UNLOCKING PLANT FIBER MATERIAL|JPS60107726U|1983-12-27|1985-07-22|
    JPS62223385A|1986-03-18|1987-10-01|Nippon Kami Pulp Kenkyusho|Production of pulp|
    CA2053035C|1990-10-12|1997-09-30|Repap Enterprises Inc.|Chlorine-free wood pulps and process of making|
    US5252183A|1991-09-13|1993-10-12|Abb Lummus Crest Inc.|Process of pulping and bleaching fibrous plant material with tert-butyl alcohol and tert-butyl peroxide|
    FI103588B|1996-01-19|1999-07-30|Esa Rousu Consulting Oy|A process for the production of raw materials for artificial and other fibers from herbaceous plants|
    CN1297085A|1999-11-19|2001-05-30|普拉塞尔技术有限公司|Method for use of activated ozone in bleaching paper pulp|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    AT346581A|AT373303B|1981-08-06|1981-08-06|METHOD FOR THE PRODUCTION OF LOW-LEVEL CELLS|
    [返回顶部]