• 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:
    1414918 Sequestering agents CIBA-GEIGY (UK) Ltd 4 Feb 1974 [14 Feb 1973] 7181/73 Heading C1C [Also in Division C7] Water is treated to inhibit scale deposition by addition thereto of a hydrolysed copolymer of maleic anhydride with a mono-ethylenically unsaturated monomer or monomer mixture, the molar ratio maleic anhydride : other monomers being from 2À5 : 1 to 100 : 1 and the copolymer M.W. being up to 1000. Said monomer may be acrylic acid, methacrylic acid, crotonic acid, itaconic acid, aconitic acid (esters), itaconic anhydride ethyl acrylate, methyl methacrylate, acrylonitrile, acrylamide, vinyl acetate, styrene, α-methyl styrene, methyl vinyl ketone, acrolein, ethylene, and/or propylene. The polymer may be hydrolyzed by water, acid or alkali; 0À1- 100 p.p.m. is added to water in a boiler or seawater evaporator, e.g. of metal such as A1 or brass. A dispersing or threshold agent may be added, e.g. polyacrylic acid (salt), hydrolysed polyacrylonitrile, polymethacrylic acid, polyacrylamide or its acrylic or methacrylic copolymers, lignin sulphonic acid, tannin, naphthalene sulphonic acid/HCHO, starch, or carboxymethylcellulose, polymaleic acid, alkyl- or amino alkyl-phosphonic acid or alkali metal phosphate. There may also be added a precipitating agent, e.g. alkali metal orthophosphate, carbonate, hydroxide, oxygen-scavengers. such as a.m. sulphite or N 2 H 4 , sequestering agents such as NTA or EDTA, corrosion inhibitors such as cyclohexylamine, morpholine, distearylamine/ethylene oxide, stearylamine, Na 2 SO 4 , MgSO 4 , or antifoaming agents, e.g. distearyl sebacamide, or adipamide, fatty alcohols or their ethylene oxide condensates.
    公开号:SU730293A3
    申请号:SU741995597
    申请日:1974-02-13
    公开日:1980-04-25
    发明作者:Айвэр Джоунс Томас；Грехем Джоффри；Энтони Файнэн Майкл
    申请人:Циба-Гейги Аг (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a method of softening water and can be used in water treatment, circulating water supply systems with the ability to prevent the formation of 5 hardness salts on surfaces, heat exchange equipment, and also to protect surfaces from rust at room temperatures.
    There is a method of softening Pu-Yu water by treating it with maleic anhydride copolymers and other molecular weight monomers of about 1000-40000 [1].
    The disadvantage of this method is the low degree of prevention of scale formation on the surfaces of heat exchange equipment.
    Closest to the proposed invention is a method of water softening ® by treating it with hydrolyzed copolymers of maleic acid anhydride and other monoethylene compounds in a molar ratio of 1: 2-2: 1 [2]. 28
    The disadvantage of this method is the low degree of prevention of scale formation, determined by the initiation time and the rate of precipitation of hardness salts (CaCO ^ and *
    SaBOC), which respectively make (with the introduction of the copolymer at a concentration of 10 h / mpn) 1 min and 8-6 g / cm · ® (according to CaCOj) and 5-3 min and 30 g / cm3 (according to CaSOq).
    The purpose of the invention is to increase the degree of prevention of scale formation.
    This is achieved by the fact that the copolymerization product of maleic anhydride, vinyl acetate, and ethyl acrylate is used as the copolymer.
    The molar ratio of maleic anhydride, vinyl acetate and ethyl acrylate is 6: 1: 1-9: 2: 1, respectively, and the copolymerization product is introduced in an amount of 1-100 ppm.
    The resulting copolymer can be hydrolyzed before using it for water treatment.
    When m. In a 100 cm 3 aqueous solution containing 1.47 g / l Ca (NO 3 ) g 4 4 NdO, a scale inhibitor, in particular a ternary copolymer of maleic acid anhydride, vinyl acetate and ethyl acrylate, is introduced in a molar ratio of 6: 1: 13-9 : 2: 1. The concentration of the solid copolymer was 10 ppm.
    100 cm of an aqueous solution containing 0.646 g / l Sodium carbonate was added to the mixture, and the mixture was heated to 90 * 0.
    The heated solution is passed through a colorimeter and the absorbance is measured. According to the time of the latter, two quantities are determined:
    a) initiation time - the time from the moment of mixing the two solutions (Mixtures with an inhibitor and sodium carbonate) to the deposition of hardness salts;
    b) the rate of deposition of hardness salts.
    An increase in the initiation time or a decrease in the deposition rate in the presence of the test additive indicates the inhibitory effect of the inhibitor from scale formation on the deposition of hardness salts.
    The initiation time and the deposition rate under these conditions are 3-5 min and 0.5-1.9 g / cm 2 (for CaCO 9 ) and 8-10 min and 2-4 g / cm 3 (for CaSO A ), respectively.
    With the introduction of a hydrolyzed copolymer at a concentration of 1-100 ppm, the initiation time and deposition rate do not go beyond the indicated limits.
    权利要求:
    Claims (2)
    [1]
    The invention relates to a method of water softening and can be used in water treatment, circulating water supply systems with the possibility of preventing the formation of hardness salts on surfaces, heat exchangers, and also to protect surfaces from rust at room temperature. There is a known method of water softening by treating it with copolymers of anhydride d maleic acid and other molecular weight monomers of about 1000-40000 1. The disadvantage of this method is the low degree of preventing scale formation on the surfaces of heat exchange equipment. The closest to the proposed invention is the method of water softening by treating it with hydrolyzed copolymer or from maleic anhydride and other monoethylene compounds at a molar ratio of 1: 2-2: 1 2. The disadvantage of this method is a low degree of prevention of scale formation, with initiation time and sedimentation rate of hardness salts (CaCOj and Ca5 Oz), which respectively (with the introduction of a copolymer at a concentration of 10 ppm) for 1 min and 8-6 g / cm 3 (for CaCO3) and 5-3 min and 30 g / cm 3 (according to SAZOTs). The purpose of the invention is to increase the degree of scale formation prevention. This is achieved by using as the copolymer a copolymerization product from anhydrous and maleic acid, vinyl acetate and ethyl acrylate. In this case, the molar ratio of maleic anhydride, vinyl chloride and ethyl acrylate is 6: 1: 1-9: 2: 1, respectively, and the copolymerization product is introduced in an amount of I-IOO ppm. The resulting copolymer can be hydrolyzed before it is used to treat water., At p. In 100 cm of an aqueous solution containing 1.47 g / l of CaCNOj) 4HdOg, a scale formation inhibitor is introduced, in particular, a ternary copolymer of maleic acid anhydride, vinyl acetate and ethyl acrylate at a molar ratio of 6: 1: 1-9: 2: 1 The concentration of solid copolymer was 10 ppm. To the mixture is added 100 cm of an aqueous solution containing 0.646 g / l of sodium carbonate, and the mixture is heated to. The heated solution is passed through a colorimeter and the optical density is measured. Two values are determined from the time of the latter: a) initiation time — the time from the moment of mixing two solutions (Mixture with inhibitor and sodium carbonate) to the precipitation of hardness salts b) the rate of precipitation of hardness salts. An increase in the time of initiation or a decrease in the deposition rate in the presence of the tested additive indicates the inhibitory effect of the inhibitor from scale formation to precipitation, hardness salts. The initiation time and deposition rate under the specified conditions are, respectively, 3-5 minutes and 0.5-1.9 g / cm (for CaCO) and 8-10 minutes and 2-4 g / cm (for SASOD). With the introduction of a hydrolyzed copolymer at a concentration of 1-100 h / ml, the initiation time and deposition rates do not go beyond the specified limits. Claim 1. A method of water softening by treating it with a hydrolyzed copolymer, characterized in that, in order to increase the degree of formation prevention, a copolymer is used to produce copolymerisin from maleic anhydride, vinyl acetate and ethyl acrylate as the copolymer, 2. and with the fact that in the copolymerization product the molar ratio of maleic anhydride, vinyl acetate and ethyl acrylate is 6: 1: 19: 2: 1, respectively. 3. The method according to claim 1, characterized in that the copolymerization product is introduced in an amount of 1-100 ppm. Sources of information taken into account in the examination 1. UK Patent No. 772775, cl. 46 C 17.0457.
    [2]
    2. US patent number 2723956, kl.21058, 15.11.55 (prototype).
    类似技术:
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    JP3196031B2|2001-08-06|Aqueous treatment composition
    US7252770B2|2007-08-07|Multifunctional calcium carbonate and calcium phosphate scale inhibitor
    US4126549A|1978-11-21|Treatment of water
    CA1234327A|1988-03-22|Composition and method for inhibiting scale
    BR0208127B1|2012-11-27|method for controlling fouling and deposition formation in aqueous systems.
    US4460477A|1984-07-17|Use of a carboxylic functional polyampholyte to inhibit the precipitation and deposit of scale in aqueous systems
    US4631131A|1986-12-23|Method for inhibiting scale
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    US4581145A|1986-04-08|Composition and method for inhibiting scale
    US5135661A|1992-08-04|Process for treating water or aqueous systems
    JP4146230B2|2008-09-10|Phosphate stabilizing composition
    CA2840781C|2019-07-23|Preparing maleic acid-isoprenol copolymers
    CA1200457A|1986-02-11|Polyitaconic acid threshold scale inhibitor
    US5601754A|1997-02-11|Water treatment polymer containing poly[oxy-[|-1,2-ethanediyl]] macromonomers and methods of use thereof
    IL47088A|1977-12-30|Method and compositions for preventing alkaline scaling
    US4889637A|1989-12-26|Scale control with terpolymers containing vinyl alcohol
    US5032646A|1991-07-16|acrylic acid/itaconic acid copolymers, their preparation and use as antiscalants
    US4204953A|1980-05-27|Process for alkaline scaling
    US5122278A|1992-06-16|Inhibition of deposition in aqueous systems
    US5169537A|1992-12-08|Water soluble terpolymers and methods of use thereof
    同族专利:
    公开号 | 公开日
    SE397954B|1977-11-28|
    DE2405192C2|1986-04-24|
    FR2217274A1|1974-09-06|
    HK26679A|1979-05-04|
    JPS5429998B2|1979-09-27|
    DE2405192A1|1974-08-29|
    NL181865C|1987-11-16|
    JPS5035065A|1975-04-03|
    CY1000A|1979-08-02|
    BR7401045D0|1974-11-05|
    IL44110A|1976-09-30|
    DK146185B|1983-07-18|
    AU6504974A|1975-07-31|
    IT1009636B|1976-12-20|
    IL44110D0|1974-05-16|
    DK146185C|1983-12-12|
    ZA74949B|1975-01-29|
    MTP759B|1975-05-27|
    GB1414918A|1975-11-19|
    NL7401903A|1974-08-16|
    CA1019476A|1977-10-18|
    BE810967A|1974-08-13|
    NL181865B|1987-06-16|
    AR201367A1|1975-03-07|
    PL88620B1|1976-09-30|
    EG11050A|1976-12-31|
    FR2217274B1|1977-06-10|
    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    GB718173A|GB1414918A|1973-02-14|1973-02-14|Treatment of water to prevent the deposition of scale|
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