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公开(公告)号:US4566972A
公开(公告)日:1986-01-28
申请号:US691724
申请日:1985-01-15
CPC分类号: C02F5/12
摘要: A method of inhibiting and preventing scale in an aqueous system is described which comprises incorporating in the water at least one amino carboxylate having the formula:RN[--(CH.sub.2).sub.x --Z].sub.2in which x is 1 or 2, R represents --(CH.sub.2).sub.x --Z or --CH.sub.2 CH.sub.2 N[--(CH.sub.2).sub.x --Z].sub.2 and Z represents a --COOH group, or a salt thereof, and at least one water-soluble copolymer possessing recurring units of the formula: ##STR1## wherein R.sub.1 represents hydrogen, lower alkyl or --CH.sub.2 COOH, R.sub.2 represents hydrogen or lower alkyl, X represents --COOH and Z represents hydrogen or --COOH, or X and Z together represent --CO--O--CO--, and Y represents --SO.sub.3 H, --C.sub.6 H.sub.5 SO.sub.3 H (para) or --CONHQ(R.sub.3)(R.sub.4) SO.sub.3 H in which Q represents --CH.sub.2 -- or --CH.sub.2 --CH.sub.2 -- and R.sub.3 and R.sub.4 independently represent hydrogen, phenyl, substituted phenyl, C 1-12 linear or branched alkyl or C 3-12 cycloalkyl, or a salt thereof.
摘要翻译: 描述了一种抑制和防止水性体系中的结垢的方法,其包括在水中加入至少一种具有下式的RN [ - (CH 2)x Z] 2的氨基羧酸酯,其中x为1或2,R表示 - (CH 2 )xZ或-CH 2 CH 2 N [ - (CH 2)x Z] 2,Z表示-COOH基团或其盐,以及至少一种具有下式的重复单元的水溶性共聚物:其中R 1表示氢,低级 烷基或-CH 2 COOH,R 2表示氢或低级烷基,X表示-COOH,Z表示氢或-COOH,或X和Z表示-CO-O-CO-,Y表示-SO 3 H,-C 6 H 5 SO 3 H(对) 或-CONHQ(R3)(R4)SO3H,其中Q表示-CH2-或-CH2-CH2-,R3和R4独立地表示氢,苯基,取代的苯基,C 1-12直链或支链烷基或C 3-12环烷基 ,或其盐。
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公开(公告)号:US5122278A
公开(公告)日:1992-06-16
申请号:US558925
申请日:1990-07-26
CPC分类号: C02F5/12
摘要: A method for treating an aqueous system is disclosed which comprises incorporating therein a water soluble organic sulphonate copolymer and an optionally N-substituted water soluble copolymer of acrylamide or methacrylamide and a copolymerizable monomer.
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公开(公告)号:US4557896A
公开(公告)日:1985-12-10
申请号:US271872
申请日:1981-06-09
CPC分类号: C23F11/08
摘要: Composition and method for inhibiting corrosion in aqueous systems using synergistic combination of an inorganic nitrite and a phosphonate, e.g., 10-20 ppm sodium nitrite plus 0.5-5 ppm hydroxyethylidene diphosphonic acid.
摘要翻译: 使用无机亚硝酸盐和膦酸盐如10-20ppm亚硝酸钠加0.5-5ppm羟基亚乙基二膦酸的协同组合来抑制含水体系中的腐蚀的组合物和方法。
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公开(公告)号:US4964952A
公开(公告)日:1990-10-23
申请号:US187628
申请日:1988-04-28
CPC分类号: D21H21/02 , D21H17/02 , D21H17/07 , Y10S162/04
摘要: A method of controlling pitch in an aqueous system involved in paper making as described which comprises adding a cationically modified tannin to the system.
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