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1. 发明授权

US5776362A Sludge dehydrating agent 失效
标题翻译：污泥脱水剂
公开(公告)号：US5776362A
公开(公告)日：1998-07-07
申请号：US290986
申请日：1994-08-23
申请人： Shigeru Sato , Hisao Ohshimizu , Shinobu Kawaguchi
发明人： Shigeru Sato , Hisao Ohshimizu , Shinobu Kawaguchi
IPC分类号： B01D21/01 , C02F11/12 , C02F11/14
CPC分类号： C02F11/14 , B01D21/01 , B01D21/245 , C02F11/12
摘要： A sludge dehydrating agent which is excellent in storage stability and prevented from becoming water-insoluble during storage and hence can be distributed in the market securely by solving the problem of the conventional dehydrating agents comprising amphoteric polymers that they undergo deterioration and become water-insoluble when stored for long, thus becoming substantially unusable. This dehydrating agent comprises a copolymer composed of cationic vinyl monomer units, vinylic carboxylic acid monomer units and nonionic vinyl monomer units and a salt of a group IIA metal of the periodic table. Preferable examples of the vinylic carboxylic acid monomer include acrylic, methacrylic and crotonic acids, while those of the nonionic vinyl monomer include acrylamide and methacrylamide. The metal salts usable herein include those of mineral acids and organic carboxylic acids, and preferable mineral acid salts include calcium chloride, magnesium chloride and magnesium sulfate. Preferably, the amount of the cationic vinyl monomer ranges from 10 to 60 mole %, while that of the vinylic carboxylic acid monomer from 10 to 45 mole %. Preferably, the molar ratio of the cationic vinyl monomer to the vinylic carboxylic acid monomer ranges from 0.3 to 3.0, while that of the metal salt to the carboxylic acid monomer from 0.2 to 2.0. The dehydrating agent may further contain an inorganic coagulant.
摘要翻译： PCT No.PCT / JP93 / 00904 Sec。 371日期：1994年8月23日 102（e）日期1994年8月23日PCT提交1993年6月30日PCT公布。出版物WO94 / 01370 日期1994年1月20日一种污泥脱水剂，其储存稳定性优异，防止在贮存期间变得不溶于水，因此可以通过解决常规的脱水剂的问题来解决其经历劣化的两性聚合物的问题，长时间储存时变得不溶于水，因此基本上不能使用。该脱水剂包括由阳离子乙烯基单体单元，乙烯基羧酸单体单元和非离子乙烯基单体单元以及周期表的IIA族金属的盐组成的共聚物。乙烯基羧酸单体的优选实例包括丙烯酸，甲基丙烯酸和巴豆酸，而非离子乙烯基单体的优选实例包括丙烯酰胺和甲基丙烯酰胺。可用的金属盐包括无机酸和有机羧酸的金属盐，优选的无机酸盐包括氯化钙，氯化镁和硫酸镁。优选地，阳离子乙烯基单体的量为10至60摩尔％，而乙烯基羧酸单体的量为10至45摩尔％。优选地，阳离子乙烯基单体与乙烯基羧酸单体的摩尔比为0.3-3.0，而金属盐对羧酸单体的摩尔比为0.2-2.0。脱水剂还可以含有无机凝结剂。

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