| 摘要 |
<p>1380807 Flocculating LUBRIZOL CORP 8 Feb 1972 [12 Feb 1971] 5862/72 Heading C1C Solids in aqueous suspension (e.g. kaolin suspensions or sewage) are flocculated by adding thereto a water-soluble polymer or copolymer containing units of the formula wherein R = H, lower (up to 7 C atoms) alkyl or substituted lower alkyl, R<SP>3</SP> = H or lower alkyl ; R<SP>4</SP> = lower alkyl; M = H or one equivalent of a cation (e.g. Na, K, NH 4 ). An inorganic flocculant, e.g. Fe 2 (SO 4 ) 3 , Al 2 (SO 4 ) 3 or Ca(OH) 2 may be added. The copolymer may comprise acrylic acid, methacrylic acid, methacrylamide, N- methylacrylamide, or N-(1,1-dimethyl-3-dimethylaminobutyl) acrylamide. The copolymer may be quaternized. The substituted radical may include halide, hydroxy, alkoxy, keto, carboxy, carbalkoxy, amide, amino, nitro, cyano, hydrocarbylthio, sulphoxy, sulphone and sulphonic acid and amide groups.</p> |
