REVERSE OSMOSIS ANISOTROPIC MEMBRANES WITH GREAT WATER FLOW AND STRONG SALINE REJECTION,BASED ON POLYPIPERAZINE AMIDES,AND PROCESS FOR PREPARING SUCH MEMBRANES

摘要

1402247 Polypiperazine-amide membranes MONTECATINI EDISON SpA 14 Jan 1974 [16 Jan 1973] 1761/74 Heading C3R [Also in Division B5] Polypiperazine amides (I) have the formula (where n is a whole number sufficiently high to impart to the polymer a molecular weight suitable for the formation of a membrane; the groups -P- are residues (II) x = 0 or 1-8 and R is a substituent group; the groups -K- are divalent organic radicals having formulµ selected from at least two of the Formulµ (III) to (V) and Y is O or S, at least 5 mole per cent of -K- groups having Formulµ (III)). In examples trans-2,5-dimethylpiperazine is reacted with 1,2,5-thiadiazol-3,4-dicarboxylic acid dichloride and isophthaloyldichloride in molar ratios 80/20 and 50/50 or 1,2,5-thiadiazol - 3,4 - dicarboxylic acid dichloride and orthophthaloyl dichloride in a molar ratio of 70/30.