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Aromatic polyamide–hydrazides for water desalination. I. Syntheses and RO membrane performance
Author(s) -
Satre M. D.,
Ghatge N. D.,
Ramani M. P. S.
Publication year - 1990
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1990.070410319
Subject(s) - membrane , polyamide , reverse osmosis , aqueous solution , chloride , desalination , polymer chemistry , chemistry , condensation polymer , sodium , nuclear chemistry , polymer , acetamide , casting , chemical engineering , lithium chloride , materials science , organic chemistry , composite material , biochemistry , engineering
Wholly aromatic polyamide–hydrazides (PAH) were synthesized by low‐temperature solution polycondensation of m ‐amino benzhydrazide (MABH)/ p ‐amino benzhydrazide (PABH) with isophthaloyl chloride (ICL)/terephthaloylchloride (TCl) in N,N ‐dimethyl acetamide (DMAC)/ N ‐methyl‐2‐pyrrolidone (NMP). The polymers were characterized for their properties. Membranes were prepared from these (PAH) polymers under different casting conditions by varying the casting solution composition, evaporation time, post‐annealing treatment, etc. The reverse osmosis (RO) tests for these membranes were performed with 5000 ppm aqueous sodium chloride feeds at 40 and 70 kg/cm 2 operating pressures. Addition of lithium chloride to casting solutions and annealing in hot water conferred optimum selectivity to RO membranes. Membranes showed rejections up to 98.5% at flux > 20 cm/day.