Preparation and application of thermal stable poly(phthalazinone ether amide) ultrafiltration membrane

Thermal stable poly(phthalazinone ether amide)(PPEA) ultrafiltration membrane was prepared through phase inversion method using N,N-dimethylacetamide(DMAc) as solvent.The effects of additives,evaporation time and coagulant bath temperature on the performance of ultrafiltration membranes were studied.PPEA UF membrane was applied in the desalination-concentration experiment for the raw products of four newly synthesized dyes.The experiments were effectively accomplished at 0.3MPa,80℃.The membrane exhibited good thermal stability in the experiment.After 6 hours of desalination-concentration experiment,the rejection for dyes was constant and kept at 100%.The initial flux of the fifth round was about 260L/(m2·h),which is 10L/(m2·h) lower than that of the first round.