Application and development of synthetic polymer membranes. VI. Pervaporation of aqueous ethanol solution through quaternized poly[3‐(N′,N′‐dimethyl) aminopropylacrylamide‐co‐acrylonitrile] membranes

Abstract

SYNOPSISMembranes obtained from polymers, quaternized poly [ 3-(N',N'-dimethyl) aminopropylacrylamide-co-acrylonitrile] s, showed selective separation of water from aqueous ethanol solution by pervaporation. The separation factor toward water reached over 15,000. Membrane performance showed a good correlation to membrane polarity. Differential scanning calorimetric melting endotherms of the water-swollen membranes were studied to clarify the state of water in the membranes. The results suggested that there are two states of water in the membrane: bound and free. The higher the fraction of bound water in the membrane, clearly, the more preferentially was water permeated.

Vapor permeation of aqueous 2-propanol solutions through gelatin/Torlon® poly(amide imide) blended membranes

“…It has been reported that the state of permeant, which is preferentially permeated through a given polymeric membrane, is different from that of bulk permeant; in other words, melting point depression of such a permeant in the membrane is observed in reverse osmosis [12][13][14][15][16][17][18] and pervaporation [19][20][21][22]. The existence of bound water in gelatin was confirmed by 1 H NMR [23] and by thermal analyses [24].…”

Separation of endocrine disruptors from aqueous solutions by pervaporation: Dioctylphthalate and butylated hydroxytoluene in mineral water

“…The pervaporation process has been successfully used in the dehydration of alcohols,8, 9 as well as in the removal of dissolved volatile organic compounds from water 10–19. Böddeker and co‐workers investigated the removal of low‐volatility aromatic hydrocarbons [i.e., thymole (MW = 150.2 g/mol) and vanillin (MW = 152.2 g/mol)] from dilute aqueous solutions through polyether‐ block ‐polyamide membranes by pervaporation 11, 12.…”