改性聚苯醚膜对有机混合液的渗透汽化分离

Modified Poly(2,6-methyl-p-phenylene oxide)(PPO) Membrane Used for the Pervaporation Separation of the Mixtures of Organic Liquid

研究了溴代ＰＰＯ（简称ＢＰＰＯ）均质膜以各种胺（如氨水、苯胺、四乙烯五胺等）化学交联后对氯代烃如氯仿、氯代苯的水溶液的渗透汽化（ＰＶ）分离性能，以及对甲醇／正戊烷、乙醇／正戊烷等有机液的分离性能。通过和聚乙烯基吡咯烷酮（ＰＶＰ）物理共混，提高ＢＰＰＯ膜的极性以改善对醇类／正戊烷混合液的分离选择性。将氨交联的ＢＰＰＯ形成铵盐酸盐后进一步提高了其均质膜对醇类／正戊烷的分离性能，对于７．０５ｗｔ％的甲醇／正戊烷料液，在３０℃及常压下，α甲醇／正戊烷为４７５，通量高达６８０ｇ／ｍ２·ｈ。

As a good membrane material, bromide PPO(BPPO) was modified by heterogeneous crosslinking reaction with amines, such as aqueous ammonia, aniline and tetraethylenepentamine and so on. And its membrane form, when used in extracting halocarbons, for example, chloroform, benzene chloride from waster water, showed good separation performances. Better results were achieved for the preferential permeation of MeOH or EtOH from their corresponding n-pentane solutions through the blend membrane of BPPO and polyvinylpyrrolidone (PVP), whose polarity is higher than the former. The membrane crosslinked with amine, though showed high flux for separation of MeOH/n-pentane, has poor selectivity of MeOH versus n-pentane. By quaternarization of crosslinked BPPO membrane, the polarity of the membrane improved greatly and it is favorable to concentrate methanol in the permeation side with this membrane. For example, for separating 7.05wt% MeOH/n-pentane mixtures at 30℃ and 1 atm, the selectivity increased to 475 while the value of flux was about 680g/m2.h ideally.