EC-HBPE渗透汽化膜的性能

The Pervaporation Performance of EC-HBPE Membrane

以三羟甲基丙烷为核、二羟甲基丙酸为单体,采用准一步法合成了1～5代脂肪族超支化聚酯（HBPE）。将该聚酯与乙基纤维素（EC）共混制备了EC-HBPE均质膜,以苯/环己烷体系为对象,对该共混膜的溶胀行为和渗透汽化性能进行了考察。结果表明,适量3、4、5代HBPE的加入可以在不降低膜分离因子的同时,大幅度提高膜的通量。在苯含量较低（〈10%）的料液中,EC-HBPE的吸附选择性略高于EC,而EC-HBPE液的平衡吸附量明显高于EC。

An aliphatic type of Hyperbranched Polyester （HBPE） was synthesized from 2, 2- dihydroxymethyl propanyl acid （DMPA） and 1,1,1-trihydroxymethyl propane （TMP） via Pseudo- One-Step method, and employed to improve the pervaporation properties of Ethyl Cellulose （EC） membrane on Benzene/Cyclohexane separation. The permeate flux of membrane was enhanced greatly with the similar separation factor, when moderate amount of HBPE was added into EC membrane. The sorption properties of EC-HBPE and EC membranes were investigated. The results indicate that, the sorption selectivity of EC membrane dosn＇t changed significantly, but the sorption amount at equilibrium for EC-HBPE is elevated in the case of the content of G4HBPE in EC is 20% （mass fraction）, and all membranes show more preferential toward Benzene than Cyclohexane. The total permeate flux of EC-G4HBPE membrane increases from 14 kg/um·m^2·h of EC to 34 kg/um·m^2·h, and the separation factor from 3.25 of EC to 3.73 for a binary mixture containing 10 % Benzene at 40℃