壳聚糖/羧甲基纤维素聚电解质络合物膜的乙醇/水渗透汽化性能研究

Pervaporation of Ethanol-Water through Polyelectrolyte Complex Membrane of Chitosan-Carboxymethylcellulose

采用壳聚糖和羧甲基纤维素进行聚离子反应．制备聚电解质络合物膜。该膜用于乙醇／水的渗透汽化分离，显示具有优先透水性，在乙醇浓度90％，温度60℃下，渗透通量和分离系数分别达197g／m2·h，1588。随料液乙醇浓度的增加，膜渗透通量下降，而分离系数增加，分离系数在乙醇浓度90％左右有一极大值。随温度升高，膜渗透通量和分离系数同步上升，渗透通量随温度的关系符合Arrhe－nius方程，渗透汽化表现活化能为34kJ／mol。

The poyelectrolyte complex membrane was prepared by polyion interaction between chitosan and carboxymethylcellulose. The membrane was used to seperate ethanol-water mixtures by pervaporation and show highwater permselectivity , the permeation rate and the separation factor were 197g/m2h and 1588 respectively, measuredwith 90% ethanol in feed at 60℃ . The permeation rate decreased and the separation factor increased with increasingthe ethanol concentration in feed , the maximum separation factor appeared at 90% ethanol concentration. Both thepermeation rate and the separation factor increased with increasing the temperature of systern. Relationship of thepermeation rate with the temperature followed Arrhenius equation , the apparent activation energies for permeation wascalculated to be 34kJ/mol.