Concentration history of pervaporation

被引：3

作者：

Ageev, E. P. ^{[1
]}

Matushkina, N. N. ^{[1
]}

Strusovskaya, N. L. ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Fac Chem, Moscow 119991, Russia

来源：

PETROLEUM CHEMISTRY | 2013年 / 53卷 / 08期

关键词：

separation processes; selective flux; target component; transport channels;

D O I：

10.1134/S0965544113080021

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

The permeability and selectivity of the separation of aqueous organic solutions by pervaporation have been studied on semicrystalline poly(ethylene terephthalate) membranes and asymmetric amorphous polyvinyltrimethylsilane membranes in the presence of structural rearrangements initiated by the development of relaxation processes. Attention was focused on the concentration history, which lies in the fact that the permeability and the permeate composition depend on the concentration of the previous solution passed through the membrane at a fixed composition of the feed solution. It has been shown that micropores are formed in both membranes under certain pervaporation conditions and mass transfer occurrs through two competing transport channels. As a result, the oscillatory kinetics of pervaporation and the inversion of separation selectivity in a steady state are observed experimentally.

引用

页码：567 / 571

页数：5