PERVAPORATION PROCESS WITH REDUCED DRIVING FORCE

摘要

A pervaporation process characterized by a low driving force and low feed/permeate pressure ratio, obtained by operating at permeate pressures above 50 torr (6.7 KPa) or at low feed temperatures. The process is effective in controlling concentration polarization in pervaporation separations of components of high relative volatility, where the evaporative term has a significant effect on the overall separation factor. The process is particularly useful for separating VOCs from water, or for separating organic mixtures.