Study on the integrated membrane processes of dehumidification of compressed air and vapor permeation processes

Blend modified polyimide (PI) hollow fiber membranes were used in vapor per meation for gas phase dehydration of ethanol. Dry air sweeping operation wa s used and the dry air was supplied by a dehumidification membrane module o f compressed air. An integrated membrane process was composed. The effects of some factors, such as the modification of membrane materials, the humidi ty and current velocity of sweeping air, the operation temperature, on the efficiency of dehydration were discussed. (C) 2002 Elsevier Science B.V. Al l rights reserved.