Bulk chemicals industry:Membrane separation rocesses in the bulk chemicals industry

摘要

The membrane separation processes to be considered here include the familiar liquid processes;reverse osmosis,nanofiltration,ultrafiltration and microfiltration,but also include the less familiar fluid separation processes of pervaporation,gas/gas separation (or gas permeation),vapour permeation and electrodialysis.A key feature of the bulk chemical sector is that all these membrane separation processes can be found in it,with,for example,the separation of air into its component gases,or the dehydration of ethanol/water azeotropes,or the recovery of hydrogen from cracker gases being as important to their industrial sub-sectors as ultrafiltration or microfiltration are in theirs.