Membrane for pervaporation, vapour permeation and gas sepn. - made by compacting porous polymer support layer by chemical or thermal means

摘要

A membrane for pervaporation, vapour permeation and gas sepn. is made by compacting one side of a porous polymer support layer by thermal and/or chemical means to produce a non porous layer effective for sepn. but impermeable convectively. The membrane may be of polyamide, cellulose acetate, polysulphone, polypropylene, etc.. ADVANTAGE - No additional polymer is required.