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US 4,755,299 AGranted
Multi-layer membrane and the use thereof for the separation of liquid mixtures according to the pervaporation process
AssigneeGFT Ingenieurburo Fur Industrieanlagenbau
InventorHartmut Bruschke
Life of this patent
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Abstract
A multi-layer membrane having a porous backing layer of polyacrylonitrile, polysulfone or the like, and an active separating layer of polyvinyl alcohol or cellulose acetate. The membrane is particularly suitable for the separation of water-alcohol mixtures according to the pervaporation process.
Claims7
A process for separating a liquid mixture into separable components comprising said mixture, comprising the steps of:
- (a) delivering said liquid mixture to a first free surface of a composite membrane consisting essentially of (1) a non-porous layer useful for separating an aqueous liquid mixture comprising at least one organic liquid, said non-porous layer being comprised of a first polymer, and (2) at least one porous backing layer comprised of a second polymer, wherein said first polymer is cross-linked polyvinyl alcohol;
- and
- (b) applying a vaccum to, or an inert gas stream over, a second free surface of said composite membrane, such that said components of said liquid mixture are separated across said composite membrane by pervaporation.
Dependencies are inferred from the claim text.