Process for the manufacture of a composite plasma membrane and use thereof

US5558776A · kind A · utility

Assignee

• Deutsche Carbone AG · DE

Inventors

• Hermann Steinhauser · Riegelsberg, DE
• Hartmut Bruschke · Schallstadt, DE
• Guido Ellinghorst · Overath, DE
• Andreas Hübner · Unna, DE

Key dates

• Filing date: Oct 17, 1994
• Grant date: Sep 24, 1996
• Expiry date: Oct 17, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C29/76
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Process for the manufacture of composite plasma membranes with the production of a pore-free impermeable polymer layer on a porous substrate through the plasma polymerization of a gaseous mixture, said gaseous mixture containing a hydrocarbon as the matrix-forming component and a nitrogen-, silicon-, sulphur- or phosphorus-containing inorganic compound as the non-matrix-forming component and an oxygen-containing compound, by means of glow discharge in an electrical alternating field. The pore-free impermeable polymer layer is produced directly on a porous substrate without the use of an impermeable intermediate layer, said porous substrate having a pore diameter of less than 100 nm on the side facing the pore-free polymer layer. The composite plasma membranes are used for separating C.sub.1 -C.sub.3 alkanols from mixtures thereof with other organic liquids using the method of pervaporation.