Patent ID: 6740143
Filing Date: 2004-05-25
Classification: B01D,Y10S

Abstract:
A process for making a supported thin film nanopourous carbon membrane, having additive intermixed therein, comprising:(a) coating a porous substrate with one or more layers of polymer intermixed with additive or a polymer alone, wherein at least one of the layers consists of polymer intermixed with additive, wherein the polymer or polymer intermixed with additive mixture is optionally dissolved in a solvent; (b) drying the polymer coating by evaporating any solvent that may be present; (c) then pyrolyzing the polymer or polymer mixture on the porous substrate so as to form a thin mixed matrix carbon film with pores for separation of small molecules; and, optionally, (d) repeating steps (a), (b) and (c) one or more times; wherein the polymer is selected from the group consisting of poly(furfuryl) alcohol, poly(vinyl chloride) and poly(acrylonitrile) and wherein the additive is selected from the group consisting of titanium dioxide, small pore high silica zeolites, and poly(ethylene glycol).