Patent ID: 6531267
Filing Date: 2003-03-11
Classification: B01J,G03F

Abstract:
A method for producing an acid sensitive liquid composition, said method comprising the step of:passing an acid sensitive liquid composition comprising a carbonate represented by the formula ROC(&boxH;O)OR1 wherein R and R1 independently are a hydrocarbyl group of 1 to about 10 carbon atoms, through at least one of the following two filter sheets: (a) a filter sheet comprising a self-supporting fibrous matrix having immobilized therein a particulate filter aid and a particulate ion exchange resin, said ion exchange resin having an average particle size of from about 2 to about 10 micrometers (&mgr;m), wherein said particulate filter aid and ion exchange resin particles are distributed substantially uniformly throughout a cross-section of said matrix; and/or (b) a filter sheet comprising a self-supporting matrix of fibers having immobilized therein a particulate filter aid and a binder resin, said filter sheet having an average pore size of about 0.0.05 to 0.5 &mgr;m; thereby producing the acid sensitive liquid composition; wherein, the ion exchange resin of filter sheet (a) comprises a cation exchange resin, and wherein the filter sheet (b) does not contain any ion exchange resin.