METHOD OF RECOVERING ELECTROCHEMICAL PROPERTIES OF CATION EXCHANGE MEMBRANE OF FLUORINATED POLYMER

摘要

1536262 Ion-exchanger regeneration ASAHI GLASS CO Ltd 2 Nov 1977 45593/77 Heading B1J [Also in Division C7] A spent fluorinated carboxylic-type cation exchange membrane in the alkali or alkaline earth metal salt form is converted to the acid or C 1-5 alkyl ester form and thereafter heattreated for re-use. A membrane from a chloralkali cell may be pulverised before conversion and then melt-pressed into a new membrane in the heating step. Conversion may involve acid treatment optionally in the presence of a polar organic compound and then esterification either direct or via the acid chloride or anhydride form. The membrane may contain reinforcing fibrils based on PTFE.