PROCESS TO PURIFY AN ALKALINE METAL HALOGENATE PICKLE CONTAINING ALUMINUM AS IMPURITY AND PROCESS TO PURIFY A SODIUM CHLORIDE PICKLE THAT HAS AN INITIAL CONCENTRATION OF ALUMINUM AS IMPURITY

摘要

A process for purifying an alkali metal halide brine containing aluminum as an impurity which comprises adjusting the pH of the alkali metal halide brine to the range of from about 8.5 to about 9.5 and contacting the alkali metal halide brine with an ion exchange resin having a phosphonic acid group. Using the novel process of the present invention, high purity alkali metal halide brines may be produced for use in electrolytic membrane cells which have concentrations of aluminum reduced to a level which will not cause damage to a cation exchange membrane or affect the membranes ability to transport cations or water molecules.