PRODUCTION OF ALKALI METAL CARBONATES

摘要

PCT No. PCT/GB92/02184 Sec. 371 Date May 26, 1994 Sec. 102(e) Date May 26, 1994 PCT Filed Nov. 25, 1992 PCT Pub. No. WO93/11071 PCT Pub. Date Jun. 10, 1993A method of producing an alkali metal carbonate, e.g. sodium carbonate, comprises passing a solution or suspension of the alkali metal chloride and bicarbonate over an ion exchange resin which is chloride retaining and has a basicity greater than that of the bicarbonate ion. The product is an aqueous or suspension of the alkali metal carbonate. In the case where the alkali metal is sodium, the product may be used for brine purification in a conventionl Ammonia Soda process.