Patent ID: 8741249

Claim:
A process for producing soda ash from brine waste, utilizing high pressure filtration and ion exchange for regenerating ammonia from a mother liquor generated during production of the soda ash, the process comprising: reacting brine waste with carbon dioxide and ammonia to produce a reaction mixture containing sodium bicarbonate and ammonium chloride; separating the sodium bicarbonate from the reaction mixture to produce a first mother liquor containing ammonium chloride; converting the sodium bicarbonate separated from the reaction mixture to soda ash; filtering the first mother liquor at high pressure to produce purified water and a concentrated ammonium chloride solution; treating the concentrated ammonium chloride solution with a base anion exchange resin for regenerating ammonia suitable for use in reacting the brine waste with carbon dioxide and ammonia; and, using the ammonia regenerated from the concentrated ammonium chloride solution for supplying at least 10% of the ammonia used in reacting the brine waste with carbon dioxide and ammonia to produce the reaction mixture.