Method for production of sodium bicarbonate, sodium carbonate and ammonium sulfate from sodium sulfate

Abstract From the Canadian patent

The invention provides several processes for generating sodium carbonate compounds and ammonium sulfate in which the compounds are in a commercially viable and substantially pure form. In one embodiment the process involves , salting out sodium compounds in order to arrive at a high purity ammonium sulfate fertilizer. Several different processes are disclosed which include sodium ion reduction by ion exchange, refrigeration ammonia shifting and , evaporation. The processes disclosed also relate to adaptation of the processes to flue gas desulfurization and gypsum production. The processes disclosed herein result in the production of ammonium sulfate in a purity previously …