Patent ID: 6143271
Filing Date: 2000-11-07
Classification: C01D,C05D

Abstract:
A process for producing potassium sulfate from a potash source and a sodium sulfate source, comprising the steps of:(a) treating a portion of the potash source and the sodium sulfate source, such that glaserite is crystallized out of solution by evaporative cystallization or cooling cystallization thereby obviating the need for the production of intermediate sodium sulfate salts, and a first mother liquor is produced;(b) converting the glaserite to precipitate potassium sulfate in a second mother liquor;(c) recycling said second mother liquor to step (a);(d) subjecting said first mother liquor to evaporative crystallization to produce sodium chloride in a third mother liquor; and(e) recycling said third mother liquor to step (a).