Process for producing potassium sulfate from potash and sodium sulfate
AssigneeDead Sea Works Ltd.
InventorsCurt Holdengraber, Shalom Lampert
Life of this patent
Estimating the term…
Abstract
The present invention provides a process for producing potassium sulfate from a potash and a sodium sulfate source, comprising the steps of: (a) treating a portion of the potash source and sodium sulfate source, such that glaserite is crystallized out of solution and a first mother liquor is produced; (b) converting the glaserite to precipitate potassium sulfate in a second mother liquor; (c) recycling the second mother liquor to the portion of the potash source and sodium sulfate source; (d) subjecting the first mother liquor to evaporative crystallization to produce sodium chloride in a third mother liquor; and (e) recycling the third mother liquor to the portion of the potash source and sodium sulfate source.
Claims17
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).
A process for producing potassium sulfate from a potash source and a sodium sulfate source, consisting essentially of steps:
- (a) treating a portion of the potash source and the sodium sulfate source, such that glaserite is crystallized out of solution 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).
Dependencies are inferred from the claim text.