Method for the production of potassium sulfate using sulfuric acid and potassium chloride
US4588573A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1984 |
| Grant date | May 13, 1986 |
| Priority date | — |
| Expiry date | Apr 19, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05D1/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Potassium chloride and sulfuric acid are reacted in a recycled aqueous solution in the stoichiometric ratio required for potassium sulfate production. Hydrogen chloride produced by the reaction of the potassium chloride and sulfuric acid is evaporated in admixture with water or in anhdrous form. The resulting solution is cooled to crystallize a potassium sulfate salt, preferably potassium bisulfate. The potassium sulfate salt is separated from the mother liquor and the mother liquor is recycled to the reaction step. The potassium sulfate salt is dissolved in an aqueous solution and sequentially decomposed to produce potassium sulfate and a mother liquor rich in sulfuric acid. The mother liquor rich in sulfuric acid is concentrated and recycled to the reaction step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.