Co-production of potassium sulfate, sodium sulfate and sodium ch

Details Co-production of potassium sulfate, sodium sulfate and sodium ch Co-production of potassium sulfate, sodium sulfate and sodium ch

1994-11-28

1996-09-03

Langel, Wayne

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkali metal

423552, C01D 500

Patent

active

055521266

ABSTRACT:
A process for producing potassium sulfate, sodium sulfate, and sodium chloride from potash and a sodium sulfate/water source, which includes: (a) treating the sodium sulfate/water source to produce a slurry containing anhydrous sodium sulfate; (b) concentrating the slurry to form a concentrate and a diluent; (c) treating the diluent to precipitate out anhydrous sodium sulfate; (d) subjecting the anhydrous sodium sulfate from steps (b) and/or (c) and/or from a different source to conversion with potash in an aqueous medium to yield glaserite and a first mother liquor, with any excess anhydrous sodium sulfate being taken as co-product; (e) converting the glaserite with potash and water to produce a precipitate of potassium sulfate and a second mother liquor; (f) returning the second mother liquor to step (d); (g) subjecting the first mother liquor to evaporative crystallization such that substantially pure sodium chloride is precipitated in a third mother liquor; and (h) returning the third mother liquor for conversion to potassium salts.

REFERENCES:
patent: 1936070 (1933-11-01), Ritchie et al.
patent: 1990896 (1935-02-01), Connell
patent: 4215100 (1980-07-01), Sokolov et al.
Scherzberg, H.; Schmitz, R. and Wholle, W.; Phosphorus and Potassium No. 178 (1992), 20-26.

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