Co-production of potassium sulfate and sodium sulfate

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

1994-11-28

1996-06-25

Langel, Wayne

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423199, C01D 500

Patent

active

055297641

ABSTRACT:
A process for producing potassium sulfate or potassium sulfate and sodium sulfate from potash and a sodium sulfate/water source, which includes: (a) subjecting a sodium sulfate source to conversion with potash in an aqueous medium to yield glaserite precipitate and a first mother liquor; (b) converting the glaserite precipitate with potash and water to produce a potassium sulfate precipitate and a second mother liquor; (c) returning the second mother liquor to step (a); (d) subjecting the first mother liquor to treatment, such as evaporative crystallization, such that a sodium chloride and sodium sulfate solids mixture or pure sodium chloride is precipitated in a third mother liquor; (e) subjecting the solids from step (d) to a sodium sulfate/water source to produce anhydrous sodium sulfate; and (f) 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 Wholk, W.; Phosphorus and Potassium No. 178 (1992), 20-26.

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