Method of producing alkali metal phosphate
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United States of America Patent
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Aug 22, 1995
Issued Date -
N/A
app pub date -
Dec 12, 1994
filing date -
Apr 6, 1990
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Expired
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Abstract
The invention relates to a method for producing alkali metal phosphate, in particular monopotassium phosphate or its aqueous solution, by reacting fertilizer-grade phosphoric acid with alkali metal chloride at 350.degree. . . . 700.degree. C. to produce alkali metal metaphosphate, hydrolyzing thus obtained solid reaction product, removing the insoluble residue containing impurities from the hydrolysis solution in order to achieve a pure solution of alkali metal phosphate, and if further desired, crystallizing and separating the alkali metal phosphate from said aqueous solution.
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