Production of low-chloride alkali metal phosphates

Chemistry: fertilizers – Processes and products – Inorganic material

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71 35, 423305, 423309, 423313, 423315, C01B 2530, C05B 700

Patent

active

051144603

ABSTRACT:
Potassium phosphate useful as a low-chloride content fertilizer is prepared by reacting phosphoric acid, commercial or technical grade, with fertilizer-grade potassium chloride (Muriate of Potash, 60-63% K.sub.2 O) at a reaction temperature of about 130.degree. C. and a mole ratio of phosphorus to potassium of at least about 1.3:1. The vaporization of hydrogen chloride from the reaction mixture is effected by a novel technique combining air followed by steam stripping. The reaction product is used to produce various types as well as grades of fertilizers. The procedure may be used to form sodium phosphate in analogous manner from sodium chloride, which then may be converted to trisodium phosphate or sodium tripolyphosphate. The potassium phosphate may be converted to potassium pyrophosphate by neutralization with potassium hydroxide followed by calcination.

REFERENCES:
patent: 1805873 (1931-05-01), Kaselitz
patent: 1865968 (1932-07-01), Schuppe
patent: 2064979 (1936-12-01), Kaselitz
patent: 3554729 (1971-01-01), Curless
patent: 4158558 (1979-06-01), Thompson et al.
patent: 4678649 (1987-07-01), Alexander et al.
patent: 4836995 (1989-06-01), Manor et al.
patent: 4885148 (1989-12-01), Erickson et al.

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