Production of low-chloride fertilizers

Chemistry: fertilizers – Processes and products – Inorganic material

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71 35, 423309, C01B 2530, C05B 700

Patent

active

050551248

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. to about 200.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.

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Britzke et al., J. Chem. Ind. (Moscow), 7,4-11 (1930).

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