METHOD OF THE AMMONIUM PHOSPHATE CLEANING Russian patent published in 2006 - IPC C01B25/28 C05B7/00 

FIELD: chemical industry; food industry; pharmaceutical industry; other industries; methods of the ammonium phosphates cleaning.

SUBSTANCE: the invention is pertaining to the methods of the ammonium phosphates cleaning for the purpose of production of the pure and the high-clean products having the wide application in many industries, such as chemical, alimentary, pharmaceutical industries, etc. The method includes the stage by stage ammonium phosphates recrystallization from the saturated water solution. At the first stage they introduce the preliminary cleaned monoammophos containing of no more than 1.5 % of SO₄, and each stage of the recrystallization is realized in two steps, on the first of which they conduct evaporation of the solution at the temperature of 100-105°C within 1-2 hours and the active stirring action with the rate of 5-7 turns/second up to the achievement of the ratio of L:S = 1:1, and at the second step lead the chilling of the solution up to the temperature of 20-25 °C within 3-4 hours at the slow stirring action with the rate of 1-3 turns/second up to the achievement of the ratio of L:S = 1:1.776. The technical result of the invention consists in the increased output and the degree of the product purity, reduction of the production process duration.

EFFECT: the invention ensures the increased output and the degree of the product purity, reduction of the production process duration.

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