METHOD OF PRODUCTION OF HEPTADISODIC PHOSPHATE Russian patent published in 2006 - IPC C01B21/30 

FIELD: production of disodic phosphate by neutralization of phosphoric acid by soda for obtaining neutralized disodic phosphate solution after cooling.

SUBSTANCE: phosphoric acid is first neutralized by disodic phosphate solution to ratio Na₂O/P₂O₅ = 0.6-0.7 at temperature of 80°C and then with soda at temperature of 70-75°C at liberation of disodic phosphate by cooling the neutralized solution to 35°C at rate of 4-4.5 deg/h. Proposed method makes it possible to increase productivity of process by 1.15-1.5 times and to reduce amount of coolant by 1.5-2 times. Proposed method provides for reduction of expenses for packaging, storage, transportation and use by 1.3 times.

EFFECT: reduction of expenses for packaging, storage, transportation and use.

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