METHOD FOR PRODUCTION OF MONOBASIC SODIUM PHOSPHATE Russian patent published in 1997 - IPC

FIELD: chemical technology; may be used in manufacture of product for food industry as initial raw material for production of detergent compositions. SUBSTANCE: solution of monobasic sodium phosphate is produced by extraction of phosphoric acid with tributyl phosphate with subsequent reextraction of phosphoric acid from organic phase with sodium-containing reagent. The latter is used in the form of saturated aqueous solution of dibasic sodium phosphate taken in stoichiometric amount for neutralization of phosphoric acid with concentration of 36.0-50.2 mas.%. Reextraction is carried out at temperature of 41-90 C. Produced solution of monobasic sodium phosphate is separated in two similar parts. One of them is withdrawn as product and the other is directed for treatment with sodium carbonate with production of solution of dibasic sodium phosphate which is returned for reextraction. Process is simplified due to intensification of reextraction stage and optimization in distribution of flows. In so doing, solution with concentration of monobasic sodium phosphate of 48.7-62.9 mas.% is produced. EFFECT: higher efficiency. 1 tbl