Sodium tri:metaphosphate production

摘要

Process for preparing Na trimetaphosphate comprises passing aqueous Na phosphate solution continuously into a reactor with a shifting bed of Na trimetaphosphate heated to 300-500 deg C while regulating the rate of addition of the Na phosphate solution per unit of time with respect to the rate of drying of the reactor contents so that a moist phase with a moisture content of 1-40 (3-10) wt. % is maintained on the shifting bed.