A method of spray drying in one step to produce sodium tripolyphosphate 90 purity or greater.

摘要

A single-step spray-drying process for the production of high-content sodium tripolyphosphate having a high concentration of material of form I by spray-drying an aqueous charge liquid of sodium orthophosphate having an Na2O:P2O5 ratio of 1.60:1.70 at temperatures between 250 and 420 DEG C for a period of up to one minute in order to produce sodium tripolyphosphate, and cooling the product to 150 DEG C or below within 20 minutes or within a shorter time.