Process for producing ammonium polyphosphate

摘要

An improved process of concentrating wet process phosphoric acid by continuously contacting an acid feed containing at least about 56 weight percent of P2O5 based on the total weight of the feed with heated gases consisting of air and gaseous fuel combustion products thereby forming a mixture of said gases containing entrained superphosphoric acid particles, continuously coalescing said mixture in a coalescence zone forming coalesced superphosphoric acid and continuously removing the coalesced superphosphoric acid from said coalescence zone.