Ammonium polyphosphate production

摘要

Stable aqueous ammonium phosphate containing a higher proportion of polyphosphates is obtained by reacting phosphoric acid with ammonia in the presence of sulfuric, nitric or hydrochloric acids under conditions sufficient to produce a partially neutralized melt containing polymeric phosphates at a temperature between 400 DEG and about 750 DEG F. by the autogenous heat of neutralization, quenching and further neutralizing the melt.