Method of preparing ultraphosphoric acid

Abstract From the Canadian patent

Ultraphosphoric acid containing a phosphorus to hydrogen ratio of greater than 1 can be prepared by bringing together in a reaction zone elemental phosphorus and a sufficient amount of oxygen in a freeoxygen containing gas to form phosphorus pentoxide and a sufficient amount of water to form ultraphosphoric acid. The mole ratio of water to phosphorus pentoxide is maintained less than 1:1. Heat is removed from the product stream of the reaction zone to condense at least some of the ultraphosphoric acid which is then collected. In the preferred embodiment, a heat exchange fluid such as pressurized water is circulated through a cooling coil positioned to remove heat from the product stream of …