Method and Device for Producing Polyphosphoric Acid

摘要

A method and device for producing polyphosphoric acid burns a fuel in combustion air in a combustion chamber, sprays a spray fluid comprising substantially pure orthophosphoric acid and undertakes polymerization-condensation of the pure orthophosphoric acid. A polyphosphoric acid in the form of an acid mist accompanied by formation of gases which mix with combustion gases resulting from burning of the fuel is formed to reach a predetermined temperature, wherein the mixture causes sudden lowering of combustion gas temperature. The acid mix is separated from the gas mixture and the polyphosphoric acid is collected at a bottom of the combustion chamber and the gas mixture is outputted via a lower part of the combustion chamber separate from the collection of polyphosphoric acid.

主权项

1. A device for producing polyphosphoric acid comprising:
a combustion chamber having an upper part and a lower part, a burner in said upper part of the combustion chamber, a first input for a fuel and a second input for combustion air, both located in the said upper part of the said combustion chamber and arranged for feeding said fluid and said air combustion to said burner, which generates a flame, a supply of spray fluid comprising orthophosphoric acid which is arranged to bring the said spray fluid to the height of said burner, into said flame, separating means allowing the said polyphosphoric acid produced in the said combustion chamber to be separated from a gas mixture which is also produced in the said combustion chamber and which entrains the said polyphosphoric acid, and in the said lower part of the combustion chamber an output for the polyphosphoric acid and an output for the said gas mixture.