Perphosphoric acid

Pressures varied from 20 to 1500 Ibf/in (0.14 to 10.5 MPa) and reaction times were of the order of 5-35 hours. Reaction promoters included peroxides and salts of persulphuric and perphosphoric acids. Activators , accelerators and buffering agents were also discussed in the patent. The process of manufacture of Kel-F is understood to be based on this patent. 

Orthophosphoric acid does not react with hydrogen dioxide, and there are no signs of the formation of a perphosphoric acid, analogous with persulphuric acid, when soln. of phosphoric acid are electrolyzed. J. Schmidlin and P. Massini,1 and J. d Ans and W. Friederich found the case to be different, however, if phosphorus pentoxide be treated with 30 per cent, hydrogen dioxide at low temp., for when the... 

Ordinary oxidising agents have no effect, but with the meta- or pyro-acid hydrogen peroxide gave perphosphoric acid (q.v. p. 184). 

Perphosphoric Acids.—The methods which have been used successfully in the preparation of persulphuric acids and persulphates have also been applied to perphosphoric acid and the perphosphates, i.e.—... 

If the perphosphoric acids are regarded as derivatives of hydrogen peroxide their constitution with quinquevalent phosphorus will be... 

Pyrophosphoric Acid—Polyphosphoric Acids—Metaphosphoric Acid—Complex Metaphosphoric Acids and their Salts—Properties and Reactions of Ortho-, Meta- and Pyro-phosphates—Common and Distinctive Reactions—Estimation of the Phosphoric Acids—Phosphorus m Alloys—Perphosphoric Acids. 

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