2,3,5,6,7-Pentaoxa-1,4-diphosphabicyclo[2.2.1]heptane;phosphoric acid

DescriptionSuperphosphoric acid is made by the concentration of regular wet-process acid up to P2O5 concentrations of 78%. Granular polyphosphates suitable for bulk blending are made by reacting ammonia with regular wet process acid of 52% P2O5 content and using the heat of reaction to drive off water to produce a phosphate melt of 10-43-0, with about 40% of the phosphorus in the polyphosphate form. These materials are, however, not suitable for bulk blending due to their “sticky” nature (10).

UsesDehydrating, catalytic, and sequestering agents, for metal treating; many applications where a con- centrated monooxidizing acid is needed; laboratory reagent.

UsesPolyphosphoric Acid is a ligand used as an analytical tool to image nanoparticles through photon emission topography. Used also in the synthesis of pharmaceuticals.

UsesPolyphosphoric acid can be used as an analytical reagent in chemical industry and a powerful dehydrating agent for organic synthesis. It is used in production of acid phosphates and pharmaceuticals. Intermediate for production of phosphate esters with high mono-ester content. Polyphosphoric acid can be used as a catalyst during synthesis of dimethyl carbonate from urea and methanol. It is widely employed as acylation and alkylation reagent in various reactions. It can be used as a catalyst in the synthesis of various aromatic ketones. It may be used to prepare silica-supported polyphosphoric acid, an easy to handle, reusable heterogeneous catalyst. Polyphosphoric acid may be used in the synthesis of aromatic sulfones, N-substituted amides and 4-aminobenzophenones. Used as a catalyst and absorbent of ammonia during the synthesis of dimethyl carbonate (DMC). Used as a solvent in the synthesis of hyperbranched polybenzoxazoles.

General DescriptionPolyphosphoric acid (PPA) is widely employed as acylation and alkylation reagent in various reactions. It is a strong mineral acid with excellent dehydrating properties.