Phosphoric acid or orthophosphate, chemical formula H3PO4, molecular weight 97.9724, is a common inorganic acid, is a strong acid. It can be obtained by dissolving phosphorus pentoxide in hot water. In orthophosphate industry, apatite is treated with sulfuric acid. Phosphoric acid is easily deliquescent in air. Pyrophosphoric acid can be obtained by heating, and then metaphosphoric acid can be obtained by further dehydration. Phosphoric acid is mainly used in pharmaceutical, food, fertilizer and other industries. It can also be used as a chemical reagent.

application area

Agriculture: Phosphoric acid is the raw material for the production of important phosphate fertilizers (superphosphate, potassium dihydrogen phosphate, etc.), and also for the production of feed nutrients (calcium dihydrogen phosphate).

Industry: Phosphoric acid is an important chemical raw material. Its main functions are as follows:

The metal surface is treated and insoluble phosphate film is formed on the metal surface to protect the metal from corrosion.

Mixed with nitric acid as a chemical polishing agent to improve the surface finish of metal surface.

Phosphate is the raw material for the production of detergents and pesticides.

Raw materials for the production of phosphorus-containing flame retardants.

Food: Phosphoric acid is one of the food additives. It is used as acidifier and yeast nutrient in food, and phosphoric acid is contained in Coca-Cola. Phosphates are also important food additives and can be used as nutritional enhancers.

Medicine: Phosphoric acid can be used to prepare phosphorus-containing drugs, such as sodium glycerophosphate.