Phosphorous acid

[Product Details]
Chinese Name: Phosphorous acid
Foreign Name: Phosphorous acid
Chemical Formula: H3PO3
Molecular Weight: 82.00
CAS Registry Number: 13598-36-2
Melting Point: 73.6°C
Boiling Point: 200°C
Density: 1.651 g/cm³
Flash Point: 200°C
Appearance: White or light yellow crystals with a garlic odor
Water Solubility: Easily soluble in water
Storage: Should be stored in a cool, ventilated, and dry warehouse. The packaging must be sealed, and it is strictly prohibited to store it in damp or inverted conditions. It should not be stored or transported together with alkaline substances, toxic items, H foaming agents, or other corrosive materials.
[Product Uses]
Phosphorous acid is mainly used as a reducing agent, a nylon whitening agent, and also as a raw material for phosphites, pesticide intermediates, and organic phosphorus water treatment agents.

The phosphorous acid produced and sold by our company is an inorganic compound with the chemical formula H3PO3 and a molecular weight of 82.00.
It is relatively soluble in water and alcohol solvents. In the air, it slowly oxidizes into phosphoric acid over time. When heated to 180°C, it decomposes into phosphoric acid and phosphine, which is highly toxic and explosive.

The phosphorous acid we produce is actually a dibasic acid. Its acidity is slightly stronger than that of phosphoric acid, and it has strong reducing properties. It easily reduces silver ions (Ag⁺) to metallic silver (Ag) and can also reduce sulfuric acid to sulfur dioxide. Additionally, it is highly hygroscopic and deliquescent, with corrosive properties.

The main uses of phosphorous acid domestically are generally as a reducing agent and a nylon whitening agent. It is also used as a raw material for phosphites, pesticide intermediates, and organic phosphorus water treatment agents. Typically, phosphorous acid is obtained through hydrolysis, which involves hydrolyzing phosphorus trichloride (PCl₃), followed by steam refining, cooling crystallization to remove hydrochloric acid, and decolorization.