Phosphorous acid

Phosphorous acid is a binary acid, structural formula H3PO3, CAS No. 237-066-7, acidic than phosphoric acid, can be used to produce aluminum phosphite, potassium phosphite, copper phosphite, ammonium phosphite and other products. It has the characteristics of good water solubility, odorless, high solubility, low content of chloride ion and iron ion. The decomposition temperature of Phosphorous acid is 200℃, and the decomposition product is phosphine and other harmful gases. Production processes and raw materials include phosphorus trichloride PCl3, propionyl chloride by-product, pivaloyl chloride by-product, isobutyryl chloride by-product, valeroyl chloride by-product, butyryl chloride by-product and other processes, among which the quality of phosphorus trichloride process reaches the excellent grade, the content of which is up to 99%, which can satisfy the standard of export.

Basic Information

English name: Phosphorous acid

CAS number: 13598-36-2

Molecular formula: H3PO3

Molecular weight: 82

Density: 1.65g/cm3

UN Number: 2834

EC NO: 237-066-7

Appearance: White crystal

Melting point: 73.6℃

Boiling point: 200℃ (decomposition)

Solubility: soluble in water, alcohol, strong hygroscopicity.

Density: 1.65g/cm³

Dangerous characteristics: corrosive, heat decomposition to produce particularly harmful gas PH3.

Hazard code: 81502

Danger category: 8

Product Characteristics

1, High content

The content of Phosphorous acid of PCl3 hydrolysis process is higher than that of common by-products. The finished product of common by-products process is generally 98%, and the content of the finished product of PCl3 process can reach 99% or 99.5%.

2, Less impurity

Superior grade Phosphorous acid is much better than the common by-product recycling process in terms of metal ions, heavy metals, chloride ions, sulfuric acid and other ions. It meets the requirements of electronic and electrical appliances and precision synthesis industry.

3、Low odor

The odor of genuine raw material of phosphorous acid is lower, while the by-product process may have many kinds of odors, even malodorous. It has great influence on production and working environment.

4, Stable quality

Different batches of PCl3 process Phosphorous acid data is basically the same, while the by-product raw materials of each batch of the appearance, content, odor, color, metal ion content and other indicators often appear drastic changes. It has a great negative impact on the quality of downstream products used in the synthesis process.

Product Indicators

H3PO3≥99.0％

PO4≤0.1％

Cl≤0.005％

SO4≤0.0001％

Pb≤0.0002％

Fe≤0.001％

Action Mechanism

Phosphorous acid is + 3-valent phosphorus, which has strong reducibility and can undergo replacement reaction with metal ions. At the same time, it has destructive effects on microbial cell membrane, protein and DNA. Therefore, in industrial production, it can react with other metal salts to generate corresponding phosphite, and in agriculture, phosphite has a bactericidal effect. Phosphorus +3 can be converted to phosphorus pentoxide after oxidation, which is an effective fertilizer.

Usage

1，Water treatment

In water treatment, Phosphorous acid can be used as corrosion inhibitor and scale inhibitor to prevent corrosion and scaling of metal pipes and equipment. It can also be used to remove pollutants such as phosphate and heavy metal ions in water.

2, Flame retardant

Phosphite can be used to produce aluminum phosphite halogen-free flame retardant, its flame retardant effect and aluminum hypophosphite flame retardant close to, but the stability, temperature resistance, dispersion, resistance to precipitation of aluminum phosphite is better than aluminum hypophosphite.

3、Agricultural field

It can be used to produce potassium phosphite, ammonium phosphite, calcium hydrogen phosphite and other products, which can help to enhance the plant's immune system, so that the plant can react more quickly in the face of invasion of pathogenic bacteria, activate the plant's own active defense mechanism, and enhance the crop's disease resistance. In agriculture, it has the effect of bactericidal double effect, and it has a good role in controlling prosperity.

4, Plastic coating field

Phosphorous acid phosphorus valence is +3 phosphorus, can capture the free radicals in the environment, inhibit oxidative degradation, can be added to plastic products as a stabilizer to extend the service life of plastic products.

Package

25kg/bag, woven bag, built-in film bag or 1000kg/bag.

Storage

Phosphorous acid is an acidic reducing agent, avoid storing with strong bases, oxidizing agents, metal salts. Keep the storage room cool and dry.

The Phosphorous acid's phosphorus valence, appearance and hypophosphate, phosphoric acid, etc. are completely different, is a good stability of inorganic dibasic acid. The price is related to changes in the phosphorus trichloride, glyphosate and other industries. At present, there are not many manufacturers that can produce 99% phosphorous acid on a large scale in China, and most of them are based on small by product recycling processes. Phosphorous acid belongs to 8 types of dangerous chemicals, export need to handle commodity inspection, dangerous bag, 20 feet small container packing quantity is 20 tons.