Phosphorous Acid H3po3 CAS No. 13598-36-2 Agricultural Grade Food Grade

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Product origin: Shijiazhuang, Hebei, China

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US$ 20

Description

CAS No.	13598-36-2
Name	Phosphorous acid
Alias	rac-Phoenicol; orthophosphorus acid; Phoenicol
Molecular formula	H3PO3
Molecular weight	82.00
Melting point	73.6ºC
Density	Relative density (water =1)1.65
Vapor pressure	200ºC(decomposition)
Solubility	Soluble in water, alcohol
Stability	Stable
Appearance and properties	White crystalline powder, garlic flavor, easy to deliquescence
Danger mark	20 (acid corrosive products)
Uses	1.It is a raw material for the manufacture of plastic stabilizers, and is also used in the manufacture of synthetic fibers and phosphite. 2.It can be used as an intermediate of glyphosate and ethephon, and can also be used to produce high-efficiency water treatment agent.

Appearance and properties: White crystalline solid
Density: 1.651 g/mL at 25 °C(lit.)
Melting point: 73 °C
Boiling point: 200 °C
Flash point: 200°C
Water solubility: SOLUBLE
Acidity coefficient (pKa): pK1 1.29; pK2 6.74(at 25ºC)
Storage conditions/storage methods: The warehouse is ventilated and dry at low temperature, and stored separately from H pore-forming agent and alkali.

Production Method
Industrial production methods include phosphorus trichloride hydrolysis and phosphite method.
The hydrolysis method slowly adds water dropwise to phosphorus trichloride under stirring for hydrolysis reaction to generate phosphorous acid, which is refined Chemicalbook, cooled and crystallized, and decolorized to obtain finished phosphorous acid.
Its PCI3+3H2O→H3PO3+3HCl production process produces hydrogen chloride for recycling, which can be made into hydrochloric acid.

Stability Related
1. It is slowly oxidized into orthophosphoric acid in the air and decomposed into orthophosphoric acid and phosphine (highly toxic) when heated to 180ºC. Phosphorous acid is a dibasic acid, its acidity is slightly stronger than phosphoric acid, and it has strong reducibility, which can easily reduce Ag ions to metallic silver and sulfuric acid to sulfur dioxide. Strong hygroscopicity and deliquescence, corrosive. Can cause burns. Irritating to the skin. Placed in the air, it deliquesces and is easily soluble in water. When the temperature is higher than 160ºC, H3PO4 and PH3 are generated.

2. Stability: stable

3. Forbidden mixture: strong alkali
4. Avoid contact conditions: hot, humid air
5. Aggregation hazard: no aggregation
6. Decomposition product: phosphorus oxide

Uses
1.It is a raw material for the manufacture of plastic stabilizers, and is also used in the manufacture of synthetic fibers and phosphite.
2.It can be used as an intermediate of glyphosate and ethephon, and can also be used to produce high-efficiency water treatment agent.

Additional Information

Properties: white or light yellow crystal, with garlic flavor and easy deliquescence.
Melting point (ºC): 73 ~ 73.8
Boiling point (ºC): 200 (decomposition)
Relative density (water = 1): 1.65
Octanol/water partition coefficient: 1.15
Solubility: Soluble in water and ethanol.