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Phosphorous acid CAS#13598-36-2

Phosphorous acid CAS#13598-36-2

Basic Information

Phosphorous acid
H₃PO₃

Phosphorous acid, also known as orthophosphorous acid, is an intermediate for phosphorus-containing compounds. It is used to prepare water-treatment phosphonates, agricultural phosphites and lubricant additives. Specific synthesis applications include aminophosphonic acids through multicomponent and amidoalkylation chemistry. Other industrial uses involve plastic stabilization and metal surface protection, distinguishing this feedstock from finished phosphate or phosphonate formulations.

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product description

Serves as a key intermediate for the preparation of various phosphorus compounds.


Used to produce phosphonates for water treatment, including scale inhibition, corrosion control, and chlorine stabilization.


Alkali metal salts (phosphites) act as effective agricultural fungicides and high-quality sources of plant phosphorus nutrition.


Functions in stabilizing plastic mixtures, protecting corrosion-prone metal surfaces at high temperatures, and producing lubricants and lubricant additives.

Product Description of Phosphorous acid CAS#13598-36-2

Phosphorous acid is an important intermediate for the synthesis of various phosphorus compounds. It acts as a key raw material for water-treatment phosphonates, applicable to iron and manganese regulation, scale inhibition and removal, corrosion protection and chlorine stabilization. Its alkali metal phosphites are widely used as agricultural fungicides against downy mildew and serve as an excellent phosphorus nutrient source for plants. Besides, it is used for stabilizing plastic blends, high-temperature anti-corrosion protection of metal surfaces, as well as the production of lubricants and lubricant additives.


Product Application of Phosphorous acid CAS#13598-36-2

Phosphorous acid (H₃PO₃, orthophosphorous acid) is a key raw material for synthesizing the following products:

α-aminomethylphosphonic acids via Mannich multicomponent reactions

1-aminoalkanephosphonic acids by amidoalkylation and subsequent hydrolysis

N-protected α-aminophosphonic acids (phospho-isosteres of natural amino acids) through amidoalkylation reactions




Product Specifications

Parameters


Melting point73 °C
Boiling point200 °C
density1.651 g/mL at 25 °C(lit.)
vapor pressure0.001Pa at 20℃
Fp200°C
storage temp.0-6°C
solubilityDMSO (Slightly), Methanol (Slightly), Water (Sparingly)
pkapK1 1.29; pK2 6.74(at 25℃)
formCrystals
colorWhite
Specific Gravity1.651
PHpKa1= 1.10, pKa2 = 6.33(25℃)
Water SolubilitySOLUBLE
SensitiveAir Sensitive & Hygroscopic
Merck147346
Stability:Stable. Incompatible with strong bases. Hygroscopic.
InChI1S/H3O3P/c1-4(2)3/h4H,(H2,1,2,3)
InChIKeyABLZXFCXXLZCGV-UHFFFAOYSA-N
SMILES[H]P(O)(O)=O
CAS DataBase Reference13598-36-2(CAS DataBase Reference)
NIST Chemistry Reference(HO)2HPO(13598-36-2)
EPA Substance Registry SystemPhosphonic acid (13598-36-2)

Safety Information


Hazard CodesC
Risk Statements22-35
Safety Statements26-36/37/39-45
RIDADRUN 2834 8/PG 3
WGK Germany1
RTECSSZ6400000
F3
TSCATSCA listed
HazardClass8
PackingGroupIII
HS Code28092019
Storage Class8A - Combustible corrosive hazardous materials
Hazard ClassificationsAcute Tox. 4 Oral
Eye Dam. 1
Met. Corr. 1
Skin Corr. 1A


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Shipping And Transportation

Delivery Time

Inventory 2-3 working days New manufacturing 7-10 working days

Mode of Transportation
1. By Air, fast but expensive.
2. By Sea, usual and economy.
3. By Train, suit for middle Asia countries.
4. By Express, suit for small package.
We only provide highest quality goods available, accompanied by after support!

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FAQ

1. What products does Shandong Junzheng Chemical supply?
We supply inorganic chemicals, organic solvents, water treatment chemicals, and surfactants, including calcium chloride, soda ash, sodium bicarbonate, caustic soda, citric acid, ethyl acetate, and SLES. Please contact us to confirm specific product availability.


2. Which industries do your products serve?
Our products serve pharmaceutical, agrochemical, dye, rubber, construction, coal processing, and other chemical industries. Product suitability depends on the required grade, specifications, and application.


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Please provide the product name, CAS number, required specifications, quantity, packaging requirements, and destination port. These details help us prepare an accurate quotation.


4. How do you control product quality?
We follow strict quality testing procedures supported by technical personnel, research equipment, and an established management system. Specific quality requirements can be confirmed before placing an order.


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