Phosphorous Acid

Phosphorous Acid

What is Phosphonic Acid (Phosphorous Acid)?

Molecular Formula (Phosphonic Acid (Phosphorous Acid)): H3PO3

Molecular Weight: 80.987 g/mol

Chemical Name: Phosphonic Acid (Phosphorous Acid)

CAS Number: 13598-36-2

It is also defined as phosphorus acid. Phosphonic Acid consists of 3 Hydrogen, 3 Oxygen, and 1 Phosphorus element. It is a phosphorus oxoacid in solid form, where a single pentavalent phosphorus is covalently bonded to a single hydrogen and two hydroxy groups, and connected to one oxygen via a double bond.

Other Names are as Follows;

• H3PO3
• Dihydroxyphosphine Oxide
• Phosphono group
• Hydrogen Phosphonic Acid (Phosphorous Acid)
• Dihydroxy(oxo) phosphonium
• Phosphorous Acid 99%
• Phosphorous Acid Solution
• Phosphonate, Phosphonic Acid (Phosphorous Acid)
• Oxo-[E5-Phosphanediol]
• 13598-36-2
• Oxo-[E5-Phosphonic Acid (Phosphorous Acid)]
• Dihydroxy[E5-Phosphanone]
• Phosphorous acid
• Orthophosphorous acid
• O-phosphorous acid

How is it Produced?

There are several methods for its production. In the Phosphonic Acid production process, the most commonly used method is the hydrolysis of dialkyl phosphonates under acidic conditions (using HCl). Alternatively, the McKenna procedure (a two-step reaction using bromotrimethylsilane followed by methanolysis) offers one of the best methods for producing Phosphonic Acids.

What are the Physical and Chemical Properties?

It is a white, solid chemical with a crystalline structure.

Melting point is 73 °C.

Boiling point is 200 °C.

Density at 25 °C is 1.651 g/mL.

It is a hygroscopic chemical that is sensitive to air.

Phosphorous Acid is stable but is incompatible with strong bases.

It can easily absorb oxygen from the air to form phosphoric acid.

Phosphonic Acid reacts exothermically with chemical bases, such as amines and inorganic hydroxides, to form salts.

What are the Areas of Use for Phosphonic Acid (Phosphorous Acid)?

• Phosphonic Acid is used as an intermediate in the preparation of other phosphorus compounds.
• Phosphorous Acid is used for scale inhibition and removal to provide Iron (Fe) and Manganese (Mn) control.
• It is a raw material used in the preparation of phosphonates for water treatment, such as corrosion control and chlorine stabilization.
• Metal salts of phosphorus acid (phosphites) are widely used either as agricultural fungicides or as a superior source of phosphorus nutrition for plants.
• Phosphorous acid is used in stabilizing mixtures for plastic materials.
• It is used to prevent high-temperature corrosion on metal surfaces prone to degradation.
• Used in the manufacture of lubricants and lubricant additives.
• Used to initiate the polymerization of certain alkenes.
• Used in the manufacture of agricultural chemicals and anti-scaling agents.
• Used as a coating agent and surface treatment chemical, serving as a phosphate source in this field.
• Used as a surfactant.
• Phosphorous Acid is used in the manufacture of automotive care products.
• Used in wood and timber products.
• Used in the manufacture of fabric, textile, and leather products.
• Utilized for its cleaning effect in the production of laundry and dishwashing products.
• Used as a chelating agent in the cleaning of heat exchangers.