Phosphonic Acid

What is Phosphonic Acid (Phosphorous Acid)?

Molecular Formula (Phosphonic Acid): H₃PO₃

Molecular Weight: 80.987 g/mol

Chemical Name: Phosphonic Acid (Phosphorous Acid)

CAS Number: 13598-36-2

Phosphonic Acid (Phosphorous Acid) is also defined as phosphorus acid. It 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 to an oxygen with a double bond.

It is a very hygroscopic substance.

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
• O-phosphorous acid

How is it Produced?

There are many methods for its production. The most commonly used method in the production process is the use of dialkyl phosphonates under acidic conditions (via HCl application) or the McKenna procedure (a two-stage reaction using bromotrimethylsilane followed by methanolysis), which provides the best methods for producing this chemical.

What are the Physical and Chemical Properties?

Physically, it is a white, solid, crystalline chemical.

The melting point is 73 °C.

The boiling point is 200 °C.

The density at 25 °C is 1.651 g/ml.

It is a hygroscopic, air-sensitive chemical.

It exhibits a stable structure but is an incompatible chemical with strong bases.

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

Phosphorous acid reacts exothermically with amines and inorganic hydroxides to form salts.

What are the Application Areas of Phosphonic Acid?

• Phosphorous acid is used as an intermediate in the preparation of some phosphorous compounds.
• Aminophosphonic acids are obtained by the combination of phosphorous acid with some amine compounds. These compounds are used to control iron (Fe) and manganese (Mn), which accumulate in water systems and cause scale and corrosion. This ensures the inhibition of manganese and iron accumulated in the water system.
• It is a raw material used in the preparation of phosphonates in water treatment, such as corrosion control and chlorine stabilization.
• Metal salts of phosphorous acid (phosphites) are widely used either as an agricultural fungicide or as a superior source of phosphorus nutrition in plants.
• Phosphorous acid is used in stabilizing mixtures for plastic materials. One of these phosphorous acids is phosphonic acid.
• It is used to prevent high temperatures on metal surfaces prone to corrosion.
• It is used in the manufacture of lubricants and lubricant additives.
• Phosphorous acid is used to initiate the polymerization of some alkenes.
• It is used in the manufacture of agricultural chemicals and anti-scaling agents. In this field, it does not pollute the environment as it is a non-pesticide compound. In agriculture, diseases that may occur in plants are prevented by pre-applying it to the plants. It is used in this field by being modified together with potassium hydroxide. Phosphorous acid and Potassium hydroxide should not be mixed at the same time while creating a solution because KOH is a high-level alkaline chemical.
• In the coating sector, protecting aluminum against corrosion by forming a monolayer film on aluminum is carried out with Phosphonic Acid (Phosphorous Acid).
• It is used as a surfactant.
• Phosphorous acid can be used as a phosphate source in the manufacture of automotive care products.
• In the agriculture sector, it prevents the formation of pathogens including water molds and downy mildew. At the same time, it acts as a fungicide.
• Phosphorous acid is used to prevent mold formation in tree and wood products.
• It is used in the manufacture of fabric, textile, and leather products. In the textile sector, it acts by binding to cellulose fibers with the help of a phosphorus ester bond.
• It is used in the manufacture of laundry and dishwashing products.

What Factors Affect Its Prices?

Phosphonic Acid (Phosphorous Acid) prices have generally shown an increase for a long time. In terms of price, Phosphonic Acid (Phosphorous Acid) is directly dependent on its application area. As the application areas increase, its prices will also increase.

Phosphonic Acid (Phosphorous Acid) price depends on production capacity. When a Phosphorous Acid production facility where this chemical is produced is established, it will increase in price.

Those who sell Phosphonic Acid are generally companies that sell wholesale.

The price of Phosphonic Acid (Phosphorous Acid) is directly dependent on the prices of the raw materials used in its production. As the prices of raw materials used in production increase, prices will generally increase.