Sodium dihydrogen phosphate dihydrate: an in-depth analysis of the core raw material in multiple fields

1. Product Overview

Sodium Dihydrogen Phosphate Dihydrate (Sodium Dihydrogen Phosphate Dihydrate), with the chemical formula of NaH₂PO₄-2H₂O and CAS No. 13472-35-0, is an important inorganic compound. Its aliases include sodium dihydrogen phosphate monohydrate (care needs to be taken to distinguish between the different hydrate forms), sodium acid phosphate, and others. As a key member of the phosphate family, this compound occupies an important position in many fields, such as food processing, pharmaceutical manufacturing, water treatment, laboratory reagents, and agriculture, by virtue of its unique physical and chemical properties. Its molecular structure contains two crystalline waters, giving the product good solubility and stability, and becoming an irreplaceable functional raw material in industrial applications.

2.Physical and chemical properties

Sodium dihydrogen phosphate dihydrate is colorless or white crystalline powder, easily soluble in water (solubility of about 85 g/100mL at 20℃), the aqueous solution is weakly acidic (1% solution pH value of about 4.5). Its crystals are easily weathered in dry air, and gradually lose crystalline water when heated above 60℃, and finally anhydrous sodium dihydrogen phosphate is generated. The product is hygroscopic and should be sealed and stored in a cool and dry environment. It reacts with alkaline substances to form disodium hydrogen phosphate or trisodium phosphate, which makes it excellent in the field of pH adjustment.

3.Core application areas

Sodium dihydrogen phosphate has a wide range of applications covering food, pharmaceutical, chemical, agricultural and other industries. In the food industry, disodium phosphate, as a quality improver, can improve the ability to complex metal ions, pH value and ionic strength of foodstuffs, so as to improve the adhesion and water-holding properties of foodstuffs. Our country stipulates that sodium dihydrogen phosphate can be used in condensed milk, the maximum use amount is 0.5g/kg. In addition, it can also be used as feed phosphorus additives to provide animals with essential phosphorus elements. In the pharmaceutical field, disodium phosphate as a buffer and water softener, used to adjust the pH value of the drug solution and remove the hardness ions in the water. In the chemical industry, disodium phosphate is an important raw material for the manufacture of sodium hexametaphosphate and sodium pyrophosphate, and it can also be used in electroplating, boiler water treatment, and the manufacture of detergents, metal detergents and so on. In agriculture, disodium dihydrogen phosphate can be used as a fertilizer additive to improve soil fertility and crop yield.

As an important inorganic chemical raw material, sodium dihydrogen phosphate plays an irreplaceable role in many industries. With the progress of science and technology and the acceleration of industrialization, the application fields of sodium dihydrogen phosphate will continue to expand, and the market demand will continue to grow. At the same time, with the improvement of environmental awareness and the concept of sustainable development, the production and use of sodium dihydrogen phosphate will also pay more attention to environmental protection and sustainability. In the future, sodium dihydrogen phosphate industry will usher in a broader development prospects and opportunities.

4. the production process and quality control

In terms of preparation, disodium phosphate is mainly produced by two industrial methods: disodium hydrogen phosphate neutralization method and soda ash neutralization method. The neutralization method of disodium phosphate is to dissolve disodium phosphate dodecahydrate with water, slowly add phosphoric acid under stirring to carry out the neutralization reaction, control the pH value between 4.2 and 4.6, and then obtain disodium phosphate dihydrate after evaporation and concentration, cooling and crystallization, and centrifugal separation. Soda ash neutralization method is to add extracted phosphoric acid into the neutralization reactor, slowly add soda ash solution for neutralization reaction, the same by filtration, evaporation and concentration, cooling crystallization and other steps to produce products. These two methods have their own advantages and disadvantages, according to the actual production needs to choose!

5. Market status and development trend

Global annual production capacity of more than 2 million tons, China accounted for about 45%, the main producers include Hubei Xingfa, Guizhou Chuanheng and so on. The price range of food-grade products is 5000-8000 yuan/ton, and pharmaceutical grade can reach 12-15,000 yuan/ton. Emerging demand is focused on: new energy sector: lithium-ion battery anode material precursor preparation; biodegradable materials: catalyst for polyphosphate synthesis; environmental technology: heavy metal contaminated soil remediation agent. With the upgrading of the EU REACH regulations and the FDA's tightening of control over food additives, high purity (≥ 99.9%), low impurity products will become the mainstream of the market. The application of green production process such as membrane separation and crystallization technology reduces the energy consumption per unit of product by more than 30% and promotes the sustainable development of the industry.

6.safety and storage and transportation specifications

This product is a non-hazardous chemical, but it should be noted that sodium dihydrogen phosphate should be stored in a cool, ventilated, dry, clean and non-toxic warehouse, avoiding direct sunlight and high temperature. Since sodium dihydrogen phosphate has strong hygroscopicity, special attention should be paid to moisture-proof during storage. When transporting, a well-sealed container should be used to prevent leakage and spillage. Transportation vehicles should have appropriate qualifications and documents, and transportation personnel should be professionally trained. During storage and transportation, it should be kept away from fire source, heat source and oxidizer and other dangerous substances to ensure safety.  

As a basic chemical of modern industrial system, sodium dihydrogen phosphate dihydrate is being extended from traditional application to high value-added fields through continuous technical innovation, and its market potential is expected to maintain an annual growth rate of 6-8% in the next five years. Enterprises need to strengthen application technology R&D and develop customized products in depth to respond to the increasingly segmented market demand.

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