[Chemical Knowledge]：The nature, use, upstream and downstream raw materials, storage methods of sodium dihydrogen phosphate, and what is sodium dihydrogen phosphate used

1. of Sodium Dihydrogen Phosphate Basic Properties

Sodium dihydrogen phosphate (NaH₂ POWH), also known as sodium dihydrogen phosphate monohydrate, is an inorganic compound, usually in the form of anhydrate or monohydrate. Its molecular weight is 119.98g/mol (anhydrate) and 137.99g/mol (monohydrate). At room temperature, sodium dihydrogen phosphate is a white crystalline powder with hygroscopicity. It is highly soluble in water, and its solubility increases with increasing temperature. Sodium dihydrogen phosphate is weakly acidic in aqueous solution, and the pH value is between 4.5 and 4.7.

2. of sodium dihydrogen phosphate main purpose

Sodium dihydrogen phosphate is widely used in many fields, including the following aspects:

1. The food industry

In the food industry, sodium dihydrogen phosphate is a common food additive, numbered E339. It is mainly used as acidity regulator, emulsifier and chelating agent. Sodium dihydrogen phosphate can help stabilize the pH of food and prevent food spoilage. It is also used to make cheese, leavened bread, etc. to enhance the taste and extend the shelf life.

2. Water treatment

In the water treatment industry, sodium dihydrogen phosphate is used as a corrosion inhibitor and scale inhibitor. It can effectively prevent the corrosion of metal pipes and the formation of scale, and extend the service life of the equipment. This is particularly important in industrial cooling systems, boiler systems and municipal water supply systems.

3. Medicine and Cosmetics

Sodium dihydrogen phosphate is used in the pharmaceutical field for the preparation of sustained-release drugs and for stabilizing drug formulations. In the cosmetics industry, it is used as a pH regulator and emulsifier to ensure the stability and safety of products.

4. Laboratory Reagents

In chemical laboratories, sodium dihydrogen phosphate is often used as an analytical reagent and as a component of buffer solutions. Due to its stable acid-base properties, it plays a key role in many biological and chemical studies.

3. of sodium dihydrogen phosphate upstream and downstream raw materials

The production of sodium dihydrogen phosphate involves multiple chemical raw materials and intermediates. The following is an analysis of its main upstream and downstream raw materials:

1. Upstream raw materials

The main upstream raw materials of sodium dihydrogen phosphate include phosphate rock, sulfuric acid and sodium hydroxide (or sodium carbonate). Phosphoric acid is obtained by processing phosphate rock, which is then reacted with sodium hydroxide (or sodium carbonate) to produce sodium dihydrogen phosphate. Specific chemical reactions are as follows: [\text{H}3\text{PO}4 + \text{NaOH} \rightarrow \text{NaH}2\text{PO}4 + \text{H}_2\text{O}]

2. Downstream products

As a basic chemical product, the downstream products of sodium dihydrogen phosphate involve many industries. It can be further used to produce other phosphates, such as trisodium phosphate, potassium dihydrogen phosphate, etc. Sodium dihydrogen phosphate is also an important component of many compound fertilizers, which are used in agricultural production to increase the phosphorus content of soil.

4. sodium dihydrogen phosphate storage method

Sodium dihydrogen phosphate has a certain moisture absorption, and special attention should be paid to moisture-proof during storage. The following are its main storage methods and considerations:

1. Storage environment

Sodium dihydrogen phosphate should be stored in a dry, well-ventilated warehouse, avoid direct sunlight and high temperature environment. The relative humidity in the warehouse should be controlled below 50% to prevent moisture absorption and agglomeration.

2. Packaging requirements

Sodium dihydrogen phosphate is usually packed in woven bags lined with plastic bags, each with a net weight of 25kg or 50kg. For high-purity products, plastic drums or other sealed containers can be used to ensure that the product is not affected by humid air during transportation and storage.

3. Safety protection

Appropriate protective equipment such as gloves, goggles and dust masks should be worn when handling and storing sodium dihydrogen phosphate. Avoid direct contact between the product and skin and eyes. If contact is not careful, rinse immediately with plenty of water.

4. Storage and transportation precautions

Sodium dihydrogen phosphate should be stored separately from oxidants and strong acids to avoid chemical reactions. During transportation, the package shall be protected from damage and leakage, and the relevant regulations on transportation of dangerous goods shall be observed.

5. market prospects and trends

With the continuous development of industry and agriculture, the demand for sodium dihydrogen phosphate has shown a steady growth trend. Especially in the fields of water treatment, food additives and fertilizer production, the market demand for sodium dihydrogen phosphate will continue to grow. With the improvement of environmental awareness, the demand for green and environmentally friendly water treatment agents will also promote the development of the sodium dihydrogen phosphate market.

In general, as an important chemical product, sodium dihydrogen phosphate has broad application prospects and market potential. In the future market competition, the improvement of product quality and the optimization of production process will become the key factors for enterprises to gain competitive advantage.

Sodium dihydrogen phosphate has become an indispensable product in the chemical industry due to its excellent chemical properties and a wide range of applications. Through scientific production and storage management, it can maximize its application value and promote the sustainable development of related industries.