1. Physical and chemical properties

Phosphorus trichloride is a colorless and transparent liquid that is volatile and has a pungent odor Its boiling point is 76.6 ℃, melting point is -91 ℃, density (Cd20) is 1.574t/m3, boiling

range (74.5-77.5 ℃. V/V) is ≥ 95.0%. Phosphorus trichloride is easily soluble in benzene, carbon disulfide, ether, chloroform, etc.

2. Synthesis process

Using phosphorus trichloride as the reaction solvent, dry gaseous chlorine gas and liquid yellow phosphorus undergo chlorination reaction. Yellow phosphorus is chlorinated into

phosphorus trichloride, which is separated and purified through a phosphorus washing tower to prepare qualified phosphorus trichloride. And release a large amount of heat.

3. Product Usage

Phosphorus trichloride is widely used in the organic synthesis industry, mainly as a raw material for the production of organophosphate pesticides such as dichlorvos, organophosphate,

and rice blast. It is also used as a raw material for the production of products such as phosphorus pentachloride, phosphorus trichloride, and hypophosphite esters. The pharmaceutical

industry is used to produce sulfamethoxazole (S, D) and sulfamethoxazole (S, M, D), while the dye industry is used as a condensing agent for color powders.

1. Physical and chemical properties

Phosphorus pentachloride (PCl5) has a molecular weight of 208.24 and appears as white or yellowish tetragonal crystals. Density 1.60g/cm3. Melting point 167 ℃. Dissolve in carbon

disulfide, carbon tetrachloride, and benzoyl chloride. Hydrolysis into phosphoric acid and hydrogen chloride in humid air produces white smoke and special irritants. When heated to

160 ℃, sublimation begins and some decomposition occurs. At 300 ℃, it completely decomposes into chlorine and phosphorus trichloride. The pure product is white, but after being

placed, it partially decomposes into phosphorus trichloride and chlorine gas, resulting in a light yellow color.

2. Synthesis process

Using phosphorus trichloride and chlorine gas as raw materials, phosphorus pentachloride is produced through chlorination reaction, and then processed by drying, dust collection, etc. to

obtain phosphorus pentachloride products.

3. Product Usage

Phosphorus pentachloride is an inorganic compound and one of the most important phosphorus chlorides. It is mainly used as a chlorination reagent for alcohols, carboxylic acids, amides,

aldehydes, ketones, and enols, as well as a Beckmann rearrangement reagent. It is used as a chlorinating agent and catalyst in organic synthesis, and is a raw material for the production of

pharmaceuticals, pesticides, dyes, and chemical fibers. It is also used as a dehydrating agent and a raw material for the production of chlorinated phosphazenes, phosphoryl chlorides, and

lithium hexafluorophosphate.

1. Physical and chemical properties

Phosphorous acid (H3PO3) has a molecular weight of 82.00 and is an inorganic compound. It is a colorless to pale yellow ice like crystal with a relative density of 1.651 (21.2 ℃). Melting

point 73,6 ℃. Garlic flavored, non flammable, easily soluble in water and ethanol, slowly oxidized to orthophosphate in air, and decomposed into orthophosphate and phosphine when

heated to 180 ℃. Phosphorous acid is a dicarboxylic acid with slightly stronger acidity than phosphoric acid. It has strong reducibility, hygroscopicity, deliquescence, and corrosiveness.

2. Synthesis process

The main method is hydrolysis: using phosphorus trichloride as raw material, adding phosphorus trichloride dropwise in a hydrolysis kettle and reacting with concentrated hydrochloric

acid to directly produce crude hypophosphite. The finished product of hypophosphite is obtained through negative pressure distillation, cooling crystallization, and centrifugation.

3. Product Usage

Phosphorous acid can be used as a reducing agent and pesticide intermediate. Used for manufacturing nylon whitening agents, plastic stabilizers, synthetic fibers, lead dihydrogen

phosphate, glyphosate, water treatment agent ATMP, and potassium dihydrogen phosphate. It is a raw material for the production of hypophosphite, synthetic fibers, plastic stabilizers,

and organic phosphorus pesticides. It can be used as a stabilizer for polycarbonate, an antioxidant in the production of nylon 1010, and also in the production of high-efficiency water

treatment agent ATMP. Crystalline hypophosphite has a high demand in markets such as the United States and Western Europe, and has broad market development prospects.

1. Physical and chemical properties

Sodium hypophosphite (NaH2PO2), with a molecular weight of 87.98, is an inorganic compound commonly found as a monohydrate. It is a colorless monoclinic crystal or a pearl like

crystal or white crystalline powder. The relative density is 1.388. Odorless and salty in taste. Easy to dissolve in water, ethanol, and glycerol; Slightly soluble in ammonia and ammonia

water; Insoluble in ether. The aqueous solution is neutral and has a solubility of 667g/lOOg water at 100 ℃. Easily deliquescent. When stored in a dry state, it is relatively stable, but when

heated above 200 ℃, it rapidly decomposes and releases toxic phosphine gas that can self ignite. When exposed to strong heat, it will explode, and when mixed with potassium chlorate

or other oxidants, it will explode. Sodium hypophosphite is a strong reducing agent that can reduce salts of gold, silver, mercury, nickel, chromium, cobalt, etc. to metallic states. Under

normal pressure, heating and evaporating sodium hypophosphite solution will cause an explosion, so evaporation should be carried out under reduced pressure.

2. Synthesis process

Sodium hypophosphite is produced by reacting yellow phosphorus with a mixture of sodium hydroxide and calcium hydroxide. The reaction product is filtered to remove calcium

hypophosphite, and then carbon dioxide is used to remove calcium ions. It is concentrated and crystallized by vacuum evaporation, and the crystals are dried to remove free water to

obtain the sodium hypophosphite monohydrate crystalline product.

3. Product Usage

Sodium hypophosphite, also known as sodium hypophosphite, has strong reducibility and is mainly used as a reducing agent for electroless nickel plating, non-metallic surface treatment

agents for plastics, glass, quartz, etc. It is also widely used in industrial anti-corrosion, water treatment, fabric finishing and other fields. Its application areas are constantly expanding and it

has become an important fine inorganic salt product.

1. Physical and chemical properties

Molecular formula of calcium hypochlorite: Ca (ClO) 2; Molecular weight: 142.98; Appearance: White powder; Melting point: 100 ℃; Density: 2.35g/cm3; Refractive index: 1.545; Solubility:

soluble in water, insoluble in ethanol. Calcium hypochlorite is a strong oxidant that can cause combustion and explosion when exposed to water or humid air, and can also cause explosions

when mixed with alkaline substances. There is a risk of combustion when in contact with organic matter and oil. Heating can cause rapid decomposition and explosion, releasing chlorine

gas when reacting with acid. Exposure to light can also cause explosion and decomposition, producing oxygen and irritating chlorine gas.

2. Synthesis process

There are two methods for preparing calcium hypochlorite: the calcium method and the sodium method. The traditional calcium method for producing calcium hypochlorite has outdated

technology and is produced by injecting a large amount of chlorine gas into lime water. However, there are technical problems such as high consumption of hazardous chlorine gas, high

labor costs, low calcium hypochlorite content, and fast loss. Therefore, the sodium method is mainly used for the preparation of calcium hypochlorite.

This process adopts a three-step chlorination mother liquor circulation high-efficiency salt separation method. One step of chlorination is used to prepare sodium hypochlorite solution,

two steps of chlorination are used to prepare basic calcium hypochlorite, and three steps of chlorination are used to prepare calcium hypochlorite. Then, the calcium hypochlorite is salt

separated and flash dried to obtain calcium hypochlorite product. The washed salt is dried to obtain sodium chloride product. The two-step chlorination mother liquor is circulated inside

the two-step chlorination reaction after alkali causticization, while the three-step chlorination mother liquor is returned to one-step chlorination, two-step chlorination, and three-step

chlorination to adjust the solid-liquid ratio of the three reaction systems.

3. Product Usage

Calcium hypochlorite, also known as bleaching powder, is an efficient inorganic disinfectant. Its active ingredient is calcium hypochlorite, and its effective chlorine is generally above 65%.

It has bleaching, sterilizing, disinfecting, and oxidizing effects. Compared to other disinfectants, bleach powder has a high effective chlorine content, good stability, long storage time,

minimal loss of effective chlorine content, and convenient transportation. It is widely used in industrial wastewater and drinking water treatment, swimming pool disinfection, bleaching of

paper, cotton and linen fabrics, bacterial control, disinfection of aquaculture, and disinfection of public places; The chemical industry is used for the purification of acetylene and the

production of chloroform and other organic chemical raw materials; It can be used as a wool anti shrink agent, deodorizer and many other fields. With the strengthening of people's

awareness of environmental protection and public health, bleaching powder has become a household necessity, and its application fields are constantly expanding. The demand is increasing

year by year, which also provides a good development opportunity for the production and sales of calcium hypochlorite. The price and efficiency of calcium hypochlorite products

are on the rise.