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.
1. Physical and chemical properties
Phosphorus trichloride is an inorganic compound with the chemical formula POCl3. It is a transparent to pale yellow smoky liquid with a pungent odor. Melting point; 1.25 ℃； Boiling
point: 105.3 ℃ Density; 1.675 g/cm³。
2. Synthesis process
The production processes of phosphorus oxychloride include hydrolysis, oxidation, and co production of thionyl chloride. Our company adopts advanced oxygen oxidation production
technology. During liquid-phase oxidation production, oxygen is injected into liquid phosphorus trichloride, and phosphorus trichloride is synthesized through interphase oxidation
between liquid and gas. The focus is on the design of the reactor and oxygen distributor. Or microreactor oxidation method, phosphorus trichloride is transported to the microreactor
through a metering pump. Oxygen is depressurized and metered into the microreactor through a flow meter. The two are mixed and reacted in the microreactor, and the reaction time
is extended through a microreactor delay pipeline to generate phosphorus trichloride. The process route is reasonable, the reaction is stable and easy to control, the reaction is
complete, the yield is high, the reaction process is simple, and it is conducive to the realization of continuous process.
3. Product Usage
In the chemical industry, it can be used as a chlorinating agent, organic synthesis catalyst, and is one of the main raw materials for ester organic products. It is mainly used as an
intermediate in pesticides, pharmaceuticals, and dyes, and is also widely used in industries such as semiconductor doping sources and optical fiber materials. Electronic grade
phosphorus trichloride (6N, 7N), also known as high-purity phosphorus trichloride, is mainly used as a dopant for PN junction production in integrated circuit (IC) production and fine
processing of crystalline silicon solar cells. It serves as a diffusion source for pentavalent element phosphorus (P).
1. Physical and chemical properties
Phosphoric acid is a common inorganic acid with the chemical formula H3PO4. It is a colorless, transparent or slightly light colored viscous liquid. Pure phosphoric acid is a colorless
crystal, odorless, and has a sour taste. Melting point (℃): 42.35 (pure), boiling point (℃): 261, relative density 1.70, relative density (water=1): 1.87 (pure), relative vapor density
(air=1): 3.38 Saturated vapor pressure (kPa): 0.67 (25 ℃, pure), miscible with water and ethanol.
2. Synthesis process
The production process of phosphoric acid includes wet process and hot process. The commonly referred to "wet process" refers to the sulfuric acid method for preparing phosphoric
acid. Phosphorus ore powder is dissolved with sulfuric acid, and phosphoric acid is produced through filtration, deoxidation, impurity removal, extraction and essence. During this
process, by-products phosphogypsum and hydrogen fluoride will be produced. The wet process is generally of low purity, and it is an industrial product, mainly used for phosphate
fertilizer and phosphate. Thermal process, thermal phosphoric acid is produced by injecting yellow phosphorus into a spray gun through a phosphorus pump, and then spraying it into
a combustion tower to generate pentoxide. The pentoxide flue gas enters the hydration tower and hydrates with ultrapure water to produce phosphoric acid. After coarse and fine
filtration, high-purity phosphoric acid is obtained by entering the aeration tower. Thermal process is generally used to prepare electronic grade and food grade phosphoric acid.
3. Product Usage
Mainly used in industries such as pharmaceuticals, food, fertilizers, pigments, electroplating, rust prevention, and electronics, it can also be used as a chemical reagent.
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