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Promoting the development of the phosphorus oxychloride market under the rapid development of agriculture
2023/8/22
Phosphorus oxychloride is a mixture of organic and inorganic compounds, and the rapid development of agriculture has promoted the development of the phosphorus oxychloride market. Instrumentation and temperature control systems, as well as production processes such as separation, are essential for phosphorus oxychloride. The production technology of oxidation method is still in its early stages.
Phosphorus oxychloride belongs to the intermediate chemical raw material industry and is an important inorganic compound. It can be used as a chlorinating agent and organic synthesis catalyst in the chemical industry, with a wide range of uses. It is one of the main raw materials for ester organic products, mainly used in pesticides, pharmaceuticals, dye intermediates, and also widely used in industries such as semiconductor doping sources and optical fiber materials.
The technical characteristics of the phosphorus oxychloride industry mention that the production of phosphorus oxychloride mainly includes three methods: chlorination hydrolysis, oxidation, and co production. In China, chlorination hydrolysis method is commonly used, while a few factories use co production of sulfoxide chloride method, while oxidation method is still in its early stages. Phosphorus pentoxide method: This method involves first dissolving three times the amount of phosphorus pentoxide in one time the amount of phosphorus trichloride liquid phase, and then introducing three times the amount of chlorine gas to control the chlorine flow rate. The resulting colorless liquid is phosphorus oxychloride. Compared with the chlorination hydrolysis method, the phosphorus pentachloride method has improved the problem of three wastes, and the yield and safety have also been significantly improved. However, the labor intensity is relatively high, and the hygiene conditions are still insufficient.
The technical characteristics of the phosphorus oxychloride industry point out that phosphorus trichloride is added to the reactor according to the prescribed feeding ratio, chlorine gas is introduced, and water is added dropwise. The chlorine water ratio is controlled at around 4, and the speed of chlorine gas and water addition is controlled. The reactor jacket is heated with thermal oil to maintain a temperature of 105 to 110 ℃ inside the reactor, causing the reactants to vaporize. After condensation in the condenser, they are then returned to the reactor. Secondary injection of chlorine gas. Continue chlorinating and hydrolyzing the remaining phosphorus trichloride. When the color of the reflux liquid turns white and the residual amount of phosphorus trichloride is below 0.2%, the condensate is introduced into the finished product tank to form the phosphorus oxychloride product. The hydrogen chloride gas generated during the reaction process is fed into the tail gas absorption system and absorbed with water to prepare industrial hydrochloric acid for sale. This method has high consumption, multiple wastes, long reaction cycle, poor safety, low productivity, and a more intense reaction, which is prone to danger. At the same time, the reaction will generate HCl, which requires high equipment material requirements.
Analysis of the production process of phosphorus oxychloride
1. Preparation of raw materials and liquids
The raw materials of phosphorus oxychloride mainly include phosphorus trichloride and dichloromethane, among which phosphorus trichloride is the main raw material. Different raw materials have a significant impact on product quality. Due to the complex crystal structure of phosphorus trichloride, only good raw material control measures can ensure the quality of the raw materials. In the raw material preparation process, hydration reaction is generally used, and phosphorus trichloride and organic solvents are added to the mixer separately, Then add a buffer to organize the phosphorus oxychloride solution.
2. Instrument and temperature control system
The technical characteristics of the phosphorus oxychloride industry indicate that in the production process of phosphorus oxychloride, the reaction process is mainly controlled by temperature, so corresponding instruments and equipment must be installed to ensure temperature and reaction rate. In addition, a temperature control system is also very important, which can accurately control the temperature, thereby controlling the color and particle size of the product.
3. Separation and precision firing
Separation and precision firing are the last two steps in the production process of phosphorus oxychloride, and are also the most critical steps to ensure the safety and performance of the product. The separation step mainly uses methods such as boilers or evaporation ponds, while the precision burning step is carried out in a low-temperature oven, which can not only obtain high-purity phosphorus oxychloride, but also maintain the aerodynamic and thermal regulation performance of the product within the exposure time range.
Phosphorus oxychloride belongs to the intermediate chemical raw material industry and is an important inorganic compound. It can be used as a chlorinating agent and organic synthesis catalyst in the chemical industry, with a wide range of uses. It is one of the main raw materials for ester organic products, mainly used in pesticides, pharmaceuticals, dye intermediates, and also widely used in industries such as semiconductor doping sources and optical fiber materials.
The technical characteristics of the phosphorus oxychloride industry mention that the production of phosphorus oxychloride mainly includes three methods: chlorination hydrolysis, oxidation, and co production. In China, chlorination hydrolysis method is commonly used, while a few factories use co production of sulfoxide chloride method, while oxidation method is still in its early stages. Phosphorus pentoxide method: This method involves first dissolving three times the amount of phosphorus pentoxide in one time the amount of phosphorus trichloride liquid phase, and then introducing three times the amount of chlorine gas to control the chlorine flow rate. The resulting colorless liquid is phosphorus oxychloride. Compared with the chlorination hydrolysis method, the phosphorus pentachloride method has improved the problem of three wastes, and the yield and safety have also been significantly improved. However, the labor intensity is relatively high, and the hygiene conditions are still insufficient.
The technical characteristics of the phosphorus oxychloride industry point out that phosphorus trichloride is added to the reactor according to the prescribed feeding ratio, chlorine gas is introduced, and water is added dropwise. The chlorine water ratio is controlled at around 4, and the speed of chlorine gas and water addition is controlled. The reactor jacket is heated with thermal oil to maintain a temperature of 105 to 110 ℃ inside the reactor, causing the reactants to vaporize. After condensation in the condenser, they are then returned to the reactor. Secondary injection of chlorine gas. Continue chlorinating and hydrolyzing the remaining phosphorus trichloride. When the color of the reflux liquid turns white and the residual amount of phosphorus trichloride is below 0.2%, the condensate is introduced into the finished product tank to form the phosphorus oxychloride product. The hydrogen chloride gas generated during the reaction process is fed into the tail gas absorption system and absorbed with water to prepare industrial hydrochloric acid for sale. This method has high consumption, multiple wastes, long reaction cycle, poor safety, low productivity, and a more intense reaction, which is prone to danger. At the same time, the reaction will generate HCl, which requires high equipment material requirements.
Analysis of the production process of phosphorus oxychloride
1. Preparation of raw materials and liquids
The raw materials of phosphorus oxychloride mainly include phosphorus trichloride and dichloromethane, among which phosphorus trichloride is the main raw material. Different raw materials have a significant impact on product quality. Due to the complex crystal structure of phosphorus trichloride, only good raw material control measures can ensure the quality of the raw materials. In the raw material preparation process, hydration reaction is generally used, and phosphorus trichloride and organic solvents are added to the mixer separately, Then add a buffer to organize the phosphorus oxychloride solution.
2. Instrument and temperature control system
The technical characteristics of the phosphorus oxychloride industry indicate that in the production process of phosphorus oxychloride, the reaction process is mainly controlled by temperature, so corresponding instruments and equipment must be installed to ensure temperature and reaction rate. In addition, a temperature control system is also very important, which can accurately control the temperature, thereby controlling the color and particle size of the product.
3. Separation and precision firing
Separation and precision firing are the last two steps in the production process of phosphorus oxychloride, and are also the most critical steps to ensure the safety and performance of the product. The separation step mainly uses methods such as boilers or evaporation ponds, while the precision burning step is carried out in a low-temperature oven, which can not only obtain high-purity phosphorus oxychloride, but also maintain the aerodynamic and thermal regulation performance of the product within the exposure time range.
Overall, the downstream of phosphorus oxychloride is mainly in the fields of medicine, dyes, and pesticides, and the production process of phosphorus oxychloride in China is mainly led by the chlorination hydrolysis method.
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