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Mar 30, 2021
1 Trichlorosilane:
Trichlorosilane is an important intermediate for the synthesis of organic silicon, and it is also the main raw material for the preparation of semiconductor-grade polysilicon and solar cell-grade polysilicon. For a long time, due to the small production capacity of polysilicon in my country, trichlorosilane is mainly used for silicone rubber coupling agents and other organic silicon materials, and the amount of polysilicon is very small.
Trichlorosilane process technology plan:
① Silicohydrochlorination method: This method uses metallurgical grade silicon powder as raw material to react with hydrogen chloride gas, using copper or iron-based catalysts, and the reaction is carried out at 280～320℃ and 0.05～3Mpa:
② Silicon tetrachloride hydrogenation method: This reaction is an equilibrium reaction. In order to increase the yield of trichlorosilane, it is preferably carried out in the presence of hydrogen chloride. The yield of chlorohydrin silicon. The reaction is carried out at a temperature of 280～320℃ and 0.05～3Mpa:
Description of Trichlorosilane:Trichlorosilane is an important synthesis of organic silicon intermediates, but also the preparation of semiconductor grade polysilicon and solar cell grade polysilicon of the main raw materials. For a long time, due to China's smaller production capacity of polysilicon, trichlorosilane is mainly used for organic silicone rubber coupling agent and other silicone materials, the amount of polysilicon is very small.
Hydrogen chloride method: the method is to use metallurgical grade silicon powder as raw material, and hydrogen chloride gas reaction. Is copper or iron-based catalyst, the reaction at 280 ~ 320 ℃ and 0.05 ~ 3Mpa under:
Hydrogenation of silicon tetrachloride: The reaction is an equilibrium reaction. To improve the yield of trichlorosilane, it is preferable to carry out the reaction in the presence of hydrogen chloride. Raw materials metallurgical grade products through pre-activation to remove the surface oxide, can further improve the yield of trichlorosilane. The reaction is carried out at a temperature of from 280 to 320 ° C and from 0.05 to 3 MPa:
2 Chloropropene:
① High-temperature chlorination method Propylene is preheated and then chlorinated at high temperature. After condensation, the crude product is obtained, and the finished product is obtained by distillation.
② The oxychlorination method uses propylene, hydrogen chloride and oxygen in the presence of a tellurium catalyst to carry out a gas phase reaction.
3 One methyl dichlorosilane:
The by-product of our Luxi Chemical Group's organosilicon has a purity of 99%.
4 Vinyl chloride:
Production method of vinyl chloride
① Vinyl chloride was first industrially produced in the 1930s, when it was obtained by the hydrolysis of calcium carbide and the addition reaction of acetylene and hydrogen chloride. The chemical reaction equation is:
CaC2 + 2H2O → Ca(OH)2 + C2H2
C2H2 + HClCH2CHCl
② In the early 1950s. The production of ethylene and chlorine has been realized, and ethylene has become a more economical and reasonable industrial production route for the production of vinyl chloride. The process includes the direct chlorination of ethylene to produce dichloroethane and the cracking of dichloroethane to produce vinyl chloride.
Later, people noticed that the cracking process of dichloroethane produced hydrogen chloride in addition to vinyl chloride. Therefore, the industry thinks that hydrogen hydride can be combined with the acetylene production process to produce vinyl chloride.
CH 2 = CH2 + C12 → CH 2C1—CH 2C1
CH 2C1-CH 2C1 → CH 2 = CHC1 ten HC1
Ten HCl → CH 2 = CHC1
③ In the late 1950s, the ethylene oxychlorination process was developed to meet the growing demand for vinyl chloride.
In this process, ethylene, oxygen and hydrogen chloride react to produce dichloroethane, which is combined with the direct chlorination process. The dichloroethane produced by the two is cracked together to obtain vinyl chloride. This production method is called equilibrium law.
The total reaction formula: 2CH2=CH2 + Cl2 +O2 → 2CH2=CHCl + H2O