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2. Production diagram of tris(J-trifluoropropyl)chlorosilane: 1 - tank, 2-5, 7, -9, 13, 29, 38 - batch boxes; 6 - agitator; 10 - reactor; 11, 30 - coolers; 12 - hydrolyser; 14, 17, 23, 35 - collectors; 15 - dehydrator; 16, 22 - nutsch filters; 18, 24, 32 - rectification towers; 19, 25, 33 - condensers; 20, 21,26, 27, 34, 36, 37 - receptacles ; 28 - chlorinator; 31 - hydraulic gate. 1. Preparation of organochlorosilanes 21 ucts; the chlorination of tris(J-trifluoropropyl)silane and the rectification of chlorination products.
The yield of dimethyldichlorosilane in the presence of aluminum as a rule decreases due to the formation of trimethylchlorosilane; in the reaction with pure (semiconductor) silicon in the presence of copper trimethylchlorosilane is virtually not formed. The formation of trimethylchlorosilane due to the reduction of the quantity of dimethyldichlorosilane and the absence of trimethylchlorosilane in reactions based on pure silicon seem to testify that trimethylchlorosilane is a product of dimethyldichlorosilane disproportioning, which occurs in the conditions of synthesis under the influence of impurities (first of all, aluminum and its compounds): 2(CH3)2SiCl2 (CH3)3SiCl + CH3SiCl3.
These products constitute the tank resudues that boil above 143 °C. 3. After loading the reactor with contact mass, electrical heating is switched on and at 200 °C nitrogen is fed through the heater. Thus, the mass is 46 2. Chemistry and technology of silicone monomers dried for 5-6 hours, and then the temperature is raised to 300 °ɋ. 5 MPa. The synthesis forms a mixture of 60-80% of ethylchlorosilanes and 2040% of unreacted ethylchloride. This mixture (condensate) is then sent to rectification.