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Synthesis of Dimethyldichlorosilane by Catalytic Disproportionation of Methyltrichlorosilane Over Acid Activated Bentonites

Author: AoZhiYong
Tutor: ZhangNing
School: Nanchang University
Course: Industrial Catalysis
Keywords: Dimethyldichlorosilane Methyltrichlorosilane Acidified bentonite Catalytic disproportionation B acid L acid
CLC: TQ264.1
Type: Master's thesis
Year: 2011
Downloads: 40
Quote: 0
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Abstract


With the rapid development of organic silicon industry , types of silicone products is increasing , also widely known as \However, the monomer production of chlorotrimethylsilane is the basis for the entire silicone industry . In using the direct method the process of production of dimethyldichlorosilane ((CH3) 2SiCl2) , wherein about 3-15% of the methyl trichlorosilane (CH3SiCl3) byproducts generated. To solve byproduct CH3SiCl3 's cumulative problem CH3SiCl3 catalytic disproportionation Preparation of ( CH3 ) 2SiCl2 be considered is the best solution , not only can solve the ( CH3 ) worries accumulated by 2SiCl2 the production of by-products , and recycling of resources can be achieved . The selection of this thesis bentonite as a catalyst, by using different concentrations of HCl of H2SO4 on bentonite acidified modified to optimize the specific surface area of the bentonite , acidic , and structural properties . By inductively coupled plasma atomic emission spectroscopy ( ICP - AES) , X - ray powder diffraction (XRD), N2 adsorption - desorption (N2Adsorption-desorption) and infrared spectroscopy (FTIR) to characterize the catalysts . The results show that the acid treatment of the composition of bentonite apparent physical properties and structure have a greater impact , with the increase of acid concentration , the specific surface area of bentonite first increases and then decreases , 30% sulfuric acid treated bentonite than the surface area of ??341m2 · g -1, and the bentonite a layered structure in the high acid concentration occurs collapse; by NH3 temperature programmed desorption (NH3-TPD) and pyridine infrared spectroscopy acidified bentonite acidic , experimental results show that the acid treatment can be adjusted for different concentrations of change the distribution of the acid sites and the number of acid sites bentonite . In addition , elevated temperatures can be the B acid L acid change in the bentonite . We explore the atmospheric pressure acidification the Bentonite catalytic disproportionation CH3SiCl3 of the catalytic performance , acid concentration and reaction temperature on the catalytic activity , activity results show that after a 30% concentration of H2SO4 treatment bentonite catalyst , atmospheric pressure , at 673K best catalytic performance CH3SiCl3 conversion rate of 92 % , ( CH3) 2SiCl2 selectivity of up to 45% , the yield was 41 % . The study also found that the B acid sites there is conducive to ( CH3 ) 2SiCl2 the formation of B acid sites and L acid sites coexist with conducive ( CH3 ) 2SiCl2 yield improve .

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of organic compounds of elements > The first IV group elements, organic compounds , > Silicon organic compounds
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