Diphenyldimethoxysilane preparation method and preparation device
A technology of diphenyldimethoxysilane and diphenyldichlorosilane, which is applied in the field of preparation of diphenyldimethoxysilane, can solve problems such as complex reaction system, complicated preparation method, and increased cost, and achieve The steps are simple, the possibility of side reactions is reduced, and the structure is simplified
Active Publication Date: 2019-05-24
浙江正和硅材料有限公司
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Problems solved by technology
The existing preparation methods are relatively complicated, with low efficiency and low yield. For example, if the hydrogen chloride gas produced by the reaction is not discharged in time, it is easy to produce side reactions with other reactants and produce by-products. Therefore, it is necessary to discharge the hydrogen chloride gas in time, but it is necessary to Adding other substances for neutralization reaction makes the reaction system more complicated and the cost increases
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[0027] The present invention will be further described below with specific embodiments in conjunction with the drawings, see Figure 1-5 :
[0028] A preparation method of diphenyldimethoxysilane, characterized in that it comprises the following steps:
[0029] Methanol is measured by the methanol feed pump through the first rotor flow meter and then delivered to the bottom of the esterification tower 3. Diphenyldichlorosilane monomer is metered by the monomer feed pump through the second rotor flow meter and then delivered to the esterification tower 3 Top; methanol and diphenyldichlorosilane monomers undergo countercurrent esterification reaction in the esterification tower 3; the hydrogen chloride gas produced after the esterification reaction is discharged from the top of the esterification tower 3 to generate crude diphenyldimethoxysilane Left at the bottom of the esterification tower 3, and sent to the rectification tower 4 through the middle pump for rectification separatio...
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The invention discloses a diphenyldimethoxysilane preparation method. The technical scheme is characterized in that the method includes steps: methyl alcohol is measured by a first rotor flow meter through a methyl alcohol feeding pump and then conveyed to the bottom of an esterification tower; diphenyldichlorosilane monomers are measured by a second rotor flow meter through a monomer feeding pumpand then conveyed to the top of the esterification tower; methyl alcohol and the diphenyldichlorosilane monomers are subjected to countercurrent esterification reaction in the esterification tower; hydrogen chloride gas produced after esterification reaction is discharged from the top of the esterification tower, a generated crude product of diphenyldimethoxysilane is left at the bottom of the esterification tower and sent through an intermediate pump to a rectifying tower for rectifying and separation, an acceptable product of diphenyldimethoxysilane is obtained at the top of the rectifyingtower after rectification, and high-boiling residues are obtained at the bottom of the rectifying tower. The method is applicable to the technical field of the chemical industry and has advantages ofsimplicity, high efficiency and high yield.
Description
Technical field [0001] The invention belongs to the technical field of chemical engineering, and specifically refers to a preparation method of diphenyldimethoxysilane. Background technique [0002] Diphenyldimethoxysilane is mainly used in the polymerization of propylene and acts as a catalyst to improve isotacticity. Diphenyldimethoxysilane is obtained by the esterification reaction of diphenyldichlorosilane and methanol. The reaction equation is (C 6 H 5 ) 2 SiCl 2 +2CH 3 OH ====(C 6 H 5 ) 2 Si(OCH 3 ) 2 +2HCl. The existing preparation methods are complicated, with low efficiency and low yield. For example, if the hydrogen chloride gas produced by the reaction is not discharged in time, it is easy to produce side reactions with other reactants and produce by-products. Therefore, the hydrogen chloride gas needs to be discharged in time, but it needs Adding other substances for neutralization reaction makes the reaction system more complicated and the cost increases. Summary o...
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Login to View More IPC IPC(8): C07F7/18C07F7/20
Inventor 方江北
Owner 浙江正和硅材料有限公司