Preparation method and preparation equipment of phenyltrimethoxysilane
A technology of phenyltrimethoxysilane and phenyltrichlorosilane, which is applied in the field of preparation of phenyltrimethoxysilane, can solve the problems of reduced recovery rate of hydrogen chloride gas, complicated reaction system, complicated preparation method, etc. Possibility to produce side reactions, simple steps, and low manufacturing costs
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 remove the hydrogen chloride gas in time, but it is necessary to Adding other substances to the esterification reaction system for neutralization reaction makes the reaction system more complicated. In addition, after adding other substances for neutralization reaction, the recycling rate of hydrogen chloride gas is greatly reduced, and the cost is increased.
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[0031] Below in conjunction with accompanying drawing, the present invention will be further described with specific embodiment, see Figure 1-5 :
[0032] A preparation method of phenyltrimethoxysilane, characterized in that: comprising the following steps:
[0033] Methanol is transported to the bottom of the esterification tower 3 by the methanol feed pump after being metered by the first rotameter, and the phenyltrichlorosilane monomer is metered by the monomer feed pump by the second rotameter and then sent to the top of the esterification tower 3 ; Methanol and phenyltrichlorosilane monomer carry out countercurrent esterification reaction in esterification tower 3; The hydrogen chloride gas produced after the esterification reaction is discharged by esterification tower 3 top, generates phenyltrimethoxysilane crude product and stays in esterification The bottom of the tower 3 is pumped to the rectification tower 4 for rectification and separation through the middle. Aft...
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Abstract
The invention discloses a preparation method of phenyltrimethoxysilane. The technical scheme includes that the preparation method includes the steps of delivering methanol to the bottom of an esterification column while delivering phenyl trichlorosilane monomer to the top of the esterification column; subjecting methanol and phenyl trichlorosilane monomer to counter-current esterification reactionin the esterification column to obtain hydrogen chloride gas and a phenyltrimethoxysilane crude product; discharging the hydrogen chloride gas from the top of the esterification column while retaining the phenyltrimethoxysilane crude product at the bottom of the esterification column and sending the crude product into a rectifying column through an intermediate pump, performing rectification separation to obtain the qualified phenyltrimethoxysilane product and high-boiling residues; introducing the hydrogen chloride gas into a falling film absorber to produce hydrochloric acid with the concentration being 31%, pumping the hydrochloric acid into a reactor, adding aluminium hydroxide with stirring to perform a temperature reaction, pumping reaction products into a crystallization kettle, and performing vacuum crystallization to obtain a crystallized alchlor finished product. The preparation method has the advantages of being simple, high in efficiency and high in yield and realizing effective utilization of by products, and is adaptable to the technical field of chemical engineering.
Description
technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a preparation method of phenyltrimethoxysilane. Background technique [0002] Phenyltrimethoxysilane is mainly used as a raw material for the preparation of polymer organosilicon compounds. Phenyltrimethoxysilane is obtained by the esterification reaction of phenyltrichlorosilane and methanol, and its reaction equation is C 6 h 5 SiCl 3 +3CH 3 OH====C 6 h 5 Si(OCH 3 ) 3 +3HCl. 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 remove the hydrogen chloride gas in time, but it is necessary to Adding other substances to the esterification reaction system for neutralization reaction makes the reaction system more comp...
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IPC IPC(8): C07F7/18C07F7/20
Inventor 方江北
Owner 浙江正和硅材料有限公司