Preparation process and device of methyltrimethoxysilane

A technology of methyltrimethoxysilane and monomethyltrichlorosilane, which is applied in the field of preparation process and device of methyltrimethoxysilane, can solve the problems of the yield decline of methyltrimethoxysilane and reduce the cost of raw materials and equipment investment cost, reduce the risk of introducing impurity substances, and the effect of uniform liquid mixing

Pending Publication Date: 2021-12-31
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogen chloride gas generated during the reaction process of this method is easily soluble in anhydrous methanol, thereby releasing a large amount of heat. At the same time, hydrogen chloride and methanol will produce side reactions: HCl+CH 3 OH→CH 3 Cl+H 2 O, the water produced will react with the main raw material, methyltrichlorosilane, and the yield of methyltrimethoxysilane will decrease.

Method used

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  • Preparation process and device of methyltrimethoxysilane
  • Preparation process and device of methyltrimethoxysilane
  • Preparation process and device of methyltrimethoxysilane

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation device for methyltrimethoxysilane, the mixer 1 is connected to the Venturi mixer 2, the Venturi mixer 2 is connected to the heat exchanger 3, the heat exchanger 3 is connected to the gas-liquid separation tank 4, and the gas-liquid separation The tank 4 is connected to the top of the stripper 5, the bottom of the stripper 5 is connected to the rectification tower 9, the rectification tower 9 is connected to the product tank, and the bottom of the stripper 5 is provided with a connecting pipe of the preheater 6.

[0030] Three mixing chambers are arranged in the Venturi mixer 2, the second mixing chamber 11 and the third mixing chamber 12

[0031] The joints of the joints are provided with variable-diameter pipes, that is, the diameter of the joints is 200 mm, and the diameter of the feed end of the second mixing chamber 11 and the discharge end of the third mixing chamber 12 is 350 mm; the first mixing chamber 10 and the second mixing chamber A baffle 13 i...

Embodiment 2

[0035] The process of the present invention that adopts the structure of the Venturi mixer of the above-mentioned embodiment 1 is carried out only in the number of holes in the Venturi mixture, the distance from the holes to the edge of the baffle a, the center of the baffle from the center of the hole b, and the inner diameter of the hole c. adjustments, as follows:

[0036] (1) Prepare monomethyltrichlorosilane A and methanol B with a molar ratio of 1:2.5, monomethyltrichlorosilane A and n-hexane with a mass ratio of 1:0.6 as raw materials, add methanol B and n-hexane to the mixer After mixing evenly, the mixed solution of monomethyltrichlorosilane A and the mixer is simultaneously pumped into the Venturi with internal pressure of 0.2MPa, internal diameter a=300mm, b=80mm, c=25mm, and 12 holes at 25°C for mixing In the container, the two are fully mixed and reacted;

[0037] (2) After the reaction product is exchanged by the heat exchanger, the temperature is kept at 30°C a...

Embodiment 3

[0042] The process of the present invention that adopts the structure of the Venturi mixer of the above-mentioned embodiment 1 is carried out only in the number of holes in the Venturi mixture, the distance from the holes to the edge of the baffle a, the center of the baffle from the center of the hole b, and the inner diameter of the hole c. adjustments, as follows:

[0043] (1) Prepare monomethyltrichlorosilane A and methanol B with a molar ratio of 1:2.6, monomethyltrichlorosilane A and n-hexane with a mass ratio of 1:0.5 as raw materials, and add methanol B and n-hexane to the mixer After mixing evenly, the mixed solution of monomethyltrichlorosilane A and the mixer is simultaneously pumped into the Venturi with internal pressure of 0.2MPa, internal diameter a=350mm, b=90mm, c=30mm, and 12 holes at 25°C for mixing In the container, the two are fully mixed and reacted;

[0044] (2) After the reaction product is exchanged by the heat exchanger, the temperature is kept at 35...

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Abstract

The invention provides a preparation process and device of methyltrimethoxysilane. Methanol and a solvent are added into a mixer according to a ratio and are uniformly mixed, and then methyl trichlorosilane and a mixed solution in the mixer simultaneously enter a Venturi mixer according to a ratio and are mixed and reacted; a reaction product enters a gas-liquid separation tank after being subjected to heat exchange through a heat exchanger, and hydrogen chloride gas is discharged after passing through a demister above the gas and enters a hydrogen chloride absorption device for absorption treatment; residual liquid flows into the top of a stripping tower from the lower end of the gas-liquid separation tank; methyl alcohol is heated into steam through a preheater and then enters the bottom of the stripping tower for reaction, and a methyltrimethoxysilane crude product is obtained at the bottom of the stripping tower; mixed gas generated at the top of the stripping tower enters a condenser for condensation separation and then enters a hydrogen chloride absorption device for absorption treatment; and the solvent condensed by the condenser returns to the solvent for recycling, and the methyltrimethoxysilane crude product enters a rectifying tower to be purified, so that methyltrimethoxysilane with the content of more than 99.6% and the Cl<-> content of less than 50ppm can be obtained.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a preparation process and device of methyltrimethoxysilane. Background technique [0002] Methyltrimethoxysilane ([CH 3 Si(OCH 3 ) 3 ], referred to as MTMS) is an important silane coupling agent in methylalkoxysilane, mainly used as a crosslinking agent for dealcoholized silicone sealant, as well as a surface treatment agent for glass fiber and reinforced plastic laminates. External treatment agent, synthetic methylcyclohexyldimethoxysilane. Because of its unique properties, methyltrimethoxysilane is widely used in various fields such as aviation, aerospace, military, medicine and health, and civil use. The main synthesis methods of methyltrimethoxysilane are: Grignard method, alcoholysis method, sodium condensation method, etc. At present, the most widely used method in China is alcoholysis method. The patent application number is 200810048996.8, whi...

Claims

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Application Information

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IPC IPC(8): C07F7/18C07F7/20
CPCC07F7/1804C07F7/188C07F7/20Y02P20/10
Inventor 李书兵王文金姚中鹏杜宏伟刘畅辛梓杰万勇匡建国
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD
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