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Method for preparing diphenyldimethoxysilane by continuous alcoholysis method

A technology of diphenyldimethoxysilane and diphenyldichlorosilane, which is applied in the field of preparing diphenyldimethoxysilane by continuous alcoholysis method, can solve the problem of high energy consumption, difficulty in solvent recovery and unsuitable for industrial production And other issues

Active Publication Date: 2021-09-14
JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing preparation methods are relatively complicated, some need to add auxiliary agents such as acid-binding agents and catalysts, and some need solvent methods or acid absorption methods to remove HCl
Due to the influence of by-products, in order to separate products, the existing reaction systems mostly use single or multiple reactors. After the alcoholysis reaction, rectification or distillation is required to separate products, which requires complex physical and chemical processes, resulting in equipment efficiency. Low energy consumption, high production cost, difficult solvent recovery, not suitable for large-scale industrial production

Method used

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  • Method for preparing diphenyldimethoxysilane by continuous alcoholysis method
  • Method for preparing diphenyldimethoxysilane by continuous alcoholysis method

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Embodiment 1

[0057] A method for preparing diphenyldimethoxysilane by continuous alcoholysis, specifically comprising the steps of:

[0058] (1) Methanol vaporization: After methanol is vaporized in stages by the vaporization tower, it is used as a reactant and a heat source, and enters the alcoholysis tower, where it undergoes alcoholysis reaction with diphenyldichlorosilane. The vaporization tower is divided into two vaporization areas. The temperature of the first vaporization area is 55°C, which is used to recover the initial temperature of methanol. Impurities can also save energy consumption.

[0059] (2) Continuous alcoholysis: Check the vacuum degree of the system, open the alcoholysis tower 1 methanol feed, add gas phase methanol according to the feed rate of 20.5 kg / hour, and add diphenyldichlorosilane into the alcoholysis tower according to 80 kg / hour , through the reboiler 2 valve opening, the temperature at the bottom of the alcoholysis tower is controlled at 130 ° C, the tem...

Embodiment 2

[0066] A method for preparing diphenyldimethoxysilane by continuous alcoholysis, specifically comprising the steps of:

[0067] (1) Methanol vaporization: After methanol is vaporized in stages by the vaporization tower, it is used as a reactant and a heat source, and enters the alcoholysis tower, where it undergoes alcoholysis reaction with diphenyldichlorosilane. The vaporization tower is divided into two vaporization areas. The temperature of the first vaporization area is 55°C, which is used to recover the initial temperature of methanol. Impurities can also save energy consumption.

[0068] (2) Continuous alcoholysis: open the alcoholysis tower 1 methanol feed, add vaporized methanol according to the feed rate of 20.5 kg / hour, and add diphenyldichlorosilane into the alcoholysis tower according to 80 kg / hour, pass through the reboiler 2 The valve opening controls the temperature at the bottom of the alcoholysis tower to 120°C, the temperature at the top of the alcoholysis ...

Embodiment 3

[0074] A method for preparing diphenyldimethoxysilane by continuous alcoholysis, specifically comprising the steps of:

[0075] (1) Methanol vaporization: After methanol is vaporized in stages by the vaporization tower, it is used as a reactant and a heat source, and enters the alcoholysis tower, where it undergoes alcoholysis reaction with diphenyldichlorosilane. The vaporization tower is divided into two vaporization areas. The temperature of the first vaporization area is 55°C, which is used to recover the initial temperature of methanol. Impurities can also save energy consumption.

[0076] (2) Continuous alcoholysis: Check the vacuum degree of the system, open the alcoholysis tower 1 methanol feed, add vaporized methanol according to the feed rate of 20.5 kg / hour, and when the temperature at the top of the alcoholysis tower 1 shows 50°C, use 80 kg Add diphenyldichlorosilane to the alcoholysis tower per hour, adjust the vacuum, control the bottom temperature of the alcoho...

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Abstract

The invention provides a method for preparing diphenyldimethoxysilane by a continuous alcoholysis method. The method comprises the following steps: (1) vaporizing methanol; (2) conducting continuous alcoholysis: vaporized methanol and diphenyl dichlorosilane continuously enter an alcoholysis tower, and the vaporized methanol and diphenyl dichlorosilane are subjected to an alcoholysis reaction in a countercurrent manner; (3) conducting methanol reflux; (4) absorbing hydrogen chloride; (5) washing the crude product: the crude product is washed with methanol; and (6) collecting a finished product. Methanol is vaporized to form a reactant with a heat source, the reactant and diphenyl dichlorosilane are subjected to an alcoholysis reaction, the reaction rate is increased, a crude product is washed with methanol, free chlorine is dissolved, and methanol is recycled, cyclically vaporized and enters an alcoholysis tower to serve as a raw material to participate in the reaction, so that a continuous alcoholysis process is formed. An acid-binding agent is avoided while a rectification device is reduced, so that the production cost and the equipment energy consumption are reduced, waste is reduced, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of organosilicon production, and in particular relates to a method for preparing diphenyldimethoxysilane by continuous alcoholysis. Background technique [0002] Diphenyldimethoxysilane is an important organosilicon compound, which is used to produce phenyl silicone oil, phenyl silicone resin, phenyl silicone rubber, etc. It can also be used as a cocatalyst for regulating polypropylene in the polymerization of propylene. [0003] There are two traditional synthesis methods of diphenyldimethoxysilane: one-step method and two-step method. The one-step method is to put the two raw materials of diphenyldichlorosilane and excess methanol into the reactor at one time, and directly obtain the target product without taking out the intermediate. The two-step method is to react diphenyldichlorosilane and methanol equimolarly to obtain an intermediate diphenylmethoxychlorosilane, and then react the intermediate with methanol to...

Claims

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Application Information

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IPC IPC(8): C07F7/18C07F7/20
CPCC07F7/188C07F7/20
Inventor 廖立颜岭王海栋黄晓辉
Owner JIANGXI BLUESTAR XINGHUO SILICONE CO LTD