Preparation method of hexamethyl disiloxane

A technology of hexamethyldisiloxane and trimethylmonochlorosilane, which is applied in the field of preparation of hexamethyldisiloxane, can solve problems such as low production efficiency, difficult product separation, and low product yield, and achieve The effect of low production cost, simple process operation and high product yield

Inactive Publication Date: 2009-02-11
JIANGSU HONGDA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, hexamethyldisiloxane is mainly produced by hydrolysis method, that is, trimethylmonochlorosilane is hydrolyzed under acidic conditions to generate hexamethyldisiloxane and dilute hydrochloric acid. This method has low production efficiency and low product quality. The yield is low and th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] Raw materials

[0026] The mass ratio of trimethylmonochlorosilane is 100 parts and the weight is 217g,

[0027] The mass ratio of sodium carbonate is 50 parts, the weight is 106g,

[0028] The mass ratio of hexamethyldisiloxane is 20 parts and the weight is 43.4g.

[0029] First add measured 43g of hexamethyldisiloxane and 106g of sodium carbonate into the reaction kettle, turn on the stirring, and at the same time drop the measured 217g of trimethylmonochlorosilane into the reaction kettle by dripping, the reaction temperature is normal temperature, Adjust and control the dropping rate according to the change of reaction temperature. Gas will be released during the reaction. When the dropping is completed and the stirring is continued until no gas is generated, stop stirring to test the pH value of the material. When the pH value is 6.0-8.0, the reaction is complete and the reaction is stopped. ; Cooling, centrifugal filtration (solid-liquid separation)...

Example Embodiment

[0031] Example 2

[0032] Raw materials

[0033] The mass ratio of trimethylmonochlorosilane is 100 parts and the weight is 217g,

[0034] The mass ratio of potassium carbonate is 100 parts and the weight is 217g,

[0035] The mass ratio of hexamethyldisiloxane is 200 parts and the weight is 434g.

[0036] Centrifugal filtration Centrifugal speed 1200 rpm,

[0037] Steam and dry control temperature 150 ℃.

[0038] When producing, first add the measured 434g of hexamethyldisiloxane and 217g of potassium carbonate into the reaction kettle, turn on the stirring, and at the same time drop the measured 217g of trimethylmonochlorosilane into the reaction kettle in a dropwise manner The reaction temperature is normal temperature. Adjust and control the dropping rate according to the change of reaction temperature. During the reaction, gas will be released. When the dropping is completed and the stirring is continued until no gas is generated, stop stirring and test the pH value of the ma...

Example Embodiment

[0040] Example 3

[0041] Raw materials

[0042] The mass ratio of trimethylmonochlorosilane is 100 parts and the weight is 217g,

[0043] The mass ratio of potassium carbonate is 75 parts and the weight is 162.8g,

[0044] The mass ratio of hexamethyldisiloxane is 100 parts and the weight is 217g.

[0045] Centrifugal filtration Centrifugal speed 1200 rpm,

[0046] Steam and dry control temperature 150 ℃.

[0047] During production, first add 217g of hexamethyldisiloxane and 162.8g of potassium carbonate measured into the reactor, turn on the stirring, and at the same time, add the measured 217g of trimethylmonochlorosilane into the reactor in a dropwise manner. The reaction temperature is normal temperature. Adjust and control the dropping speed according to the change of reaction temperature. Gas will be released during the reaction. When the dropping is completed and the stirring is continued until no gas is generated, stop stirring to test the pH value of the material, and th...

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PUM

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Abstract

The invention relates to the field of organic chemistry, in particular to a preparation method for hexamethyldisiloxane, which is characterized in that: non-toxic and harmless carbonate is taken as a solid state reactant, trimethyl chloro silicane is taken as a liquid state reactant and hexamethyldisiloxane is taken as a reaction solvent; and the hexamethyldisiloxane is synthesized by liquid-solid reaction. The preparation method is simple and can react under mild conditions that only require normal temperature and normal pressure; reaction products can be obtained by simple solid-liquid separation.

Description

technical field [0001] The invention relates to the field of organic chemistry, in particular to a preparation method of hexamethyldisiloxane. Background technique [0002] Hexamethyldisiloxane is mainly used in the production of organic chemical industry and pharmaceutical chemical industry. At present, hexamethyldisiloxane is mainly produced by hydrolysis method, that is, trimethylmonochlorosilane is hydrolyzed under acidic conditions to generate hexamethyldisiloxane and dilute hydrochloric acid. This method has low production efficiency and low product quality. The yield is low, the quality is poor, and the acid concentration produced during the production process is low and contains a small amount of organic waste water, so the product separation is relatively difficult, and the environmental pollution is also relatively serious, thus limiting the further development of production. Contents of the invention [0003] The invention discloses a new preparation method of ...

Claims

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Application Information

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IPC IPC(8): C07F7/18
Inventor 祝纪才朱德洪朱恩俊
Owner JIANGSU HONGDA NEW MATERIAL
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