Continuous production process of polydimethylsiloxane

A technology for the preparation of polydimethylsiloxane, which is applied in the field of continuous preparation of polydimethylsiloxane, and can solve the problem of cumbersome polydimethylsiloxane process steps, low product quality, and long reaction time and other issues to achieve high production efficiency, lower production costs, and stable quality

Pending Publication Date: 2019-12-10
TANGSHAN SANYOU SILICON IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the production process of polydimethylsiloxane, it is widely used in the industry to prepare polydimethylsiloxane (D4 or DMC) and hexamethyldisiloxane by batch reaction of low molar mass. However, the process steps for preparing polydimethylsiloxane by this method are cumbersome, the reaction time is long, and other impurities are contained in the reaction product, and the product quality is low

Method used

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  • Continuous production process of polydimethylsiloxane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A continuous preparation process of polydimethylsiloxane, carried out as follows:

[0026] Raw material feed ratio is as follows:

[0027] Hexamethyldisiloxane: 5.8kg / h; siloxane mixed ring body 619kg / h; the mass ratio of hexamethyldisiloxane to siloxane mixed ring body is 1:106.7.

[0028] A. Raw material pretreatment: the siloxane mixed ring body is dehydrated through the thin film evaporator-1 and the desiccant fixed bed 2, and the metal ions are removed through the activated carbon fixed bed 3 and the ion exchange resin bed 4, and the thin-film evaporator-1 The operating temperature is 70°C and the vacuum degree is -0.08Mpa.

[0029] B. Preheating: Hexamethylsiloxane and siloxane mixed rings are mixed in a static mixer at a mass ratio of 1:106.7, and then enter the preheater 5 to preheat to 80°C.

[0030] C. Telomerization: After preheating, the material enters the tube reactor 6 for equilibrium reaction, and the tube is filled with cationic acid resin, the reacti...

Embodiment 2

[0036] Raw material feed ratio is as follows:

[0037] Hexamethyldisiloxane: 11kg / h; siloxane mixed ring body 614kg / h; the mass ratio of hexamethyldisiloxane to siloxane mixed ring body is 1:55.8.

[0038] A. Raw material pretreatment: the siloxane mixed ring body is dehydrated through the thin film evaporator-1 and the desiccant fixed bed 2, and the metal ions are removed through the activated carbon fixed bed 3 and the ion exchange resin bed 4, and the thin-film evaporator-1 The operating temperature is 70°C and the vacuum degree is -0.08Mpa.

[0039] B. Preheating: Hexamethylsiloxane and siloxane mixed rings are mixed in a static mixer at a mass ratio of 1:55.8, and then enter a preheater to preheat to 80°C.

[0040] C. Telomerization: After preheating, the material enters the tube reactor 6 for equilibrium reaction, and the tube is filled with cationic acid resin, the reaction temperature is 80°C, and the reaction residence time is 1 hour.

[0041] D. Purification: After...

Embodiment 3

[0046] Hexamethyldisiloxane: 9kg / h; siloxane mixed ring body 619kg / h; the mass ratio of hexamethyldisiloxane to siloxane mixed ring body is 1:68.7.

[0047] A. Raw material pretreatment: the siloxane mixed ring body is dehydrated through the thin film evaporator-1 and the desiccant fixed bed 2, and the metal ions are removed through the activated carbon fixed bed 3 and the ion exchange resin bed 4, and the thin-film evaporator-1 The operating temperature is 70°C and the vacuum degree is -0.08Mpa.

[0048] B. Preheating: Hexamethylsiloxane and siloxane mixed rings are mixed in a static mixer at a mass ratio of 1:68.7, and then enter a preheater to preheat to 80°C.

[0049] C. Telomerization: After preheating, the material enters the tube reactor 6 for equilibrium reaction, and the tube is filled with cationic acid resin, the reaction temperature is 80°C, and the reaction residence time is 1 hour.

[0050] D. Purification: After telomerization, the silicone oil passes through t...

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Abstract

The invention relates to a production process of dimethylsiloxane, in particular to a continuous preparation process of polydimethylsiloxane. A siloxane hybrid ring is subjected to water removing through a first film evaporator and a drying agent fixed bed and subjected to metal ion removing through an activated carbon fixed bed and an ion exchange resin bed; hexamethylsiloxane and the siloxane hybrid ring are mixed by a static mixer according to the mass ratio of 1:(2 to 200), and then a mixture enters a preheater to be preheated to 70-90 DEG C; a preheated material enters a tubular reactor to be subjected to an equilibrium reaction, row tubes are filled with catalysts, the reaction temperature is 70-90 DEG C, and the reaction residence time is 0.5-2 hours; residual acidic materials and other impurities are adsorbed through a filter device; low molecules are removed through a second film evaporator, the vacuum degree is 0 to minus 0.099 MPa, and the degreasing temperature is 150-250 DEG C; and a finished product with the low molecules removed is cooled, then filtered and packaged. The production efficiency is significantly improved, and the product quality is stabilized.

Description

technical field [0001] The invention relates to a production process of dimethylsiloxane, in particular to a continuous preparation process of polydimethylsiloxane. Background technique [0002] In the production process of polydimethylsiloxane, it is widely used in the industry to prepare polydimethylsiloxane (D4 or DMC) and hexamethyldisiloxane by batch reaction of low molar mass. However, the process steps for preparing polydimethylsiloxane by this method are cumbersome, the reaction time is long, and other impurities are contained in the reaction product, so the product quality is low. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention proposes a continuous preparation process of polydimethylsiloxane with high efficiency and good product quality. [0004] The present invention adopts following technical scheme: [0005] A continuous preparation process for polydimethylsiloxane, comprising the steps of: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/04C08G77/06
CPCC08G77/04C08G77/06
Inventor 任海涛刘彬赵洁曹鹤李献起张鹏硕刘秋艳严锦河赵磊胡质云赵景辉倪志远刘思佳崔磊高金明
Owner TANGSHAN SANYOU SILICON IND
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