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A kind of method utilizing low-boiling disproportionation residue to prepare low-boiling silicone oil

A technology of raffinate and boiling silicon, applied in the field of preparation of low-boiling silicone oil, can solve the problems of cracking raffinate, waste, hazardous waste and other problems, and achieve the effects of improving economic efficiency, reducing waste rate and reducing cost

Active Publication Date: 2020-05-12
ZHENJIANG JIANGNAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the direct method is generally used to prepare methylchlorosilane monomers, and some by-products will be produced in the production process, such as organosilicon high-boilers and low-boilers, and low-boilers can prepare methylchlorosilanes through disproportionation reactions. However, Even so, after pyrolysis of low boilers, there is still pyrolysis residual liquid. This part of the substance is hazardous waste and cannot be well utilized. There is a certain waste, which is not conducive to energy conservation and environmental protection.

Method used

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  • A kind of method utilizing low-boiling disproportionation residue to prepare low-boiling silicone oil
  • A kind of method utilizing low-boiling disproportionation residue to prepare low-boiling silicone oil

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Experimental program
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Effect test

Embodiment 1

[0021] A method for preparing low-boiling silicone oil by utilizing low-boiling disproportionation raffinate, the steps are as follows:

[0022] (1) obtaining low boiling raffinate after separating dimethyl dichlorosilane in the product after the disproportionation of low boilers;

[0023] (2) Add the low boiling residue to the flash tank for flash evaporation, flash at a pressure of 50kg and a temperature of 62°C, and collect the trimethylchlorosilane in the low boiling residue;

[0024] (3) Raise the temperature to 100° C., continue to flash under a pressure of 50 kg, and collect monomethyltrichlorosilane in the low boiling residue to obtain mixture A;

[0025] (4) Add the trimethylchlorosilane collected in step (2) to mixture A to obtain mixture B, so that the content of monomethyltrichlorosilane in mixture B is 2wt%, and the content of trimethylchlorosilane is 11wt %, the trimethylchlorosilane in the mixture B is used as an end-capping agent;

[0026] (5) The mixture B i...

Embodiment 2

[0028] A method for preparing low-boiling silicone oil by utilizing low-boiling disproportionation raffinate, the steps are as follows:

[0029] (1) obtaining low boiling raffinate after separating dimethyl dichlorosilane in the product after the disproportionation of low boilers;

[0030] (2) Add the low boiling residue to the flash tank for flash evaporation, flash at a pressure of 45kg and a temperature of 60°C, and collect the trimethylchlorosilane in the low boiling residue;

[0031] (3) Raise the temperature to 90° C., continue to flash under a pressure of 45 kg, and collect monomethyltrichlorosilane in the low boiling residue to obtain mixture A;

[0032] (4) Add the trimethylchlorosilane collected in step (2) into mixture A to obtain mixture B, so that the content of monomethyltrichlorosilane in mixture B is 3wt%, and the content of trimethylchlorosilane is 10wt %, the trimethylchlorosilane in the mixture B is used as an end-capping agent;

[0033] (5) The mixture B ...

Embodiment 3

[0035] A method for preparing low-boiling silicone oil by utilizing low-boiling disproportionation raffinate, the steps are as follows:

[0036] (1) obtaining low boiling raffinate after separating dimethyl dichlorosilane in the product after the disproportionation of low boilers;

[0037] (2) Add the low boiling residue to the flash tank for flash evaporation, flash at a pressure of 55kg and a temperature of 65°C, and collect the trimethylchlorosilane in the low boiling residue;

[0038] (3) Raise the temperature to 110° C., continue to flash under a pressure of 55 kg, and collect monomethyltrichlorosilane in the low boiling residue to obtain mixture A;

[0039] (4) Add the trimethylchlorosilane collected in step (2) into mixture A to obtain mixture B, so that the content of monomethyltrichlorosilane in mixture B is 1wt%, and the content of trimethylchlorosilane is 12wt %, the trimethylchlorosilane in the mixture B is used as an end-capping agent;

[0040] (5) The mixture B...

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Abstract

The invention relates to a method for preparing low-boiling point silicone oil from low-boiling point disproportionation raffinate. The method comprises the following steps: 1, separating dimethyl dichlorosilane from a low-boiling-point substance disproportionated product to obtain low-boiling point raffinate; 2, adding the low-boiling point raffinate into a flash evaporation tank, carrying out flash evaporation, and collecting trimethylchlorosilane from the low-boiling point raffinate; 3, continuously carrying out flash evaporation at a rising temperature of 90-110 DEG C under a pressure of 45-55 kg, and collecting monomethyltrichlorosilane from the low-boiling point raffinate to obtain a mixture A; 4, adding the trimethylchlorosilane collected in step 2 to the mixture A in order to obtain a mixture B; and 5, hydrolyzing the mixture B to obtain the low-boiling point silicone oil. The low-boiling point raffinate generated after low-boiling-point substance disproportionation is continuously used to produce the low-boiling point silicone oil, so the economy efficiency is improved, the energy efficiency is saved, and the cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing low-boiling silicone oil, in particular to a method for preparing low-boiling silicone oil by using low-boiling disproportionation raffinate. Background technique [0002] Organosilicon materials are a kind of semi-inorganic and semi-organic macromolecular compounds with Si‐O bonds as the main chain and organic groups introduced as side chains on Si atoms. They have both organic polymers and inorganic polymers. Features, that is, it has the excellent properties of inorganic silica such as safety, reliability, non-toxic, non-polluting, non-corrosive, high temperature resistance, ozone resistance, radiation resistance, aging resistance, flame resistance, long life and physiological inertness, as well as moisture-proof and repellent Excellent quality of organic polymers such as water, easy processing, and easy modification. It is widely used in military industry, aerospace, medical treatment, chemical indus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/06
CPCC08G77/06
Inventor 杨中群魏利孟庆曦刘俊廖端友田玉龙
Owner ZHENJIANG JIANGNAN CHEM