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Separation device and separation method for removing silicon tetrachloride in organosilicon monomer azeotrope

A silicon tetrachloride and separation device technology, applied in organic chemistry, silicon organic compounds, chemical instruments and methods, etc., can solve the problems of small boiling point gap, product purity not meeting the expected requirements, equipment and pipeline blockage, etc. Achieve the effects of improving purity, reducing cooling water and steam consumption, and reducing load

Pending Publication Date: 2020-12-04
XINTE ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And in the difficulty of separating and purifying methyl chlorosilane, except that the difference in boiling point between the components is less, mainly there is the azeotropic problem between trimethyl chlorosilane and methyl hydrosilane and silicon tetrachloride (three The boiling point of methyl monochlorosilane: 57.9°C, 101KPa; the boiling point of silicon tetrachloride is 57.6°C, 101KPa), so that the purity of the product after separation cannot meet the expected requirements. At the same time, in the hydrolysis process, silicon tetrachloride and water react to produce The solid substance of silica will cause unfavorable factors such as equipment and pipeline blockage for a long time

Method used

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  • Separation device and separation method for removing silicon tetrachloride in organosilicon monomer azeotrope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a separation device for removing silicon tetrachloride from the azeotrope of organosilicon monomer, and directly synthesizes methylchlorosilane monomer to obtain the crude product of methylchlorosilane monomer, methylchlorosilane monomer The crude product undergoes primary rectification to remove high boilers and low boilers to obtain organosilicon monomer azeotropes, which include: trimethylchlorosilane and silicon tetrachloride. The separation device include:

[0032] The first separation tower is used to separate the organosilicon monomer azeotrope, obtain the dimethyl dichlorosilane product at the bottom of the first separation tower, and obtain the tower of the first separation tower at the top of the first separation tower Top material, the top material of the first separation tower comprises silicon tetrachloride;

[0033] The fixed bed reactor is connected with the top of the first separation tower, and the inlet of the fixed bed reacto...

Embodiment 2

[0041] Such as figure 1 As shown, this embodiment provides a separation device for removing silicon tetrachloride in the azeotrope of organosilicon monomers, and directly synthesizes methylchlorosilane monomers to obtain the crude product of methylchlorosilane monomers, methyl chloride The crude product of silane monomer is separated by primary rectification to remove high boilers and low boilers to obtain organosilicon monomer azeotrope. The organosilicon monomer azeotrope mainly includes: trimethylchlorosilane, silicon tetrachloride , the separation device includes:

[0042] The first separation tower 1 is used to separate the organosilicon monomer azeotrope, and the dimethyldichlorosilane product with a content greater than 99mas% is obtained in the tower still of the first separation tower 1, and in the tower of the first separation tower 1 Top obtains the tower overhead material of the first separating tower 1, and the tower overhead material of the first separating towe...

Embodiment 3

[0061]The boiling point of trimethylchlorosilane: 57.9°C, 101KPa; the boiling point of silicon tetrachloride is 57.6°C, 101KPa; in the prior art, the mixture of these two substances cannot be effectively separated by general rectification. The crude product of methyl chlorosilane monomer synthesized by the direct method is sent to the first-stage height removal tower to remove high-boiling multi-component compounds mainly composed of silicon-silicon bonds and silicon-oxygen-silicon bonds; the top product is condensed Sent to the secondary de-lowering tower, through rectification to remove low-boiling multi-component compounds composed of methyl chloride, silicon tetrachloride, trimethyl monochlorosilane, and monomethyl hydrogen-containing dichlorosilane, and continue to send to the subsequent light Separation is carried out in separate towers; the product obtained in the tower still is sent to the three-stage separation tower, and the tower still obtains a high-purity dimethyld...

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Abstract

The invention discloses a separation device and separation method for removing silicon tetrachloride in an organosilicon monomer azeotrope, the separation device comprises: a first separation tower for separating the organosilicon monomer azeotrope, a fixed bed reactor connected with the tower top of the first separation tower, wherein a tower top material of the first separation tower flows intothe fixed bed reactor and undergoes a reverse disproportionation reaction with a dichlorosilane product under the catalytic action of a catalyst to generate trichlorosilane, a second separation towerconnected with the fixed bed reactor and used for separating materials flowing out of the fixed bed reactor, wherein a trimethyl monochlorosilane product is obtained at the tower bottom of the secondseparation tower, and a dichlorosilane product is obtained at the tower top of the second separation tower. According to the method disclosed by the invention, the load of a rectifying device in the prior art can be greatly reduced, silicon tetrachloride azeotrope in the organic silicon monomer azeotrope is removed, and silicon tetrachloride is converted into trichlorosilane.

Description

technical field [0001] The invention belongs to the technical field of separation of organochlorosilane monomers, and in particular relates to a separation device and method for removing silicon tetrachloride from organosilicon monomer azeotropes. Background technique [0002] Organosilicon compounds generally refer to compounds containing Si-C bonds. Because they have the properties of both inorganic materials and organic materials, their polymers have many excellent properties and are widely used in electrical and electronic, construction, chemical, textile, light industry, In various industries such as medical treatment, it is known as "industrial monosodium glutamate". As the starting material for the production of silicone polymers, silicone monomers occupy an important position in the silicone industry. Methylchlorosilane mainly refers to monomethylhydrogen-containing dichlorosilane, monomethyltrichlorosilane, dimethyldichlorosilane and trimethylmonochlorosilane. As a...

Claims

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Application Information

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IPC IPC(8): C07F7/20C07F7/12C01B33/107
CPCC07F7/20C07F7/12C01B33/1071
Inventor 蒋鹏银波陈国辉王三跃后文杰王聪江庆云
Owner XINTE ENERGY
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