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Monomer rectification technology and system thereof

A monomer and rectification technology, which is applied in organic chemistry, silicon organic compounds, chemical instruments and methods, etc., can solve the problem of low purity of dimethylformamide, and achieve the effects of simple process technology, good application prospects, and good application value

Active Publication Date: 2019-08-16
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product of this separation process is the final discharge of the tower kettle, and the tower kettle always contains a small amount of impurities, resulting in a low purity of dimethyl, about 99.85%.

Method used

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  • Monomer rectification technology and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The crude monomer 6 from monomer synthesis enters the de-high boiler 1 with the flow rate of 20.5 tons / hour, and the thick high boiler of the dehigh boiler 1 tower kettle is sent to the high boiler tower 5, and the distillate that the tower top takes out Enter the de-lowering tower 2; the temperature of the bottom of the high-removal tower 1 is controlled at 145.2°C, and the pressure of the bottom of the tower is controlled at 0.38MPa.

[0032] The low-boiling components extracted from the top of the de-decreasing tower 2 enter the subsequent rectification tower for separation, and are extracted from the bottom of the tower into the binary tower 3; the temperature at the top of the de-decreasing tower 2 is controlled at 74.3°C, and the pressure at the top of the tower is controlled at 0.07MPa.

[0033] The monomethyltrichlorosilane product 8 is extracted from the top of the binary tower 3, and the crude dimethyldichlorosilane extracted from the tower kettle enters the re...

Embodiment 2

[0037] The thick monomer 6 from monomer synthesis enters the de-high boiler 1 with the flow rate of 25.5 tons / hour, and the thick high boiler of the de-high boiler 1 tower kettle is sent to the high boiler tower 5, and the distillate that the tower top takes out Enter the de-lowering tower 2; the temperature of the bottom of the high-removal tower 1 is controlled at 150.6°C, and the pressure of the bottom of the tower is controlled at 0.40MPa.

[0038] The low-boiling components extracted from the top of the de-decreasing tower 2 enter the subsequent rectification tower for separation, and are extracted from the bottom of the tower into the binary tower 3; the temperature at the top of the de-decreasing tower 2 is controlled at 76.2°C, and the pressure at the top of the tower is controlled at 0.10 MPa.

[0039] The monomethyltrichlorosilane product 8 is extracted from the top of the binary tower 3, and the crude dimethyldichlorosilane extracted from the tower kettle enters the ...

Embodiment 3

[0043] The crude monomer 6 from the monomer synthesis enters the de-higher tower 1 with a flow rate of 30.5 tons / hour, the thick high boiling point of the de-higher tower 1 tower kettle is sent to the high boiling tower 5, and the distillate extracted from the top of the tower enters the high-boiling tower 5. The temperature of the bottom of the lower tower 2 and the first tower of the high removal tower are controlled at 161.6° C., and the pressure of the bottom of the tower is controlled at 0.43 MPa.

[0044] The low-boiling components extracted from the top of the de-decreasing tower 2 enter the subsequent rectification tower for separation, and are extracted from the bottom of the tower into the binary tower 3; the temperature at the top of the de-decreasing tower 2 is controlled at 78.6°C, and the pressure at the top of the tower is controlled at 0.13MPa.

[0045] The monomethyltrichlorosilane product 8 is extracted from the top of the binary tower 3, and the crude dimethy...

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Abstract

The invention discloses a monomer rectification technology and a system thereof. A crude monomer from synthesis of monomers firstly enters a high-boiling residue removal tower, crude high-boiling residues at the bottom of the high-boiling residue removal tower are sent into a high-boiling residue tower, and a distillate produced from the tower top enters a low-boiling residue removal tower; a low-boiling residue component is produced from the top of the low-boiling residue removal tower and then enters a subsequent rectifying tower for separation, and a product from the tower bottom enters a binary tower; a methyltrichlorosilane product is produced from the top of the binary tower, and crude dimethyl dichlorosilane produced from the tower bottom enters a refined dimethyl tower; a refined dimethyl dichlorosilane product is produced from the top of the refined dimethyl tower, and crude high-boiling residues produced from the tower bottom enter the high-boiling residue tower; a high-boiling residue product is produced from the bottom of the high-boiling residue tower, and a product from the tower top returns the high-boiling residue removal tower. By the technical scheme of the invention, the influence of high-boiling residue content of the crude monomer on monomer rectification can be eliminated, and the quality of the dimethyl dichlorosilane product is raised to 99.95% and above.

Description

technical field [0001] The invention relates to a monomer rectification process and system, belonging to the technical field of organosilicon production. Background technique [0002] Methylchlorosilane mixed monomers include dimethyldichlorosilane (abbreviated as dimethyl), monomethyltrichlorosilane (abbreviated as monomethyl), trimethylmonochlorosilane (abbreviated as trimethyl), monomethyldichlorosilane (abbreviated as trimethyl) Referred to as a hydrogen), high boilers and low boilers. As we all know, at present, the synthesis of methylchlorosilane monomers at home and abroad generally adopts the "direct method" synthesis process, using silicon powder and methyl chloride as raw materials, directly synthesizing methylchlorosilane mixed monomers under the action of a copper catalyst system, methylchlorosilane The mixed monomers are separated by rectification to obtain the main target product dimethyl, the by-products monomethyl, monomethan containing hydrogen, trimethyl, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/12C07F7/20
CPCC07F7/12C07F7/20Y02P20/10
Inventor 李书兵颜昌锐高英甘周清
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD