Purification packed tower and purification method of methyl trichlorosilane

A technology of monomethyltrichlorosilane and methyltrichlorosilane, which is applied in separation methods, chemical instruments and methods, silicon organic compounds, etc., can solve problems such as huge maintenance costs and operating costs, difficulty in realistic manufacturing, and high reflux ratio , to achieve the effect of small cooling and heating public works consumption, optimized operating conditions, and efficient separation

Pending Publication Date: 2022-06-07
浙江中天东方氟硅材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] C 6 h 12 The boiling point of olefins is very close to that of monomethyltrichlorosilane. If the traditional plate column distillation is used, the operating conditions will be extremely harsh, and a huge reflux ratio and a very high number of plates have to be used, which will not only bring Huge investment costs will also generate huge maintenance costs and operating costs in the later stage, and the extremely high tower height is even difficult to realistically manufacture

Method used

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  • Purification packed tower and purification method of methyl trichlorosilane
  • Purification packed tower and purification method of methyl trichlorosilane
  • Purification packed tower and purification method of methyl trichlorosilane

Examples

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Effect test

Embodiment 1

[0039] like figure 1 As shown, the methylchlorosilane mixture with a temperature of 66.9 °C and a flow rate of 370 kg / h obtained from the previous section was 99.4 wt% of monomethyltrichlorosilane, 0.1 wt% of 2-methyl-2-pentene, 3 - Methyl-2-pentene 0.33 wt%, trimethylmonochlorosilane 0.02 wt%, and dimethyldichlorosilane 0.13 wt% are fed from the feed port 6 at a height of 10 m of the filler, and the material is at the filler position 5 and re- The steam rises in the boiler for gas-liquid mass transfer, enters the reboiler and is converted into steam, enters the tower body from the reboiler steam inlet 8, and transfers gas and liquid mass between the packing part and the condensate at the top of the tower and the feed liquid, and is fully transferred. The high-quality gas and liquid phases pass through the defoaming net 3 to reach the discharge port 1 to obtain light components, and part of the gas and liquid phases enter the tower top condenser to condense into liquid, and th...

Embodiment 2

[0041] Methylchlorosilane mixture with a temperature of 66.5°C and a flow rate of 370kg / h obtained from the previous section: monomethyltrichlorosilane 99.4 wt%, 2-methyl-2-pentene 0.07 wt%, 3-methyl -2 Pentene 0.36 wt%, trimethylmonochlorosilane 0.05 wt%, dimethyldichlorosilane 0.12 wt% are fed from the feed port 6 at a height of 10m of the filler, and the material is in the filler part 5 and the reboiler The rising steam transfers gas-liquid mass, enters the reboiler and turns into steam, enters the tower body from the reboiler steam inlet 8, and transfers gas-liquid mass between the packing part and the condensate at the top of the tower and the feed liquid, and the gas with sufficient mass transfer. The liquid phase passes through the defoaming net 3 to reach the discharge port 1 to obtain light components, and part of the gas and liquid phase enters the tower top condenser to be condensed into liquid, and then returns to the tower body through the condenser reflux pipe 2 a...

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Abstract

The invention relates to the field of chemical production, and discloses a packed tower for separating and purifying high-purity methyl trichlorosilane. According to the scheme, the packed tower comprises the tower body, the end socket, the connecting pipe, the packing, the skirt, the defoaming net, the feeding pipe, the liquid distributor and the packing supporting plate, and compared with a traditional plate tower, the packed tower has the advantages that the process conditions become mild and safe, meanwhile, the construction cost is reduced, the economical efficiency is high, the maintenance is easy, impurities in methyl trichlorosilane can be efficiently removed, and the production cost is reduced. The content of 3-methyl-2-pentene is lower than 0.06% wt, the purity of 2-methyl-2-pentene is lower than 0.1% wt, the requirement that the content of impurities in first-grade methyl trichlorosilane is lower than 0.1% wt in the national standard GB T 20434-2006 is met, and finally methyl trichlorosilane with the purity larger than 99.8% is obtained.

Description

technical field [0001] The invention relates to a packing tower for separating and purifying high-purity monomethyltrichlorosilane, and belongs to the field of chemical production. Background technique [0002] Monomethyltrichlorosilane is an important organosilicon monomer material. It is the main by-product in the direct synthesis of dimethyldichlorosilane. It can be used to prepare silicone resin, fumed silica and methyltrimethoxysilane coupling. agents and other materials. The boiling point of monomethyltrichlorosilane is 66.4 ℃. It is mainly separated from chlorosilane monomer by rectification process in production, and the purity is more than 99%. However, after research, there is also C in monomethyltrichlorosilane. 6 H 12 Structural olefins, such as 2-methyl-2-pentene, 3-methyl-2-pentene, etc., have boiling points of 67.3 ℃ and 68.5 ℃ respectively, which are very close to the boiling point of monomethyltrichlorosilane. C 6 H 12 Olefins have many adverse effects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D3/42B01J19/30B01D19/02C07F7/12C07F7/20
CPCB01D3/14B01D3/42B01D3/4205B01D3/4227B01J19/30B01D19/02C07F7/20C07F7/12Y02P20/10
Inventor 代伟何文杰汪海风吉兰平金钰宁李鹏洲
Owner 浙江中天东方氟硅材料股份有限公司
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