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Organic silicon complete variable-pressure thermal coupling rectification device and rectification method

A technology of thermal coupling and organic silicon, which is applied in the field of organic silicon rectification, can solve the problems of increasing equipment investment, affecting the smooth operation of the system, and not solving the problem of energy consumption of the de-higher tower, so as to achieve the effect of reducing equipment investment

Pending Publication Date: 2021-12-24
天津市华瑞奕博化工科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent application with application number 201210032092.2 proposes a new process for the separation of methylchlorosilane crude monomer, but still adopts the conventional series mode, and the problem of energy consumption of the de-higher tower and lower-lower tower is still not solved
[0006] In addition, in the prior art, an additional condenser is usually required in the coupled towers to condense the excess steam, or the excess steam is introduced into the reboiler of the next tower as a heat source, and then the next tower needs another The reboiler with steam as the heat source makes up for the lack of heat, which increases the risk of affecting the smooth operation of the system due to the complexity of the process while increasing the equipment investment.

Method used

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  • Organic silicon complete variable-pressure thermal coupling rectification device and rectification method
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  • Organic silicon complete variable-pressure thermal coupling rectification device and rectification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Such as figure 1 The shown organosilicon complete pressure-swing thermally coupled rectification device includes: de-higher tower 1, lower-lower tower 2, high-pressure binary tower 3 and low-pressure binary tower 4,

[0069] The tower kettle of the lowering tower 1 is provided with a coupling reboiler 12 for taking off the lowering tower tower kettle, and the tower kettle of the low-pressure binary tower 4 is provided with a low-pressure binary tower tower kettle coupling reboiler 13;

[0070]The tower top of the height-removing tower 1 is connected with the coupling reboiler 13 of the low-pressure binary tower still, and the gas phase stream at the top of the height-removing tower 1 provides a heat source for the low-pressure binary tower still, and the gas phase flowing out of the tower top of the height-removing tower 1 The stream enters the shell-side inlet of the low-pressure binary column column coupling reboiler 13, and the shell-side outlet of the low-pressure b...

Embodiment 2

[0080] use as figure 1 The rectification unit shown is used for the separation of crude methylchlorosilane monomer. The feed rate of the methyl chlorosilane crude monomer is 25000kg / hr, wherein in terms of mass fraction: Me1 is 60%, Me2 is 82%, Me3 is 5.6%, and the rest are high boilers and low boilers. The crude methyl chlorosilane monomer enters the de-altitude tower, and the heavy components are extracted from the bottom of the tower, including part of dimethyl dichlorosilane and high boilers with a higher boiling point than dimethyl dichlorosilane; dimethyl dichlorosilane is extracted from the top of the tower. Chlorosilane and light components with a lower boiling point than dimethyldichlorosilane, the top extract is used as the heat source of the low-pressure binary column coupling reboiler, and is cooled after exchanging heat with the column liquid in the coupled reboiler , and then enter the lowering tower. The top extraction of the lowering tower includes trimethylm...

Embodiment 3

[0090] The raw material conditions are as follows: the feed rate of the crude methyl chlorosilane monomer is 25000kg / hr, wherein in terms of mass fraction: Me1 is 5%, Me2 is 83%, Me3 is 5.6%, and the rest are high boilers and low boilers . All the other conditions are the same as in Example 2. The material recovery of each tower is shown in Table 3.

[0091] Table 3 The material recovery situation of each tower

[0092]

[0093]

[0094] Under the same processing capacity and product requirements, the comparison data of energy consumption between the non-coupling process and the coupled process in Example 3 are shown in Table 4.

[0095] Table 4 Energy Consumption Comparison of Coupling Process and Non-Coupling Process in Example 3

[0096]

[0097] From the comparative data shown in Table 4, it can be seen that the load of the reboiler is only 53% of that of the non-coupling process, and the load of the condenser is only 50% of the coupling process, so that the c...

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Abstract

The invention discloses an organic silicon complete variable-pressure thermal coupling rectification device and rectification method. The device comprises a high boiler removal tower, a low boiler removal tower, a high-pressure binary tower and a low-pressure binary tower. The low boiler removal tower and the low-pressure binary tower are each provided with a tower kettle coupling reboiler. The top of the high boiler removal tower is connected with the tower kettle coupling reboiler of the low-pressure binary tower, and a gas-phase material flow at the top of the high boiler removal tower provides a heat source for the tower kettle coupling reboiler of the low-pressure binary tower. The tower top of the high-pressure binary tower is connected with the tower kettle coupling reboiler of the low boiler removal tower, and a gas-phase material flow at the top of the high-pressure binary tower provides a heat source for the tower kettle coupling reboiler of the low boiler removal tower. By adjusting the feeding amounts of the high-pressure binary tower and the low-pressure binary tower, complete coupling of heat of the high boiler removal tower, heat of the low boiler removal tower and heat of the high-pressure binary tower and heat of the low-pressure binary tower is achieved, the defect that in the prior art, partial coupling between towers is achieved, and complete coupling is not achieved is overcome, energy consumption is reduced, and meanwhile, equipment investment which has to be additionally increased for stable operation of the system is reduced.

Description

technical field [0001] The invention belongs to the field of organosilicon rectification, and relates to an organosilicon rectification process, in particular to an organosilicon complete pressure-variable thermal coupling rectification device and a rectification method. Background technique [0002] At a higher reaction temperature, the halogenated hydrocarbon and silicon powder are acted on in one step through a catalyst to generate a crude methylchlorosilane monomer, which mainly contains trimethylmonochlorosilane (Me3), monomethyltrichlorosilane (Me1) and Dimethyldichlorosilane (Me2), as well as high boilers with a higher boiling point than dimethyldichlorosilane (Me2) and low boilers with a lower boiling point than trimethylmonochlorosilane (Me3). [0003] The separation of the crude methyl chlorosilane monomer will go through the treatment of de-elevation, de-lowering and binary tower, that is, the crude methyl chlorosilane monomer enters the de-elevation tower, and re...

Claims

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Application Information

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IPC IPC(8): B01D3/14B01D3/00B01D3/32C07F7/12C07F7/20
CPCB01D3/14B01D3/007B01D3/322B01D3/141C07F7/12C07F7/20
Inventor 曹咏军赵华
Owner 天津市华瑞奕博化工科技有限公司
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