Methyl chlorosilane monomer separation and heat integration process design method

A technology of methylchlorosilane and heat integration, which is applied in chemical instruments and methods, organic chemistry, compounds of group 4/14 elements of the periodic table, etc., can solve problems such as difficult to break through energy consumption bottlenecks, and achieve cost reduction and reduction Effects of energy consumption and high energy efficiency

Active Publication Date: 2022-05-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, the separation sequence and heat collection arrangement of methylchlorosilane monomer rectification are limited to a limited set, and it is difficult to break through the energy consumption bottleneck

Method used

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  • Methyl chlorosilane monomer separation and heat integration process design method
  • Methyl chlorosilane monomer separation and heat integration process design method
  • Methyl chlorosilane monomer separation and heat integration process design method

Examples

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Effect test

Embodiment 1

[0017] Methylchlorosilane monomer distillation processes, such as Figure 1 as shown. The pre-sub-tower is divided into discontinuous key components by first and recombination, to achieve a clear separation of the two, 18% of the mass flow of the incoming material dia is distributed at the bottom of the tower, the heat load at the bottom of the tower accounts for 17% of the heating demand of the whole device, the theoretical number of plates and the feed position are designed as 200 and 20, the operating pressure range is 110-170kPa, the operating temperature range is 71.5-89.0 °C, and the return ratio is controlled at 1.1. The erjia tower takes the first and second A as the continuous key components, and the heat load at the bottom of the tower can account for 76%, the theoretical plate number and feed position are designed as 333 and 90, the operating pressure range is 110-211kPa, the operating temperature range is 61.8-95.3 °C, and the reflux ratio is controlled at 54.6. The ...

Embodiment 2

[0019] Methylchlorosilane monomer separation without dismantling columns for thermally integrated distillation processes, e.g Figure 2as shown. The theoretical number of plates and feed position of the pre-sub-tower are designed to be 171 and 12, respectively, the operating pressure range is 320-370kPa, the operating temperature range is 108.9-118.6 °C, and the return ratio is controlled at 3.1. The theoretical plate number and feed position of the erjia tower are designed to be 320 and 90, respectively, the operating pressure range is 110-210kPa, the operating temperature range is 61.8-94.6 °C, and the return ratio is controlled at 56.4. The theoretical plate number and feed position of the first tower are designed to be 111 and 55, respectively, the operating pressure range is 610-640kPa, the operating temperature range is 115.7-139.7 °C, and the return ratio is controlled at 5.9. The theoretical plate number and feed position of the removal tower are designed as 51 and 38, re...

Embodiment 3

[0021] Methylchlorosilane monomer separation feed combined with heavy-end segmentation thermal integrated distillation processes, e.g Figure 3as shown. The theoretical number of plates and feed position of the pre-sub-tower are designed to be 223 and 23, respectively, the operating pressure range is 300-370kPa, the operating temperature range is 106.9-118.6 °C, and the reflux ratio is controlled at 2.3. 59% of the distillate at the top of the pre-division tower enters the erjia A tower, and the rest enters the lower position of the erjia B tower. The theoretical plate number and feed position of the dijia A tower are designed to be 247 and 21, respectively, the operating pressure range is 320-400kPa, the operating temperature range is 108.5-120.4 °C, and the return ratio is controlled at 12.7. The theoretical plate number and feed position of Tower B are designed to be 285, 64 and 94, respectively, the operating pressure range is 110-200kPa, the operating temperature range is 61....

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Abstract

The invention discloses a methyl chlorosilane monomer separation and heat integration process design method, which is characterized in that a pre-separation tower takes methyl trichlorosilane and heavy components as discontinuous light and heavy key components, and dimethyl chlorosilane is distributed at the tower top and the tower bottom according to the optimal proportion; materials at the top of the pre-separation tower enter a dimethyl tower, dimethyl dichlorosilane is extracted from the bottom of the dimethyl tower, and light components and methyl trichlorosilane are extracted from the top of the dimethyl tower and are used as feeding materials of a subsequent methyl tower. And feeding the material at the bottom of the pre-separation tower into a heavy component removal tower, and separating to obtain dimethyldichlorosilane and heavy components. In a set containing 63 possible separation sequences in the industry, the method has the advantage of high energy consumption efficiency, and the annual total cost is remarkably reduced under the condition that the same separation requirement is met. The tower bottom load of the dimethyl B tower is completely supplied with heat by the tower top steam of the dimethyl A tower, and the tower bottom load of the pre-separation tower is completely supplied with heat by the tower top steam of the first-dimethyl tower, the tower top steam of the dimethyl A tower and the tower top steam of the de-heavy tower in sequence. The total cost of the whole year can be reduced by more than 16% through the optimal heat integration scheme.

Description

Technical field [0001] The present invention relates to a methylchlorosilane monomer distillation process method in the silicone separation industry, specifically to a methylchlorosilane monomer separation and its thermal integration process design method. Background [0002] The energy consumption of methyl chlorosilane monomer distillation is concentrated on the separation of monomethyltrichlorosilane ("monomethyl") and dimethyldichlorosilane ("dimethane"). The separation process has three characteristics: 1) the typical composition of the reaction section product in the pre-distillation section is 5-15% wt of the first-class content and 75-90% wt of the second-class content; 2) the difference between the atmospheric pressure boiling point of the first and second-class is only 3.8 °C, and the relative volatility is only 1.1, so that the number of theoretical plates required for separation is as high as hundreds of pieces, and the site needs to use multiple towers to complete t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/16
CPCC07F7/16
Inventor 孙津生张晓东金璐
Owner TIANJIN UNIV
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