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Methyl chlorosilane parallel double-effect distillation method

A technology of methylchlorosilane and dimethyldichlorosilane, which is applied in the field of parallel double-effect distillation of methylchlorosilane to achieve reliable process, increase energy consumption and avoid amplification effect

Active Publication Date: 2010-10-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, it is necessary to find an easy-to-operate, reliable and low-energy methyl chlorosilane refining method, while solving the possible amplification effect of large methyl chlorosilane distillation units

Method used

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  • Methyl chlorosilane parallel double-effect distillation method
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Embodiment 1

[0026] As shown in Figure 1, it is composed of two processing lines. The separation of Me2 and Me1 adopts the parallel double-effect rectification process of two-column process. The total feed rate is 18750kg / hr, which is equivalent to the output of Me1 and Me2 of 150kt / a. The content of Me2 in the feed is 80%, and the content of Me1 is 10.77% (mass content). The feed rate of the high-pressure processing line is 7963kg / hr, and the feed rate of the low-pressure processing line is 9732kg / hr. One of the materials enters the high-pressure refining and rectification system consisting of the monomethyltrichlorosilane high-pressure tower 1, the dichlorosilane high-pressure tower 2 and the dimethyldichlorosilane high-pressure refining tower 3, and the other one The low-pressure refining and rectifying system composed of trichlorosilane low-pressure tower 4, methyldichlorosilane low-pressure tower 5, and dimethyldichlorosilane low-pressure refining tower 6, said one methyl trichlorosila...

Embodiment 2

[0033] As shown in Figure 1, it is composed of two processing lines. The separation of Me2 and Me1 adopts the parallel double-effect rectification process of the binary tower process. The total feed rate is 18750kg / hr, which is equivalent to the output of Me1 and Me2 of 150kt / a. The content of Me2 in the feed is 80%, and the content of Me1 is 10.77% (mass content). The feed rate of the high-pressure processing line is 7963kg / hr, and the feed rate of the low-pressure processing line is 9732kg / hr. One of the materials enters the high-pressure refining distillation system composed of the binary high-pressure tower and the dimethyldichlorosilane high-pressure refining tower 3, and the other stream enters the binary low-pressure tower and the dimethyldichlorosilane low-pressure refining tower 6 A low-pressure refining and rectifying system composed of the two-element high-pressure tower and the top gas phase of the dimethyldichlorosilane high-pressure refining tower 3 as the bottom ...

Embodiment 3

[0040] As shown in Figure 1, it is composed of two processing lines. The separation of Me2 and Me1 adopts the parallel double-effect rectification process of two-column process. The total feed rate is 18750kg / hr, which is equivalent to the output of Me1 and Me2 of 150kt / a. The content of Me2 in the feed is 80%, and the content of Me1 is 10.77% (mass content). The feed rate of the high-pressure processing line is 7000kg / hr, and the feed rate of the low-pressure processing line is 11750kg / hr. One of the materials enters the high-pressure refining and rectification system composed of a methyltrichlorosilane high-pressure tower 1 and a dichlorosilane high-pressure tower 2, and the other material enters a methyltrichlorosilane low-pressure tower 4, methyldichlorosilane The low-pressure refining and rectifying system composed of silane low-pressure tower 5, the top gas phase of the said monomethyltrichlorosilane high-pressure tower 1, methyldichlorosilane high-pressure tower 2 is res...

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Abstract

The invention discloses a methyl chlorosilane parallel double-effect distillation method. The method comprises the following steps: the synthetic product of methyl chlorosilane passes through a heavy component removing tower for removing heavy components and a light component removing tower for removing light components, the mixture of dimethyldichlorosilane and methyltrichlorosilane can be obtained, the mixture is divided to two parts to be sent to two parallel distillation systems of high-pressure refining and low-pressure refining, wherein one part enters in a high-pressure refining distillation system composed of a methyltrichlorosilane high-pressure tower and a dimethyldichlorosilane high-pressure tower, the other part enters in a low-pressure refining distillation system composed of a methyltrichlorosilane low-pressure tower and a dimethyldichlorosilane low-pressure tower, and the overhead gas phases of the methyltrichlorosilane high-pressure tower and the dimethyldichlorosilane high-pressure tower are separately used as the heat sources of the tower bottom reboilers of the methyltrichlorosilane low-pressure tower and the dimethyldichlorosilane low-pressure tower. By adopting two parallel processing lines, energy consumption can be reduced by more than 20%- 40% and the amount of circulating water can be saved.

Description

Technical field [0001] The invention relates to a double-effect rectification method, in particular to a parallel double-effect rectification method for methylchlorosilane. Background technique [0002] Methylchlorosilane is synthesized from methyl chloride and silicon powder under the action of a catalyst. The reaction products mainly include dimethyldichlorosilane (Me2), monomethyltrichlorosilane (Me1), and low-boiling substances such as trimethyl One chlorosilane (Me3) and high boilers, of which Me2 has the highest content and the greatest value. [0003] The main purpose of Me2 is to produce an important intermediate for organosilicon material polysiloxane, but the purity of Me2 is higher, generally above 99.9% (wt.), and high temperature silicone rubber needs to be above 99.95%. The method of preparing high-purity Me2 is distillation, but since the atmospheric boiling point of Me2 (70.1℃) is very close to the atmospheric boiling point of Me1 (66.1℃), the difference is only 4℃...

Claims

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Application Information

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IPC IPC(8): C07F7/12C07F7/20
CPCY02P20/10
Inventor 许春建
Owner TIANJIN UNIV
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