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Methyl chlorosilane separating device and method with internally heat integrated distillation towers

A monomethyltrichlorosilane, internal thermal coupling technology, applied in separation methods, distillation separation, chemical instruments and methods, etc., to achieve the effects of reducing investment, reducing steam consumption, and reducing process energy consumption

Active Publication Date: 2019-03-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for the common methylchlorosilane separation technology in the industry, only the application of ordinary rectification technology has been realized in the industry

Method used

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  • Methyl chlorosilane separating device and method with internally heat integrated distillation towers
  • Methyl chlorosilane separating device and method with internally heat integrated distillation towers
  • Methyl chlorosilane separating device and method with internally heat integrated distillation towers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 2 Shown, a kind of device that separates monomethyl trichlorosilane and dimethyl dichlorosilane, this device can be used for separating the high-purity methyl chlorosilane product, and it comprises the high-pressure rectification column A without reboiler, without The low-pressure rectification tower B of the condenser; the flow transfer between the two towers is carried out through the pressure reducing valve 3 and the compressor 4 to reduce / boost the pressure appropriately so as to meet the working conditions of the next tower. Considering the high requirement of product purity, 3 side lines are respectively drawn out between the two towers, and the heat is exchanged through the middle 3 heat exchangers 5 / 6 / 7 and then sent back to the same tray; There are raw material inlets, three side line gas phase extraction outlets and liquid phase return ports, and the side line extraction ports and return ports are all set on the same tray; the top of the tower ...

Embodiment example 1

[0032] Table 2 The main conditions of the device in implementation case 1

[0033]

[0034]

[0035] Table 3-Methyltrichlorosilane qualified product composition, mass fraction wt%

[0036]

[0037] Table 4 Dimethyldichlorosilane product composition, mass fraction wt%

[0038]

[0039] Table 5 Comparison of heating and cooling loads of new and old processes

[0040]

[0041] To sum up, this device achieves about 37% energy-saving effect of the traditional methylchlorosilane separation process through the discrete internal thermal coupling rectification technology, greatly reduces the consumption of cooling water and steam, and has significant economic benefits; and figure 1 Compared with the traditional separation process shown in the figure, the change range of this device is small, the overall structure is simple, the implementation difficulty is low, and it has obvious feasibility.

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Abstract

The invention discloses a methyl chlorosilane separating device and method with internally heat integrated distillation towers. The method comprises feeding a mixed material of methyl trichlorosilaneand dimethyldichlorosilane into a high-pressure tower without a reboiler, and extracting methyltrichlorosilane products from the top of the high-pressure tower; arranging 3-10 side lines on the side of the tower to extract and deliver vapor to different heat exchanger for condensation and recycling; extracting mixed solution from the bottom of the tower; delivering the mixed solution to the top ofa low-pressure tower without a condenser, extracting mixed vapor from the top of the low-temperature tower, and pressurizing and conveying the mixed vapor to the bottom of the high-pressure tower; arranging the same number of side lines on the side of the lower-pressure tower, extracting and conveying liquid to corresponding heat exchangers for evaporation and recycling; extracting dimethyldichlorosilane products from the bottom of the low-pressure tower. By means of the internally heat integrated distillation technology, the methyl chlorosilane separating device and method with the internally heat integrated distillation towers can achieve high heat integrated energy conservation of traditional methyl chlorosilane separating processes, greatly reduce consumption of cooling water and vapor and achieve significant economic benefits.

Description

technical field [0001] The invention relates to a rectification method for organosilicon monomer, especially an energy-saving methyl chlorosilane rectification method and device; in particular, it relates to a method and device for separating methyl chlorosilane by using an internal heat-coupled rectification tower. Background technique [0002] Organosilicon compounds generally refer to compounds containing Si-C bonds. Because they have the properties of both inorganic materials and organic materials, their polymers have many excellent properties and are widely used in electrical and electronic, construction, chemical, textile, light industry, In various industries such as medical treatment, it is known as "industrial monosodium glutamate". As the starting material for the production of silicone polymers, silicone monomers occupy an important position in the silicone industry. Methylchlorosilane mainly refers to monomethyltrichlorosilane (hereinafter referred to as monomet...

Claims

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Application Information

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IPC IPC(8): C07F7/12C07F7/20B01D3/14
CPCB01D3/146C07F7/12C07F7/20
Inventor 孙津生奚志骏崔承天刘思瑶
Owner TIANJIN UNIV
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