Energy-saving water-saving organic silicon monomer rectifying method

An organosilicon and water-saving technology, which is applied in organic chemistry, silicon organic compounds, chemical instruments and methods, etc., can solve the problems of large loss of surplus monomer and A, and achieve reduced evaporation loss, strong operation controllability, The effect of flexibility

Active Publication Date: 2012-08-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the 8-tower process is directly separated from the binary tower. Without recycling, it may cause a large loss of the surplus monomer.

Method used

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  • Energy-saving water-saving organic silicon monomer rectifying method
  • Energy-saving water-saving organic silicon monomer rectifying method
  • Energy-saving water-saving organic silicon monomer rectifying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The top material vapor of the de-higher tower first enters the distribution main pipe, and then passes through the distribution main pipe to the towers of the de-lowering tower, the light fractionation tower, the hydrogen-containing tower, the azeotropic tower, the three first towers, the first first tower and the second first tower respectively. The bottom reboiler supplies heat, and after the heat supply, the steam at the top of the de-elevation tower is condensed into a liquid, which is cooled by an air cooler to the reflux temperature and enters the top reflux tank of the de-elevation tower. The bottom of the dimethyl tower is connected to a first Two reboilers, the second reboiler adopts water vapor heat exchange, the average operating pressure of the whole tower of the described height removal tower is 300KPa, the temperature at the bottom of the tower is controlled at 135°C, and the temperature at the top of the tower is controlled at 120°C; The average operating ...

Embodiment 2

[0025] The top material vapor of the de-higher tower first enters the distribution main pipe, and then passes through the distribution main pipe to the towers of the de-lowering tower, the light fractionation tower, the hydrogen-containing tower, the azeotropic tower, the three first towers, the first first tower and the second first tower respectively. The bottom reboiler supplies heat, and after the heat supply, the steam at the top of the de-elevation tower is condensed into a liquid, which is cooled by an air cooler to the reflux temperature and enters the top reflux tank of the de-elevation tower. The bottom of the dimethyl tower is connected to a first Two reboilers, the second reboiler adopts water vapor heat exchange, the average operating pressure of the whole tower of the described height removal tower is 500KPa, the temperature at the bottom of the tower is controlled at 125°C, and the temperature at the top of the tower is controlled at 130°C; The average operating ...

Embodiment 3

[0028]The overhead material vapor of the de-higher tower first enters the distribution main pipe, and then passes through the distribution main pipe respectively to the bottom reboiler of the de-lowering tower, the light separation tower, the hydrogen-containing tower, the azeotropic tower, the three-methyl tower and the second-methyl tower. After heating, the vapor of the overhead material in the de-elevation tower is condensed into a liquid, cooled by an air cooler to the reflux temperature, and enters the top reflux tank of the de-elevation tower. The bottom of the dimethyl tower is connected with a second reboiler , the steam of the tower top material of the first tower supplies heat to the second reboiler of the second tower, and jointly maintains the operation of the second tower together with the first reboiler that is heated by the tower top steam of the de-higher tower. The top material steam of tower A enters the top reflux tank of tower A after being heated, and the ...

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Abstract

The invention discloses an energy-saving water-saving organic silicon monomer rectifying method which adopts a cis cleavage multi-tower flow. In the rectifying method, the tower top material steam of a high-boiling component removing tower firstly enters a main distribution manifold, then heat is respectively supplied for tower bottom reboilers of a low-boiling component removing tower, a light component removing tower, a hydrogenous tower, an azeotropic tower, a trimethylchlorosilane separating tower, a methyl trichloro silicane separating tower and a dimethyldichlorosilane separating tower through the main distribution manifold, the tower top material steam of the high-boiling component removing tower after heat supply is condensed into liquid, is then cooled to the reflux temperature through an air cooler and enters a tower top reflux tank of the high-boiling component removing tower, a second reboiler is connected with the tower bottom of the dimethyldichlorosilane separating tower, and vapor is adopted for the heat exchange of the reboiler. By adopting the method, because the operating pressure and the operating temperature of the high-boiling component removing tower and themethyl trichloro silicane separating tower with larger cooling quantity requirements are increased, at least two towers in the flow have the condition of adopting air cooling, thereby reducing the circulating water quantity and decreasing the evaporation loss; and the energy-saving water-saving organic silicon monomer rectifying method has strong operation controllability, flexible mode, multiplecontrol means, smaller pressure increasing amplitude and high operation security.

Description

technical field [0001] The invention relates to a rectification method for organosilicon monomers, in particular to an energy-saving rectification technology for organosilicon monomers. Background technique [0002] The methods for separating crude organochlorosilane monomers include physical separation and chemical separation, and rectification is mainly used in industry. Among them, the characteristic of the traditional 7-tower process is that dimethyldichlorosilane and monomethyltrichlorosilane should be clearly cut in the dimethyl tower, and there is no circulating stock in the process. At present, in addition to the traditional 7-tower process, the first tower of many domestic production plants for methyl chlorosilane is a de-height tower, but the processing sequence from the second tower onwards varies from company to company. According to the processing sequence, the crude organochlorosilane monomer rectification separation process can be divided into four types: cis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/12C07F7/20
CPCY02P20/10
Inventor 孙津生吴鹏高红王艳红苏燕霞闫东李婧
Owner TIANJIN UNIV
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