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Method for preparing polysiloxane by tail gas of 3-chloropropyltrichlorosilane

A technology of chloropropyltrichlorosilane and polysiloxane, which is applied in the field of preparing polysiloxane from the production tail gas of 3-chloropropyl trichlorosilane, which can solve the problem of increased difficulty, difficult handling, and increased cost of tail gas treatment equipment Check the shutdown time and other issues to achieve the effect of increasing lipophilicity, reducing production costs and environmental protection pressure

Active Publication Date: 2018-10-30
南京曙光精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each component in the synthesis tail gas has a high reuse value. In the prior art, the above-mentioned chlorine-containing silanes are neutralized and hydrolyzed for absorption by the alkali treatment method. The alkali treatment method uses a large amount of alkali, and the process of the equipment is The parameters and performance requirements are very high, which increases the cost of tail gas treatment and the time for equipment inspection and shutdown. Moreover, the product after hydrolysis is a viscous solid containing water, which is difficult to treat as chemical solid waste, and the hydrochloric acid produced by hydrolysis and absorption is mostly turbid and harmful. Suspended liquids, some of which require manual removal of slag, increase the difficulty of continuous and stable production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The tail gas discharged from the 3-chloropropyltrichlorosilane synthesis device is frozen at -35°C and pressurized to 0.05Mpa, and then passed into the ethanol absorption liquid receiving device, which uses -35°C frozen water Insulation, the tail gas non-condensable gas purified by the ethanol absorption liquid enters the water absorption system; the crude product of the esterification reaction is obtained after continuous exhaust for 48 hours, and a sample is taken for gas phase analysis. It is detected that the ethanol content in the crude product of the esterification reaction is 26%, and the water The hydrochloric acid produced by the absorption system is a transparent liquid without suspended matter; transfer the crude product of the esterification reaction to the synthesis device, bring a negative pressure of -0.085Mpa to the synthesis device, and keep it at 35°C~45°C for 2h until no gas overflows; The device is heated up to 50°C, and a mixture of ethanol and water...

Embodiment 2

[0039] The tail gas discharged from the 3-chloropropyltrichlorosilane synthesis device is frozen at -35°C and pressurized to 0.2Mpa, and then passed into the ethanol absorption liquid receiving device, which uses -15°C frozen water Insulation, the tail gas non-condensable gas purified by the ethanol absorption liquid enters the water absorption system; the crude product of the esterification reaction is obtained after continuous exhaust for 48 hours, and a sample is taken for gas phase analysis. It is detected that the ethanol content in the crude product of the esterification reaction is 22%, water The hydrochloric acid produced by the absorption system is a transparent liquid without suspended matter; transfer the crude product of the esterification reaction to the synthesis device, bring a negative pressure of -0.085Mpa to the synthesis device, and keep it at 35°C~45°C for 2h until no gas overflows; The device is heated up to 50°C, and a mixture of ethanol and water with a m...

Embodiment 3

[0041]The tail gas discharged from the 3-chloropropyltrichlorosilane synthesis device is frozen at -35°C and pressurized to 0.15Mpa, and then passed into the ethanol absorption liquid receiving device, which uses -15°C frozen water Insulation, the tail gas non-condensable gas purified by the ethanol absorption liquid enters the water absorption system; the crude product of the esterification reaction is obtained after continuous exhaust for 48 hours, and a sample is taken for gas phase analysis. It is detected that the ethanol content in the crude product of the esterification reaction is 23%, water The hydrochloric acid produced by the absorption system is a transparent liquid without suspended matter; transfer the crude product of the esterification reaction to the synthesis device, bring a negative pressure of -0.085Mpa to the synthesis device, and keep it at 35°C~45°C for 2h until no gas overflows; The device is heated up to 50°C, and a mixture of ethanol and water with a m...

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PUM

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Abstract

The invention discloses a harmless treating method for tail gas of 3-chloropropyltrichlorosilane. Under the conditions of micro-positive pressure and freezing, excessive amount of absolute ethyl alcohol absorption liquid is utilized to dissolve and react with non-condensable gases, including trichlorosilane, silicon tetrachloride and propyl trichlorosilane, in 3-chloropropyltrichlorosilane synthesized tail gas, after the process, the non-condensable gases in the 3-chloropropyltrichlorosilane synthesized tail gas only comprise hydrogen chloride and cleaned propylene, and then the chloride removing treatment can be applied in the next process unit. The ethyl alcohol absorption liquid with absorbed non-condensable gases, including the trichlorosilane, the silicon tetrachloride and the propyltrichlorosilane, is an incompletely esterified crude product, and the incompletely esterified crude product is then subjected to alcoholysis and hydrolysis to prepare a polysiloxane product with an added value. The method has the advantages that harmless treatment of the 3-chloropropyltrichlorosilane synthesized tail gas is realized, and by turning the 3-chloropropyltrichlorosilane synthesized tail gas into marketable polysiloxane, production cost and pressure on environmental protection are reduced.

Description

technical field [0001] The invention relates to a method for treating the production tail gas of synthesizing 3-chloropropyl trichlorosilane, in particular to a method for preparing polysiloxane by using the production tail gas of 3-chloropropyl trichlorosilane. Background technique [0002] 3-Chloropropyltrichlorosilane is the most basic monomer in silane coupling agents, and is the main raw material for the synthesis of silane coupling agent series products. Silane coupling agent, etc. [0003] At present, the large-scale industrial production of 3-chloropropyltrichlorosilane is prepared by the hydrosilylation reaction of raw materials trichlorosilane and chloropropene under catalyst conditions. The tail gas components emitted during the synthesis process mainly include: trichlorosilane, silicon tetrachloride, propyltrichlorosilane, propylene, etc. Each component in the synthesis tail gas has a high reuse value. In the prior art, the above-mentioned chlorine-containing s...

Claims

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Application Information

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IPC IPC(8): C08G77/04C08G77/06
CPCC08G77/04C08G77/06
Inventor 陶再山李春华
Owner 南京曙光精细化工有限公司