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A kind of method utilizing the tail gas of 3-chloropropyl trichlorosilane to prepare polysiloxane

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: 2021-06-11
南京曙光新材料有限公司
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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 exhaust gas discharged from the 3-chloropropylene trichlorosilane synthesis apparatus is frozen and pressurized to 0.05 MPa, and then the ethanol absorbing liquid receiving device is supplied with -35 ° C freezing water in the ethanol absorbing liquid receiving device. Insulation, passed through ethanol absorption liquid into the water absorption system; after continuous exhaust gas 48h, the esterification reaction was obtained, and the gas phase analysis was taken, and the ethanol content of the esterification reaction was 26%, water. The hydrochloric acid made of absorbing system is transparent, no suspension liquid; transfer the esterification reaction to the synthesis device, the synthesis device is negative pressure -0.085MPa, and heat insulation at 35 ° C to 45 ° C for 2 h to no gas spill; The device is tapered to 50 ° C, and the molar ratio of 2: 1 is added dropwise at 50 ° C to 55 ° C, and the mixed solution is 0 (gas chromatographic detection), and then the fir...

Embodiment 2

[0039] The exhaust gas discharged from the 3-chloropropylene trichlorosilane synthesis apparatus is frozen and pressurized to 0.2 MPa, and then the ethanol absorbing liquid receiving device is supplied with -15 ° C. Insulation, passed through ethanol absorption liquid into the water absorbing system; after continuous exhaust 48h, the esterification reaction was obtained, and the gas phase analysis was sampled, and the ethanol content of the esterification reaction was 22%, water. The hydrochloric acid made of absorbing system is transparent, no suspension liquid; transfer the esterification reaction to the synthesis device, the synthesis device is negative pressure -0.085MPa, and heat insulation at 35 ° C to 45 ° C for 2 h to no gas spill; The device is tapered to 50 ° C, and the molar ratio of 2: 1 is added dropwise at 50 ° C to 55 ° C, and the mixed solution is 0 (gas chromatographic detection), and then the first pressure distillation is then reduced. Ethanol is evaporated, and...

Embodiment 3

[0041]The exhaust gas discharged from the 3-chloropropylene trichlorosilane synthesis apparatus is frozen and pressurized to 0.15 MPa, and then the ethanol absorbing liquid receiving device is supplied with -15 ° C. Insulation, passed through ethanol absorption liquid into the water absorption system; after continuous exhaust gas 48h, the esterification reaction was obtained, and the gas phase analysis was sampled, and the ethanol content of the esterification reaction was 23%, water. The hydrochloric acid made of absorbing system is transparent, no suspension liquid; transfer the esterification reaction to the synthesis device, the synthesis device is negative pressure -0.085MPa, and heat insulation at 35 ° C to 45 ° C for 2 h to no gas spill; The device is tapered to 50 ° C, and the molar ratio of 2: 1 is added dropwise at 50 ° C to 55 ° C, and the mixed solution is 0 (gas chromatographic detection), and then the first pressure distillation is then reduced. Ethanol was evaporate...

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PUM

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Abstract

The invention discloses a method for harmless treatment of tail gas of 3-chloropropyl trichlorosilane, which uses excess absolute ethanol absorption solution to dissolve and react 3-chloropropyl trichlorosilane under micro positive pressure and freezing conditions. The non-condensable gas trichlorosilane, silicon tetrachloride, and propyltrichlorosilane in the tail gas of silane synthesis, after this process, the non-condensable gas in the tail gas of 3-chloropropyltrichlorosilane synthesis is only hydrogen chloride and is cleaned The propylene can enter the next process equipment for chlorine-free treatment; the ethanol absorption liquid that has absorbed the non-condensable gas trichlorosilane, silicon tetrachloride, and propyltrichlorosilane is an incompletely esterified crude product, and the incomplete The esterified crude product undergoes alcoholysis and hydrolysis to prepare value-added polysiloxane products; the present invention realizes the harmless treatment of 3-chloropropyl trichlorosilane synthesis tail gas, and converts it into marketable polysiloxane , reducing production costs and environmental protection pressure.

Description

Technical field [0001] The present invention relates to a method of treating the production of exhaust gas synthesizing 3-chlorpropylene trichlorosilane, and is specifically involved in a method of preparing a polysiloxane using 3-chloropropyl trichlorosilane. Background technique [0002] 3-chloropropyltrichlorosilane is the most basic monomer in the silane coupling agent, which is the main production of raw materials for synthesizing the silane coupling agent series. It is currently more applicable to synthetic polysilane coupling agents, amino groups. Silane coupling agent or the like. [0003] At present, the large industrial production of 3-chloropropyl trichlorosilane is prepared from the production of silicon hydrogen addition reaction under catalyst conditions under catalyst conditions. The exhaust gas components emitted in the synthesis process are mainly: trichlorosilicon, silicon tetrachloride, propyl trichlorosilane, propylene, and the like. The components in the synt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/04C08G77/06
CPCC08G77/04C08G77/06
Inventor 陶再山李春华
Owner 南京曙光新材料有限公司