Environment-friendly treatment method for 3-chloropropyltrichlorosilane synthetic tail gas

Abstract

The invention discloses an environment-friendly treatment method for 3-chloropropyltrichlorosilane synthetic tail gas, and belongs to the technical field of chemical engineering. The environment-friendly treatment method for the 3-chloropropyltrichlorosilane synthesis tail gas comprises the steps of enabling the synthesis tail gas to sequentially pass through a refrigerating system, an absorptionliquid system, a cooling system, a water spraying system, an alkali spraying system and a resin absorption system, and finally, discharging the tail gas after the tail gas is monitored to be qualifiedthrough an incineration system, or obtaining a compressed propylene product through a compression system. All components in the tail gas can be effectively separated from or removed from the tail gasand recycled or subjected to next-step environment-friendly treatment, the environment-friendly problem of a traditional tail gas treatment process is solved, the generation of wastes is effectivelyavoided, the factory environment is improved, and a brand new idea is provided for the treatment method of the synthetic tail gas. In addition, propylene gas in the tail gas can also be made into a product, so that the additional value of byproducts is increased, the production cost of 3-chloropropyltrichlorosilane is reduced, and energy saving and emission reduction are achieved.

Description

technical field [0001] The invention relates to the environmental protection treatment of chemical synthesis tail gas, more specifically, relates to an environmental protection treatment method of 3-chloropropyl trichlorosilane synthesis tail gas. 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. It is widely used in the synthesis of bis[propyltriethoxy Silane] polysulfide, aminopropyltriethoxysilane, etc. At present, in large-scale industrial production, the synthesis of 3-chloropropyl trichlorosilane generally adopts the addition reaction of trichlorosilane and chloropropene under a platinum catalyst. During the reaction process, there are mainly by-products silicon tetrachloride, propyl trichlorosilane Silane, propylene generation, the principle is: [0003] Main reaction: HSiCl 3 +ClCH 2 CH=CH 2 →ClC 3 h 6 SiCl 3 ...

AI Technical Summary

Problems solved by technology

[0010] In the traditional treatment process in this industry, the tail gas is generally condensed through the condenser, and the non-condensable gas enters the water spray scrubber to generate an acidic liquid, and the tail gas is discharged directly; the acidic liquid is neutralized with quicklime, caustic soda, etc. The liquid eventually becomes a hazardous waste that is difficult to handle, and the straight-line unorganized waste gas is discharged into the atmosphere, causing pollution to the environment

With the promulgation of environmental protection policies, the traditional treatment process can no longer meet the needs of the development of the times

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