3-chloropropyltrichlorosilane synthesis tail gas treatment mechanism and treatment method thereof

Abstract

The invention discloses a harmless treatment mechanism of 3-chloropropyltrichlorosilane synthesis tail gas. The harmless treatment mechanism comprises a reaction chamber, a synthesis chamber, a distillation machine and a neutralization chamber. A treatment method of the 3-chloropropyltrichlorosilane synthesis tail gas comprises the following steps: dissolving and reacting non-condensable gases including trichlorosilane, silicon tetrachloride and propyltrichlorosilane in the 3-chloropropyltrichlorosilane synthesis tail gas by using excess absolute ethyl alcohol absorption liquid under a freezing condition with micro-positive pressure, wherein the non-condensable gases in the 3-chloropropyltrichlorosilane synthesis tail gas after being treated by the process only include hydrogen chloride and purified propylene; adding the non-condensable gases only including hydrogen chloride and purified propylene into the synthesis chamber and carrying out chloride-free treatment; carrying out alcoholysis and hydrolysis of an incompletely-esterified crude product which is the ethyl alcohol absorption liquid after absorbing the non-condensable gases including trichlorosilane, silicon tetrachlorideand propyltrichlorosilane to prepare a polysiloxane product with an additional value. The harmless treatment mechanism is novel in structure; the treatment method is environmentally friendly; the waste can be used and changed into wealth; the economic benefit is improved.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment equipment, and in particular relates to a harmless treatment mechanism and treatment method for 3-chloropropyltrichlorosilane 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. 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 silanes are neutralized and ...

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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 trea

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