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 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

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