Methane chloride recycling and feeding process and device

Abstract

The invention provides a methane chloride recycling and feeding process and device. The process comprises the following specific steps: removing the vast majority of dust from a methane-chloride-containing gas mixture from the top of a reactor via a dust removal system, and then washing the gas mixture via a dust removal tower to remove high-boiling-point substances and fine powder; after condensing a material on the top of the dust removal tower via a cooling system, taking part of the material as a cleaning solution, and feeding the other part of the material to a refining tower; feeding noncondensable gas in the cooling system to a compressing system; carrying out heat exchange on compressed gas and liquid methane chloride via a vaporizer, vaporizing the liquid methane chloride, coolingand condensing the compressed gas, and then feeding the compressed gas into a condenser for further condensing, carrying out tail gas removal treatment on noncondensable gas in the condenser, and feeding condensate to a buffering tank; enabling the methane chloride of the buffering tank and the methane chloride of a storage tank to enter the refining tower together; and enabling a gas phase on the top of the refining tower to enter a partial condenser for partial condensing, and feeding the condensate into a refluxing tank and totally refluxing the condensate into the refining tower. The methane chloride can be recycled effectively, the main content is higher than 99.5%, moreover, the process is simple, the investment of equipment is low, and energy conservation and consumption reductionare implemented.

Description

Technical field

[0001] The invention belongs to the technical field of methylchlorosilane production, and specifically relates to a process and device for the recovery and feeding of raw materials for methylchlorosilane production. Background technique

[0002] In industrial production, methylchlorosilane is mainly synthesized by direct method, and the main raw materials used are silicon powder and methane chloride. The current domestic synthesis level of methylchlorosilane is low, and the conversion rate of methane chloride in a single pass is only 30-50%, which is not converted. The methane chloride needs to be recycled. The traditional methane chloride recycling process is to condense the synthesized product in the reactor after dust removal, the condensate is removed to the crude monomer tower, the non-condensable gas is compressed to a certain pressure, and the methane chloride extracted from the crude monomer tower After being condensed, the material also goes to the methy...

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