Gas-liquid phase vinyl chloride production process and device

Abstract

The invention provides a gas-liquid phase vinyl chloride production process and a device, and belongs to the technical field of chemical product preparation. The production process comprises the following steps: raw materials are treated, wherein raw materials comprise a liquid catalyst and mixed gas composed of hydrogen chloride and acetylene; a hydrochlorination reaction is carried out on acetylene, wherein acetylene reacts with hydrogen chloride to generate vinyl chloride, and the reaction temperature is controlled by a heat exchanger during a reaction process; gas-liquid separation is carried out, wherein generated vinyl chloride gas flows out of a liquid catalyst, and when the vinyl chloride gas passes through a condenser, the liquid catalyst is cooled, liquefied and refluxed to a reaction zone for acting on the reaction again; the liquid catalyst is recovered, and a small amount of the liquid catalyst is separated again by a demister; and the acetylene conversion rate is detected, wherein the liquid catalyst is replaced when the acetylene conversion rate is lower than 95%, and the original liquid catalyst is continuously used for catalytic action when the conversion rate is higher than 95%. The invention aims to solve the problems of temperature runaway phenomenon, surface carbon deposition and low catalytic efficiency caused by a gas-solid reaction in the prior art.

Description

technical field [0001] The invention belongs to the technical field of chemical product preparation, and more specifically relates to a gas-liquid phase vinyl chloride production process and device. Background technique [0002] Vinyl chloride, also known as vinyl chloride, is a kind of halogenated hydrocarbon and an important raw material in the plastics industry. It is mainly used to produce polyvinyl chloride resin (ie PVC, the world's largest general-purpose plastic); it can also be used with vinyl acetate , butadiene, acrylonitrile, acrylate, vinylidene chloride and other copolymers to manufacture adhesives, coatings, food packaging materials, building materials, etc.; it can be used as a refrigerator by taking advantage of its low boiling point; it can also be used as a dye and Extraction agent for spices. [0003] At present, the industrial synthesis methods of vinyl chloride monomer mainly include acetylene hydrochlorination and ethylene oxychlorination. In 2017, th...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a gas-liquid phase vinyl chloride production process and device, aiming to solve the problem of overheating phenomenon and surface area carbon caused by gas-solid reaction in the existing process, and the problem of low catalytic efficiency

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