Improved technology for synthesizing VCM by calcium carbide process

Abstract

The invention discloses an improved technology for synthesizing VCM by a calcium carbide process. The improved technology comprises the following steps: firstly, reacting calcium carbide with water toobtain a carbide slag slurry and introducing the carbide slag slurry into a calcium chloride converter; secondly, enabling acetylene obtained in the first step and HCL to enter a mixer to obtain mixed gas and enabling the mixed gas to enter a VCM converter filled with a mercury chloride catalyst for converting; thirdly, enabling coarse VCM converted in the second step to enter the calcium chloride converter to obtain a coarse calcium chloride solution; after precipitating and filtering, preparing calcium chloride by a three-effect concentrator; fourthly, feeding the coarse VCM treated in thethird step into a gasometer; compressing and condensing the coarse VCM from the gasometer into a liquid, then drying with a solid alkali drier, refining by using a low-boiling tower and a high-boilingtower and then feeding into a refined VCM storage tank for polymerization. The improved technology for synthesizing the VCM, disclosed by the invention, has the advantages that the carbide slag slurry is transformed into a high added value product calcium chloride; in addition, the coarse VCM is subjected to caustic wash, so that the quality of the VCM is ensured; moreover, the discharge of wasteliquid is reduced.

Description

Technical field [0001] The invention relates to an improved technique for synthesizing VCM by a calcium carbide method. Background technique [0002] The existing use of calcium carbide acetylene to synthesize VCM is a commonly used method. The mechanism is that acetylene and hydrogen chloride use mercury chloride as a catalyst to synthesize VCM. Among them, acetylene is obtained from calcium carbide and water, but a large amount of Calcium carbide slurry not only hinders the production rate of acetylene, but also has the problem of environmental pollution and high energy consumption. In addition, the crude VCM produced by the reaction of acetylene and hydrogen chloride also contains unreacted HCL, which needs to be washed with water and alkali. A lot of waste water. Summary of the invention [0003] The present invention provides an improved process for synthesizing VCM by calcium carbide method, which not only converts calcium chloride slurry into calcium chloride, a high value...

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Problems solved by technology

[0002] The existing method of using calcium carbide acetylene to synthesize VCM is a commonly used method. Its mechanism is that acetylene and hydrogen chloride use mercuric chloride as a catalyst to synthesize VCM. Acetylene is obtained through calcium carbide and water, but a large amount of Calcium carbide slurry not only hinders the production rate of acetylene, but also pollutes the environment and consumes high energy. In addition, the crude VCM produced by the reaction of acetylene and hydrogen chloride also contains unreacted HCL, which needs to be washed with water and alkali. a lot of waste water

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