Dichloroethane prodn. plant via pipe type direct chloration of ethene, and process thereof

Abstract

This invention relates to apparatus and production methods for chemical engineering products, concretely relates to the production apparatus and production method for dichloroethane by direct ethylene chlorification. The production apparatus includes: dichloroethane cycling and chlorine entrance pipelines, instantaneous chlorine mixing pipelines , chlorine solution exit pipelines , dichloroethane cycling and ethylene entrance pipelines and ethylene dispersion mixing pipelines ; and a tube chlorification of ethylene is also proposed. This invention has the advantages that, chlorine and ethylene are predissolved with circulative dichloroethane and no contact in gaseous state between the two promises little byproduct and a high purity. Ratio of ethylene to chlorine is almost theoretical and thus the postprocessing is simple and the production procedure is safe. Besides, the whole production is carried out in pipelines, which requires only low investment while promises a great productivity.

Description

technical field [0001] The invention relates to a production device and a production method of chemical products, in particular to a production device and a production method for generating ethylene dichloride through chlorination of ethylene in the process of preparing vinyl chloride and polyvinyl chloride. technical background [0002] Ethylene and chlorine react with ferric chloride as a catalyst to produce dichloroethane, which can be divided into low-temperature chlorination method and high-temperature chlorination method. The ethylene chlorination technology developed in the early years mostly adopts a low-temperature process, and the reaction is controlled at about 53°C. In order to completely convert the chlorine gas entering the reactor, the amount of ethylene added for low-temperature chlorination is 3-5% more than the theoretical amount. Low-temperature chlorination uses liquid phase discharge, and the reaction product contains catalyst, which must be washed with ...

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Problems solved by technology

[0005] At present, a German company has developed a high-temperature direct chlorination technology using sodium ferrite tetrachloride as a catalyst. The reactor used is a bubble column reactor. The mass transfer effect of this reactor is not good, the production capacity is low, and the product quality is not easy. Guarantee; a Japanese company has developed a bubble column chlorination reactor with a special gas distributor and packing layer. The main defect of this technology is that the operation flexibility is small and the gas distributor is easy to block; The technology of direct ethylene chlorination in the pipeline reactor of internal components, the process flow is as follows image 3 , the reactor structure is as Figure 4 , the design idea and reactor structure of this technology are relatively novel. The published data shows that the reaction temperature is 83-90°C, which belongs to medium-temperature chlorination. The disadvantage is that the purity of the reactants is not high enough.

[0006] The current production technology and production equipment for producing ethylene dichloride by direct chlorination of ethylene are not ideal enough. Therefore, it is very meaningful to provide a new, high-efficiency ethylene dichloride production device and production method

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