Reaction system and method for preparing ethylene through acetylene hydrogenation

Abstract

The invention relates to a reaction system for preparing ethylene through acetylene hydrogenation. The reaction system is a gas phase-liquid phase two-phase contact reaction system. By means of the system, a traditional solid catalyst can be replaced by a liquid-phase catalyst, so that a traditional gas-solid two phase or gas-liquid-solid three-phase contact reaction is changed into a gas-liquid contact reaction, and coverage of the catalyst activity center by produced green oil is avoided; meanwhile, the hydrogenation activity of the liquid-phase catalyst is under the suitable condition through regulation of proportions of different kinds of complexation metals in the liquid-phase catalyst, the high conversion rate of acetylene is guaranteed, production of the green oil due to self-polymerization of acetylene is avoided, and production of ethane through deep acetylene hydrogenation can be inhibited. The invention further relates to a method for preparing the ethylene with the reaction system. By means of the method, the selectivity of production of the ethylene through acetylene hydrogenation is improved and the yield of the ethylene in product gas is increased.

Description

technical field [0001] The invention belongs to the technical field of gas treatment and processing methods, and in particular relates to a high-concentration acetylene hydrogenation reaction system and method for producing ethylene. Background technique [0002] With the depletion of petroleum resources, the development of coal chemical industry as a raw material chemical process has become an important process to replace the petrochemical route, which has attracted widespread attention and achieved rapid development. In coal chemical technology, the production of acetylene by using coal as raw material through calcium carbide process has been widely used. Using acetylene as raw material under the action of selective hydrogenation catalyst to produce ethylene products through hydrogenation can further expand the route of coal chemical industry. And in recent years, the main downstream product of acetylene, polyvinyl chloride (PVC), has been oversupplied, and the PVC industr...

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Problems solved by technology

[0004] Furthermore, in the slurry bed process for preparing ethylene by hydrogenation of acetylene disclosed in the prior art, although the solvent used can fully dissolve acetylene, when the reaction temperature is too high or hydrogen is insufficient, the acetylene adsorbed by the active center will easily generate a large amount of Green oil causes catalyst deactivation resulting in lower ethylene yield

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