A method and device for producing ethylene by hydrogenation of high-concentration acetylene

Abstract

The invention relates to a method for acetylene hydrogenated ethylene production. The method is of gas phase-liquid phase two-phase reaction, a gas phase comprises hydrogen gas and acetylene, and a liquid phase comprises a liquid-phase solvent and a liquid-phase catalyst. The method comprises the following steps: respectively introducing hydrogen gas and acetylene into the liquid phase from different positions of a reaction device, and enabling the interior of the liquid phase to form density difference and then carry out self circulation; and enabling hydrogen gas and acetylene to be subjected to full reaction under the condition of self circulation, and collecting the product. The invention also relates to a device for acetylene hydrogenated ethylene production. According to the device, acetylene and hydrogen gas can be separately fed, and the liquid phase is subjected to self circulation under the action of density difference, so that the efficiency of acetylene hydrogenated ethylene production 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 method and a device for producing ethylene by hydrogenating high-concentration acetylene. 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. [0003] 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 in...

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Problems solved by technology

[0004] The prior art discloses the use of a fixed-bed catalytic hydrogenation process. Since the hydrogenation of alkynes is a strong exothermic reaction, it is difficult for the fixed-bed device to remove heat, and a large amount of reaction heat will deactivate the palladium catalyst due to carbon deposition.

And because of its high activity, acetylene polymerizes to form green oil during the reaction, which covers the surface of the catalyst and causes the catalyst to deactivate rapidly.

[0005] Although the selective hydrogenation of acetylene is a current focus of attention, its research content is mainly used to remove trace amounts of acetylene (0.01-5% by volume) in the process of producing ethylene from petroleum hydrocarbon cracking. Hydrogenation to ethylene has rarely been explored, and the corresponding large-scale industrial application has not been reported.

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