Ethylene product gas separation method and device

Abstract

The invention provides an ethylene product gas separation method and a device, and belongs to the technical field of hydrogen-containing light hydrocarbons separation. The ethylene product gas separation method is used for solving problems in separation process of ethylene product gas in preparation of ethylene via acetylene hydrogenation that ethylene yield is relatively low, process is complex, and energy consumption is relatively large. The ethylene product gas separation method comprises following steps: separation of ethylene product gas obtained in preparation of ethylene via acetylene hydrogenation is carried out in an absorption stripping system, and materials absorbed by an absorbent in the absorption stripping system are delivered into a dethanizing column, wherein the absorbent in the absorption stripping system comprises C4; materials separated via the column top of the dethanizing column are delivered into an ethylene rectification tower, and materials separated via the column bottom of the dethanizing column are delivered into a debutanization column; a part of materials separated via the column top of the debutanization column is delivered into the absorption stripping system as the absorbent, and the other part is discharged. The ethylene product gas separation method is capable of simplifying process and reducing energy consumption without influencing ethylene yield.

Description

Technical field [0001] The invention relates to the technical field of hydrogen-containing low-carbon hydrocarbon separation, in particular to a method and device for separating ethylene product gas. Background technique [0002] As a basic chemical raw material, ethylene is currently mainly made from petroleum. The characteristics of my country's energy resources are "poor in oil and rich in coal." If coal-based acetylene is converted into ethylene, it can not only reduce my country's dependence on imported oil; it can also alleviate the serious overcapacity of the domestic calcium carbide industry. Compared with the coal-based methanol-to-olefin technology, the coal-based acetylene to ethylene technology has the characteristics of simple process, less construction investment, low production cost, low carbon emissions, low water consumption, and high product added value. At present, the low-concentration acetylene gas solid-phase catalytic hydrogenation technology is very matur...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for separating ethylene product gas to solve the technical problems of low ethylene yield, complicated process and high energy consumption in the separation process of ethylene product gas from acetylene hydrogenation to ethylene in the prior art

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