Propylene recovery device for deethanization tower top tail gas

Abstract

The invention discloses a propylene recovery device for deethanization tower top tail gas, which relates to the technical field of propylene recovery. The propylene recovery device comprises a base, one side of the top end of the base is fixedly provided with a compression type refrigerator, and the top end of the base is sequentially provided with a condensation assembly, a membrane separation assembly and a compression circulation assembly; the condensation assembly comprises an obliquely-arranged condensation cylinder, the upper end and the lower end of the condensation cylinder are fixedly connected with an inlet pipe and an outlet pipe correspondingly, heat exchange mechanisms are installed between the inlet pipe and the compression type refrigerator and between the outlet pipe and the compression type refrigerator, and the ends, facing the condensation cylinder, of the inlet pipe and the outlet pipe are jointly connected with a spiral heat exchange pipe. By means of the spiral attached pieces, the heat exchange area of the spiral heat exchange pipe and tail gas can be increased, and the condensation effect on the tail gas is improved; and on the other hand, a good flow slowing effect on flowing of the tail gas can be achieved in cooperation with the formed circulating groove, a turbulent flow phenomenon can happen to part of the tail gas at the position of the circulating groove, and therefore the heat exchange effect of the tail gas and the cooling medium is further improved.

Description

technical field [0001] The invention relates to the technical field of propylene recovery, in particular to a propylene recovery device for the tail gas at the top of a deethanizer. Background technique [0002] Propylene is one of the basic raw materials of the three major synthetic materials, the largest amount of which is the production of polypropylene. in addition. Propylene can be used to prepare acrylonitrile, propylene oxide, isopropanol, phenol, acetone, butanol, octanol, acrylic acid and its esters, propylene glycol, epichlorohydrin and synthetic glycerol. The non-condensable gas discharged from the deethanizer in the refinery gas separation unit contains about 30% Vol to 70% Vol propylene, and most of this part of propylene is not separated and recovered, but is used as civil gas, and the price of propylene It is relatively expensive, and it is used as civil liquefied gas, which has the problem of waste of resources. [0003] The utility model patent with the p...

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Problems solved by technology

[0004] However, the above-mentioned invention has the following disadvantages: the above-mentioned patent does not refine the condensing design, and the traditional condensing design is relatively simple, and the exhaust gas will pass through the condensing components relatively quickly, resulting in a large discount on the actual condensing effect , and the heat transfer efficiency is average, and the condensation efficiency of exhaust gas is not high, so there are certain limitations

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