Method for separating plant catalytic dry gas by employing middle-cool-oil absorption process

Abstract

The invention discloses a separating refinery catalytic dry gas method with middle cold oil absorptive method in separating refinery catalytic dry gas technical domain, which comprises the following steps: compressing; stripping acid gas; drying; purifying; absorbing; desorbing; reclaiming cold energy; crude-separating. This invention possesses cheap cost, low lost, simple operation, little investment and low energy consumption, which can get C2 fraction and ethane.

Description

technical field

[0001] The invention relates to a method for separating catalytic dry gas of a refinery, in particular to a method for separating and recovering olefins and alkanes in the catalytic dry gas of a refinery by adopting an intercooler oil absorption method. Background technique

[0002] Catalytic dry gas in refinery comes from catalytic cracking process. Usually, the content of ethylene in the dry gas is about 12-20 mol%, the content of ethane is about 15-24 mol%, and it also contains alkenes and alkanes such as propylene, propane and butane. At present, catalytic dry gas in refineries is mainly burned as fuel, and its utilization value is low. If the olefins and alkanes in the catalytic dry gas are recovered and sent to the ethylene plant as the raw material for ethylene production, a large amount of cracked raw material oil can be saved, the cost of ethylene production can be greatly reduced, and the enterprise can obtain better economic benefits.

[0003] At ...

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