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

A cold oil absorption and refinery technology, which is applied in the processing of gas mixtures, hydrocarbon oil treatment, organic chemistry, etc., can solve the problems of large investment and high energy consumption, and achieve the effect of low investment, reasonable process and easy acquisition.

Inactive Publication Date: 2007-10-31
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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Problems solved by technology

[0010] In order to solve the problems of large investment and high energy consumption in the existing technology for recovering ethylene and propylene from refinery dry gas, the present invention proposes a highly efficient method for separating refinery catalytic dry gas by using an intercooler oil absorption method. The method The liquefied gas from the refinery is used as the absorbent, the absorption temperature is kept as an intercooler, and the expansion machine and the cold box are used to recover the cooling capacity, which greatly increases the recovery rate of ethylene and propylene, reduces the circulation and loss of the absorbent, and reduces the energy consumption

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

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Embodiment 1

[0046] The catalytic dry gas composition of a refinery is shown below.

[0047] Composition Volume % NM 3 / hr

[0048] H2 18.06 5418

[0049] N2 14.52 4366

[0050] O2 0.53 159

[0051] CO2 1.76 528

[0052] CH4 32.00 9600

[0053] C2H4 16.34 4902

[0054] C2H6 14.53 4359

[0055] C3 1.70 510

[0056] C4 0.36 108

[0057] C5 0.20 60

[0058] H2O 0.02 6

[0059] Total 100.00 30000

[0060] The above-mentioned catalytic dry gas is separated by adopting the intercooler oil absorption method of the present invention to separate the refinery catalytic dry gas process. The specific process is:

[0061] The catalytic dry gas from the catalytic cracking unit of the refinery has a pressure of 0.7MPa. After two stages of compression, the pressure is increased to 3.5MPa. The acid gas is removed by alkali washing between the stages of the compressor. The pressurized dry gas is dried and then gradually cooled to -35°C before being sent into the absorption tower. The theoreti...

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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 ...

Claims

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Application Information

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IPC IPC(8): C10G70/04C07C11/04C07C11/06
CPCY02P30/40
Inventor 程建民茅文星李东风戴伟廖丽华王婧
Owner CHINA PETROLEUM & CHEM CORP
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