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Method for absorbing and separating refinery catalytic dry gas by adopting oil

A technology for oil absorption and refinery, applied in the direction of adsorption purification/separation, organic chemistry, etc., can solve the problems of high energy consumption and large investment, and achieve the effect of low energy consumption, low investment and increased ethylene production

Active Publication Date: 2010-06-30
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0011] In order to solve the problems of large investment and high energy consumption in the existing process of recovering ethylene from the catalytic dry gas of the refinery, the present invention proposes an efficient method for separating the catalytic dry gas of the refinery by using the oil absorption method

Method used

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  • Method for absorbing and separating refinery catalytic dry gas by adopting oil

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Embodiment 1

[0050] The composition of catalytic dry gas, C4 absorbent and naphtha in a refinery is shown in Table 1.

[0051] Table 1

[0052]

[0053]

[0054] The above-mentioned catalytic dry gas is separated by adopting the oil absorption method of the present invention to separate the refinery catalytic dry gas process.

[0055] The specific process is:

[0056] The catalytic dry gas from the catalytic cracking unit of the refinery, with a pressure of 0.8MPa, enters the compressor 8 and undergoes three-stage compression to increase the pressure to 4.8MPa. The pressurized dry gas is cooled to 10°C by the cooler 9, and then sent into the main absorption tower 10. In the main absorption tower, the etherified C4 produced by the refinery (see Table 1 for the specific composition) is used as the absorbent 2, which is injected from the top of the tower to absorb the C2 fraction and heavier components in the dry gas. The theoretical plate number of the main absorption ...

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Abstract

The invention discloses a method for absorbing and separating refinery catalytic dry gas by adopting oil. The method comprises the following steps of: absorbing a C2 fraction and heavier components in the compressed and cooled catalytic dry gas in a main absorption tower by using a C4 fraction containing normal butane, 1-butylene and 2-butylene as an absorbent, sending a tower kettle material flow of the main absorption tower to a desorption tower for processing and obtaining reclaimed C2 concentrated gas from the top of the desorption tower. By using the method, because the absorption temperature is high, ethylene and propylene are not needed for refrigerating a compressor and an expander, and the method has low energy consumption, less investment and simple operation.

Description

technical field [0001] The invention relates to a method for separating catalytic dry gas in a refinery, in particular to a method for recovering C2 olefins and alkanes in the catalytic dry gas in a refinery by adopting oil absorption separation. 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 present, the methods fo...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C7/12
Inventor 程建民李东风刘智信廖丽华过良王婧
Owner CHINA PETROLEUM & CHEM CORP
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