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Method for refining catalysis drying gas by using oil absorption extraction

A technology of oil absorption and refinery, applied in the direction of absorption purification/separation, organic chemistry, etc., can solve the problems of high energy consumption, large investment, reduce investment and energy consumption, etc., achieve low energy consumption, less investment, and increase ethylene production Effect

Active Publication Date: 2010-06-30
CHINA PETROLEUM & CHEM CORP +1
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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 catalytic dry gas in refineries, the present invention proposes an efficient method for separating catalytic dry gas in refineries by oil absorption method. Hydrocarbons are used as absorbents to keep the absorption temperature at room temperature, no low-temperature refrigerants, ethylene and propylene refrigerators and expanders are not needed, which reduces investment and energy consumption

Method used

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  • Method for refining catalysis drying gas by using oil absorption extraction

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Embodiment 1

[0045] The depentanized oil from the refinery was used as the absorbent, and the compositions of catalytic dry gas, depentanized oil and naphtha were shown in Table 1.

[0046] Adopt oil absorption method of the present invention to separate refinery catalytic dry gas process to separate above-mentioned catalytic dry gas,

[0047] The specific process is:

[0048] The catalytic dry gas 1 from the catalytic cracking unit of the refinery, with a pressure of 0.8MPa, enters the compressor 8, and the pressure is increased to 4.8MPa after three stages of compression. The pressurized catalytic dry gas is cooled to about 40°C by the cooler 9, and then sent into the main absorption tower 10. In the main absorption tower 10, depentanized oil is used as the absorbent 2, which is injected from the top of the tower to absorb the components above the C2 fraction in the catalytic dry gas. The theoretical plate number of the main absorption tower is preferably 45, the operating pressure is ...

Embodiment 2

[0059] Adopt the method of embodiment 1 to separate the catalyzed dry gas that catalytic cracking unit comes, absorbent adopts carbon five cuts, and its main composition is n-pentane 20.1wt%, isopentane 10%, isopentene 28.9wt%, n-pentane 14.7wt% ene, 26.3wt% 2-pentene, the composition of each main stream is shown in Table 3.

[0060] Table 3 The main logistics components

[0061]

[0062]

[0063] In this example, the ethylene recovery was 89.2%.

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Abstract

The invention discloses a method for refining catalysis drying gas by using oil absorption extraction. The method comprises the steps of using the carbon five-hydrocarbon containing pentane as absorbent, absorbing the C2 distillate and more important components in the compressed and cooled catalysis drying gas in a main absorbing tower, sending the matter in the main absorbing tower to a desorbing tower, and recycling the C2 concentrated gas from the top of the desorbing tower. The method of the invention has high absorbing temperature and needs no ethylene, propylene cooling compressor and de-compressor so the energy consumption is less, the investment is low and the operation is simple.

Description

technical field [0001] The invention relates to a method for separating catalytic dry gas of a refinery, in particular to a method for recovering olefins and alkanes in the catalytic dry gas of 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 for r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/11C07C11/02
Inventor 程建民刘智信李东风廖丽华过良王婧
Owner CHINA PETROLEUM & CHEM CORP
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