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Selective absorption method for reducing propylene in catalytic cracking dry gas

A catalytic cracking and selective absorption technology, applied in absorption purification/separation, chemical instruments and methods, separation methods, etc., can solve problems such as uneconomical

Inactive Publication Date: 2005-11-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not economical if the refinery scale is relatively small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0019] Under the conditions that the absorption tower is 110 cm high, the absorption device with an inner diameter of 32 mm is filled with inert Φ3 spherical packing with a height of about 90 cm, the dry gas enters from the bottom, and the absorbent enters from the top, the following results of Examples 1-7 are obtained. It can be seen from the results of the examples that the larger the adsorbent / dry gas volume ratio, the less propylene in the absorbed dry gas, and the higher the adsorption temperature, the more propylene in the absorbed dry gas.

[0020] Adsorbent / Benzene

[0021] Adsorbent / antihydrocarbon feed

[0022] Adsorbent / Ethylbenzene

[0023] Adsorbent / diesel

[0024] Adsorbent / ethylbenzene / transhydrocarbonate=1 / 1(w / w)

[0025] Adsorbent / ethylbenzene / transhydrocarbonate=1 / 1(w / w)

[0026] Adsorbent / ethylbenzene / transhydrocarbonate=1 / 1(w / w)

Embodiment 8

[0028] Absorbent ethylbenzene / transhydrocarbon feedstock (weight ratio 1 / 1) absorbs catalytic cracking dry gas under the conditions of 10°C, 0.8MPa, and adsorbent / dry gas volume ratio (ml / L) of 11.3 (results See embodiment 5), with N 2 Sweeping gas, under the conditions of 30°C, 0.1MPa, and purge gas / absorbent volume ratio of 5, the continuous purging time is 3 hours. The analysis results show that no methane, ethane, ethylene and propylene gases are detected in the absorbent. It shows that almost all the gas adsorbed by the absorbent is desorbed under this condition. After desorption, the absorbent ethylbenzene / anti-hydrocarbonated material (weight ratio 1 / 1) has been subjected to 10 consecutive adsorption / desorption cycle operations, and the performance is good.

Embodiment 9

[0030] Absorbent ethylbenzene / transhydrocarbon feedstock (weight ratio 1 / 1) absorbs catalytic cracking dry gas under the conditions of 10°C, 0.8MPa, and adsorbent / dry gas volume ratio (ml / L) of 11.3 (results See embodiment 5), with H 2 Sweeping gas, under the condition of 150℃, 1.0MPa, purge gas / absorbent volume ratio of 12, the continuous purging time is 1 hour. The analysis results show that no methane, ethane, ethylene and propylene gases are detected in the absorbent. It shows that almost all the gas adsorbed by the absorbent is desorbed under this condition. After desorption, the absorbent ethylbenzene / anti-hydrocarbonated material (weight ratio 1 / 1) has been subjected to 10 consecutive adsorption / desorption cycle operations, and the performance is good.

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PUM

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Abstract

The propylene absorbing process is to eliminate propylene from catalytically cracked dry gas from oil refinery without any purifying and refining in a propylene selectively absorber. The dry gas and the absorbent are contacted through convection. The absorbent may be benzene, ethyl benzene, diethyl benzene, triethyl benzene, polyethyl benzene, diesel oil, gasoline, etc. or their mixture. The absorption conditions include operation temperature of -10 deg.c to +40 deg.c, pressure of 0.1-3.5 MPa, and the absorbent / dry gas volume ratio of 3-25 ml / L. The desorption conditions for the absorbed absorbent include temperature of 20-300 deg.c, pressure of 0.1-3.5 MPa, the sweeping gas / absorbent volume ratio of 1-15, and the sweeping time of 1-10 hr. The sweeping gas may be N2, H2, methane, ethane, etc. or their mixture. The desorbed absorbent may be reused.

Description

technical field [0001] The invention relates to the field of separation and purification of mixed gas, in particular to a method for reducing propylene in catalytic cracking dry gas through selective absorption. Background technique [0002] In the past ten years, my country's ethylene industry has developed relatively rapidly, and 18 sets of large and medium-sized ethylene production units have been built so far. After 2000, a number of ethylene plants began to be transformed and expanded. By 2005, the national ethylene production capacity will reach 8.4 million tons. There is still a big gap between our country and foreign ethylene industry. Many factors make the cost of ethylene higher than that of foreign countries, thus affecting the development of domestic ethylene. Industry Many oil refineries in my country still use a large amount of catalytic cracking dry gas containing 12% to 25% (volume fraction) of ethylene as gas or burn it with a torch, resulting in waste of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCY02P20/50
Inventor 王清遐徐龙伢刘盛林李建保张银龙
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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