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Device and method for recovering C2 from catalytic dry gas

A carbon and dry gas recovery technology, applied in chemical recovery, gas mixture processing, organic chemistry, etc., can solve the problems of high energy consumption, high propylene content, large investment, etc., to reduce device investment and energy consumption, and to facilitate operation , The effect of simple device structure

Active Publication Date: 2018-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the high propylene content of the C2 product recovered from catalytic dry gas in the prior art, and the need for other equipment and conditions to make large investment, high energy consumption, and the recombination of C6 and above contained in the circulating absorbent After continuous accumulation, the defects that will seriously affect the performance of the absorbent and the device provide a device and method for recovering carbon dioxide from catalytic dry gas

Method used

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  • Device and method for recovering C2 from catalytic dry gas
  • Device and method for recovering C2 from catalytic dry gas
  • Device and method for recovering C2 from catalytic dry gas

Examples

Experimental program
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Effect test

Embodiment 1

[0060] The catalytic dry gas is compressed to 2MPaG, and then contacted with the absorbent (the flow rate is 23t / h (the flow rate is maintained constant by the recycled absorbent in step (3) and the newly added absorbent)), the absorbent and the catalytic dry gas The contact conditions include: the number of theoretical plates is 35, the pressure is 1.9MPaG, the temperature at the top of the tower is 28°C, and the temperature at the bottom of the tower is 100°C; the unabsorbed light components in step (1) are compressed to 4MPaG and then cooled to 15 After ℃, carry out step (2) again, absorbent (the flow rate is 40t / h (by the absorbent used in step (3) and newly added absorbent to keep the flow constant)) and unabsorbed light components The conditions of partial contact include: the number of theoretical plates is 40, the pressure is 3.8MPaG, the temperature at the top of the tower is 19°C, and the temperature at the bottom of the tower is 116°C; the conditions of rectification...

Embodiment 2

[0062] The catalytic dry gas is compressed to 1MPaG, and then contacted with the absorbent (the flow rate is 30t / h (the flow rate is kept constant by the recycled absorbent in step (3) and the newly added absorbent)), the absorbent and the catalytic dry gas The contact conditions include: the number of theoretical plates is 20, the pressure is 1.1MPaG, the temperature at the top of the tower is 21°C, and the temperature at the bottom of the tower is 77°C; the unabsorbed light components in step (1) are compressed to 5MPaG and then cooled to 10 After ℃, carry out step (2) again, absorbent (flow rate is 35t / h (through the absorbent material recycled in step (3) and newly added absorbent to maintain flow rate constant)) and unabsorbed light group The conditions of partial contact include: the number of theoretical plates is 50, the pressure is 4.5MPaG, the temperature at the top of the tower is 19°C, and the temperature at the bottom of the tower is 136°C; the conditions of rectif...

Embodiment 3

[0064] The catalytic dry gas is compressed to 3MPaG, and then contacted with the absorbent (the flow rate is 20t / h (the flow rate is kept constant by the recycled absorbent in step (3) and the newly added absorbent)), the absorbent and the catalytic dry gas The contact conditions include: the number of theoretical plates is 50, the pressure is 3MPaG, the temperature at the top of the tower is 35°C, and the temperature at the bottom of the tower is 133°C; the unabsorbed light components in step (1) are compressed to 3MPaG and then cooled to 12°C Afterwards, carry out step (2) again, absorbent (flow rate is 52t / h (through the absorbent material recycled in step (3) and newly added absorbent to maintain flow constant)) and unabsorbed light components The contact conditions include: the number of theoretical plates is 28, the pressure is 3MPaG, the temperature at the top of the tower is 20°C, and the temperature at the bottom of the tower is 108°C; the conditions for rectification ...

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Abstract

The invention relates to the field of organic matter recovery from gas and discloses a device and a method for recovering C2 from catalytic dry gas. The device comprises a first absorption tower, a second absorption tower and a second desorption tower which are connected sequentially. The method comprises the following steps: an absorbent makes contact with the catalytic dry gas, so that heavy components of C3 or higher in the catalytic dry gas are absorbed; another adsorbent makes contact with unabsorbed light components, and C2 in the light components is absorbed; a mixture of the absorbentand C2 is subjected to rectification, and C2 and the absorbent are separated. The device is simple in structure and convenient to operate; with adoption of the method, C2 can be recovered from the catalytic dry gas with a high recovery rate, the propylene content of a C2 product is lower, the product is particularly suitable for being used as a raw material of an ethylbenzene device, a propylene refrigerating system and a drying system are not needed, device investment and energy consumption are reduced, heavy components of C6 or higher are separated timely and sent out of a boundary region, and severe influence of the heavy components after continuous accumulation on performance of the absorbent and the device is avoided.

Description

technical field [0001] The invention relates to the field of gaseous organic matter recovery, in particular to a device and method for recovering carbon dioxide from catalytic dry gas. Background technique [0002] Catalytic dry gas comes from the secondary processing of crude oil, such as catalytic cracking, delayed coking and other processes. The dry gas usually contains a large amount of ethylene and ethane components. For example, the molar content of ethane in the catalytic dry gas is about 10-24%, and the molar content of ethylene is about 12-20%. At present, catalytic dry gas is mainly burned as fuel, and its utilization value is low. If the carbon two components in the dry gas are concentrated and the ethylene or ethane in it is recycled, the economic and social benefits are very obvious. One of the ways to utilize the enriched C2 enriched gas is as the raw material for the ethylbenzene plant, but the ethylbenzene plant requires that the propylene content in the ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/06C07C11/04C07C9/06C07C7/11
CPCC07C7/11C10G70/06C07C11/04C07C9/06Y02P20/584
Inventor 邵华伟李东风刘智信胡志彦张敬升邹弋
Owner CHINA PETROLEUM & CHEM CORP
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