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Device and method for separating refinery dry gas through oil absorption

An oil absorption and refinery technology, applied in the direction of absorption and purification/separation, processing of gas mixture, treatment of hydrocarbon oil, etc., can solve the problems of high energy consumption, large investment, large loss of absorbent, etc., and achieve low energy consumption and investment. Less effect, less absorbent loss

Inactive Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In order to solve the problems of large investment, high energy consumption and large loss of absorbent in the process of recovering ethylene and propylene from refinery dry gas in the prior art, the present invention provides a process that adopts oil absorption to separate refinery dry gas Device and method

Method used

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  • Device and method for separating refinery dry gas through oil absorption

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Embodiment

[0048] Such as figure 1 As shown, a device that adopts oil absorption and separation of refinery dry gas includes a carbon four absorption tower 8 and a carbon four desorption tower 10, the bottom of the carbon four absorption tower 8 is connected to a catalytic dry gas inlet pipeline, and the catalytic dry gas inlet pipeline is provided with Compressor 7 and condenser, the bottom of carbon four absorption tower 8 connects carbon four desorption tower 10, the bottom of carbon four desorption tower 10 connects carbon four absorption tower 8 tops, carbon four desorption tower 10 tops communicate with the outside, in described carbon four absorption tower After 8, the gasoline absorption tower 9 is set, and the outlet of the carbon four absorption tower 8 top is connected to the bottom of the gasoline absorption tower 9, and the bottom and the top of the gasoline absorption tower 9 are connected to the outside world respectively.

[0049] The specific process is as follows:

[0...

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Abstract

The invention discloses a device and a method for separating refinery dry gas through oil absorption. The device comprises a C4 absorption tower and a C4 desorption tower. A gasoline absorption tower is arranged after the C4 absorption tower. A top outlet of the C4 absorption tower is connected to the lower part of the gasoline absorption tower. The bottom and the top of the gasoline absorption tower respectively communicate with the outside world. The method comprises the steps that: catalytic dry gas is subjected to compression and cooling, and is delivered into the C4 absorption tower and is absorbed by using a C4 absorption agent; the tower kettle material of the C4 absorption tower is delivered into the C4 desorption tower; the tower kettle material of the C4 desorption tower is delivered back to the C4 absorption tower; tower top gas of the C4 absorption tower is delivered into the gasoline absorption tower and is absorbed by a gasoline absorption agent. According to the invention, no equipment such as ethylene cooling machine, expansion machine, or cold box is needed, such that investment and energy consumption are reduced.

Description

technical field [0001] The invention relates to the field of organic chemical industry, and more specifically relates to a device and method for separating dry gas from refinery by oil absorption. 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 recovering ethylene from catalytic dry gas in re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/00C10G70/06C07C7/11C07C11/04
CPCY02P20/51Y02P20/50
Inventor 程建民李东风廖丽华刘智信过良李琰王婧罗淑娟王宇飞
Owner CHINA PETROLEUM & CHEM CORP
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