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Treatment method of acid gas in process of recovering ethylene from refinery dry gas

A technology of refinery dry gas and treatment method, applied in the field of gas purification, can solve the problems of long process flow and waste lye generation, and achieve the effects of simplifying the process, reducing system energy consumption, and reducing pollution emissions

Inactive Publication Date: 2017-12-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, these technologies all have defects such as long process flow and generation of waste lye.

Method used

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  • Treatment method of acid gas in process of recovering ethylene from refinery dry gas
  • Treatment method of acid gas in process of recovering ethylene from refinery dry gas

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The catalytic dry gas of a refinery unit is 32t / h, and the pressure is 1.1MPa, of which, H 2 S ~ 0.8% (vt) and CO 2 ~3.2% (vt), after the amine solution of the present invention (MDEA2.0mol / l, cyclic amine 0.4mol / l) is treated by an absorption tower, the H in the gas 2 S≤5μL.L -1 , CO 2 ≤50μL.L -1 .

Embodiment 2

[0031] After changing the absorption liquid in the comparative example to the absorption liquid of the present invention (MDEA2.3mol / l, cyclic amine 0.3mol / l), the circulation volume of the solution drops to 9 t / h, which greatly reduces the regeneration load of the amine liquid , has a significant energy-saving effect; H in the concentrated gas is extracted after amine washing 2 S≤5μL.L -1 , CO 2 ≤50μL.L -1 . , Eliminate the alkali washing process, reduce the alkali consumption of the ethylene plant alkali washing process, and reduce the discharge of spent alkali.

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Abstract

The invention belongs to the technical field of gas purification, and relates to a treatment method of acid gas in a process of recovering ethylene from refinery dry gas. The invention adopts an amine with a special structure and an MDEA aqueous solution as an absorbent. The amine with the special structure is an ethanolamine, wherein a nitrogen atom of the amine group is located in a six-membered ring compound. The absorbent can remove carbon dioxide deeply while removing hydrogen sulfide. Compared with the prior art, the absorbent can omit a process of removing CO2 from NaOH, simplifies the flow, reduces pollution emissions and reduces system energy consumption.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to a treatment method for acid gas in the process of recovering ethylene from refinery dry gas. Background technique [0002] Refinery dry gas mainly comes from the secondary processing of crude oil, such as catalytic cracking, thermal cracking and delayed coking, etc. Dry gas contains hydrogen, nitrogen, methane, ethylene, ethane, etc. Before there is no suitable separation recovery and comprehensive utilization technology , Most of the dry gas is used as fuel gas or burned by torching, resulting in waste of resources and environmental pollution. Therefore, the recovery of ethylene and light hydrocarbons in dry gas has become an important means for refining and chemical integration to optimize resource utilization and reduce ethylene production costs. [0003] To recover ethylene from dry gas, the dry gas must be refined, and an important step is to remove H 2 S and CO 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/52B01D53/62B01D53/78B01D53/96
CPCB01D53/526B01D53/78B01D53/96B01D2259/4516Y02A50/20Y02C20/40
Inventor 毛松柏朱道平杨绪甲周志斌余勇陈园园宋丽
Owner CHINA PETROLEUM & CHEM CORP
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