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Method for recovery of ethylene and hydrogen by combination of dry gas cooling oil absorption and pressure swing adsorption in refinery

A pressure swing adsorption and refinery dry gas technology, which is applied in the processing of gas mixtures, chemical instruments and methods, hydrogen separation, etc., can solve the problems of inability to realize refinery dry gas and low purity, so as to reduce investment and reduce Effects of energy consumption and high-yield recovery

Active Publication Date: 2016-10-05
SICHUAN TECHAIRS
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a method for recovering ethylene and hydrogen by combining dry gas absorption of refinery dry gas with cold oil and pressure swing adsorption, which solves the problem of low purity and the inability to realize the main components of refinery dry gas when recovering hydrogen and ethylene from refinery dry gas in the past. Completely clean separation of issues

Method used

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  • Method for recovery of ethylene and hydrogen by combination of dry gas cooling oil absorption and pressure swing adsorption in refinery
  • Method for recovery of ethylene and hydrogen by combination of dry gas cooling oil absorption and pressure swing adsorption in refinery
  • Method for recovery of ethylene and hydrogen by combination of dry gas cooling oil absorption and pressure swing adsorption in refinery

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Embodiment 1

[0029] Such as figure 1 As shown, the method for recovering ethylene and hydrogen in the refinery dry gas cooling oil absorption and pressure swing adsorption combination described in this embodiment comprises the following steps:

[0030] (1) Compression and boosting: the refining process with hydrogen content of 18.5%, ethane content of 14.5%, ethylene content of 16%, methane content of 30%, nitrogen content of 14.5%, carbon dioxide and above components content of 3.5%, acid gas content of 3% After the dry gas (volume ratio) of the plant is compressed by the first stage and the second stage, the pressure is increased to 2.0MPa;

[0031] (2) Cold oil absorption: Cool the refinery dry gas boosted in step (1), and then send it to the absorption tower, the top of the absorption tower discharges non-condensable gas rich in methane, hydrogen and nitrogen, and the bottom of the absorption tower Outflow of absorbed carbon 2 and above components;

[0032] (3) Second-stage pressure ...

Embodiment 2

[0037] Such as figure 1 As shown, the method for the described refinery dry gas cooling oil absorption and pressure swing adsorption combined recovery of ethylene and hydrogen comprises the following steps:

[0038] (1) Compression and boosting: the refining process with hydrogen content of 46.5%, ethane content of 12.4%, ethylene content of 6.0%, methane content of 20%, nitrogen content of 9.5%, carbon dioxide and above components content of 2.2%, and acid gas content of 3.2% After the plant dry gas (volume ratio) is compressed by the first stage and the second stage, the pressure is increased to 2.8MPa;

[0039] (2) Cold oil absorption: Cool the refinery dry gas boosted in step (1), and then send it to the absorption tower, the top of the absorption tower discharges non-condensable gas rich in methane, hydrogen and nitrogen, and the bottom of the absorption tower Outflow of absorbed carbon 2 and above components;

[0040] (3) Second-stage pressure swing adsorption: the non...

Embodiment 3

[0045] Such as figure 1 As shown, the method for the described refinery dry gas cooling oil absorption and pressure swing adsorption combined recovery of ethylene and hydrogen comprises the following steps:

[0046] (1) Compression and boosting: the refining process with hydrogen content of 18.5%, ethane content of 14.5%, ethylene content of 16%, methane content of 30%, nitrogen content of 14.5%, carbon dioxide and above components content of 3.5%, acid gas content of 3% After the plant dry gas (volume ratio) is compressed by the first stage and the second stage, the pressure is increased to 3.6MPa;

[0047] (2) Cold oil absorption: Cool the refinery dry gas boosted in step (1), and then send it to the absorption tower, the top of the absorption tower discharges non-condensable gas rich in methane, hydrogen and nitrogen, and the bottom of the absorption tower Outflow of absorbed carbon 2 and above components;

[0048] (3) Second-stage pressure swing adsorption: the non-conde...

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Abstract

The invention discloses a method for recovering ethylene and hydrogen by combining dry gas in a refinery with cold oil absorption and pressure swing adsorption. The dry gas in a refinery is compressed and boosted, absorbed by cold oil, crude hydrogen is extracted by one stage of pressure swing adsorption, and refined by two stages of pressure swing adsorption. Hydrogen, desorption, normal crude distillation and other steps are used to obtain main components such as hydrogen and ethylene, and the main components are clearly separated. At the same time, under the action of pressure swing adsorption and membrane separation, the purity of each component can reach 99%. % or more, the yield of hydrogen can reach 90-95%; the yield of ethylene can reach 92-98%. The entire recovery process is reasonable, and has the characteristics of high yield, high purity, low operating cost and low energy consumption.

Description

technical field [0001] The invention relates to the field of classified recovery of refinery dry gas, in particular to a method for recovering ethylene and hydrogen by combining cold oil absorption and pressure swing adsorption of refinery dry gas. Background technique [0002] The useful components in refinery dry gas are mainly hydrogen, light olefins and light alkanes. These components are very valuable in refinery dry gas, but at present, a large amount of them have not yet been optimally utilized, but are directly used as fuel, and some are even directly ignited to vent. Refinery dry gas contains not only hydrogen, but also a large amount of light olefins and light alkanes. These components can be separated and used separately, which is more beneficial than using them directly as fuel or raw materials for reforming hydrogen production and synthesizing methanol. [0003] The technologies for recovering hydrogen, light olefins and light alkanes from refinery dry gas mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G70/00C01B3/50C07C11/04C07C7/00
Inventor 钟雨明陈运张学文蔡跃明
Owner SICHUAN TECHAIRS
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