Method for recovering ethylene and hydrogen from refinery dry gases through cold oil absorption, pressure swing adsorption (PSA) and membrane separation

A pressure swing adsorption and refinery dry gas technology, which is applied in hydrogen separation, hydrocarbon purification/separation, chemical instruments and methods, etc., can solve the problems of low yield, inability to realize refinery dry gas, and low purity, and achieve High yield, reduced operating cost, and improved purity

Active Publication Date: 2014-09-10
SICHUAN TECHAIRS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a method for recovering ethylene and hydrogen from refinery dry gas by cold oil absorption, pressure swing adsorption, and membrane separation, which solves the problems of low yield, low purity and inability to realize the recovery of hydrogen and ethylene from the dry gas of the refinery in the past. The problem of complete and clear separation of main components of plant dry gas

Method used

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  • Method for recovering ethylene and hydrogen from refinery dry gases through cold oil absorption, pressure swing adsorption (PSA) and membrane separation
  • Method for recovering ethylene and hydrogen from refinery dry gases through cold oil absorption, pressure swing adsorption (PSA) and membrane separation
  • Method for recovering ethylene and hydrogen from refinery dry gases through cold oil absorption, pressure swing adsorption (PSA) and membrane separation

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Embodiment 1

[0038] like figure 1 As shown, the method for the refinery dry gas cooling oil absorption, pressure swing adsorption, membrane separation and recovery of ethylene and hydrogen described in this embodiment comprises the following steps:

[0039] (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 of 3.5% and 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;

[0040](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;

[0041] (3) Pressure swing adsorpti...

Embodiment 2

[0047] like figure 1 As shown, the method for the refinery dry gas cooling oil absorption, pressure swing adsorption, membrane separation and recovery of ethylene and hydrogen described in this embodiment comprises the following steps:

[0048] (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;

[0049] (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;

[0050] (3) Pressure swing ads...

Embodiment 3

[0056] like figure 1 As shown, the method for the refinery dry gas cooling oil absorption, pressure swing adsorption, membrane separation and recovery of ethylene and hydrogen described in this embodiment comprises the following steps:

[0057] (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;

[0058] (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;

[0059] (3) Pressure swing adsorptio...

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Abstract

The invention discloses a method for recovering ethylene and hydrogen from refinery dry gases through cold oil absorption, pressure swing adsorption (PSA) and membrane separation. The method has the advantages and beneficial effects that main components such as hydrogen, ethylene and the like are obtained from the refinery dry gases through the steps of compression and pressure increase, cold oil absorption, PSA, membrane separation, desorption, normal coarse distillation and the like; the main components are clearly separated; meanwhile, under the actions of PSA and membrane separation, the purity of various components can be more than 99%, the yield of hydrogen can reach 90-95%, the purity of ethylene is 99%, and the yield of ethylene can reach 92-98%; the whole recovery flow is reasonable; the method has the characteristics of high yield, high purity, low operating cost and lower energy consumption.

Description

technical field [0001] The invention relates to the field of classified recovery of refinery dry gas, in particular to methods for refining dry gas cold oil absorption, pressure swing adsorption, membrane separation and recovery of ethylene and hydrogen. 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 g...

Claims

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Application Information

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IPC IPC(8): C10G70/00C01B3/50C07C11/04C07C7/00
Inventor 蔡跃明钟雨明钟娅玲
Owner SICHUAN TECHAIRS
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