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Method for recovering ethylene and hydrogen from refinery dry gases by combining cold oil absorption and membrane separation

A cold oil absorption and refinery dry gas technology, which is applied in absorption purification/separation, gas mixture processing, hydrogen separation, etc., can solve the problems of low yield, inability to realize refinery dry gas, low purity, etc., and achieve improvement Purity, lower operating costs, less interference effects

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

AI Technical Summary

Problems solved by technology

[0008] The invention provides a method for recovering ethylene and hydrogen by combining dry gas in a refinery with oil absorption and membrane separation, and solves the problem of low yield, low purity and inability to realize dry gas in a refinery when recovering hydrogen and ethylene from dry gas in a refinery in the past. Problems with complete clean separation of major components

Method used

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  • Method for recovering ethylene and hydrogen from refinery dry gases by combining cold oil absorption and membrane separation
  • Method for recovering ethylene and hydrogen from refinery dry gases by combining cold oil absorption and membrane separation
  • Method for recovering ethylene and hydrogen from refinery dry gases by combining cold oil absorption and membrane separation

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Embodiment 1

[0033] Such as figure 1 As shown, the method for the refinery dry gas cooling oil absorption, membrane separation and combined recovery of ethylene and hydrogen described in this embodiment comprises the following steps:

[0034] (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;

[0035] (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;

[0036] (3) Membrane separation: The non-con...

Embodiment 2

[0041] Such as figure 1 As shown, the method for the refinery dry gas cooling oil absorption, membrane separation and combined recovery of ethylene and hydrogen described in this embodiment comprises the following steps:

[0042] (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;

[0043] (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;

[0044] (3) Membrane separation: The non-conden...

Embodiment 3

[0049] Such as figure 1 As shown, the method for the refinery dry gas cooling oil absorption, membrane separation and combined recovery of ethylene and hydrogen described in this embodiment comprises the following steps:

[0050] (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;

[0051] (3) Membrane separation: The non-condensable gas discharged from the top of the absorption tower in step (2) enters the membrane separation system under the condition of 3.6 MPa pressure and normal temperature, and the product hydrogen is obtained on the permeation side of the membrane. The purity of hydrogen is 99%, which is very Permeate returns to step (1...

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Abstract

The invention discloses a method for recovering ethylene and hydrogen from refinery dry gases by combining membrane separation and cold oil absorption. 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, membrane separation, desorption, normal coarse distillation and the like; the main components are clearly separated; meanwhile, under the actions of cold oil absorption and membrane separation, the purity of various components can be more than 99%, the yield of hydrogen can reach 90-95%, and the yield of ethylene is 92-98%; the whole recovery flow is reasonable; the method has the characteristics of high yield, high purity, low operating cost and relatively 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 through combination of refinery dry gas cooling oil absorption and membrane separation. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/00C07C11/04C07C7/11C07C7/04C01B3/50C01B3/56
Inventor 蔡跃明钟雨明詹家聪
Owner SICHUAN TECHAIRS
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