A decarburization process suitable for high hydrocarbon and carbon dioxide rich gas

A carbon dioxide-enriched and dehydrocarbon technology, applied in the field of carbon dioxide dehydrocarbon purification, can solve problems such as wasting energy, and achieve the effects of reducing production costs, reducing losses, and saving production space

Active Publication Date: 2017-06-16
SICHUAN TECHAIRS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a dehydrogenation process suitable for high-hydrocarbon-rich carbon dioxide gas, from the perspective of energy saving and consumption reduction, the process flow is changed, and the problem of wasting energy due to the heating of a large amount of carbon dioxide that does not participate in the combustion reaction is solved

Method used

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  • A decarburization process suitable for high hydrocarbon and carbon dioxide rich gas
  • A decarburization process suitable for high hydrocarbon and carbon dioxide rich gas

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Such as figure 1 As shown, a dehydrocarbonization process suitable for high-hydrocarbon-rich carbon dioxide-rich gas uses refinery dry gas PSA tail gas as raw material gas, and the carbon dioxide content in the gas accounts for about 90%, and the remaining 10% is impurity gases such as hydrocarbons. The process is as follows step:

[0026] A. Pass the carbon dioxide-rich feed gas into the compressor, and after compression, pass the carbon dioxide-rich feed gas through two sets of polyimide membrane modules connected in parallel to separate the carbon dioxide-rich feed gas into two streams with a flow ratio of 1:1. One is permeate gas with hydrocarbon content less than 0.02%, and the other is permeate gas with hydrocarbon content up to 20%;

[0027] B. Desulfurize the permeate and permeate gas after re-compression;

[0028] C. Introduce the permeated gas after desulfurization treatment into the heater for heating;

[0029] D. Dehydrogenation of the permeated gas heat...

Embodiment 2

[0033] Such as figure 1 As shown, a dehydrocarbonization process suitable for high-hydrocarbon-rich carbon dioxide-rich gas uses refinery dry gas PSA tail gas as raw material gas, and the carbon dioxide content in the gas accounts for about 90%, and the remaining 10% is impurity gases such as hydrocarbons. The process is as follows step:

[0034] F. Pass the carbon dioxide-rich raw material gas into the compressor. After compression, the carbon dioxide-rich raw gas passes through two sets of polyimide membrane modules connected in parallel to separate the carbon dioxide-rich raw material gas into two gases with a flow ratio of 2:1. One is permeate gas with hydrocarbon content less than 0.02%, and the other is permeate gas with hydrocarbon content up to 30%;

[0035] G. Compress the permeate gas and the permeate gas separately and perform desulfurization treatment;

[0036] H. Introduce the permeated gas after desulfurization treatment into the heater for heating;

[0037] ...

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Abstract

The invention discloses a dehydrocarbon process suitable for high-hydrocarbon-rich carbon dioxide gas, and relates to the field of carbon dioxide dehydrocarbon purification. The pretreated carbon dioxide-rich raw material gas is divided into two streams through an improved polyimide membrane group. One is feed gas with hydrocarbon content less than 0.02%, and the other is feed gas rich in hydrocarbons. The flow ratio of the two gases is about 1:1. By this method, the gas flow rate that needs to be heated up is halved, the power of the heater is halved, and the energy consumption is reduced by 50%. The other stream containing trace hydrocarbons directly enters the next process. Since the hydrocarbon content is very small, It can be directly liquefied into industrial-grade liquid carbon dioxide, or slightly purified as food-grade liquid carbon dioxide.

Description

technical field [0001] The invention relates to the field of dehydrocarbonation and purification of carbon dioxide, in particular to a dehydrocarbonation process suitable for high-hydrocarbon-rich carbon dioxide gas. Background technique [0002] With the deepening of carbon dioxide emission reduction and the continuous heating up of carbon emission trading, more and more attention has been paid to carbon dioxide recovery devices. At present, the most valuable is to produce food-grade and industrial-grade liquid carbon dioxide. The gas source comes from refinery tail gas, Methanol scrubbing tail gas, hydrogen production tail gas and other industrial tail gas. [0003] At present, in the process of using various tail gases to produce liquid carbon dioxide, it is inevitable to deal with various hydrocarbons such as methane, ethane, and propane, such as figure 2 In the prior art flow chart shown, catalytic combustion is used to remove hydrocarbons, and various hydrocarbons are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/50
Inventor 钟雨明钟娅玲王小伟牟树荣肖军刘兴龙王波叶易春
Owner SICHUAN TECHAIRS
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