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Method for Reaction Recycle Gas Decarbonization Tail Gas Emission Reaching Environmental Protection Index

A technology for decarbonizing tail gas and circulating gas, which is applied in separation methods, chemical instruments and methods, and air quality improvement, and can solve problems such as unbearable for enterprises and unreasonable economy.

Active Publication Date: 2018-09-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Economically unreasonable and unbearable for enterprises

Method used

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  • Method for Reaction Recycle Gas Decarbonization Tail Gas Emission Reaching Environmental Protection Index

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Effect test

Embodiment 1

[0026] A coal-to-liquids unit with a scale of 1 million tons / year, the Fischer-Tropsch synthesis reaction cycle gas removes the by-reaction product CO 2 The decarburization unit adopts potassium carbonate decarburization process. The pressure is 1.8 MPa (absolute pressure) and the circulating gas enters the decarburization system, and the circulating gas volume is 375650.00 Nm 3 / h, where CO 2 The concentration is 15.795 mol%, the concentration of hydrocarbons is 22.966 mol%, and the concentration of alcohols, acids and ketones is 1.033 mol%. Absorb CO 2The content of non-methane hydrocarbons in the final rich liquid is 74.93kg / h, and the content of alcohols, acids and ketones is 1236.81 kg / h. After passing through the 1.2 MPa (absolute pressure) rich liquid medium-pressure flash tank, the content of non-methane hydrocarbons in the flashed rich liquid is reduced to 37.5 kg / h, and the content of alcohols, acids and ketones is reduced to 234.59 kg / h. After the flash gas is c...

Embodiment 2

[0030] For a 200,000-ton / year ethylene-to-ethylene oxide plant, the side reaction product CO is removed from the cycle gas of the oxidation synthesis reaction 2 The decarburization unit adopts potassium carbonate decarburization process. The pressure is 2.38 MPa (absolute pressure). The circulating gas enters the decarbonization system, and the circulating gas volume is 668822.04 kg / h, of which CO 2 Concentration 1.44 mol%, ethylene concentration 28.61 mol%, O 2 Concentration 5.68 mol%, the rest is CH 4 、C 2 h 6 , N 2 , Ar and a small amount of water vapor and MEG. Absorb CO 2 The content of non-methane hydrocarbons in the rich liquid after medium pressure flashing is 322.11kg / h. After passing through the 1.2 MPa (absolute pressure) rich liquid medium-pressure flash tank, the content of non-methane hydrocarbons in the rich liquid after medium-pressure flashing is reduced to 87.5kg / h . After the flash gas is cooled and separated in the washing section at the top of the ...

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Abstract

The invention discloses a method for enabling tail gas discharge of decarbonizing solution regeneration to reach an environmental protection index, after CO2 is removed from synthetic circulation gas containing a large amount of organic matters. After circulation gas decarbonization is performed under the absolute pressure of 1.0-8.0 MPa, a process of desorbing an absorbing pregnant solution comprises medium-pressure flash evaporation, low-pressure flash evaporation and air stripping, and boiling regeneration. Based on the value of the absorption pressure, the medium-pressure flash evaporation can be divided into one-stage or two-stage flash evaporation. A last-stage flash evaporation is performed under the absolute pressure ranging from 0.75-1.6 MPa for separation of H2, CO, and low-carbon hydrocarbons. The low-pressure flash evaporation is carried out under the absolute pressure ranging from 0.1-0.35 MPa, aim at ensuring the relieving rate and concentration of non-methane in the regeneration gas to meet environmental requirements during a process of processing the pregnant solution after flash evaporation into a barren solution through air stripping with a regeneration tower and boiling desorption.

Description

technical field [0001] The invention belongs to the field of atmospheric environmental protection, in particular to a method for removing CO from synthetic cycle gas containing a large amount of organic matter 2 Finally, the exhaust gas emission of solution regeneration reaches the method of environmental protection index. Background technique [0002] CO is produced as a by-product during some reactions 2 , in order to prevent CO 2 The accumulation of CO in the gas needs to be removed after reacting the separation product of the tower tail gas 2 The decarburization of the reaction cycle gas is carried out after the removal is below the target and then sent back to the reactor. For example, CO and H 2 Synthetic hydrocarbons (oil products) Fischer-Tropsch synthesis, with by-product CO 2 generate. The tail gas after oil separation is sent to the decarbonization unit to remove CO 2 , the recycle gas returns to Fischer-Tropsch synthesis. For another example, O 2 and C ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
CPCY02A50/20Y02C20/40
Inventor 王祥云张叶樊玲徐莉
Owner CHINA PETROLEUM & CHEM CORP
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