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Method for enabling tail gas discharge of reaction circulation gas decarbonization to reach 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 unreasonable economics and unaffordable enterprises

Active Publication Date: 2016-04-13
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 enabling tail gas discharge of reaction circulation gas decarbonization to reach environmental protection index

Examples

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Effect test

Embodiment 1

[0026] A coal -making oil device with a scale of 1 million tons / year, its Feito synthetic reaction reaction cyclic gas removal side reaction product CO 2 The decarburized unit uses potassium carbonate decarburization process.Pressure 1.8MPa (absolute pressure) Cycle gas enters the decarburization system, with a circulating gas volume of 375650.00nm 3 / h, where CO 2 Concentration is 15.795mol%, the concentration of hydrocarbons is 22.966mol%, and the concentration of alcohol, acid, and ketone is 1.033 mol%.Absorb CO 2The non -methane content in the latter is 74.93kg / h, and the content of alcohol, acid, and ketone is 1236.81kg / h.After 1.2MPa (pressure), the flash steaming slot was performed, and the non -methane hydae content in the flickering fluid was reduced to 37.5kg / h, and the content of alcohol, acid, and ketone was reduced to 234.59kg / h.After the flashing section of the flash steaming slot is separated from the top of the flashing slot, the gas pipe network will be directly s...

Embodiment 2

[0030] Ethylene ethylene device with a scale of 200,000 tons / year, its oxidation synthetic reaction cyclic gas removal side reaction product CO 2 The decarburized unit adopts potassium carbonate decarburization process.Pressure 2.38MPa (absolute pressure) Cyclic gas enters the decarburization system, with a circulating gas volume of 668822.04kg / h, of which CO 2 Concentration 1.44mol%, ethylene concentration 28.61mol%, O 2 The concentration is 5.68mol%, 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 non -methane content in the latter -rich liquid is 322.11kg / h, and through 1.2MPa (pressure), the flickering flickering groove is reduced, and the non -methane content in the flickering fluid after medium pressure is reduced to 87.5kg / hEssenceAfter the flashing section of the flash steaming slot is separated and separated, the system can be compressed to return to the system; it can also send it to the gas pipe network.

[0031] The low -pres...

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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 present invention is the field of atmospheric environmental protection, which involves a synthetic circular gas containing a large amount of organic matter. 2 Later, the solution regenerative tail gas discharge to the environmental protection indicators. Background technique [0002] In some reactions, it will generate a by -product CO 2 To prevent CO 2 Cumulative accumulation, after reflecting the tower tail gas separation product 2 Remove the reactor below the indicator, which is the reaction of the cycling gas decarburization.For example, co and h 2 Synthetic hydrocarbon (oil) Feito synthesis, there is a by -product CO 2 generate.After the oil is separated, the tail gas is separated from the carbon unit to remove the CO 2 , Cycling gas return to Feito.Another example, o 2 C 2 H 4 (Ethylene) oxidation reaction also generates by by -product CO 2 EssenceDivide the tail gas removal of ethylene oxide 2 After that, the circular gas returns oxidation synthe...

Claims

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Application Information

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Patent Type & Authority Applications(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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