Method and system for removing carbon dioxide in reaction gas and application thereof

A carbon dioxide and reaction gas technology, applied in chemical instruments and methods, separation methods, organic chemistry, etc., can solve the problems of increased steam consumption in decarbonization systems, and achieve the goal of reducing required steam, increasing gas temperature, and reducing energy consumption. Effect

Active Publication Date: 2020-07-31
SINOPEC NANJING RES INST OF CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] As the total gas volume is decarbonized, the circulating gas volume doubles. The temperature in the absorption tower exceeds 100°C, while the temperature of the circulating gas returning to the oxidation reactor is required to be less than 40°C. The gas is hot and cold, bringing out a large amount of heat, and the steam in the decarburization system Consumption will inevitably increase

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  • Method and system for removing carbon dioxide in reaction gas and application thereof

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Effect test

Embodiment 1

[0124] A certain scale of 70,000 tons / year of ethylene synthesizes ethylene oxide under the action of a silver catalyst, and the by-reaction product of the oxidation synthesis reaction is CO 2 The decarburization unit adopts potassium carbonate decarburization process. In order to use a highly selective catalyst, the CO in the recycle gas at the reactor inlet needs to be 2 The concentration is reduced from 2% to less than 1%, so the amount of reaction tail gas entering the decarbonization system is increased from 50% to 100%, that is, from 83654.2kg / h to 164284.7kg / h. The tail gas is pressurized by the compressor, and the reaction gas with a pressure of 1.82MPa(A) and a temperature of 56.5°C enters the system of the present invention, and the gas volume is 164284.7kg / h, of which CO 2 Concentration 1.59mol%, ethylene concentration 28.02mol%, O 2 Concentration 5.86mol%, the rest is CH 4 、C 2 h 6 , N 2 , Ar and a small amount of water vapor and MEG. Using the process of th...

Embodiment 2

[0135] A newly-built 800,000-ton / year ethylene oxide / ethylene glycol plant, the oxidation synthesis reaction is completed under the action of silver catalyst, and the side reaction product CO 2 The removal unit adopts hot potassium carbonate decarburization process. The reaction gas with a pressure of 2.40MPa(A) and a temperature of 56.6°C enters the decarburization system, and the circulating gas volume is 1774479.3kg / h, of which CO 2 Concentration 1.71mol%, ethylene concentration 28.50mol%, O 2 Concentration 5.97mol%, the rest is CH 4 、C 2 h 6 , N 2 , Ar and a small amount of water vapor and MEG. Adopt technology of the present invention, flow process is identical with embodiment 1, because scale is big, under the situation that reaches same carbon dioxide removal effect, steam consumption is from common hot potassium carbonate decarburization process (that is to directly decarburize reaction gas with decarburization liquid) carbon treatment without heat recovery measu...

Embodiment 3

[0137] A newly built 200,000 tons / year ethylene refined ethylene oxide plant, the oxidation synthesis reaction is completed under the action of a silver catalyst, and the side reaction product CO 2 The removal unit adopts hot potassium carbonate decarburization process.

[0138] The reaction cycle gas with a pressure of 2.38MPa(A) and a temperature of 49.2°C enters the decarbonization system, and the amount of cycle gas is 668822.04kg / h, of which CO 2Concentration 1.44mol%, ethylene concentration 28.61mol%, O 2 Concentration 5.68mol%, the rest is CH 4 、C 2 h 6 , N 2 , Ar and a small amount of water vapor and MEG. Adopt technology of the present invention, flow process is substantially the same as embodiment 1, under the situation of reaching same carbon dioxide removal effect, steam consumption is from common hot potassium carbonate decarburization process (that is to directly carry out decarburization treatment to reaction gas with decarburization liquid, Instead of ado...

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Abstract

The invention discloses a method for removing carbon dioxide in reaction gas. The method comprises the following steps: dividing the reaction gas into two paths I and II, heating the two paths I and II by using regenerated gas and washing water, combining to obtain a gas flow III; carrying out a decarburization treatment on the gas flow III by using a decarburization solution to obtain a gas flowIV, cooling by using washing water to obtain purified gas, wherein washing water is cooled at first, then exchanges heat with the airflow IV, then exchanges heat with the second strand of decarburization liquid and the airflow II in sequence, and returns to a cooling device for cooling circulation, the decarburization solution is a tower kettle barren solution from a regeneration tower and is divided into two streams, the first stream is directly contacted with the gas flow III to obtain a first rich solution, and the second stream is firstly subjected to heat exchange with the low-temperaturerich solution, then subjected to heat exchange with washing water and finally is contacted with the gas flow III to obtain a second rich solution. Not more than 30% of reaction gas can be directly combined with the purified gas without the aforementioned treatment and is circulated back to the reactor. The content of carbon dioxide in the gas circulated back to the reactor is obviously reduced, and the steam consumption during rich solution regeneration is reduced by more than 30%.

Description

technical field [0001] The invention relates to a method, system and application for removing carbon dioxide in reaction gas, in particular to a method, system and application for removing carbon dioxide in ethylene oxide reaction cycle gas. Background technique [0002] High-purity ethylene is oxidized with pure oxygen to generate ethylene oxide (EO), and a certain amount of CO is produced during the oxidation of ethylene to ethylene oxide. 2 , which must be removed from the synthesis recycle gas in order to maintain catalytic reaction efficiency. [0003] With the development and application of new highly selective oxidation catalysts, the amount of ethylene used in the production of ethylene oxide has been continuously reduced, and it is also required that CO in the cycle gas 2 The concentration is lower, from the original 5 mol% to 2 mol%, and then requires less than 1 mol%. To carry out transformation under the solvent and process conditions of the original cycle gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/62B01D53/78B01D53/96
CPCB01D53/62B01D53/78B01D53/96B01D2251/306B01D2251/606B01D2257/504Y02A50/20Y02C20/40B01D53/1475B01D2252/10C07D301/10B01D53/1425
Inventor 王祥云张叶徐莉
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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