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Anti-oxidative non-aqueous decarbonization solution for trapping carbon dioxide in mixed gas

A carbon dioxide and mixed gas technology, applied in gas treatment, air quality improvement, chemical instruments and methods, etc., can solve the problems of high regeneration energy consumption, easy to be oxidized by oxygen, low decarbonization ability, etc., and achieve low regeneration energy consumption Effect

Active Publication Date: 2018-12-18
DALIAN UNIV OF TECH
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Problems solved by technology

[0015] The purpose of the present invention is to develop an anti-oxidation non-aqueous decarburization solution that captures carbon dioxide in the mixed gas to solve the above problems such as low decarburization capacity of the decarburization solution with water, high regeneration energy consumption and easy oxidation by oxygen, etc., and can Better CO at lower pressure conditions 2 Recovery efficiency

Method used

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  • Anti-oxidative non-aqueous decarbonization solution for trapping carbon dioxide in mixed gas
  • Anti-oxidative non-aqueous decarbonization solution for trapping carbon dioxide in mixed gas
  • Anti-oxidative non-aqueous decarbonization solution for trapping carbon dioxide in mixed gas

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Embodiment 1

[0066] The performance investigation of embodiment one non-aqueous solution being oxidized

Embodiment 11

[0067] Oxidation experiment of embodiment 1.1 absorption process

[0068] First, prepare two 150g non-aqueous solutions of 30wt% EMEA+70wt% DEEA, without adding antioxidants, take samples, and then put them into two 300ml autoclaves respectively and number the two autoclaves as 1 and 2. Secondly, since variables need to be controlled in this experiment, it is necessary to ensure that the two kettles have different gas compositions, that is, the No. 1 kettle is fed with 10% CO 2 , N 2 balance and 13% O 2 , 10% CO into No. 2 kettle 2 , N 2 Equilibrium, other variables such as temperature, pressure, etc. are consistent. Therefore, in this experiment, an oil bath was used to keep the temperature of the two kettles at 70°C, and the gas pressure of the two kettles was 0.7MPa. Finally, under the above conditions, reacted continuously for 16 days, during which samples were taken, and regeneration was carried out to investigate the mass fraction of EMEA.

[0069] figure 1 It is ...

Embodiment 12

[0070] Embodiment 1.2 Solution absorption and desorption performance

[0071] Using CO 2 Absorption and desorption device, investigated the CO of the solution after the two tanks reacted and regenerated 2 Absorption and desorption performance (100g solution), and compared with the blank group. The absorption temperature is 40°C, the desorption temperature is 100°C, and the reaction pressure is normal pressure. The fresh solution is 30wt% EMEA+70wt% DEEA, and its absorption curve and desorption curve are shown in section 3.2 of this paper.

[0072] figure 2 For the absorption process, CO 2 Absorption (β 1 , mol CO 2 / mol EMEA) versus time (t, min). As can be seen from the figure, the three curves in the first 10 minutes basically overlap, indicating that the three solutions CO 2 The absorption rate is almost the same; the curve of the fresh solution still shows a rapid upward trend at 10-20 minutes, the curve of the No. 2 kettle rises rapidly with a certain slope and t...

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Abstract

The invention provides an anti-oxidation non-aqueous decarbonization solution for trapping carbon dioxide in a mixed gas, and belongs to the technical field of carbon dioxide gas trapping. The invention relates to a non-aqueous decarbonization solution, which is composed of a main absorption component N-ethylethanolamine and a solvent N, N-diethylethanolamine. The non-aqueous decarbonization solution has high boiling point, low viscosity and fast absorption rate for carbon dioxide. The absorption capacity is high and the product is easy to regenerate. By adding the antioxidants 2-butanone oxime, pyrogallol, carbohydrazide and N, N'-bis(salicylidene)-1,2-propylenediamine, the main absorption component and the solvent can be effectively prevented from being oxidized by oxygen, thus guaranteeing good performance and service life of the non-aqueous decarbonization solution. The non-aqueous decarbonization solution of the invention is mainly used for trapping carbon dioxide in various chemical reaction tail gases, tail gases from steel plants and cement plants, ore decomposition gas, combustion flue gas, natural gas, city gas and biogas, and has a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and relates to a method for capturing carbon dioxide (CO2) in mixed gas. 2 ) antioxidative non-aqueous decarburization solution and its application. Background technique [0002] At present, countries all over the world are implementing the CO stipulated in the Paris Agreement. 2 Emission reduction tasks are intended to avoid air pollution and the "greenhouse" effect. CO produced by human activities 2 Nearly 1 / 3 of that comes from the burning of fossil fuels. Industrial production industries such as oil refineries, cement plants, ironworks, power plants, lime plants, and magnesia plants are all emitting a large amount of CO 2 . If these industries are not allowed to emit, the development of the national economy will be affected, so by capturing and storing CO 2 ways to reduce atmospheric CO 2 content, is the only way out for these industries. [0003] Existing technologies for sepa...

Claims

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Application Information

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IPC IPC(8): B01D53/62B01D53/78
CPCB01D53/62B01D53/78B01D2257/504Y02A50/20Y02C20/40
Inventor 张永春陈绍云储可弘刘苡瑶
Owner DALIAN UNIV OF TECH
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