Treatment of CO2+NH3 Mixed Waste Gas from Different Sources by Blend Solvents

Volume: 10 | Issue: 02 | Year 2024 | Subscription
International Journal of Chemical Separation Technology
Received Date: 10/04/2024
Acceptance Date: 10/31/2024
Published On: 2024-12-03
First Page: 1
Last Page: 19

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By: Kwang -Guk Kim, Chol -Ryong Choe, Tang -Hyon Yun, and Kwang -Myong Rim.

Professor, Institute of Chemical Engineering, Kim Chaek University of Technology, Pyongyang, DPR, Korea

Abstract

The waste gas from chemical plants, including urea fertilizer plant, contains a large amount of CO2 gas in addition to NH3 gas. New solvents have been studied for use in the absorption of waste gases, but most of them are carried out at specific compositions and flow rates for individual gases. In this paper, a complete conceptual design of the process for separately absorbing CO2 and NH3 gases in a waste gas feedstock stream with a broad range of CO2 contents and flow rates is presented. To absorb this waste gas, a mixed absorbent solvent consisting of 1-butyl imidazolium bis(trifluoromethylsulfonyl)imide ([Bim][NTf2]) and monoethanolamine (MEA) was used. The thermodynamic model and kinetic model of the new MEA-H2O-CO2-NH3-ionic liquid (IL) system were constructed and rigorously modeled and simulated for different sources and compared with the conventional H2O-based process. Simulation results showed that the use of mixed solvents compared to conventional processes resulted in less total regeneration energy under all conditions regardless of CO2 content and flow rate and the effect of IL concentration on energy consumption and total regeneration energy with pressure in stripping column were analyzed, with 30% ionic liquid concentration and 180 kPa CO2 stripping pressure and 240 kPa NH3 stripping pressure. In addition, the total regeneration energy was analyzed after the process improvement to optimize the energy consumption of the process, which saved 2.9% of the energy at 40% CO2 content. The [Bim] [NTf2] + MEA+H2O blend solvent proposed in this paper is a green mixed solvent that is very effective for the absorption of CO2 and NH3 mixed gases, which can be widely used not only for fertilizer plant waste gas treatment but also for other industries.

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Citation:

How to cite this article: Kwang -Guk Kim, Chol -Ryong Choe, Tang -Hyon Yun, and Kwang -Myong Rim Treatment of CO2+NH3 Mixed Waste Gas from Different Sources by Blend Solvents. International Journal of Chemical Separation Technology. 2024; 10(02): 1-19p.

How to cite this URL: Kwang -Guk Kim, Chol -Ryong Choe, Tang -Hyon Yun, and Kwang -Myong Rim, Treatment of CO2+NH3 Mixed Waste Gas from Different Sources by Blend Solvents. International Journal of Chemical Separation Technology. 2024; 10(02): 1-19p. Available from:https://journalspub.com/publication/ijcst/article=14736

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