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Simulation and energetic assessment of the ammonia synthesis loop with ionic liquid-Based ammonia recovery from recycle gas
CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
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2022 (English)In: Separation and Purification Technology, ISSN 1383-5866, E-ISSN 1873-3794, Vol. 301, article id 121951Article in journal (Refereed) Published
Abstract [en]

Ammonia (NH3) synthesis by Haber-Bosch process is recognized as the most important pathway for NH3 production. However, NH3 recovery from recycle gas using conventional condensation separation is still an energy-intensive process. Ionic liquids (ILs) have been proved to be effective solvents for NH3 separation and recovery due to their unique properties. In this work, a novel IL-based ammonia synthesis loop (IL-HB) was proposed, taking the protic IL [Bim][NTf2] as the absorbent to separate and recover NH3 from recycle gas, aiming to reduce the energy consumption and increase the NH3 production capacity of the synthesis tower. Then, a systematic methodology that considers reliable thermodynamic models as well as process simulation and assessment was established to evaluate the feasibility of the IL-HB. Furthermore, two entire processes (ILa-HB and ILb-HB) that integrate the optimal sections of IL-based NH3 recovery from recycle gas with the ammonia synthesis loop as a whole were simulated, taking the conventional Haber-Bosch ammonia synthesis loop (HB) as the benchmark. The simulation results prove great techno-economic potentials of the proposed ILa-HB and ILb-HB. Compared with the HB, the energy consumption and CO2 emissions of ILb-HB can be reduced by 16.01% and 29.44%, respectively, presenting enormous energy-saving and environment-friendly superiority.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 301, article id 121951
Keywords [en]
Ionic liquids, Ammonia separation, Absorption, Process simulation, Process assessment
National Category
Chemical Process Engineering Other Environmental Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-92921DOI: 10.1016/j.seppur.2022.121951ISI: 000866461100003Scopus ID: 2-s2.0-85137286556OAI: oai:DiVA.org:ltu-92921DiVA, id: diva2:1696091
Note

Validerad;2022;Nivå 2;2022-09-15 (hanlid);

Funder: National Natural Science Foundation of China (21890760, 21838010, 22122814), Major Scientific and Technological Project of Shanxi Province of China (20201102005), Youth Innovation Promotion Association of the Chinese Academy of Sciences (2018064), Henan Major Science and Technology Project (201300310900)

Available from: 2022-09-15 Created: 2022-09-15 Last updated: 2023-02-28Bibliographically approved

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Ji, Xiaoyan

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