Thermodynamic modeling and energy analysis of a polyamine-based water-lean solvent for CO2 capture

Wonho Jung, Myungsuk Lee, Gyeong S. Hwang, Eunseok Kim, Kwang Soon Lee

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Amine-based water-lean solvents are considered to be promising energy-saving alternatives to existing aqueous amine solvents for CO2 capture. Herein, we propose water-lean solvents comprising 3,3′-iminobis(N,N-dimethylpropylamine) (60 wt%), water (10–18 wt%), and a non-amine chemical (balance), probe the solubility of CO2 therein, and perform the energy demand analysis using an Aspen Plus®-based simulator. For CO2 solubility modeling, the e-NRTL model and Redlich-Kwong state equation were incorporated with the equilibrium reaction model proposed by previous researchers, and the Henry's law constant of CO2 was estimated using molecular dynamics simulation as it is difficult to measure experimentally. Experimental data acquired using an equilibrium cell and 13C/1H NMR were used to regress the equilibrium reaction model. The minimum thermal energy demand under desorber pressures of 303 and 505 kPa was calculated to be as low as 1.99 and 1.95 GJ t-CO2−1, respectively, which supports the suitability of the developed WLSs for post-combustion CO2 capture.

Original languageEnglish
Article number125714
JournalChemical Engineering Journal
Volume399
DOIs
StatePublished - 1 Nov 2020

Bibliographical note

Funding Information:
This work was supported by the “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20174010201150) and the Korea CCS R&D Center (Korea CCS 2020 Project) funded by the Korean government (Ministry of Science, ICT & Future Planning) in 2017 (KCRC-2014M1A8A1049261).

Funding Information:
This work was supported by the “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20174010201150 ) and the Korea CCS R&D Center (Korea CCS 2020 Project) funded by the Korean government ( Ministry of Science, ICT & Future Planning ) in 2017 ( KCRC - 2014M1A8A1049261 ).

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

  • CO capture
  • Energy evaluation
  • Thermodynamic model
  • Water-lean solvent

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