Journal
ENERGY
Volume 211, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2020.118667
Keywords
Biphasic solvent; Phase splitter; Regeneration heat consumption; Phase separation; CO2 capture
Categories
Funding
- National Natural Science Foundation of China [21805084, 21706061]
- Natural Science Foundation of Hebei Province [B2018502046]
- Fundamental Research Funds for the Central Universities [2019MS110, 2019MS101, 2017MS137]
Ask authors/readers for more resources
Because of phase separation characteristics, biphasic solvents are recognized as promising absorbents for CO2 capture with low regeneration heat consumption. However, limited CO2 loading in CO2-rich phase, associated with excessive CO2-rich phase volume, challenges the energy-saving regeneration potential of mixed-amine biphasic solvents. In this study, sulfolane was employed as a phase splitter to improve the phase separation properties of N,N-diethylenetriamine (DETA)-N,N,N',N'',N''-pentamethyldiethylenetriamine (PMDETA) biphasic absorbent. By introducing the hydrophobic sulfolane, large CO2 capacity (increased from 3.56 to 6.48 mol/L) and low CO2-rich phase volume (decreased from 100% to 27.1%) were simultaneously achieved. Moreover, sulfolane acted as an absorption accelerator to increase the CO2 absorption rate in DETA-PMDETA-sulfolane solvent to 1.3 times the corresponding DETA-PMDETA sol-vent. Benefiting from the large CO2 capacity associated with favorable phase separation behavior, DETAPMDETA-sulfolane has a minimized regeneration heat estimated at 1.86 GJ/t-CO2 at a lean CO2-loading of 0.55 mol/mol. This is 53.4% lower than the regeneration heat (3.99 GJ/t-CO2) using 5 M monoethanolamine solvent. (C) 2020 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available