Super-low energy consuming CO2 capture triggered by weak hydrogen bonds in solid-liquid phase separation

Lidong Wang, Jie Fang, Haojun Ma, Chuhuan Wang, Rujie Wang, Qiangwei Li and Shihan Zhang

Energy, 2023, vol. 272, issue C

Abstract: A novel nonaqueous solid-liquid biphasic solvent, diethylenetriamine (DETA)/dimethyl sulfoxide (DMSO), with considerable CO2 absorption capacity and extremely low regeneration heat, was proposed. After absorbing CO2, the precipitate exhibited a CO2 loading of 0.0070 mol g−1, which accounted for 96.9% of the captured CO2. Benefiting from the greatly reduced reaction heat, sensible heat, and latent heat, the estimated regeneration energy using DETA/DMSO biphasic solvent was reduced to 0.74 GJ t−1 CO2. The corresponding regeneration cost was 44.4 CNY·t−1 CO2, only 19.5% of 5 M MEA, and much lower than the reported biphasic solvents. Moreover, the DETA/DMSO absorbent had good absorption/desorption stability and large desorption efficiency (about 92%). In addition, the substances distribution and CO2 absorption mechanisms of DETA/DMSO were revealed. DETA-carbamate and protonated DETA were recognized as the major CO2 absorption products, while a small amount of carbamic acid rearranging from zwitterion could also exist stably in DMSO diluent. Because of the huge polarity difference of these species in CO2-loaded absorbent, high polarity DETA-CO2 products aggregated together due to weak hydrogen bonds and precipitated from the liquid phase. Overall, the DETA/DMSO biphasic solvent was proved to be a potential candidate for conventional MEA in sustainable CO2 capture.

Keywords: CO2 capture; Nonaqueous absorbent; Biphasic solvent; Solid-liquid phase transition; Regeneration energy (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S036054422300556X
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:272:y:2023:i:c:s036054422300556x

DOI: 10.1016/j.energy.2023.127162

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().