Enhancing low-temperature desorption performance toward energy-saving CO2 capture via the multifunctional design of diethylethanolamine-based biphasic solvents

Huajun Zhao, Jingyi Liu, Shuaiqing Cheng, Rujie Wang, Qiangwei Li, Shanlong An, Shihan Zhang and Lidong Wang

Energy, 2024, vol. 307, issue C

Abstract: Biphasic solvents with primary/secondary amines as the primary absorbent involve a high heat of reaction and low desorption efficiency, limiting their development. A tertiary amine-based biphasic solvent composed of diethylethanolamine (DEEA), 2-Amino-2-methyl-1-propanol (AMP), ethyl acetoacetate (EAA), and H2O (referred to as DEEA/AMP/EAA/H2O) was proposed, which exhibited superior low-temperature desorption performance and ultra-low regeneration energy. EAA was revealed to facilitate the low-temperature desorption by reducing the activation energy from 6.8 to 2.3 kcal/mol. When regenerated only by heating to 353.15 K, the CO2-rich phase showed a significant desorption efficiency of 88.2 %; the desorption capacity and desorption rate were even 2.23 times and 6.84 times higher than 30 wt% MEA at 393.15 K. Moreover, the desorption heat dominated by the deprotonation of tertiary amine was as low as 0.92 GJ/t CO2; and low-temperature regeneration brought extremely low latent heat below 0.062 GJ/t CO2. Thus, the total regeneration energy was as low as 1.16 GJ/t CO2. In addition, EAA could trigger the phase separation and increase the absorption rate constant from 3.87 E−4 to 1.36 E−3 s−1, even higher than 30 wt% MEA. The addition of AMP further increased the CO2 loading (4.34 mol/L) and CO2 distribution (97.43 %) of the CO2-rich phase.

Keywords: Tertiary amine; Biphasic solvents; CO2 absorption; Low temperature desorption; Regeneration energy; Desorption mechanism (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544224023879
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:307:y:2024:i:c:s0360544224023879

DOI: 10.1016/j.energy.2024.132613

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 ().