Page 171 - CW E-Magazine (22-10-2024)

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Separation Technology

and 1 bar, which is better than other
solvents. (AIChE Jl, 2024; DOI: 10.1002/
aic.18376).

Dynamics of an absorption/
desorption plant

M. Weber et al have made an experi-
mental study and model validation of
this important system. Both absorption
and desorption happen simultaneously
and strongly interact, resulting in a very
complex process behaviour. For ensuring

Absorption/desorption of CO pyridine (AP) is referred. This strategy
by Deep Eutectic Solvents 2 led to enhancement of the absorption
(DESs) via reversible CO - capacity of AP from 0.1 mole of CO per
2
triggered proton transfer 2 mole of DES to 0.6 mole of CO per mole
2
process of DES at 30°C and 101.3 KPa after stable and safe process operation, even
forming DES with EG. Regeneration in the presence of instabilities or mal-
Y. Wang et al have worked on a new of loaded solution was rapid at 80°C. functions, understanding the dynamic
strategy to improve the absorption capa- (ACS Sustainable Chem. Eng., 2024; behaviour is essential. A pilot plant
city of amino-based functionalised DOI: 10.1021/acssuschemeng.3C06769). experimental study was carried out in
DESs and inhibit increase of viscosity which three different stepwise changes
by changing the proton transfer site from Selective CO separation of the solvent fl ow rate were made. The
2
-NH to –N=O to prevent the formation through physicochemical developed novel dynamic model was
2
of -NH-COO and -NH using aromatic absorption by triazole- validated through the above experimen-
-
3
amines and ethylene glycol (EG); 4-amino- functionalised ionic liquid tal results. (Ind. Eng. Chem. Res., 2024;
binary absorbents (TAFILs) DOI: 10.1021/acs.iecr.3C03262).
X. Sun et al have worked on the selective A novel diamine non-
separation of CO from CH -containing aqueous absorbent-based
2
4
gases via adopting TAFILs, which were on N-methyldiethanolamine
designed by combining low molecular (MDEA) regulation for energy
weight cations with triazole anion con- effi cient CO capture
taining N electronegative site and further 2
mixed with physical solvents to form MDEA with primary/secondary. amines
physico-chemical absorbents. [ChO] in aqueous medium are already widely
[Triz]/TMS (80 wt%/20 wt%) absorbed used for scrubbing CO . Now Z. Wang
2
0.125 gm CO per gm absorbent equal et al have come out with MDEA +
2
to that of 30 wt% MEA solution at 40°C PEG20 + MEA as an absorbent, which is

Chemical Weekly October 22, 2024 171

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