Page 175 - CW E-Magazine (10-12-2024)

Special Report

A rapid wrap-up of what’s new in Operations,

Processes and Products

Separation Technology

PEG dimethyl ether solution, which is
homogeneous for the title process. This
solution turns into two immiscible liquid
phase upon the absorption of H S thus
2
facilitating the process. The loading can
reach 0.16 gm per gm solvent under a
H S partial pressure of 10 kPa at 20°C.
2
More than 94% of H S is concentrated
2
in the lower phase, which is regenerated
at 90°C with an energy consumption of
1.69 GJ per tonne H S. In this process
2
the regeneration energy is 58% lower
than of 30 wt% MDEA. The selectivity
is high when the gas contains CO . (Ind.
2
Eng. Chem. Res., 2024; DOI: 10.1021/
acs.iecr.4C00537).

One-step butadiene (BD) other C-4 olefi ns and alkanes (cis- and CO removal; regeneration of
purifi cation in a sulphonate- trans-2-butene, isobutylene, n- and absorbent
2
functionalised MOF through isobutane). Regeneration can be easily [The subject of CO removal continues to
synergistic separation done near ambient conditions. (Angew. attract lot of attention particularly with
2
mechanism Chem. Intl. Ed., 2024; DOI: 10.1002/ respect to reducing energy consumption
anie.202403345).
in regeneration of the absorbent and this
J. Cui et al have come out with a column has covered many papers where
potentially useful way of recovering BD Highly effi cient nonaqueous new strategies are covered.]
from C-4 fraction of naphtha crackers phase change absorbent for
where as of now extractive distillation is H S absorption with low M. Lin et al have reported energy
2
practiced. These authors report polymer energy consumption effi cient carbon capture through electro-
grade BD (99.5%) through this new chemical pH swing regeneration of
strategy. ZU-609 was functionalised, J. Liu et al have developed 1,5-di- amine solution. This study has intro-
which selectively recognises BD from azabicyclo[4.3.0] non-5-ene (DBN)/ duced an innovative anion exchange
membrane (AEM)-based electrochemi-
cal process for solvent regeneration.
Amines were selected with pKa between
7 &10, which helps in maintaining
bicarbonate as the predominant carbon
species and thus higher than 80% current
yield is realised. This strategy results in
a minimum energy requirement of 63
KJ per mol at a current density of 20 A
per sq.m. to regenerate MDEA, and CO
2
purity exceeds 99%. (ACS Sus. Chem.
Eng., 2024; DOI: 10.1021/acssusche-
meng.3C08430).

Chemical Weekly December 10, 2024 175

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