Page 168 - CW E-Magazine (8-7-2025)

Special Report

CO Capture tion experiments were conducted. The have been tested. Subsequently, another
2
[This column has covered many papers study focused on the steady-state CO strategy was developed via an in situ
2
on CO capture with new amines, new absorption-desorption performance assembly to immobilize alcalase within
2
strategies for desorption, etc.] of the trisolvent MEA (monoethanol a hydrazone-linked COF platform. Here
amine)-EAE (2-ethylaminoethanol)- non-steroidal drugs like RS-Flurbipro-
n-Butanol (B) regulated DEEA (diethylethanolamine) at fen; nucleotide analogue, RS-tenofovir
phase separation of a specific concentration of 4.5 mol/ were processed in HPLC and has sur-
aminoethylethanolamine liter. Solid base catalysts – CaCO and passed the commercial chiral column.
3
(AEEA) as an effi cient CaMg(CO ) – and solid acid catalysts – This set up was run for over 2,400 runs.
3 2
HND-580 and HND-8 – were studied. (Angew. Chem. Intl. Ed., 2024; DOI:
absorbent of CO
2 There is an indication that there was 10.1002/anie.202420269).
Huang et al have worked on CO phase enhancement in capacity and specifi c
2
change absorbents (CPCAs) and nB was heat reduction compared to non-catalytic A chiral COFs membrane for
used for the title amine. The CPCA of process; optimal comparison of absorbent enantioselective amino acid
AEEA/nB/H O exhibited a 44% higher is given. (Ind. Eng. Chem. Res., 2024; separation
2
cyclic capacity and 25% lower regen- DOI: 10.1021/acs.iecr.4C02759).
eration energy consumption compared Jin et al have incorporated chiral mole-
to simple AEEA-H O. Phase separation Continuous isothermal cules in the COFs with uniformly ordered
2
was good. (Ind. Eng. Chem. Res., 2024; antisolvent crystallization of pores to make chiral COFs, which have
DOI: 10.1021/acs.iecr.4C03451). pyrazinamide (P) in a coiled shown promise for enantioseparation.
fl ow inverter device A homochiral COF nanochannel mem-
Catalytic regeneration of brane has been reported by introducing
amine-based absorbents for Gargi et al have used a helically coiled chiral centers (L-methylalanine methyl
ester) into one of the organic ligands for
CO capture: The effect of tube with alternating 90° bends, which the enantioseparation of chiral amino
2
acidic sites and accessibility ensures enhanced radial mixing, result- acids. This work shows that the D-iso-
ing in plug fl ow behaviour. P in acetone mer is preferentially transported through
Z. Geng et al have worked on the title was crystallized using cyclohexane as the porous membrane channel. This
subject as the energy requirement in the an antisolvent and δ-Polymorphin was composite membrane shows excellent
regeneration is a key economic factor. obtained with no detectable amount selectivity for racemic phenylalanine.
This work uses composite metal oxide of α-Polymorphin. Use of ultrasound (Angew. Chem. Intl. Ed., 2024; DOI:
solid catalysts for 5 M monoethanol- allowed clogging-free operation. (Ind. 10.1002/anie.202417088).
amine (MEA) solution at 90°C. The Eng. Chem. Res., 2024; DOI: 10.1021/
inclusion of SO / ZrTiOx catalyst acs.iecr.4C00630). Bienzymatic-Dynamic Kinetic
2-
4
resulted in a 99% increase in CO de- Resolution (DKR) alcohols by
2
sorption rate, a 43% improvement in Chiral separation esterifi cation/racemisation in
cyclic capacity, and a 29% reduction water
in relative heat duty when compared Highly effi cient chiral
to the blank experiments. (Sepn. Purfn. separation based on alkali- A. Rudzka et al have reported 100%
Technol., 2023, 327, 15 Dec., 124889; proof protein immobilization theoretical yield from racemic substrates
DOI:10.1016/j.seppur.2023.124889). by Covalent Organic by combining the interconversion of sub-
Frameworks (COFs) strate enantiomers with an enantioselec-
Catalytic CO capture tive transformation. These authors have
2
performance of a MEA-EAE- M. Yang et al have referred to the in- reported a DKR of racemic sec-alcohols
DEEA trisolvent in a hot stability of traditional Chiral Stationary using (R)-selective MsACT variants;
silicone oil based pilot plant Phase (CSPs) in alkaline environments. 2,2,2 trifl uoroethyl acetate was the acyl
These authors have developed basophilic donor yielding (R)-acetates with over
Y. Li et al have worked on energy-effi - alcalase in a creative way to fabricate 99% conversion and high-to-excellent
cient combo process and conducted trials ultra-stable protein-based CSPs that optical purity of 83% to 99.9%. (Angew.
in a pilot plant, using various catalytic can efficiently work under alkaline Chem. Intl. Ed., 2024; DOI: 10.1002/
packing. Hot silicone oil based absorp- conditions. Chiral amino acids and drugs anie.202420133).

168 Chemical Weekly July 8, 2025

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