Page 175 - CW E-Magazine (11-2-2025)

Special Report

lower than that in single salt solutions. A
remarkable factor is the ionic coordina-
tion structure in mixed solution, which
leads to inferior selectivity. Molecular
simulations were done. By introducing
anions with coordination ability, the
above detrimental effect is mitigated. (AI-
ChE Jl, 2024; DOI: 10.1002/aic.18505).

Mixed Matrix Membranes
(MMMs) based on
nanoparticles, nanorod, and
nanosheet MF1-type zeolites
for gas separation

Z. Guo et al have referred to the superior
performance of MMMs for gas separa-
tion, e.g., in natural gas. These authors
have made MMMs employing Tröger’s of 35.73 kg per sq.m. hr. for 3.5 wt% CO purity of 95.6% and recovery of 90%
base polymer and zeolites with three dif- NaCl at 70°C in a vacuum MD. [Ind. and CH purity of 92% and about 99%
2
ferent morphologies. Investigation were Eng. Chem. Res., 2024; DOI: 10.1021/ recovery. This was through 4-bed 8-step
4
done for CO /CH and H /CH separation. acs.iecr.4C00350). and 4-bed 7-step cycles. CO capture
2
4
2
4
The title membranes gave improved and CH upgrading used zeolite NaY and
2
performance with respect to gas perme- Coke Oven Gases (COGs) activated carbon RB3, respectively. (Sepn.
4
ability at the cost of some reduction in processing by vacuum swing Purfn. Technol., 2025, 354, Part-1, 128593;
selectivity. (Ind. Eng. Chem. Res., 2024; adsorption (VSA): Carbon DOI: 10.1016/j.seppur.2024.128593).
DOI: 10.1021/acs.iecr.4C01362).
capture and CH recovery
4
“Two birds one stone” [This column has covered the matter ZIF-8 membranes for efficient
strategy: PTFE nanorods for of valorising COGs, which has great C H recovery from the H O
2
2
6
3
assembling nanomaterials potential.] to propylene oxide (PO)
and constructing hydrophobic COGs contain H , CO and CH and J. process
porous membranes for high- Wang et al have reported simultaneous [The epoxidation of C H with H O
2
4
2
3
2
2
6
performance Membrane and efficient recovery of CO and CH using Ti Silicalite as a catalyst has been
an important breakthrough process in
2
4
Distillation(MD) from COG-to-H tail gas. Novel VSA the recent past.]
2
[This column has covered some papers cycles were developed and tested and a
on MD, particularly for zero discharge combination of experiments and simula- The separation of C H /C H was
3
6
3
8
systems after multi-effect evaporators tions was adopted. This strategy allowed re a l i se d vi a a d opt i ng Z IF-8
for retentate from RO systems and use
of MD to cut down energy costs.]
C. Lai et al have reported the promising
title system. These authors have con-
structed a hybridised membrane featuring
lotus leaf mimetic hierarchies by vacuum
filtration of a commercial PTFE nanorod
emulsion containing wrinkled reduced
graphene oxide microspheres on a micro-
filtration substance. This system has
strong hydrophobicity and excellent salt
rejection of 99.75% with high water flux
Chemical Weekly February 11, 2025 175
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