Page 174 - CW E-Magazine (11-2-2025)

Special Report

DO is made from ethylene glycol and
formaldehyde. There is a problem
associated with DO-water azeotrope
and hence RD + VP (NaA zeolite mem-
brane) can solve the problem. DO is a
multi-functional solvent and is used as a
copolymerisation agent. It can substitute
for toluene and xylene in paint industry.
(Sepn. Purfn.Technol., 2025, 353, Part
A, 19 Jan, 128274; DOI:10.1016/j.-
seppur.2024.128274).
Pyridazine (P)-promoted
construction of vinylene-
linked Covalent Organic
Framework (COF) with
exceptional capabilities of
stepwise water harvesting
[This column has covered some papers Recovery of lactose (L) from Simultaneous manipulation
on water harvesting from air, which is a
becoming important in arid areas.] acid whey by nanofiltration (NF) of membrane enthalpy and
entropy barriers towards
K. Mou et al have successfully deve- M. Roselli et al have worked on the superior ion separation
loped two COFs using 2-connected title subject with respect to recovery of [This column has covered papers on
3,6-dimethylpyridazine. These have valuable product. These authors have charged membranes, which allow sepa-
micro-/nano-scale pore sizes and high demonstrated simultaneous demine- ration of monovalent ions from divalent
surface area. Water uptake was 0.26 gm per ralisation and deacidification of L. ions. In recent past, this has become
gm at 25°C in a rapid way. Cycling tests Further, better removal of lactic acid relevant for Li /Mg separation.]
+
2+
showed outstanding hydrolytic stablility and electrolytes is obtained operating
and durability. (Angew. Chem. Intl. Ed., at low fluxes. Thus an integration of W. Wang et al have worked in this area
2024; DOI: 10.1002/anie.202402446). NF and diafiltration (DF) allows L of to improve the existing levels of sepa-
93.6% purity. (Sepn. Purfn. Technol., ration. These authors believe that the
Separation of an azeotropic 2024; DOI: 10.1016/j.seppur.2024. current theory fails to inspire rapid ad-
mixture through the use of 128303). vances in the separation of monovalent
organic solvent nanofiltration Separation of liquid xylene ions from divalent ions. These authors
(OSNF) have applied the transition state theory
isomers using thin-film by regulating the enthalpy barrier (ΔH)
M. Cook, L.G. Peeva and A.G. Living- composite carbon molecular and entropy barrier (ΔS) by designing
ston (who has made many important sieve (CMS) hollow fibre next-generation monovalent cation
contributions in OSNF and other mem- membranes exchange membranes with great im-
brane-based separations) have come provement in ion-selective separation.
out with a potentially useful strategy of M-J. Jang et al have referred to CMS (Angew. Chem. Intl. Ed., 2024; DOI:
separating azeotropic mixtures. With an having distinct pore structure consisting 10.1002/anie.202408963).
example of toluene/butanol (later tolu- of micropores and ultramicropores as a
ene/ethanol and even toluene/heptane), potential membrane. This was used with Modulating ion coordination
which is basically a mixture of nonpolar a polymer precursor to make a suitable environment for improved
and polar molecules, experimental data membrane (as hollow fibre) to separate Li /Mg selectivity in mixed
+
2+
were collected at various testing condi- xylene isomers. Here, o-xylene can solutions
tions to validate simulation results based be easily separated with this modified
on theory. (Sepn. Purfn. Technol., 2024; membrane. (Ind. Eng. Chem. Res.; DOI: Y. Shi et al have emphasised that the
DOI:10.1016/j.seppur.2024.128480). 10.1021/acs.iecr.4C01539). selectivity in mixed solutions is often

174 Chemical Weekly February 11, 2025

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