Page 157 - CW E-Magazine (23-4-2024)

Special Report

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

Processes and Products

Separation Technology

The role of ion-membrane inte-
ractions in fast and selective
mono/multivalent ion separa-
tion with hierarchical nano-
channels

J. Zhang et al have worked on multi-
stacked polyelectrolytic based cation
exchange system to separate, e.g., K
+
from Mg with a selectivity of up to
2+
13 and permeation of 2.9 mol m h for
−1
−2
K and 0.22 mol m h for Mg . This is
+
−2
−1
2
higher than that realised from the state-
of-the art membranes.
Molecular dynamic calculation were
done and it turns out that the ionic frac-
tionation was due to a large disparity
Capture and catalytic reduction of SO and its catalytic reduction. This in the energy barrier between mono/
2
of SO with H to elemental could capture 2000-ppm of SO and 2.0 multivalent cations. (AIChE Jl., 2023;
2
2
2
sulphur by novel guanidini- moles of SO per mole of DES could be DOI: 10.1002/aic.18232).
2
um-based Deep Eutectic Sol- realised at 20°C. The yield of elemental
vents (DESs) S could reach up to 37% at 100°C. (Ind. Fabrication and application of
Eng. Chem. Res., 2023; DOI: 10.1021/ chiral separation membranes
Y. Wang et al have used a series of novel acs.iecr.3C02086).
functionalised DESs using 1,1,3,3-te- W. Chen et al have worked on the title
tramethyl guanidinium tetrazolate Evaluating diethanolammo- subject and have reviewed the literature
([TMG][TETE]) as a hydrogen-bond nium chloride ([DEA]Cl) as for this important subject, particularly in
accepter (HBA) and azole derivatives liquid solvent for gas separation pharma industry where optically active
as hydrogen-bond doners (HBDs), component is only approved by the US
which were synthesised, for the capture J. Zhang et al have used ([DEA)Cl) as a
potential ionic liquid (IL), which is from
a low cost starting material, for gas sepa-
ration. There are three functional sites
within IL: acidic-NH , hydrogen-bond
+
2
-OH, and nucleophilic Cl . This was
-
used for the separation of NH /N /H ,
2
3
2
SO /CO /N , and H S/CO /CH and
2
2
2
2
4
2
was found to be excellent to separate
NH /N /H and also has proper capacity.
2
3
2
The separation of SO /CO /N was also
2
2
2
proper with respect to SO . (AIChE Jl.,
2
2023; DOI: 10.1002/aic.18231).
Chemical Weekly April 23, 2024 157
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