Page 167 - CW E-Magazine (8-7-2025)

Special Report Special Report

distribution. There is a coverage on A fl exible phosphate MOF covered. (Ind. Eng. Chem. Res., 2024; (TFC MMM) that can boost producti-
how these nanocomposite membranes for enhanced cooperative DOI: 10.1021/acs.iecr.4C020272). vity and yet have low cost. TFC MMMs
can be further developed. (Angew. ammonia capture containing Matrimid mixed with 12 wt%
Chem. Intl. Ed., 2024; DOI: 10.1002/ Highly enantioselective ZIF-94 were prepared by kiss coating on a
anie.202418649). D.D.A. Jaysinghe et al (a large number transportation across liquid porous support. CO /N selectivity was 40
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of authors) have worked on a challenging membranes mediated by and CO permeance of 4 GPU. The use of
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Continuous chiral inversion problem in the manufacture of NH by porous Covalent Organic ZIF-94 also helped in stabilizing against
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by coupling enzymatic Haber-Bosch process where NH is con- Frameworks (COFs) membranes undergoing CO plasticisa-
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racemisation with densed so that unconverted N +H can K. Zhang et al have worked on chiral tion. (Ind. Eng. Chem. Res, 2024; DOI:
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enantioselective fl uidised bed be recycled and this is energy intensive membranes, which can help in pharma 10.1021/acs.iecr.4C03086).
crystallisation (FBC) (global NH production is 150-mtpa and and other industries as optically active Spatial and temporal
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is going to increase as NH is also a H
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J. Gansch et al have worked on the carrier and now there are turbines which API is almost mandated and not its visualization of polymorphic
racemic version. These authors have
title problem of considerable industrial burn NH ). A number of adsorbents have demonstrated for the fi rst time that chiral transformations in
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relevance as the problem of unwanted been considered but life with NH is not porous material can act as mobile carri- pharmaceutical tablets
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chiral isomers is a serious one. Thus at all satisfactory and in another context ers of bulk liquid membranes (BLMs) to
coupling enzymatic racemisation with very low NH concentrations are not enhance enantioselective transport and Oswald et al have used X-ray Diffraction
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siloxane) by solution blending. These leading to 3.7- and 2.6-fold enhance- Continuous chiral inversion by adsorbed in a satisfactory way. These separation. 2D Chiral COFs (CCOFs) Computed Tomography (XRD-CT) as
membranes were fully characterised. ment in ideal selectivity for CO /N and coupling racemisation two-stage authors have come out with a new type of were prepared by imine condensations a non-destructing method for molecu-
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The total flux reached 1,515.28 gm CO /CH . (Angew. Chem. Intl. Ed., Preferential Crystallisation adsorbent with pore-expansion strategy of a chiral molecule and have excellent lar-level information with special re-
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per sq.m. per hour and the separation 2024; DOI: 10.1002/anie.2024.19532). utilizing the fl exible phosphonate frame- water, acid and base tolerance, and solution. This was used to analyse tablets
factor reached 8.7 at a 3 wt% COF work, STA-12 (Ni), which has shown have chiral amine groups in 1D porous that have been subjected to a range of
loading. Membranes had satisfactory Confi nement effects and exceptional stability and capture of NH channels. CCOFs with both -F and -iPr
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stability during six months of conti- manipulation strategies of at ppm levels at elevated temperature of groups show superior performance. (This
nuous operation. (Ind. Eng. Chem. nanocomposite membranes 100-220°C and even under humid condi- can be a very useful strategy) (Angew.
Res., 2024; DOI: 10.1021/acs.iecr. towards molecular separation tions. A remarkable uptake of 4.76 mmol Chem. Intl. Ed., 2024; DOI: 10.1002/
4C02886). per gm at 100 µbar (equivalent to 100- anie.202419916).
G. Chen et al have emphasized the im- ppm) is reported. In situ neutron powder
Modifi cation of ZIF-8 portance of material featuring well-de- diffraction, inelastic neutron scattering, Thin fi lm composite
membranes for gas separation fined nanoscale channels, with their and infrared microspectroscopy was mixed-matrix membranes
using X-ray radiation attendant inherent advantages, in mole- adopted to study the mechanism. STA- (MMMs) based on Matrimid
cular separation, catalysis and energy 12 (Ni) can be engineered into pellets and Zeolitic imidazolate X-ray Diffraction CT images for the tablets compressed to
50 MPa and 400 MPa at t = 4 days (Fresh) and t = 30 days
M. Tsapatsis et al have worked on the storage. In this review, emphasis is on or monoliths without losing adsorption (aged). The underscore number designates the tablet number.
title strategy where with 300 min irradia- nanocomposite membranes that leverage capacity, making them useful in practice. frameworks for CO /N The white particles indicate the presence of 2-(2-hydroxyace-
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toxy)acetic acid. The XRPD patterns of the pure
tion time, CO permeance decreased by the confi nement effects between fi ller (J. Am. Chem. Soc., 2024; DOI: 10.1021/ separation performance compression pressures. A pressure-sen-
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only 9% while N and CH permeance and matrix to construct precise nano- acs.4C12430). E. Lasseuguette and M-C. Ferrari have sitive marker, glycolide was used to track
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reduced by 75% and 65%, respectively, channels and regulate the nanochannel Advances in Ionic Liquid (IL) referred to the development of thin-fi lm changes. (Angew. Chem. Intl. Ed., 2024;
technologies for CO capture composite with mixed-matrix membranes DOI: 10.1002/anie.202412976).
and conversion 2
[This column has covered many papers
on absorption of CO where many
2
advances have been reported.]
preferential crystallisation is experi- C. Numpilai et al have given a compre-
mentally demonstrated. Experiments hensive renew of the title subject. ILs are
were then done on pilot plant scale and attracting attention due to their unique
led to successful, effi cient, and robust properties like structural tenability,
continuous chiral inversion with puri- strong CO affi nity and non-volatility.
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ties exceeding 98%. (Ind. Eng. Chem. The transformative role of ILs in con-
Res., 2024; DOI: 10.1021/acs.iecr. verting CO into cyclic carbonates is
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4C01970). discussed. Futuristic aspects are
166 Chemical Weekly July 8, 2025 Chemical Weekly July 8, 2025 167
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