Page 161 - CW E-Magazine (13-5-2025)

Special Report Special Report

by-layer assembly of polyelectrolytes tertiary mixture produced 0.33 mmol per
should be further developed to realise gm of pure p-NT and the eluent in the
commercial application due to their high desorption stage contained a high content
separation effi ciency, high packing den- of m-NT. Kinetic factors also favoured
sity, acid/alkaline/chlorine resistance, and the above behaviour. (Sepn. Purfn. Tech-
good antifouling capacity. (Sepn. Purfn. nol., 2025, 354, Part-4, 19 Feb., 129062;
Technol., 2025, 354, 19 Feb., 129169; DOI:10.1016/j.seppur.2024.129062).
DOI: 10.1016/j.seppur.2024.1129169).
Highly effi cient chiral
Covalent organic framework extraction of amino acid
membranes achieving Mg/ enantiomers using Wei-Phos-
Li separation by permeating Pd as chiral extraction
Mg while retaining Li + [Separation of racemic mixtures is of
2+
[The rush for producing Li salts for bat- great commercial importance and many
methods are reported including that
teries has resulted in different ores to be based on crystallisation.]
treated, besides brines, and these entail
Mg /Li+ separation. This column has X. Liu et al have reported the title method 2025, 354, Part-6, 19 Feb., 129297; L-M. Ranger et al have referred to the
2+
covered some papers on this; separa- as a new strategy where Wei-Phos is an DOI:10.1016/j.seppur.2024.129297). effi cacy of DWC compared to two con-
tion of charged membranes are covered adaptive chiral sulfi namide phosphine ventional columns in series. However,
where divalent Mg is retained.] ligand used for extraction. This method Research advances in there is a higher risk of malfunction.
2+
is favoured due to its minimal equipment Phosphogypsum (PG) fl otation These authors refer to the simulation
M. Liu et al have come out with a requirements, convenient operation, and purifi cation study analysis with respect to malopera-
different and somewhat novel strategy exchange membranes containing fl exible be converted into a single DWC, which easy scalability. This work shows that tion. The emphasis is on the operation of
where Mg passes and Li is retained. alkyl piperidine side chains. The planar also saves energy and capex. A detailed Wei-Phos-Pd is a highly effi cient chiral W. Jia et al have worked on the title prob- the prefractionator section that is, on the
+
2+
The adjustment of membrane hydro- conjugated non-rotative C structure account is given in the paper. (Hydro- lem as most phosphoric acid is produced choice on liquid and vapor splits, which
ensures the long-term battery cycling. carbon Processing, 2024, August). extractant for amino acid enantiomers. by acidulation of phosphate rock with is crucial for overall performance. These
These authors have demonstrated the The separation factors for phenyl alanine sulphuric acid when PG is produced. The authors have succeeded in identifying
capacity of the prepared membranes Effi cient adsorptive separation (Phe), homophenylalanine (HPh), 3-chloro- quality of this PG is found wanting for 15 non-optimal operating regions for the
for full charge/discharge at 200 mA of nitrotoluene isomers (NTI) phenylglycine (3-Cl-Phg), and 4-nitro- many applications. The world has accu- prefractionator with specifi c internal fl ow
per sq. cm and retained 82% of energy via a stable and low-cost Metal phenylalanine (4-NO -Phe) are 12.19, mulated 6-billion tonnes with an annual patterns, characteristic temperature and
2
effi ciency after 10,000 cycles of 60 mA Organic Framework (MOF) 8.89, 13.17 and 7.06, respectively. Mecha- increase of 150-mt, by 2025-2045. China composition profi les for a common system
per sq. cm. This work supports Neutral with descending affi nity of nism is explained. (Sepn. Purfn. Tech- has a stockpile of 500-mt with addition of BTX. This study enables to identify and
Aqueous Organic Redox Flow Battery meta-/ortho-/para-isomers nol., 2025, 354, Part-5, 19 Feb., 129187; of 70-80 mtpa, and utilisation rate is only hopefully rectify wrong choices for liquid
(NAORFB) (J. Membrane Sci., 2024, [Nitration of toluene is practiced on DOI:10.1016/j.seppur.2024.129187). 46%. The utilisation of PG as a secondary and vapour splits in DWC. (Sepn. Purfn.
philicity infl uences the Mg/Li selectivity 712, Nov., 123165; DOI:10.1016/j. a large scale and results in predomi- Control of Extraction source is affected due to its low whiteness, Technol., 2025, Part-6, 19th Feb., 129151;
and enhanced membrane hydrophilicity memsci.2024.123165). nantly o/p mixture with some m-isomer complex composition, and high impurity DOI:10.1016/j.seppur.2024.129151).
promotes Li retention, rather than Mg . and their separation is usually done by Distillation Processes (EDPs) level which include mineral, organic,
2+
+
This strategy allows facilitation of further Purifi cation of benzoic acid a combination of crystallisation and with preconcentration for and ionic impurities. These authors have CO removal
2
Li extraction. Non-equilibrium mole- (BA) using Dividing Wall distillation.] the separation of ternary discussed the current status and prospect [This topic has been widely covered in
+
cular dynamic simulations were done. Columns (DWCs) azeotropic mixture of ethyl of the fl otation process to get purer G. this column, but continues to attract a
(J. Membrane Sci., 2024, 712, Dec., 123247; Y. Zhang et al have come out with a new acetate (EtAc) – ethanol (E) – The fl otation reagents are also discussed. lot of attention with respect to faster
DOI:10.1016/j.mem.sci.2024.123247). Q. Yang et al of Sulzer have reported a strategy which uses MIL-160 resulting water in the face of multiple (Sepn. Purfn. Technol., 2025, 354, Part-6, removal and regeneration at lower
case study of purifi cation of BA whose in descending affi nity order of m->o- feed disturbances 19 Feb., 129244; DOI:10.1016/j.sep- energy consumption.]
Advanced rigid carbazole (C) current global production is close to >p- NT (MIL-160 is Al-based MOF). pur.2024.129244).
based membranes assembled 1-mtpa. BA is obtained via oxidation of The appropriate pore size and pore envi- T. Wu et al have discussed robust control Intensifi ed CO capture in
2
with fl exible piperidine alkyl toluene with O . The authors company ronment allowed MIL-160 to give a rare systems in the title system. These authors What can go wrong in a structured microreactors with
2
chains for neutral aqueous suggested the combination, distillation m-NT preference and always maintain the have investigated different propor- Dividing Wall Column (DWC) carbonic anhydrase enzyme
organic redox fl ow battery and crystallisation to get high purity m->o->p- NT adsorption order. Dynamic tion-integration (PI) control structures in and how to detect it. (CAE) immobilised on open
BA. Lights and heavies are removed breakthrough and pulse-mode as well the four column ED with preconcentra- [This column has covered many papers cell foam.
S. Peng et al have adopted a systematic in the existing columns of the recipient as batch-mode experiments were done. tion process. Multiple feed disturbances on DWC which saves capex as well as [This column has previously brought out
approach to prepare rigid C-based anion company. The existing columns could Theoretical calculations were done. The are considered. (Sepn. Purfn. Technol., energy consumption.] the virtues of using CAE, which is also

160 Chemical Weekly May 13, 2025 Chemical Weekly May 13, 2025 161

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