Page 175 - CW E-Magazine (22-10-2024)

Special Report Special Report

Membranes based separa- Enhancing Mg / Li problem is in designing materials that pellets had excellent mechanical strength purity exceeding 99.95% is reported; azobenzene-tetracarboxylate), which
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tion separation performance of are easily processable for membrane and stability for industrial applications. n-butane purity was in excess of 99%. have strong coordination bonds into the
NFMs through polyelectrolyte production and giving high performance Highly selective separation of ethylene (Angew. Chem. Intl. Ed., 2024, April; PEBAX-1657 polymer matrix. Here the
Surface modifi cation of modulation and surface under the demanding conditions of in- with moderate-high adsorption capacity DOI: 10.1002/anie.2023.19674).
nanofi ltration membrane modifi cation dustrial operations. These authors have of 2.23 m mol per gm at 25°C and 1 bar is
reported. High purity ethylene, 99.9%+, Reaction-Extractive
synthesized polytriazole membrane
(NFM) using quaternary with chemically stable hydrophilic and is reported. (Ind. Eng. Chem. Res., 2024; Distillation (RED)
diethanolamine (QTDEA) J. Wang et al have referred to the title hydrophobic segments. Thus, asphaltene DOI: 10.1021/acs.iecr.4C00160).
for effi cient antibiotics/salt separation, which is crucial in process- was removed and up to 50% of sulphur I.A.X. The et al have studied the im-
separation ing Li-based ores. These authors have compounds were eliminated. (J. Mem- Induction vacuum swing pact of side reaction of ethylene oxide selectivity was 94% for CO /N ; CO
used dimethyldiallylammoniumchloride brane Sci., 2024, 701, May, 122716; adsorption (IVSA) over (EO) hydration on the triple column adsorption capacity was 64.77 cc per
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2
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X. Guo et al have synthesized novel (DMDAAC)-modifi ed polyethersulfone DOI: 10.1016/j.memsci.2024. 122716). magnetic sorbent monoliths RED. These authors have examined the gm. (Ind. Eng. Chem. Res., 2024; DOI:
Gemini-type monomer QTDEA and surface for interfacial polymerization and extrudates for ethylene/ effect of these side reactions on energy 10.1021/acs.iecr.4C00458).
used for the surface modifi cation and modulation for preparing the title NFMs. Reliable and effi cient ethane separation consumption, total annual cost (TAC)
grafting was realised by the esterifi - This membrane gave high MgCl rejec- membrane processes for clean and CO emission. The presence of Membrane Distillation (MD)
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cation of – OH in QTDEA with acyl tion. Further modifi cation was done with and sustainable production of K. Baamran et al have referred to the higher boiling point of higher glycol [This column has covered papers on
chloride. This modifi cation results in piperazine. This modified membrane emerging area of electrifi cation of ad- product derivatives affects the chemical this subject due to its emergent utility
gave MgCl rejection of 94.7%. The fresh water from saline waste
improving both water permeability and 2 sorption processes. These authors have equilibrium data and results in higher particularly for retentates from seawa-
antibiotics/salt selectivity. The water separation factor was an impressive worked on two adsorbents, namely capital costs. ter/brackish water desalination units to
permeance was 18.2 liters per sq.m. 77.2. (J. Membrane Sci., 2024, 701, R. Ouchn et al have referred to sea- Fe O /ZIF-7 (ethane selective) and save energy for MEE for zero discharge.]
water desalination as a crucial answer for
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per hour per bar and chlorotetracycline May, 122725; DOI: 10.1016/j.mems- making quality water and with direct Fe O /13X (ethylene selective) and The case of THF/ethanol/water and ethyl
hydrochloride (CTC) desalination ci.2024.122725). contact membrane distillation (DCMD) have made extrudates and monoliths and acetate/ethanol/water are also reported.
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from a NaCl solution of 10 gm per emerging as a promising technology. tested them under different regeneration (J. Chem. Technol. Biotechnol., 2024;
litre. Here the selectivity was 21.2. Antibacterial polyamide Extensive experimental investigations are scenarios like simultaneous and sub- DOI: 10.1002/jctb.7658).
(J. Membrane. Sci., 2024,701, May, NFMs with intermediate reported. DCMD is clearly a promising sequent induction evacuation, induction
122740; DOI: 10.1016/j.memsci.2024. layer of quaternized cellulose technology. PVDF membranes modifi ed only and evacuation only. Excellent E. Sanchez-Ramirez et al have discussed
+
2+
122740). nanocrystals for Mg /Li regeneration capabilities are reported. a more appropriate way to optimise the
separation with IL MPF6 and TBAFP6 is promising Ethylene purity of 99.4%, recovery of hybrid RED system. Optimisation vari-
Scalable preparation of ultra- [Mg /Li separation continues to attract and has shown 300% improvement com- 99.6% and productivity of 39.9 moles ables are discussed. These authors have
+
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pared to the support alone. A diffusion
selective and highly permeable a lot of attention as the processing of mechanism for vapour molecules is per kg per hr are reported. This strategy also discussed hydration of EO. Their
fully aromatic polyamide ores entails this problem and this column indicated. (J. Chem. Technol. Biotechnol., has a potential. (AIChE Jl, 2024, April; strategy is discussed at length in the A. Ali et al have covered progress in
NFMs for antibiotic has covered some papers.] 2024; DOI: 10.1002/jctb. 7651). DOI: 10.1002/aic.18401). paper. (J. Sepn. Purfn. Technol., 2024, module design for MD and progress in
desalination 30 Sep., 127184; DOI: 10.1016/j.sep. hollow fi bre and fl at sheet modules are
th
J-M. Jin et al have prepared the title Adsorptive Separation Ideal cage-like pores for pur.2024.127184). reviewed. Further key areas for future
H. Liu et al have worked on the control dual-electric NFMs. This type of molecular sieving of butane research are highlighted. A reference
of structure, i.e., pore architecture and membrane gives high water fl ux of 51 isomers with high purity and Constructing molecular sieve is made for assessment of economic
free-volume elements, to make NFMs litres per sq.m. per hour per bar and Shaping of silver (Ag)- record productivity channels in mixed matrix viability from several pilot-scale
give stability and lend themselves for rejection for MgCl is at 86%. Further, functionalised MOFs for membranes (MMM) for studies. Diverse modules have been
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scalability. These authors have used the separation factor was 29. This effi cient separation of ethylene The separation of n-butane and isobutane effi cient CO separation prepared. (Desalination, 2024, 581,
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4,4’,4’’,4’’-methanetetrayltetrakis(ben- membrane, in addition, has antibacte- over ethane is of considerable industrial importance [The absorption/removal of CO con- 20 July, 117584; DOI: 10.1016/j.de-
zene-1,2-diamine) (MTLB) as a mole- rial properties. (Desalination, 2024, [This column has covered many papers and is usually carried out by distillation tinues to attract a lot of attention due sal.2024.117584).
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cular building block for fabricating thin- 582, 5 August, 117605; DOI:10.1016/j. on this separation via adsorption as the which is capital and energy intensive. to climate change and this column has
fi lm composite membranes (TFCMs) desal.2024.117605). standard process is capital and energy M. Wu et al have reported one-step sepa- covered new strategies in absorption/ M. Malaguti et al have discussed pro-
via interfacial polymerisation. These intensive under cryogenic conditions.] ration process for isobutane exclusion desorption of CO in new amines, ab- ductivity, selectivity, and energy con-
membranes are thin and defect-free, Sour to sweet crude oil with adsorbents with high n-butane capacity. sorption of CO , and membrane-based sumption of pilot-scale vacuum assisted
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with ideal microporosity. The test sys- membranes Z. Li et al have successfully prepared A cage-like MOF (SIFSIX-Cu-TPA) separation.] 2 air-gap MD for the desalination of high
tem was NaCl/adiramycin and selecti- a Ag-functionalised MOF pellet adsor- with small windows and large cavities is salinity streams. The effect of operating
vity was 422. Spiral wound membranes S. Chisca et al have referred to the bent (not in powder form, which gives reported, which allows smaller n-butane L. Wu et al have made use of robust conditions namely, applied vacuum, feed
were made via scale-up, which were important process of sulphur removal high pressure drop) using renewable to enter pores and that too in a large three-dimension pore structures based fl ow rate and feed stream salinity was
stable. (Angew. Chem. Intl. Ed., 2024; from crude oil from economic, energetic carboxymethylcellulose (CMC) as amount. A record high productivity of MOFs as fillers in MMM, Yttrium studied. Higher applied vacuum is use-
DOI: 10.1002/anie.2024.02509). and environmental reasons. The key the binder. MIL-101-SO .Ag@CMC isobutane at 3.2 moles per kg with high based-MOFY-abtc (abtc = 3,3’,5,5’– ful. Economics of a stream of a salinity
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174 Chemical Weekly October 22, 2024 Chemical Weekly October 22, 2024 175

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