Page 155 - CW E-Magazine (10-6-2025)

Special Report Special Report

An electro-metathesis membrane crystalline powder form. Air processing $109 profit. (Chem. Eng. Sci., 2025, waste into high-value platform chemi- CO . Further, using electrifi ed industrial
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reactor for directly producing bulk forms of PE waste leads to stable 30, 15 March, 121356; DOI: 10.1015/j. cals fi rstly, that bisphenol A (BAA) and heat sources and heat pumps to reduce
LiOH with purity exceeding carbon char that does not readily decom- ces.2025.121356). 4,4-methylenebis (N,N-diglycidylani- heating energy will further reduce the
99.5% pose during high temperature process- line) (AGSO). It is interesting to get BPA cost and CO emission. Here CaCO
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ing. Solid additives in the form of salts Gypsum [G] as a feedstock for yield of 93% wt with a purity of 90%, and NaOH reacted to give Ca(OH) and
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X. Liu et al have worked on making are combined with the PE melt. Solid low-cost decarbonized Portland and the yield of AGSO at 96% wt with Na CO . (Green Chem., 2025; DOI:
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battery grade LiOH from Li salts. Tradi- salt additives are then removed from the cement (C) and sulphuric acid an epoxy value of 0.45. (Angew. Chem. 10.1039/D4GC 05568C).
tional causticization methods, which char and converted to a highly crystalline tures: non-polar and polar, using three (SA) Intl. Ed., 2025; DOI:10.1002/anie.2024
involve metathesis reactions between bulk graphite powder using an Fe-based stationary phases with diff erent surface [C-SA process was practiced a long time 22477). Diphenylamine (DPA) active
Li salts like Li CO , Li SO , or LiCl catalytic process. Properties of graphite properties (C18, diphenyl and perfl u- ago and not well known ICI, Billingham, unit contained polytriphenyl-
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and bases such as Ca(OH) , NaOH, or are reported in the paper for Li-ion orinated phenyl). Their work shows UK, which was above an anhydride Novel sustainable synthesis of amine (PTPA) derivative and
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Ba(OH) result in low concentrations batteries. (ACS Sustainable Resource that ethanol and DMC can eff ectively (CaSO ) mine used to practice this a formaldehyde-free thermo- its preparation and electro-
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of LiOH and signifi cant Li loss dragged Management, 2024, DOI:10.2021) replace traditional solvents, without process.] setting phenolic resin through chemical properties as organic
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by CaCO /Na SO /BaSO as solid waste. (ACSSUSRESMGT, 4C00398). compromising separation performance. solvent-free reactive extrusion cathode of Li-ion batteries
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These authors have developed a novel (Green Chem., 2025; DOI: 10.1039/ S.J. Faucher et al have made out a
electro-metathesis membrane reactor, Methanesulfonic acid (MSA) as D4GC0537F). case for the title process. C production A. Maokhamphiou et al have recom- L. Xu et al have reported a novel PTPA
which enhances the causticization pro- a green acid for global depro- Techno-economic assessment of accounts for 8% of CO emission globally. mended replacement of HCHO with derivative contained DPA active unit,
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cess by regulating ion migration through tection in solid-phase peptide Here S is not used, which is byproduct non-toxic terephthaldehyde and phenol which is cathode displayed multi-elec-
ion exchange membrane and blocking synthesis (SPPS) the industrial-scale production has been replaced by resorcinol. The tron redox characteristic with high
impurity ions stage by stage, improving of epoxidized Kraft Lignin (KL) resin is made without a solvent at tem- discharge specifi c capacity and cycling
Li recovery to 84.4% and giving purity F. Albericio et al have referred to the for adhesives or coatings peratures between 150°C and 170°C. stability even at higher current density
of 99.6% of LiOH. The process cost is wide use of DMF and trifl uoroacetic
US$3.32/kg LiOH. (AIChE Jl., 2024; acid (TFA) as the two solvents/reagents S. Forssell et al have reported KL solu-
DOI: 10.1002/aic.18705). for SPPS. DMF is already regulated in tion preparation, epoxidation reaction,
Europe and TFA is a member of the poly- solvent separation, solvent recycling
One-step formation of urea fl uoroalkyl substances (PFAs) family (which was over 99%) (even biobased
from CO and N using water and hence it is advisable to avoid. These solvents can be used). The minimum of fossil fuel-based desulphurization
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microdroplets 2 authors have referred to MSA as the so price of the product was assessed as process. This title process was known
called “green acid par excellence” and €0.68 per kg when integrated with an as Muller-Kuhne process. This process
X. Song et al have sprayed water micro- is stronger than TFA. The eff ectivity existing pulp mill or biorefi neries. This could be competitive with limestone
droplets onto graphite mesh covered of MSA depends on the solvents used looks promising. (ACS Sustainable derived C. (ACS Sustainable Chem. Diff erent ratio of reactants was studied of 1000 mAh per gm. After 100
with a CuBi O coating using a 1:1 and methylene chloride (DCM) is used Chem. Eng., 2025; DOI: 10.1021/ Eng., 2025; DOI: 10.1021/acssusche- and the resin was fully characterized; cycles about 88% capacity was retained.
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mixture of N and CO as the neutralizing with MSA at 1.5% which removes all acssuschemeng.4c 0314c). meng.4c08838). DSC was adopted to study the kinetics. (Chem. Eng. Jl., 2025, 509, 1 April,
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side-chain protecting groups, except the Valorization of phosphates ore Reactive extrusion was adopted. (Green 16/226; DOI; 10.1016/ j.cej. 2025.
tritryl group of His (and this continues to fl oatation tailings (POFT) for Full recovery of epoxy resin Chem., 2025; DOI: 10.1039/D4GC 161226).
be challenging). (ChemSusChem, 2025; stepwise separation of Ca and wastes into Bisphenol A and 05352).
DOI: 10.1002/cssc.202402752). Mg values epoxy monomers via Lewis acid Kinetic study on the solid-liquid
Performance evaluation of (LA) CO emission reduction in lime diazo coupling reaction with
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gas. The resulting microdroplets contain green and conventional sol- H. Gu et al have referred to POFT being X. Li et al have worked on the title and soda ash manufacturing time-varying viscosity
urea. This was done at 25°C and 65°C vents in reversed-phase liquid rich at Ca, Mg, and P. These authors have problem which is now attracting a lot through anion exchange
H-L. Wei et al have been able to fi nd
and raise in temperature had favorable chromatography based on the developed a process of leaching POFT attention to take care of used wings of A. Baral et al have reported that anion the rate-controlling mechanism under
eff ect. (J. Am. Chem. Soc., 2023; DOI: separation of non-polar and with phosphoric acid. Their results show windmills (This subject has been exchange process to a co-produce CaO various experimental conditions. The
10.1021/avs.3c 10784). polar substances that Ca and Mg could be separated, covered in this column). and Na CO from CaCO and NaOH diazo coupling reaction was between
generating Ca(H PO ) and then decom-
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Synthesizing highly crystalline O. Kalisz et al have worked on replacing posing to form CaHPO (at 80°C). The can reduce the carbon footprint of both 2-naphthol and diazo salt as a template
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graphite powder from bulk conventional solvent like acetonitrile leaching effi ciencies of Ca and Mg were These authors have reported a strategy chemicals through industrial symbiosis. reaction was adopted between 25 to
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polyethylene waste for Li-ion (ACN) and methanol with greener alter- 16.6% and 93.4%, respectively, using of selectively breaking the C(Sp )-O The global production of soda ash is 40°C. Rheological studies indicated that
battery anodes natives – ethanol and dimethyl carbonate 3.0 molar phosphoric acid at 80°C and bonds using commercially available around 64 mtpa and this can co-produce the reaction system exhibited non-New-
(DMC) – in chromatographic separa- 120 min with the liquid-solid ratio of low-cost LA and reconstructing the 50 mtpa lime in economical, sustainable tonian shear thinning feature. The con-
K-Joong Kim et al have worked on valori- tions. Chromatographic separations 3 ml/gm. Recoveries are reported and broken C(Sp )-N bonds with NaOH to manner (16% gross margin) and simulta- trolling mechanism was discerned, and
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zing polyethylene waste via graphite in were carried out on two diff erent mix- treatment of 1 ton of POFTs yields a high effi ciency and fully recycle resin neously reducing emission of 37 mtpa of the overall rate constant control model
154 Chemical Weekly June 10, 2025 Chemical Weekly June 10, 2025 155
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