Page 174 - CW E-Magazine (14-1-2025)

Special Report

without heating and pressurising. (Angew. and/or low selectivity. These authors Eng., 2024; DOI: 10.1021/acssusche-
Chem. Intl. Ed., 2024; DOI: 10.1002/ have used PTA, which activates CH with meng.4c04754).
4
anie.202413132). O to give CH OH selectively. Under Influence of long-branched
Equipments
2
3
continuous operation, 94% CH OH Equipments
3
Upcycling of polyamide wastes to selectivity is reported. The current density chains on the crystallisation
tertiary amines using Mo single towards CH OH production increased behaviour of polyglycolide (PG)
3
atoms and Rh nanoparticles over 40 times in comparison to the W. Liu et al have studied the title sub-
direct electrochemical processes. (Angew. ject across different temperatures under
M. Tang et al have reported a novel Chem. Intl. Ed. 2024; DOI: 10.1002. isothermal and non-isothermal crystal- 4000 + +
4000
strategy to convert polyamide wastes to anie.2024 17251). lisation conditions. The crystal growth
tertiary amines using H in acetic acid at Proof of concept for the organic process, crystal morphology, and structural
2
temperature around 180°C, and catalyst evolution of PG crystals was studied.
anatase TiO supported Mo single atoms electrorefinery technology with This study should be useful. (Ind. Eng.
2
and Rh nanoparticles. The polyamine actual effluents Chem. Res., 2024; DOI: 10.1021/acs.
first goes to diacetamine intermediates J. Parrilla et al have worked on a real iecr.4c01301).
via acidolysis, which are subsequently waste coming from a cashew nut factory
hydrogenated and synergistically hydro- and have shown the effect of the current Zn-catalysed sustainable one-
deoxygenated to make tertiary amine densities of both the anode oxidation and pot synthesis of rubber accele-
(carboxylic acid does not get hydrogena- electrochemically assisted separation pro- rator TMTM and lubricant
ted) (Angew. Chem. Intl. Ed., 2024; DOI: cesses for the performance of the systems. additive TPPT
10.1002/anie.2024 16436). It seems that the title strategy is useful as
valuable species can be obtained from X-J. Li et al have come out with a greatly
Fundamental, technical and envi- the destruction of pollutants. Oxalate is improved process for simultaneously pro-
ronmental overviews of plastic the primary product; separation of oxa- ducing the widely applied rubber accele-
chemical recycling late is around 20% in the electrodialysis rator, tetramethylthiuram monosulfide
stage. (Ind. Eng. Chem. Res. 2024; DOI: (TMTM), and lubricant additive, triphenyl-
H. Luo et al have referred to chemical re- 10.1021/acs.iecr.4c02235). thiophosphate (TPPT). The starting
cycling as a collection of emerging inno- material is non-toxic tetramethylthiuram LIFTING BAG TYPE CENTRIFUGE
MACHINE WITH LIFTER
vative technologies that transform plastic Membrane matters in paired disulphide (TMTD) and triphenylphos-
waste into base chemicals, monomers electrolysis: Synthesis of 2,5- phite (TPPi). The catalyst is ZnO, which
and feedstocks. There are seven types of furanedicarboxylic acid (FDCA) is efficient and readily recyclable. The
recyclable plastics, and this paper gives renewable gamma valerolactone (GVL)
an overview of dealing with them and pre- and 2-butanone (B) is used as a green solvent. Excellent yields
sents a critical perspective. (Green Chem. [Paired electrochemical processes have are reported. (ACS Sustainable Chem.
2024; DOI: 10.1039/D4GC03127J). a lot of merits as anodic and cathodic Eng., 2024; DOI: 10.1021/acssusche-
reaction are carried out simultaneously. meng.4c04363).
Electrochemical processes This has been commercially adopted, e.g.,
by BASF to convert p-methoxytoluene to Continuous flow Friedel-Crafts
Electrothermal conversion of p-anisic aldehyde and phthalic anhydride alkylation catalysed by silica-
CH to CH OH at room tempe- to phthalide.] supported phosphotungstic
4
3
rature with phosphotungstic acid (PTA)
acid (PTA) T. Harhues et al have conducted the title Z. Csaszar et al have come out with the
oxidation and reduction reactions simul-
[The “dream” process of converting CH taneously. Thus, on anode hydroxymethyl title environmentally friendly process.
4
directly to CH OH continues to attract furfural is converted to FDCA and on The test reaction was alkylation of toluene
3
a lot of attention and this column has the cathode acetoin is reduced to B. The with 1-octene; wt% of PTA varied from +918169061250
covered some papers.] influence of an ion exchange membrane 20-70 wt%. Catalyst was fully characte-
J. Chang et al have referred to the advan- has been studied. A stable process with a rised. The best wt% of PTA was 50% and
tages of electrochemical methods which bipolar membrane has been developed. this was highly active, selective and stable
are safe and possibly avoid the use of A combined yield of 140% is reported. catalyst. The catalyst was successfully
noble metals. However, these suffer from This work is directed towards valori- regenerated. (Topics in Catalysis, 2024, ISO 9001:2015
low yields due to limited current density sing biomass. (ACS Sustainable Chem. 67, 1271-1285).

174 Chemical Weekly January 14, 2025

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