Page 179 - CW E-Magazine (10-10-2023)

Special Report

A rapid wrap-up of what’s new in Operations,

Processes and Products

Renewable Raw Materials

This review has covered the reported
catalytic systems, both homogeneous
and heterogeneous such as tetra-
butylammonium bromide [TBA][Br]IL.
Reaction conditions are covered. (Ind.
Eng. Chem. Res., 2023; DOI: 10.1021/
acs.iecr.2C03747).

Valorisation of red beet waste
(RBW)

M.E. Rosa et al have referred that glo-
bally up to 50% of root crops, fruits and
vegetables produced are wasted. Thus,
beetroot stems and leaves fall in the
A sustainable iron-catalysed above scenario, although some part is
aerobic oxidative C-C and C-O used for cattle food. These authors have
bond cleavage of a lignin (L) reported a new integrated process using
model to phenol (P) and methyl thermo-reversible aqueous biphasic
benzoate (MB) system (ABS) composed of quaternary
ammonium – based ionic liquids (ILs)
[Valorisation of L continues to attract
a lot of attention and this column has citric acid, and epoxidised soybean oil.
covered many papers.]
These thermosets had superior thermal
S. Guo et al have used iron-based catalyst and mechanical properties and degrad-
(Fe-N-C) in the presence of O . The β-O-4 ability. (ACS Sustainable Chem. Eng.,
2
L model compound was successfully con- 2023; DOI: 10.1021/acssuschemeng.
verted to P and MB in methanol solvent. 2C06990).
The conversion was 95% and the yields of Catalytic systems for the
P and MB were about 95% and 63.7%, res-
pectively, with the Fe-N-C-850 catalyst effective fi xation of CO into
2
at 120°C. (Catalysis. Sci. Technol., 2023; epoxidised vegetable oils and
DOI: 10.1039/D2CV01763F). derivatives to obtain bio-based
cyclic carbonates as precursors
Rigid-and-fl exible, degradable, for greener polymers
fully bio-based thermosets from
lignin (L) and soybean oil A. Centeno-Pedrazo et al have worked on
bio-based polyurethanes and/or polycar-
S. Zhou et al have modified L with bonates. This reaction requires attention
glycidol and further reacted with maleic due to low reactivity of the CO molecule
2
anhydride to produce multi-carboxyl L and the nature of the needed substrates,
(MGL), which had improved solubility namely epoxides, which are internal and
in green solvents like ethanol and an sterically hindered, thus hampering the
increased reactivity towards the epoxy CO cycloaddition reaction. Thus an
2
group. Then MGL was reacted with effi cient catalyst is required.

Chemical Weekly October 10, 2023 179

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