Page 172 - CW E-Magazine (14-1-2025)

Special Report

temperature, say 180°C, most of MA
acid groups in OMA resins transform to
hydrophobic imide groups, while some
of them transform to anhydride groups,
which can further crosslink wood by
esterification. Thus, hot pressing work
can be done. These wood-based panels
have favorable bonding strength and
water resistance at a low resin content.
These products are cost-effective. (Ind.
Eng. Chem. Res., 2023; DOI: 10.1021/
acs.iecr.3c01968).
Recent advances of organic
Reactivities of N-Nitrosoamines co-crystals (OC-C) in emerging
(NNA) against common re- cutting-edge properties and
agents and reaction conditions Nutrient removal and recovery applications
[NNA has made a major impact as an from urine bio-mineral forma-
impurity in a variety of drugs such as tion processes X. Wang et al have referred to OC-C
valsartan and other sartans, etc. and as one type of new functional material
it is tracked in a few parts per billion. R.E. Colston et al have emphasised the having gathered significant interest
This column has covered some papers importance of harvesting nutrients from in various engineering areas. Due to
on this subject.] waste with respect to circular economy their diverse stacking modes, rich inter-
in water sector. Urine is a small fraction molecular interactions and abundant
G.A. Hodgin et al have carried out a of municipal wastewater and contains
comprehensive survey of the Reaxys substantial amount of N , ortho-phos-
2
database for all reactions in which NNAs phates (PO ), and COD. The use of
-1
4
functional group is consumed. Different selected microorganisms (names given)
NNAs were considered and Na S O in can result in removal and recovery of
2 2
4
1M aq. NaOH at 50°C is highly effective nutrients through bio-mineral formation
in destroying these nuisance substances. of struvite. Urine was supplemented with
(Org. Proc. Res. Dev., 2024, DOI: Mg . Thus, up to 1 gm bio-struvite per
2+
10.1021/acs.oprd.4c00217). litre of urine was recovered. (ACS Sus-
tainable Resource Management, 2024,
Depolymerisation of PET with DOI: 10.1021/acssusresmgt.4c00025).
ethanol by homogeneous iron
catalysts applied for exclusive Low cost and HCHO-free wood
chemical recycling of cloth adhesive based on water-soluble functional components allow tailoring of
waste olefin-maleamic acid (OMA) physicochemical properties of OC-C.
copolymers A variety of uses are referred in the paper
N.W.B. Awang et al have worked on such as photothermal conversions at
acid-, base-free depolymerisation of C. Chen et al have referred to the prob- room temperature, phosphorescence, etc.
PET with EtOH catalysed by FeCl , lems associates with HCHO resins such Future developments are given. (Angew.
3
FeBr (1.0-5.0 mol %) leading to diethyl as urea/HCHO, phenol/HCHO, etc., Chem. Intl. Ed., 2024; DOI: 10.1002,
3
terephthalate (DET) and ethylene glycol where residual HCHO emission is now anie.202416181).
(EG) exclusively (98-99%, 160-180°C); under serious scrutiny and alternatives
FeCl was better. This was done with would be welcome. In this paper maleic Recycling of wind turbine
3
PET from textile waste to give DET and anhydride and olefins with various struc- blades
recovered cotton waste. Thus, recycling tures were first alt-copolymerised and
should be possible. (Ind. Chem. Mate- then ammoniated to get water-soluble Wind power is making a big impact glob-
rials, 2024, D4 im 00081A). wood adhesives – OMA resins. At high ally and in India as well and contributes

172 Chemical Weekly January 14, 2025

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