Page 174 - CW E-Magazine (11-3-2025)

Special Report

MP sections. Simulations were done. foam, to provide melamine of 99.5% and granulation is an important tool
There are many benefits of the proposed purity in 95.3% yield. Such foams are for providing agglomerated particles
integration. [This column has covered MP widely used and hence this recycling can with controllable properties. These
with CO reacting with carbon black to play an important role. (Green Chem., authors have advocated the adoption
2
give CO and then Shift Reaction of H and 2024; DOI: 10.1038/D4 GC 04481A). of acoustic-based granulation to widen
2
recycle of CO ] (ACS Sustainable Chem. the methods. Formation of granules
2
Eng., 2024; DOI: 10.1021/accsuschem. A novel approach of using with particle sizes of about 1-3mm is
eng.4c05611). SiC for the reductive demonstrated. (Org. Proc. Res. Dev.
decomposition of industrial 2024; DOI: 10.1021/acs.oprd.4c00347).
Advances in chlor-alkali by-product gypsum (G)
technologies [G comes as a by-product in the manu- Nanocapsulated deltamethrin

Andy Liu of Chemours, has given a brief facture of phosphoric acid via acidu- (DM) combined with
coverage of the title subject. (Chem. Eng. lation of phosphate rock with H SO ; indoxacarb (I)
4
2
Magazine, 2024, 18 Sep.). also, in making HF from CaF + H SO ;
th
2
4
2
etc. Valorization of G, apart from as an M. Gallous et al have reported that the
Perspective on direct additive in cement, is attracting a lot of title combo is an effective synergistic
seawater electrolysis and attention and this column has covered association against aphids. The combo
eletrodesalination some papers.] agrochemicals were encapsulated in
G.H. Moon et al have referred to electro X. Miao and B. Yan have worked out lipids nanocapsules and tested on the
crop pest Acyrthosphon pisum and found
deionization of seawater as an alternative thermodynamics and have stated that good results. (J. Pesticide Sci., 2024, 49,
to conventional seawater RO due to its SiC as an additive for the reductive Issue 3, 168-178; DOI: 10.1584/jpestics.
high energy efficiency and environmental decomposition of G is possible at lower D24-003).
advantages. These authors have covered decomposition temperature and avoid
recent advancements in seawater electro- the generation of liquid phase. 90% The future of phosphoric acid
lysis technologies based in Cl evolution decomposition of G was realized at 950°C
2
reaction. These authors have discussed (in 2 hours). The intermediate product (PA) production – why we
combo processes. (Green Chem., 2024; is 2CaSiO . CaSO and the second stage have to leave trodden paths
4
4
DOI: 10.1039/D4GC 04930F). leads to CaSiO . (Can. J. Chem. Eng.,
4
2024; DOI: 10.1002/cjce.255697). M. Bertau et al have discussed the title
Efficient decomposition of a subject of great commercial importance
melamine-formaldehyde foam Evaluating resonant acoustic as the much-wanted ammonium phos-
into melamine via selective mixing as a wet granulation phates are made via reaction of PA with
disconnection of bonds process NH . The existing process involves
3
acidulation of phosphate rock with sul-
Yang et al have demonstrated a sustain- M.F.L. Villena et al have stressed the phuric acid, leading to precipitation of
able and efficient strategy to selectively importance of the control of powder gypsum (as hemihydrate), which can be
cleavage the specific sp3C-sp3N bond properties as crucial in food, pharma, filtered. These authors have stressed the
of a thermoset melamine-formaldehyde agriculture, mineral processing, etc. importance of alternative processes that
utilize renewable energy and conserve
resources. Sulphuric acid has a dominant
role, which, in turn, is based on sulphur
that comes from sour natural gas and
hydrodesulphurization of diesel/fuel oil.
Non-sulphuric acid processes are dis-
cussed in this paper. Further, seawater is
used instead of fresh water. PARFORCE
process and the Improved Hard Process
(IHP) are alternatives. Renewable ener-
gies are used. (ChemSusChem, 2024;
DOI: 10.1002/cssc.2024.01155).

174 Chemical Weekly March 11, 2025

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