Page 173 - CW E-Magazine (10-9-2024)

Special Report

Micro reactors with multi vari- generalised anxiety disorders. The global corresponding succinimide of toluene
ate external force field used for market exceeds $5-bn per annum]. diamines (TDA), which are separable
chemical process intensification from polyols. Subsequently, TDA
F. Yan et al have worked on a micro- could be reformed through Ru-cata-
T. Ma et al have emphasised CFD’s role reactor and the crystalline product yield lysed hydrogenation or simple hydro-
in optimising microreactors design and was 90%. This reaction was conducted at lysis; 83% recovery is reported. It seems
chemical reactions. There is a growing 40-50°C and took 5-6 min. to achieve the rigid PU foams can be processed in the
demand for high photocatalytic effi- above yield; conventional batch reactor above way, apart from flexible foams.
ciency, high electrocatalytic efficiency, takes 7-8 hours with a yield of only 83%. (Green Chem., 2024, DOI: 10.1039/
extremely fast heating of reaction pro- (Chem. Eng. Process: Process Intensifi- D4GC00819G).
cesses, and prevention of microchannel cation, 2024, 202, August, 109835; DOI
blockage. The traditional microreactors 10.1016/j.cep.2024.109835). Feasibility and advantages of
have struggled to solve these functional continuous synthesis of bio-
challenges. CFD simulation, microfabri- New insight into energy-sav- inspired silica using CO as an
2
cation technology, and micro integration ing calcination of limestone; acidifying agent
technology has allowed the emergence Preparation, characterisation,
of multi variate external force field micro and applications of partially C.A. Shukla et al have worked on
reactors (MEFFM), which can overcome calcined limestone bioinspired porous silica (BIS) via carbo-
the above problems. A variety of situa- nation of sodium silicate with CO This
2
tions have been considered. (Chem. Eng. X. Qian et al have come out with an process allows controlling of mass trans-
Jl., 2024, 493, 1 August, 152508; DOI: interesting concept where an energy- fer rates to get the desired properties of
10.1016/j.cej.2024.152508). saving calcination strategy using low silica and surface area of 500-sq.m. per
temperature, and a controlled heating gm is reported. (ACS Sustainable Chem.
Synthesis of spinnable poly process is deployed to make partially Eng., 2024, DOI: 10.1021/acssusche-
(ethylene terephthalate – co- calcined limestone. This ensures high meng.4c03100).
glycolate) with enhanced activity of porous oxide and signi-
degradability ficantly reduce CO emission and energy Scaling-up continuous pro-
2
consumption. This product was used as duction of mesoporous silica
S. Wang et al have come out with a a precursor for cementitious materials particles at kg scale: Design &
workable strategy of making modified and favourable results are reported. (ACS operational strategies
polyester fibres, as per the title, which Sustainable Chem. Eng., 2023, DOI:
are biodegradable to face the problem 10.1021/acssuschemeng.3c04462). R.B. Jundale et al have demonstrated a
of disposable polyester garments. The continuous flow pilot-scale production
copolymerisations of ethylene glycol, Chemical separation of poly- of highly porous mesoporous silica
terephthalic acid, and glycolic acid urethane (PU) via acidolysis – particles (MSPs) at 1-kg per day rate.
catalysed with stannous octanoate, combining acidolysis with A hydrodynamic study of the unit was
tetrabutyl titanate (TBT) with antimony, hydrolysis for valorisation of undertaken. Nanoparticle synthesis in a
and antimony trioxide is reported. The aromatic amines clogging-free manner is addressed via
dyeability of the melt spun fibre is good. reactant dilution, periodic pulsation and
The PET-GA fibres degraded nearly T.B. Bech et al have referred to PU global slug flow. (Reaction Chem. Eng., 2024,
16 times faster than PET fibres. (ACS production, in 2022, at 26-mtpa. PU is DOI: 10.1039/03RE00707C).
Sustainable Chem. Eng., 2024, DOI: mainly utilised as a thermoset material
10.1021/accsuschemeng.4c00887). and such recycling is different from Rapid production of the an-
thermoplastic material. These authors aesthetic Mepivacaine (M)
The efficient synthesis of Prega- have shown that the well-established through continuous, portable
balin (P) with impurity control acidolysis process can be used to both technology
using a continuous flow system depolymerise PU and separate the polyol
[P, (S)-3-(aminomethyl)-5-methylhexa- and dianiline adducts. Acidolysis with P. Diaz-Kruik and F. Paradisi have
noic acid, is used for treatment of epilepsy, succinic (S), adipic or phthalic acid was worked on M so that it can be readily
neuropathic pain, fibromyalgia, and carried out and S was found to form the made available through a portable facility.

Chemical Weekly September 10, 2024 173

Contents Index to Advertisers Index to Products Advertised