Page 181 - CW E-Magazine (9-7-2024)

Special Report

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

Processes and Products

General Degradable carbon fi bre-rein-
forced epoxy resin composites
based on dynamic benzyl ether
bonds

X. Zhang et al have referred to the title
epoxies being used in aerospace, trans-
portation, sports goods, electric fi elds,
etc. The recycling of these epoxy resin
based products poses problems (includ-
ing those used in wind power). These
authors have developed a kind of novel
epoxy monomer containing a dynamic
benzyl ether bond, which further reacts
with commercial amine-curing reagents
to obtain epoxy thermosets. These de-
grade at 190°C in benzyl alcohol under
the catalysis of AlCl . The glass transi-
3
tion temperature is 167°C and a tensile
Polyaluminium Ferric Sulphate 60% of Fe. The polymerisation for low, strength of 91.8 MPa and a Young’s
(PAFs) from Red Mud (RM) medium, and high could be generated Modulus of 2.2 GPa. Thus, it is possible
by adjusting the basicity of the leaching to realise the non-destructive recovery
The alumina industries, for providing solution with 0.7-0.9. 95% of turbidity of the carbon fi bres from the composite
Al O for Al production, leads to a large of coal slurry water could be removed. wastes. (Ind. Eng. Chem. Res., 2023;
3
2
amount of the so-called waste product (ACS Omega., 2024; DOI: 10.1021/ DOI: 10.1021/acs.iecr.3c02854).
RM, which needs to be valorised. (This acsomega.3c07013).
column has covered some papers on this Microfl ow synthesis of a formu-
subject). W. Li et al have come out with New process for Na CO pro-
a process to make PAFs from RM, which duction from Na SO 2 3 lation of phosphorous fertiliser
can be used as a coagulant for wastewa- 2 4 to enhance the P content in soil
ter, including coal slurry water. These Li et al have reported the title process, and P uptake in wheat
authors have used 50% H SO (v/v) which is a variant of the classical
4
2
to leach out more than 90% of Al and Solvay process. Here the authors have T.N.Q. Le et al have used a coiled fl ow
exploited the anti-solvent crystalli- inverter (CFI); a new formulation of P ferti-
sation of unreacted Na SO to separate liser was prepared containing three main
4
2
it from soluble (NH ) SO in a mixed components – a solid P source (biphasic
4
4 2
monoethanolamine (MEA) and mono-
ethylene glycol (MEG) solution. For
this the thermodynamic data on solubi-
lity were measured and modelled. It is
remarkable that anhydrous dense soda
ash with bulk density of up to 1,146-
kg/m was obtained from concentrated
3
Na SO brines reacted with CO
2
2
4
and NH . (ACS Omega, 2023; DOI:
3
10.1021/acsomega.3c07533).
Chemical Weekly July 9, 2024 181
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