Page 168 - CW E-Magazine (27-8-2024)

Special Report Special Report

In one case the impurity at 6% level could pressure up to 10 bar. Two cases of 98%
be purged in a single crystallisation by and 99.5% C H minimum purity were
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switching the crystal form. In two other considered. For the 98% purity C H
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cases where impurity level were 14% recovery was 94.6%; for 99.5%+ purity
and 3.5%, solvent switches solved the the maximum C H recovery was 80%.
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problems. (Org. Proc. Res. Dev., 2024; (Ind. Eng. Chem. Res., 2024; DOI:
DOI: 10.1021/acs.oprd.3C00406). 10.1021/acs.iecr.3C02808).
has N O whose recovery is facilitated in infl uence the performance of subsequent Instantaneous and continuous Application of Taylor Vortex
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the above manner. AgZK-5 has N O/CO unit operations in an undesirable way. preparation of Avermectin Flow Reactor (TVFR) for
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selectivity of 2.2. (Angew. Chem. Intl .Ed., These authors have followed the mod- (A) nanoparticles (NPs) with precise control of nucleation CA, which removes C H effi ciently and 95%. Acetic acid aqueous solution
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2023; DOI: 10.1002/anie.2023.17435). el-free Quality-by-Control (QbC) frame- high gravity anti-solvent in reactive crystallisation also moderate C H removal. The C H 8 had higher dissolution effi ciency and
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work and have improved crystallisation precipitation technology uptake was 177.8 cc (STP) per gm and selectivity and the separation factor was
Mixed matrix membranes which brought out the effectiveness of moderate C H of 52.9 cc (STP) per gm. up to 5038. (Green Chem., 2024; DOI:
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(MMM) incorporating amino- temperature cycling. This also leads to M. Hosoya et al have reported the use The CH uptake was only 7.7 cc (STP) 10.1039/D3GC04800D).
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functionalised ZIF-8-NH improvement in time for fi ltration. QbC Y-J. Dong et al have referred to the of TVFR for reactive crystallisation, per gm. The C H /CH uptake ratio was
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inherent insolubility of A in water and
which requires handling of slurry. The
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in a carboxylic polyimide still has suboptimal performance. These its easy degradation property. The title example chosen was that of imination – as high as 23.1, which to date is higher. Australia’s Spodumene (S):
for molecularly selective gas authors have then adopted model-based approach has been advocated leading to p-hydroxybenzaldehyde reaction with Theoretical calculations were done. The Advances in Li extraction
separation QbC framework for commercial product. enhanced performance. From the CSTR p-fl uoroaniline. This type of reaction recyclability is excellent and lends for technologies, decarbonisation,
The title method was adopted. Finally, method to the title method resulted in realises high shear stress and mixing easy scale-up. (Ind. Eng. Chem. Res., and circular economy
Q. Zhao et al have referred to the use of the nominal temperature profi le gave the 2024; DOI: 10.1021/acs.iecr.3C04499).
MMMs, which combine the advantages desired product. (Org. Proc. Res. Dev., particle size decreasing from 166 to 66 efficiency. This ensures precise con- A.H. Asif et al have referred to the
of polymers and inorganic materials, re- 2024; DOI: 10.1021/acs.oprd.3C00373). nm. The preparation time was reduced trol of nucleation and no adhesion is Selective neodymium abundance of Li in S (LiAl/(SiO ) ) and
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sulting in higher gas permeability. There from 60 min to 1 sec. The addition of observed. (Org. Proc. Res. Dev., 2024; (Nd) recovery from model Australia has world’s largest reserves.
are problems in the above combo mem- Industrial cases of PVP avoids the agglomeration. The DOI: 10.1021/acs.oprd.3C00369). permanent magnets using This review has covered in a comprehen-
branes and the authors have mentioned concomitant precipitation of product so obtained had prolonged cost-effective organic acid sive way the current status of reserves
how the membranes face problems solid-state miscible product – effi cacy and displayed a better killing Phosphorus Ore Floating system
and to overcome hurdles co-polyimide effect for Plutella Xylostella. (Ind. Eng. Tailings (POFT): Treatment
(6FBDA) was designed with carboxylate Impurity phases in solution Chem. Res., 2024; DOI: 10.1021/acs. and disposal technology C. Pozo-Gonzalo et al have worked
side groups to enhance the interfacial crystallisation iecr.3C03802). Valorisation of phosphate rock, parti- on the title subject as Nd is essential
compatibility with amino-functionalised F.L. Nordstrom et al have presented three cularly lower grades, is done and froth for making powerful magnets. The re-
MOF (ZIF-8-NH ). They have explained industrial case studies from the pharma Ethylene purifi cation by PSA fl oatation is carried out. There is a prob- covery of Nd over iron (Fe) from their
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how these combo membranes do a good companies Boehringer-Ingelheim and with the paraffi n selective lem associated with the disposal of the oxides is discussed. A variety of Deep
job. The defect-free MMMs with 50 wt% Merck & Co. Inc. where the title problem MOF–DUT-8 tailings and hence valorisation should be Eutectic Solvents (DES) were conside-
MOF show CO and H permeability of is encountered. They have explained the [This column has covered some papers considered. POFT has been widely used red and the combination of guanidine
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80.8 Barrier and 127.5 Barrier, and with underlying mechanism as to how the on PSA for C H /C H and C H /C H in agriculture and industry fi elds, parti- and their processing facilities. Several
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a CO /CH and H /CH selectivity of impurities get incorporated via the Solu- separation where the cryogenic distil- cularly in fertilisers, soil remediation, metallurgical processes are involved,
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89.4 and 141.7, respectively. (J. Mem- bility-Limited Impurity Purge (SLIP) test. lation systems are capital as well as building materials, roadbed materials, ranging from salt roasting to acid leach-
brane Sci., 2024, 693, Feb., 122326; Different approaches were made based on energy intensive.] etc. The concept of circular economy is ing. However, here we have excessive
DOI:10.106/jmemsci.2033.122326). the prevailing solid-state miscibility, solid V.V. Santana et al have come out with a important. X. Li et al have reviewed this pressure on reserves, energy, and waste
Crystallisation form landscape, and solvent solubilities. new attractive strategy to have selective subject. (Ind. Eng. Chem. Res., 2024; management. Recent technological
adsorption instead of C H DOI: 10.1021/acs.iecr.3C02747). advancements are covered. (Ind. Eng.
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Digital design of an rather than C H which is Chem. Res., 2024; DOI: 10.1021/acs.
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agrochemical crystallisation the normal case and this A robust Al-based MOF for iecr.3C04048).
process via two-dimensional can lead to many benefi ts highly effi cient Natural Gas
population balance modelling with respect to capital and (NG) purifi cation hydrochloride (GUC) and hydrogen New membranes for
(PBM) recurring costs. Modelling bond donors were less benefi cial for dehydrating organic solvents
was done and adsorption Many NG have considerable content of the leaching of Nd O with a maximum
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W-L. Wu et al have referred to the prob- equilibrium data were col- ethane/propane/butane (more so in the value of 78% in comparison with the G. Ondrey has covered the recent deve-
lem in solution crystallisation where lected. DUT-8 was used associated gas) and M. Chang et al have individual system. In the absence of lopment by Asahi Kasei Corp. of mem-
needle shape crystals are formed which at three temperatures and come out with an Al-MOF, CAU-3-ND- GUC the maximum dissolution was brane for dehydrating solvents without
168 Chemical Weekly August 27, 2024 Chemical Weekly August 27, 2024 169
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