Page 158 - CW E-Magazine (23-4-2024)

Special Report Special Report

FDA. Chiral membranes are highly crystallisation is proposed to reduce the Advancing sustainable phos- drogen-bonded organic frameworks
promising and various techniques have neutral oil content. Here N compounds phorus (P) removal and reco- (HOFs). Challenges and future deve-
been tried for the preparation of these are effectively separated from phenolic very with MOFs lopments of various adsorbents are
membranes, encompassing electrostatic compounds as MEA and naphthalene [This column has referred to the de- given. (Sep. Purfn. Technol., 2024/330,
spinning, interfacial polymerisation, compounds from the minimum azeo- pleting resources of phosphate rock Part A, 1 Feb,125252; DOI: 10.1016/j.
st
surface graft modifi cation, in situ growth trope. Subsequently, N products are and alternative ways of recovering is seppur.2023.125252).
and phase inversion methods. This separated. (Ind. Eng. Chem. Res., 2023; receiving attention.]
review gives a systematic analysis of DOI: 10.1021/acs.iecr.3C01388). Boosting CO absorption and
2
different preparation processes. (Sepn. D. Gao et al have referred to MOFs as desorption of biphasic solvent
Purfn. Technol.; DOI: 10.1016/j.sep- Pd extraction following met- highly promising materials for waste- by nanoparticles for effi cient
pur.2023.124898). al-catalysed reactions water treatment due to their high surface carbon dioxide capture
area and tunability. This review discusses [There is a renewed interest in absorb-
Investigation into the enhance- M. Economidou et al have worked on the practical utility of MOFs. Challenges ing CO in amines and this column has
2
ment of gas liquid mass transfer this problem of considerable importance in dealing with P-rich wastewater are covered many papers to show that no
of absorption of H S by MDEA as Pd catalysed cross-coupling reactions technology is mature; it may be recalled
2
with carbon quantum dots are commonly encountered and removal that 1960’s/1970’s had a lot of interest in
of Pd is very important from regulatory
(CQDs) angles. This review addresses the cur- A comparative study of electro- and Li and NFM are being considered this area besides novel amines.]
+
rent approaches from organic solution. deposition and sodium dithio- for this divalent/monovalent ion sepa- B. Yuan et al have studied the intro-
M. Ma and M. Zhao have used N-doped Selected examples and their successful nite reduction for recovering ration. N. Li et al have attempted to duction of nanoparticles in the solvent
CQDs, which were prepared by the application in industrial-scale processes gold in gold-rich solution from improve selectivity and permeability to improve the mass transfer rates for
hydrothermal method and fully char- are reported. The recoveries, based on the adsorption of thiosulfate by incorporating GC with amphipathic absorption as well as desorption. These
acterised. Low concentration of CQDs adsorption, extraction, precipitation solution by ion exchange resin cavities onto polyamide chains using authors used powder of TiO and SiO
2
2
showed good stability and 0.01 vol% and crystallisation, are reported. (Org. interfacial polymerisation (IP) reaction, in nanoscale to prepare nanofl uid for
gave 26.6% improvement over the base Proc. Res. Dev., 2023; DOI: 10.1021/ [Gold recovery from lean ores continues employing polyethylene imine (PEI) and absorption; 0.06 wt% of 30-nm TiO
2
solution. (ACS Omega, 2023; DOI: acs.oprd.3C00210). to be carried out using sodium cyanide trimesoyl chloride (TMC). This strategy gave excellent performance. The liquid
10.1021/acsomega.3C03597). (NaCN) with the accompanying hazards, has given Mg-Li separation coeffi cient side mass transfer coeffi cient increased
including in wastewater. There is an in-
Fluorine (F)-boosted kinetic of 23.6. (Sep. Purfn. Technol., 2024, by nearly 12%. 0.06 wt% of SiO at
2
Simultaneous extraction of and selective molecular sieving discussed and research directions are creasing attention for thiosulfate-based 330, Part A, 1 Feb 2024, 125206; DOI: 50-nm scale promoted desorption. Bi-
st
phenol (P) and naphthalene (N) of C6 derivatives given. (About 20-mtpa of phosphate process for the recovery of gold. This 10.11016/j.seppur.2023.125206). phasic solvent like DEEA-AEEA and
aspect has been previously considered
compounds from tar rock are mined worldwide and about in this column.] MEA-sulfolane were used. (Sep. Purfn.
B. Moosa et al have utilised F to improve 3.4-mtpa enters the water column through Crystalline porous materials as Technol., 2024, 129, 15 Jan, 125108).
th
J. Guo et al have referred to low-rank the hydrophobic profiles of leaning anthropogenic activities. This rock is Thiocyanate, thiourea and glucose-based a versatile platform for C H /
4
2
coal tar having abundant phenolic pillararenes to give a substantial kinetic unevenly distributed in the globe and processes have their limitation. NaCN C H separation Impact of additives on drug
2
6
compounds. Extraction of phenol with selective adsorption of benzene over cy- about 75% of PR reserves are located in continues to be used as it works under The separation of C H /C H conti- particles during liquid antisol-
6
2
4
2
monoethanolamine (MEA) is a promi- clohexane, 20:1 for benzene. The crystal Morocco and Western Sahara. (Chem. alkaline conditions and ambient tem- nues to attract attention as the existing vent (AS) crystallisation and
sing alternative to caustic washing. structure provides the clue for the above Eng. Jl., 2023, 475, 1 Nov, 145949). perature and the leaching rate is high. cryogenic distillation is expensive both subsequent freeze-drying (FD)
Naphthalene poses some problems. selectivity. This adsorbent is comparable There are problems in recovering gold in from capex and energy view points (This
A conceptual process involving MEA to MOF UIO-66. (Angew. Chem. Intl. Two-dimensional transport the complex with thiosulfate. Z. Dong et column has covered some papers.) P. Ghosh et al have studied the impact
extraction, azeotropic distillation, and Ed.; DOI: 10.1002/anie.202311555). dispersive (TD) model for sepa- al have developed electrodeposition and of single or combination of additives
rating glycolic acid (GA) and sodium dithionite reduction methods to X. Lin et al have summarised the on the generation of nanosuspension
NaCl with ligand exchange recover gold from rich solutions based latest development in MOFs and hy- of two poorly water-soluble APIs, viz.,
chromatography (LEC) on thiosulfate. (Sep. Purfn. Technol.,
2023, 328, 1 Jan (2034), 125053).
st
J. Zhang et al have referred to the title Tuning composite nanofi ltra-
model for the separation and simulation tion (NF) membranes (M) with
were done for elution. The external gamma-cyclodextrin (GC) for
transfer diffusion was the rate-con- improved Mg / Li selectivity
2+
+
trolling step during adsorption of GA.
(Ind. Eng. Chem. Res., 2023; DOI: Li ores invariably contain Mg and the
2+
10.1021/acs.iecr.3C01398). recovery process involves salts of Mg
158 Chemical Weekly April 23, 2024 Chemical Weekly April 23, 2024 159
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