Page 176 - CW E-Magazine (25-6-2024)

Special Report

to its positively charged surface and Many uses are covered. [Chem.Eng. adsorbent had a high breakthrough sulfur
tunable bore size. These authors have Magazine, 2024, Jan]. capacity of 39.0 mg/gm of 80 C. This
o
used ethylenediamine terminated poly- adsorbent can be regenerated in situ at
ethyleneimine as the monomer which Hydrogen-bonded 280 C. [Sep.Purfn.Technol., 2024, 336,
o
is reacted with trimesoyl chloride via frameworks containing 25 May, 126305; DOI:10.1016/j.sep.pur.
interfacial polymerization. With the aliphatic 3D linkers show 2024.126305].
best performing NF membrane Mg high-capacity water vapour
2+
rejection was 99.2% and there was sorption Integrating binary organic
steady fl ux. [J.Membrane Sci, 2024, 693, phosphonic acid (OPA) into
Feb, 122351; DOI:10.1016/j.memsci. Capturing water from air, even at low nanofi ltration (NF) membrane
2023.122351]. humidity, is attracting a lot of attention, for high precision separation
particularly in arid areas. P. Muang-Non of mono-/divalent ions
Liquid membrane coupled et al have made the title product from
electrodialysis system for tetra-ammonium component and three W-S. Yang et al have referred to the
highly effi cient Li recovery dimension cubane and bicyclopentane shortcoming in NF membranes for
from fl y ash acid leaching dicarboxylate linkers. This works at realizing better selectivity for mono-/
solution very low relative humidity. [Chem. divalent ions, due to weak charges and
Communications, 2024, DOI:10.1039/ structure defects. A novel binary organic
Li Cui et al have referred to high D3CC05286A]. phosphonic acid, alendronic acid (AA)
Li-bearing coal ash (CFA) and recovery was used as an aq. co-monomer via
of Li poses many problems. The Highly selective capture interfacial polymerization (IP) to create
title method was used to separate Li of SO by low viscosity negatively charged NF membranes with
+
2
from the CFA leach liquor. LMTB- 1,2,4-triazole t[Emin] deep both higher charge density and pore
P+[HOEmim] [NTF2](v/v, 5:5) exhibits eutectic solvents (DESs) size homogenity. NaCl/Na SO system
4
2
best recognition. The presence of Al [The removal of SO from industrial was studied. Further Cl resistance was
3+
2
can be tackled. Most multivalent ions waste gases, including boilers based good. [Sep. Purfn. Technol., 2024, 336,
2
are hindered. [Chem.Eng.and Process- on feedstocks containing S is becoming 25 May, 12628; DOI:10.1014/j.sep.
ing – Process Intensification, 2024, increasingly important.] pur.2024;126287].
195, January, 109650; DOI:10.1016/j.
cep.2023.109650]. L. Wang et al have used the title DESs Air-gap Membrane Distillation
for removing SO even from lean (MD) of industrial brine
2
MOFs (Metal-Organic mixtures. At 25 C this absorbent has a
o
Frameworks) capacity of 18.15 mol/kg (102.2 KPa) P. Ugarte et al have worked on the effl u-
[This column has covered many papers for SO . Solubility of CO and N2 ent from precipitated silica plant where
2
2
on this subject]. is much lower. These absorbents are Na silicate is neutralized with H SO
2
4
reversible. [Sep.Purfn.Technol., 2024, and thus the aq. phase contains Na SO .
2
4
Scott Jenkins has referred to many appli- 337, 13 June, 126198; DOI:10.1016/j. There authors have evaluated the perfor-
cations of MOFs such as in gas storage, seppur.2023.126198]. mances of the air gap (AG) membrane
molecular separation and catalysis, as distillation (AGMD) in a pilot plant with
their organic and inorganic components In – Situ regenerable Cu/ a fl at sheet membrane module with an
are highly tunable at molecular level. Zeolite adsorbent with effective area of 0.025 Sq. m. The fl ow
More than 100,000 types of MOFs excellent H S adsorption rate and the temp. of brine were found
2
have been reported since 1990s. Here a capacity for Blast Furnace to be signifi cant parameters infl uencing
controllable, three dimensional network Gas (BFG) the magnitude of the permeate fl ux. The
structure at nanoscale featuring highly feed conc. ranged from 120 to 270-gm
ordered pore structure up to high surface E. Cao et al have stressed the impor- per liter and continous 2-month opera-
areas from 1,000 to 10,000 sq.m per gm. tance of desulphurization of BFG for tion was successfully done. 100% salt
can be realized. Li and tricarboxylic cleaner use. Zeolites having specific rejection is reported and the permeate
acids and metals such as Zn, Zr, Al, Fe, SiO /Al O ratios were chosen and conductivity was only 1-12 μS/cm. [Ind.
2
3
2
Cu, etc. are involved. MOFs are now hybrid Cu/Zeolites were synthesized Eng.Chem.Res., 2024, DOI:10.1021/acs.
commercially produced eg. by BASF. by impregnation method. The selected iecr.3C03415].
176 Chemical Weekly June 25, 2024
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