Page 167 - CW E-Magazine (27-8-2024)

Special Report

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

Processes and Products

Separation Technology

All-weather atmospheric
water harvesting enabled by
hygroscopic hydrogel paint

L. Wang et al have referred to hygro-
scopic hydrogels receiving widespread
attention for effective atmospheric water
harvesting. These authors have reported
facile and processable moisture-harvest-
ing hydrogel paints, which have high
tuneability and processability. These
products can harvest atmospheric water
with a broad range of relative humidities
from 10-90%, going up to 50% of hy-
drogel’s own weight. Cycling stability
is reported. The authors have reported
Ionic liquids (ILs) and A close-loop integrated many desirable features of the title pro-
activated carbon: Effective process of bipolar membrane duct. (ACS Apple. Polym. Mater., 2023;
materials for the sustainable electrodialysis (BMED) and DOI: 10.1021/acsapm.3C01561).
production of fresh water resin adsorption for resource
from salt effl uents recovery from high-salinity Inverse adsorption separation
phenolic waste water from the of N O/CO in AgZK-5 zeolite
2
2
R. Ouchn et al have referred to water manufacture of salicylic acid
stress in Morocco and seawater desali- (SA) L. Wang et al have reported a series of
nation is part of the solution. There is silver (Ag) exchanged zeolite and have
reference to membrane distillation (MD) studied the infl uence of cation types on
for retentate from desalination plants. SA continues to be manufactured by CO -N O separation. The Ag exchanged
+
2
2
Kolbe-Schmidt reaction of sodium zeolite allowed preferential adsorption of
These authors have made a composite phenate with CO . The Na salt of SA is N O over CO from their mixtures. N O
2
2
2
2
membrane based on polymer supports – neutralised with sulphuric acid, result- has application in daily life and industrial
polyvinylidene fluoride (PVDF) and ing in aqueous wastewater containing production, like anaesthetic, foaming
polysulfone (PSU) – and ionic liquid, Na SO . agent, etc. The tail gas in making adipic
4
2
trioctylmethylammonium oleate acid via oxidation of cyclohexanol/-one
(TOMAO) and doped with activated Y. Liu et al have adopted the title stra-
carbon. This membrane was adopted in tegy. The BMED process gave desalina-
Direct Contact MD for diffusion and ex- tion rate of 99.4% and the concentration
traction of water vapour. This membrane of H SO and NaOH were 0.56 and 0.78
4
2
has good hydrophobicity (126.04°) and moles per litre. The effl uent to BMEA
high porosity (91.07%) and salt rejection feed compartment was treated into
was 99.03% with a signifi cant fl ux of two-stage resin unit and satisfactory re-
18.29 kg per sq. m. per hour; at 60°C. generation was realised and high purity
This membrane looks promising. (ACS phenol and SA were obtained. (Chem.
th
Sustainable Chem. Eng., 2024; DOI: Eng. Jl., 2024, 482, 15 Feb, 148681;
10.1021/acssuschemeng.3C04470). DOI: 10.1016/j.cej.2024.1468681).
Chemical Weekly August 27, 2024 167
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