Page 174 - CW E-Magazine (25-6-2024)

Special Report Special Report

atmospheric distillation and extractive of Ag tz to improve processability for Process design framework for from the plate.” Elevated crystallization types of polymers/resins have been Phosphogypsum (PG)
4
4
distillation in several innovative inten- selective olefin adsorption and thus inorganic salt recovery using temp. of 70 C was beneficial. [Org. considered with grafting of boronates.
o
sifi ed downstream processes.” highly loaded with very low agglomerate antisolvent crystallization proc.Res.Dev., 2023, DOI:10.1002/acs. Comparison has been made with the Role of additives : Modifi ed
degree membranes can be synthesized. (ASC) oprd.3C00263]. state-of-the-art chromatographic sepa- hemihydrate (HH) PG
This strategy allowed over 99.2% of This gave a selectivity of 39 for C H / ration over Ca ion exchange resins. morphology and enhanced
2+
6
3
isopropanol and 100% of acetone to be C H mixtures with permeability rates of Membrane Distillation (MD) : [GreenChem., 2023, DOI:10.1039/ fi ltration performance of
8
3
recovered with high purity products at 99. A wide range of temp. and pressure P. Sahu et al have suggested that ASC How to make it greener D3GC04049F]. wet-process phosphoric acid
99.8 wt%. Energy requirements were can be tolerated and have long-term can be an alternative separation method Gontrarek-Castro and Castro-Munoz
reduced through advanced heat pumping stability. [Angew.Chem.Intl.Ed., 2023, against evaporating or cooling crystalli- have referred to MD as a promising A microporous poly(arylene X. Huo et al have emphasized that
(mechanical vapour recompression) and DOI:10.1002/anie.20231609z]. zation for salt recovery from aq. salt alternative to conventional seawater ether) platform for mem- the normal morphology of HH PG is
heat integration techniques. This work solutions. This paper has aimed to deve- desalination (This column has covered brane-based gas commonly needle-like due to strong
supports sustainable industrial fermenta- Assessment of the new lop a methodical framework combining some papers on MD). separation acidic crystallization environment and
tion. This also reduced the requirements kinetically limited LDF solubility behaviour, phase balance, anti- this is unfavourable for fi ltrations. In
of fresh water. [J.Chem.Technol.Biotech- model for diffusion-limited solvent selection and solvent recovery. These authors have discussed how to S. Gou et al have referred to energy a clever way additives were added to
nol.,2023, DOI:10.1002/jctl.7576]. This was used to separate Na SO from make MD greener as non-biodegradable
2
4
separation by PSA NaCl. Technoeconomic feasibility is polymers and toxic solvents are involved effi cient membrane-based process for get a large aspect ratio to be varied to
Simulation and experimental reported. This work is expected to guide besides fl uoroalkylsilanes are involved. gas separation. Microporous organic realize higher filtration. D-Glucitol
polymers (MOPs) combine benefits (DG) reduces aspect ratio from 2.076 to
study of solid-liquid extraction S.A. Adeguniu et al have assessed the utility of ASC. [ACSSustainableChem. Further high amount of wastewater is for gas sieving and solution process- 1.583 and leads to a lower bulk density
new kinetically limited linear driving Eng., 2023, DOI:ACS.10.1021/acssus-
of coal tar residue (CTR) force (KLLDF) model against the chemeng.3C05243]. generated from membrane fabrication ability. Synthesis of title membranes is and a larger porosity of the formed fi lter
based on different extractants traditional LDF model for predicting reported which includes incorporation cake. [ACS Omega, 2023, DOI:10.1021/
the behaviour of diffusion-limited sepa- Experimental and molecular of functionalities; separations of CO / acsomega.3C08259].
2
B. Yang et al have worked on the hazard- ration by PSA. The kinetic separation CH and (H S+CO /CH ) are convered.
4
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2
2
ous CTR which contains toxic polycyclic insights on the separation [Angew. Chem.Intl.Ed., DOI:10.1002/ Revealing mechanism of
aromatic hydrocarbon (PAHs). This can of indole from wash oil by anie.202315611]. hemihydrate – dihydrate PG
be processed into high-value-added fuels tetraethylammonium – based transformation and minimizing
and chemicals. Ethyl acetate, ethanol and ionic liquids (ILs) New supercritical method phosphorous loss in wet process
n-hexane were chosen as extractants and to capture CO from N phosphoric acid (PA)
2
2
mass transfer studies were carried out. W. Zhang et al have worked on the title and H gas mixture in NH /
2
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n-Hexane extracted the highest content system. The distribution coeffi cient and processes. There is a need to integrate NH CONH production plants X. Huo et al have studied the infl uence of
of aliphatic hydrocarbons; ethyl acetate of 85 vol% CH +15 vol% CO using selectivity of 304 kinds of ILs were MD systems with low-grade waste heat. 2 2 temp., H SO content, and P O content
2
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4
2
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2
extracted the highest content of oxyge- MSC 3K-172 carbon molecular sieve predicted. The IL could be recycled These authors have reviewed the above R. M. El-Maghraby et al have come on the hydration kinetics and dihydrate
nated compounds; ethanol extracted was studied using two different 1-bed with water and repeated uses were satis- aspects including making membranes out with an interesting and potentially PG morphology during the HH-DH wet
the highest content of PAHs. This work 6-step PSA cycle schedules, A and B. factory. The extraction effi ciency was without solvents. Thus, there is scope to useful way of separating CO in ammo- process. There are solubility differences
2
provides a basic for industrial utilization of Eleven PSA experiments were carried 91.6%. With this background a process have biodegradable polymers, green sol- nia and urea plants. This strategy was between HH and DH. A small aspect
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CTR. [ACs.Omega.2023, DOI:10.1021/ out at 22 C and 345 and 101KPa. [Ind. containing liquid-liquid extraction and vents, elimination of fl uoro compounds, tested experimentally at 38 C and 200 ratio can be realized under low supersatu-
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acsomega.3C06290]. Eng.Chem.Res.2023, DOI:10.1021/acs. azeotropic distillation was designed and etc. [GreenChem., 2023, DOI:10.1039/ bar and through a two-stage separation, ration conditions and this also leads to
iecr.3C03568]. the purity of the product was 99.9%. [AI- D3GC03377E]. a high-purity CO stream of 99% conc. low P loss and improved fi ltration. [Ind.
2
Uniformly distributed mixed ChEJl, 2023, DOI:10.1002/aic.18311]. and pure H and N stream of 96.6 and Eng.Chem.Res., 2023, DOI:10.1021/acs.
2
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matrix membranes via a Hierarchical porous MOF-199 Adsorptive separation of 91% conc. were obtained, respectively. iecr.3C03040].
solution processible strategy and zeolite composites with A continuous rotary fi ltration saccharides and polyols over ASPEN HYSYS software were used
for propylene/propane high adsorption performance for the separation and purifi - materials functionalized with for integration into NH and urea plants Nanofi ltration (NF)
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2+
+
separation for both toluene and acetone cation of an API boronate groups and the separated pure N /H stream is membranes for Mg /Li
2
2
[This column has covered several used in NH plant. There is a claim of a separation
3
papers on separation of C H / C H via X. Meng et al have synthesized FAU (n)/ W. Wu et al have developed a continuous I. Delidouich and V. Toussaint have reduction in capital and operating costs [There is a lot of activity pertaining to
LSP
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3
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2+
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adsorption and membrane in place of MOF-199 composites which have rotary fi lter and tested with a commer- referred to biomass-based value chains with a total saving of 330-million dollars the separation of Mg and Li obtained
capital and energy intensive high pres- shown a good adsorption property for cially available API. “The fi ltration unit where saccharides and polyols play which corresponds to 44.6% of the total from different sources. This column has
sure cryogenic distillation columns (also both weekly polar toluene and strongly consists of a rotatable plate that receives key roles and their recovery is chal- cost compared to conventional amine- covered this subject.]
C H /C H separation). polar acetone. Good adsorption-de- a continuous fl ow of feed material that is lenging. This review has referred to based capture process. This appears
2 4 2 6
sorption stability is reported. [Ind.Eng. distributed along the radius of the plate, materials bearing boronate groups for to be economically feasible. [Ind.Eng. Y. Zhang et al have reported that PET-
Y. Su et al have used a ZIF-67 MOF as Chem.Res.,2023, DOI:10.1021/acs. forming a thin cake. The cake is conti- separating the above products via affi - Chem.Res., 2023, DOI:10.1021/acs.iecr. based NF membrane shows great po-
fi ller along with surface modifi cation iecr.3C02910]. nuously fi ltered, washed, and removed nity adsorption processes. Different 3C02529]. tential for the title separation, due
174 Chemical Weekly June 25, 2024 Chemical Weekly June 25, 2024 175
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