Page 174 - CW E-Magazine (24-10-2023)

Special Report Special Report

microporosity and abundant seeds with raw material will be avoided. (Ind. Eng. Tun ing pore polarization to These constitute as a safe-delivery
high aspect ratio of over 150. These ZIF- Chem. Res., 2023; DOI: 10.1021/acs. boost ethane/ethylene separa- tool, while simultaneously catalysing
8 membranes with thickness down to iecr.2c04409). tion performance in H -bonded organic reactions with conversions
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100-nm exhibit an ultra-high C H /C H organic frameworks (HOFs) and yields comparable to the reactions
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separation performance and superior Role of tailor-made additives [This column has covered many papers utilising the toxic gases directly.
long-term stability. (Angew. Chem. Intl. (TMAs) in crystallisation from on the separation of C H /C H and Examples are: aromatization, amino-
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Ed.; DOI: 10.1002/anie. 202302355). solution C H /C H by non-cryogenic distillation, carbonylations, and carbonylative
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Crystallisation Y. Zhu et al have reviewed the title-sub- which is energy and capital intensive, Suzuki-Miyaura coupling reactions.
Further MOFs can be recycled with-
ject where the additives, which share and selected adsorbents have been out any loss is product yield. [Angew.
a similar molecular structure with the discussed.]
Preparation of ultrafi ne nitro- parent molecule, are called TMAs. This Chem. Intl. Ed.; DOI: 10.1002/anie.
guanidine (NG) by one-step inclusion has a signifi cant impact, and Y. Zhou et al have referred to the great 202113909].
crystallisation in an impinging the infl uence on nucleation and growth potential of HOFs energy saving for
stream-rotating packed bed are discussed. The effect on polymor- the title separation. Two graphene- Selective Pd recovery and hetero-
sheet like HOFs by dimethylamine
phism, crystal habit, crystal size, and geneous catalysis
H. Li et al have come out with a useful chirality was studied. Futuer develop- cation to HOF-NBDA, which makes
strategy to get ultrafi ne NG particles, in ment is covered. (Ind. Eng. Chem. Res., the pore surface of HOF-NBDA K.S. Song and A. Coskun have referred Hydrothermal Reactive Distil- fural are enriched in the syrup with a yield
contrast to the traditional long process 2023; DOI: 10.1021/acs.iecr.2C04025). non-polar. This allows interestingly to the use of Pd-based catalysts, which lation (HRD) of biomass and up to 23 mol%. [Ind. Eng. Chem. Res.,
and easy pollution caused by recrystal- selective to C H , which is highly are widely used in industry and recyc- biomass hydrolysates for the 2023; DOI: 10.1021/acs.iecr.3C00259].
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lisation. The effect of operating para- Layered zeolite for assembly desirable. The difference in the capacities ling from waste material is of crucial recovery and separation of
meters was studied and it is shown that of two-dimensional separation for C H and C H is 23.4 cm per gm importance. Pd is also used in the auto- furfural (F) and its by-products Membranes-based sepa-
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2.0-3.0 µm particles can be obtained, membranes for H purifi cation for HOF-NBDA and the uptake ratio motive industry and in electronics. ration
which is smaller than the market product 2 is 136%. This work shows that the Design principle of solid-sorbents [F is becoming a platform chemical and
and with “shorter and thicker” high end J. Wang et al have worked on the energy polymer grade C H can be made from for efficient recovery of Pd from this column has covered many papers Hydrophobic membrane for
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products. Further accumulation of the efficient membrane-based separation C H /C H (1:99 v/v) mixture with waste sources is discussed. Porous on F and its derivatives. F recovery is of water recovery from humidity
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using two-dimen- high productivity of 29.2 l per kg at Organic Polymers (POPs) appear to be crucial importance from the hydrolysates.] by membrane condenser
sional (2D) molecular 25°C. [Angew. Chem. Intl. Ed.; DOI: very promising due to their tuneable J. Kochermann and M. Klemm have
sieving membranes, 10.1002/anie.202305041]. chemical functionality, stability and discussed this subject as F can undergo Y. Huang et al have deployed two hydro-
which feature unique porosity. The use of captured Pd with undesirable reaction if not quickly phobic porous ethylene-chlorotrifl uoro-
nanopores and low Effect of H -enriched solvents the polymer network as heterogeneous removed. The current processes have ethylene (ECTFE) membranes quenched
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transport resistance on the extraction of phytochemi- catalyst for cross-coupling reactions in water and air and further modifi ed
for H purification. cals in propolis (P) is discussed. The use of MOFs and high energy consumption, which is not to improve their condensation perfor-
sustainable. [Mineral acids are used as
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This is a highly perme- COFs is also covered. POPs are dis- catalysts in making F.] In Europe, the mance. The quality of condensate water
able system with low B. Yurt have referred to P as one of cussed at length and their structures demand for F is expected to increase thus improved. [Ind. Eng. Chem. Res.,
energy consumption. most important bee products, which are provided. In view of the criticality from 50,000-tpa today to 200,000-tpa 2023; DOI: 10.1021/acs.iecr.3C00261].
Here high-aspect- cannot be used in its raw form. Ethanol of the availability of Pd its recovery by 2030. Reactive extraction in biphasic
ratio zeolite nanosheets is widely used, but some are affected from aqueous solutions becomes very system has been considered, in addition to Two-dimensional LDH films
were deployed. A by this product. Thus, non-alcohol sol- important. [Chimia, 2023, 77, No.3. monophasic solvent mixture. This papers templating for controlled
swollen layered zeo- vent-based process was explored and 122-126]. discusses in detail reactive distillation via preparation and performance
lite, ECNO-Z8 with H -enriched solvents are promising. vapour-releasing batch reactor equipped enhancement of polyamide
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SZR topology and [ACS Omega, 2023; DOI: 10.1021/ with a condenser. F forms heterogeneous nanofi ltration (NF) membranes
eight-member ring acsomega.3C01673]. azeotrope with water, which facilitates
(8-HR, 3.0 Å x4.8 Å ) A Metal Organic-Frameworks recovery. Hydrolysates were treated at B. Li et al have worked on the use
pores normal to the (MOFs) – based multi-functional 170-210°C by using a steam releasing of layered double hydroxides (LDH)
nanosheets was used. cargo vehicle for reactive-gas batch reactor and F yield is 83 mol %. intermediate layer to control the inter-
It is fascinating to see delivery and catalysis facial polymerisation between trimesoyl
H selectivity up to The main side products in the condensate chloride (TMC) and piperazine (PIP)
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130 from natural gas. P. Kitti Khunnatham et al have are acetic and formic acid and no sugars for the preparation of polyamide mem-
[Angew. Chem. Intl. reported that MOFs can act as a or humins could be detected in the con- branes. A series of membranes with
Ed., DOI: 10.1002/ food truck to adsorb, store, and de- densate. Non-volatile substances such as controllable thickness from 10 to 50 nm
anie.202304734]. liver toxic gases to organic reaction. levulinic acid and 5-hydroxymethylfur and tuneable crosslinking degree were
174 Chemical Weekly October 24, 2023 Chemical Weekly October 24, 2023 175
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