Page 175 - CW E-Magazine (8-10-2024)

Special Report Special Report

Additionally encouraging fl ame retar- Highly effi cient and selective of polysaccharides is carried out and then Tungsten (W)-based catalysts
dancy is reported. Such resins have hydrogenation of furfural (F) enzymatic blend CellicCTech was used as for lignin (L) conversion
potential application in electronic to furfuryl alcohol (FA) and a biocatalyst for sugars production. The
packaging, construction, decoration, cyclopentanone (CP) simultaneous production of high added- Q. Qiang et al have reviewed W-based
and aerospace fi elds. (ACS Sus. Chem. value carotenoids and lipids was opti- catalysts and their synthesis is sum-
Eng., 2024: DOI: 10.1021/acssusche- X. Liao et al have reported the title con- mised. Carotenoids production of 120 marised. Catalytic conversion of L with
meng.4C01107). version using Cu-Ni bimetallic catalysts and 180 mg per litre and lipids production different catalysts are comprehensively
and the crucial role of CuNi alloys and of 5.2 and 3.5 gm per liter was realised.
Hydrogenolysis of furfuryl Cu species has been brought out. The (Catalysis Today, 2024, 442, 1Dec. 114911;
+
alcohol (FA): selectivity for lignin had desirable properties and was Effi cient separation of catechyl method of making the catalysts is given; DOI:10.1016/j.cattod.2024.114911).
1,2-pentanediol (PD) subjected to catalytic oxidation to give lignin (CL) from castor seed in situ/on-line DRIFTS was used and
a higher content of aromatic monomers. coats via molten salt hydrate Closer approach towards the
[This process merits attention]. (ACS preparation of cellulose and
Z. Wang et al have worked on Ce-doped Sus. Chem. Eng., 2024: DOI: 10.1021/ discussed. W carbides, sulphide, phos-
CuCeMgAl mixed metal oxide catalysts acssuschemeng.4C03566). W. Xia et al have worked on the title CL, microcrystalline cellulose from phide, W-acids and even bimetallic
and characterised then fully. Higher which is considered as an “ideal lignin” corn husks catalysts are covered. Future aspects
selectivity for PD is reported. (Reac- Green synthesis of stable lignin for valorisation. This is in the context are discussed. (Catalysis Today, 2024,
tion Chem. Eng., 2024: DOI: 10.1039/ nanoparticles (LNP) with of the excellent acid-resistant property P.T.H. Anh and D.M. Tai have worked on 442, 1 Dec. 114913; DOI: 10.1016/j.
D4RE00070F). of CL. Acidic molten salt hydrate of corn husks and a simple and eco-friendly cattod.2024.114913).
reversible swelling behaviour LiBr (LiBr-AMSH), with 60 wt% LiBr method has been developed. Corn husk
Glycol -based alkaline Deep and enhanced multi-functional solution with 60mM HCl was used at was treated with 12.5 wt% NaOH at a Microfl uidic synthesis of poly(-
-1
Eutectic Solvents (DESs) for features 150°C for 1 hour. 96% (wt) recovery DFT was done. The intermediate for solid/liquid ratio of 1:10 g ml , at 70°C lactic-co-glycolic) acid (PLGA)
is reported and this consisted of 99%
“Lignin-fi rst” dissolution from R. Grappa et al have referred to the benzodioxane (BD) structure. Based on CP is 4-hydroxy-2-cyclopentenone. for 90 min and this allowed the highest nanoparticles by an ultrasonic
yield of lignin and hemicellulose cleav-
coconut shells multi-functional LNPs which are raw material 12.8 wt% CL was realised. Under optimum conditions Cu Ni / age. Further bleaching of cellulose was microreactor
1
3
sustainable substitutes for conven- (Sepn. Purfn. Technol., 2024, 353, Part SiO gives 99.9% yield to FA at 60°C done with 10 wt% H O solution at 80°C
2
2
2
X. He et al have designed K CO -ethy- tional materials obtained from fossil B, 19 Jan. 2025, 128487; DOI: 10.1016/j. in isopropanol and 96.7% yield of CP for 90 min and this produced cellulose An emulsion-solvent evaporation tech-
2
3
lene glycol (EG) to realise the title fuels. These authors have proposed a seppur.2024.128487). at 140°C in water. (J. Catalysis, 2024, with a lightness value (L*) of about 87 nique was used to make monodispersed
objective. The previous DESs were straightforward, high-yield green route 436, August, 115603; DOI: 10.1016/ and cromaticity indexes α* = -1.85, b* = PLGA nanoparticles in the size range of
useful but compromised the effi cient for making LNPs. A hybrid approach is One-pot conversion of xylose jcat.2024.115603). 2.94 with high purity of about 91% and 20-300nm for the desired biomedical
recovery of hemicellulose. High delig- carried out based on the combination (X) to 1,2-pentanediol (PD) crystallinity of about 65%. application. Their method allow the
nifi cation to the extent of about 70% of antisolvent and ultrasonication (US) catalysed by an organic acid – Chemical and enzymatic hydro- range of 115-150 nm. Successful en-
was realised with good hemicellulose procedures. The LNPs have stability assisted Pt/NC in aq. phase lysis of waste wheat bran to For synthesising microcrystalline cellu- capsulation of a hydrophobic dye, Nile
retention of 70.2% at 130°C for 1 hour. and have potential for a wide range sugars and their simultaneous lose, the hydrolysis was investigated in Red, has also be demonstrated. (Reac-
It seems the cleavage of lignin-carbo- of applications. (ACS Sus. Chem. [Valorisation of X to value-added pro- biocatalytic conversion to valu- H SO solutions of different concentration tion Chem. Eng., 2024: DOI: 10.1039/
2
4
hydrate complex bonds is responsible Eng., 2024; DOI:10.1021/acssusche- ducts continues to attract attention and able carotenoids and lipids and duration. 30wt % H SO , 18 hr, 45°C, D4RE00107A). [A reference may also
2
4
for the above behaviour. The regenerated meng.4C03783). this column has covered related papers.] 1:10 S/L ratio and the average particle be made to the use of Tofacitinib-loaded
PLGA sustain release nanoparticles].
Q. Wang et al have referred to X being N.D. Fidio et al have reported the innova- size of 42.68 µm, crystallinity degree of (Ind. Eng. Chem. Res., 2024; DOI:
derived from hemicellulose as a good tive exploitation of waste defatted wheat about 62% and cellulose purity of 92.5% 10.1021/acs.iecr.4C01304).
feedstock to make value-added chemi- bran. These authors have developed a are reported. Experiments were also done
cals. Nitrogen doped carbon (NC) sup- cascade process where fi rst the micro- with 4N HCl. (Chem. Eng. Technology, Xylose (X) conversion to formic
ported Pt catalysts, assisted by organic wave-assisted FeCl -catalysed hydrolysis 2024: DOI: 10.1002/ceat.202300379). (FA) and lactic acid (L)
3
acid gives the desired results. The yield
of PD was at 49% by reacting 0.18699 X N. Sobus and M. Krol have used a natural
in 30 ml water at 200°C under H pres- origin clinoptilolite, with selected metal,
2
sure of 3 MPa in the presence of 0.1 g as catalysts for the title conversion of
of 2.5 Pt/NC600 catalyst and 0.1869 gm X, derived from hemicellulose. Fe, Cu
propionic acid co-catalyst. The mecha- and Co ions were introduced in the
nism is reported. The performance of the active centres of the clay using sonication
above catalyst was outstanding & was technique. The reaction was done at
recycled fi ve times. (Chem. Sus. Chem.: 220°C. FA yield of 91% was realised
DOI: 10.1002/CSS.202401109). (0-parent) and LA with a yield of 66%

174 Chemical Weekly October 8, 2024 Chemical Weekly October 8, 2024 175

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