Page 183 - CW E-Magazine (11-6-2024)

Special Report Special Report

Ethanol production from sugar- High astaxanthin (AX) pro- PHBA from biomass. (ACS Sustainable moisture content in raw L allows for the nanocomposites gave good mechanical solvent-free at low temperature for ester-
cane bagasse (SCB) duction by xanthophyllomyces Chem. Eng., 2024; DOI: 10.1021/acs- control of the pore structure. There are properties and even gas barrier proper- ifi cation. The process is semi-continuous
dendrorhous strain DW6 (XD) suschem.eng.3C08032). promising applications particularly in ties were comparable to those of butyl and allows simple and effi cient catalyst
B. Zabihi and M. Esfahanian have used from cane molasses using two- Chrome-free and chrome-less core insultation materials for structural rubber, with an oxygen permeability 13 recycling. The immobilised lipase cata-
PDMS membrane in a membrane biore- stage pH strategies tanning with waterborne epoxy insulated panels. (Green Chem., 2024; times lower than that of natural rubber. lyst was Novozym 435 and this has long
actor (MBR) (pervaporation technique). DOI: 10.1039/D3GC05123D). (ACS Sustainable Chem. Eng., 2024; term stability. (ACS Sustainable. Chem.
The membrane was poly (dimethyl- AX is a carotenoid which has a high polymers DOI: 10.1021/acssuschemeng.4C00423). Eng., 2024; DOI: 10.1021/acssusche-
siloxane) carbon nanotube/tetrazole. The antioxidant capacity and has applications [Chrome tanning leads to pollution due Advancements in sustainable L meng.3C06884).
optimum condition for acid hydrolysis in feed and human health. D. Zhou et al to the discharge of Cr in water; many modifi cation: waste to resource Bio-based polycarbonate from
is around 200°C and with acid concen- fi rst isolated XD. Fermentation para- improvements have been made to reduce diphenyl carbonate (DPC) and Fructose (F)-based surfactants
tration of 1.12%. The use of MBR gave meters like temperature, pH and C and N this problem or using alternatives.] C. Libretti et al have reviewed the litera- isosorbide (IS)
an increase of 104% over conventional sources were used for the yeast growth. V. Madhu et al have referred to leather ture with respect to recent advancements H-C. Lin et al have described a new
fermentation. The maximum ethanol A two-stage pH fermentation strategy as having intricate three-dimensional in the fi eld of L modifi cation, in parti- J. Shen et al have used metal-free cata- class of surfactants based on F, fatty acid
concentration was 165.7 gm per litre. (J. was developed to relieve the metabolic collagen fibre network. Goat skins cular methods for insertion of functional lysts and have identifi ed reactivity of methyl esters (FAME), and hydroxyl
Chem. Technol. Biotechnol., 2024; DOI: stress and allow AX accumulation. Sugar- have been subjected to chrome-free and groups are amines, epoxides, carboxylic endo-OH and exo-OH. DFT calculations propionitrile (Cyanoethanol, 3HP). This
10.1002/jctb.7592). cane molasses was used as the C and N chrome-less tanning using synthesised acids, esters, multiple bonds and –OH were done to discuss two potential re- process is scalable and is conducted at
source and 374 mg per litre of AX was epoxy polymers. Full characterisation groups. These authors chose the E-factor action pathways catalysed by tetraethyl ambient conditions. The products have
Effi cient recovery of itaconic produced with an astaxanthin content of has been done using FT-IR, NMR, as the green matrix to evaluate sustain- ammonium hydroxide (TEAH). Mecha- excellent surfactant properties with CMC
acid (IA) using weak and strong 9.0 mg per gm. This provides a basis for GPC, etc. Good results are reported with ably. Aspects of toxicity are discussed. nism is discussed which enable accurate and Kraft points comparable to current
anion exchange resins from large-scale production. (Green Chem., respect to many attributes. (ACS Sustain- (Green Chem., 2024; DOI: 10.1039/ predictions. (ACS Sustaibalble Chem. glucose-based surfactants. (Green Chem.,
aqueous solutions 2024; DOI: 10.1039/D3GC04918C). able Chem. Eng., 2024; DOI: 10.1021/ D3GC00745J). Eng, 2024; DOI: 10.1021/acssusche- 2024; DOI: 10.1039/D4GC00399C).
meng.4C00310).
Recovery of p-hydroxybenzoic acssuschemeng.3C04799).
C.E. Can et al have referred to IA as acid (PHBA) from Cu-catalysed Removal of bentazone (B) using Tailoring the molecular weight Regioselective Pd-catalysed
a remarkable raw material, which is alkaline H O pre-treatment of Eco-foaming L for innovative activated carbon from spent (MW) of isosorbide (IS)-derived aerobic oxidation of dextran (D)
2
obtained by fermentation and must be hybrid poplar rigid foam coffee grounds and its use as a bio-based binder
2
recovered with high effi ciency and se- polycarbonate via regulating in paperboard coatings
lectivity from complex aqueous-based S. Omolabake et al have referred to the Q. Yan et al have prepared rigid L foam B.C. daSilva Rocha et al have characte- the H-bond donor/acceptor
production media. Three types of weak presence of PHBA in some hardwood by a baking method using Kraft L as the rised the fresh spent coffee grounds via ability of task-specific ionic S. Maßmann et al have worked on the
basic anion exchangers (WBAEs) – biomass feedstocks as an ester attached sole source. This involved cold-pressing TGA, DSC, XRD, etc. Adsorption ex- liquid (IL) catalysts replacement of petrochemical-based
Amberlite IRA-67, Levatit MP-62, and to the polymeric lignin subunits. There Kraft L powder into a solid block, heating periments were carried out and activated builders in products such as paints and
Lewatit MP-64) – and a strong basic are two stages: alkaline pre-extraction the solid block to form L foam, and fi nally carbon was used to adsorb B. Toxicity W. Qian et al have used dimethyl car- lacquers with bio-based alternatives.
(AP) of the biomass and Cu-catalysed curing the L foam to obtain an open-cell, experiments for effl uent were done. (J. bonate (DMC) as a monomer with IS The use of oxidised D is referred with
and ILs as metal-free catalyst. The MW
alkaline hydrogen peroxide pre-treat- rigid foam. It is interesting that both the Chem. Technol. Biotechnol., 2024; DOI: of polycarbonates can be controlled as the linear D having a molecular weight
ment. From 100gm of biomass 0.5 gm of adsorbed water and water generated from 10.1002/jctb.7630). there are inherent differences in reacti- of 6-KDa being aerobically oxidised in
PHBA is obtained with a purity of 96% the dehydration of –OH groups in the L vity of endo-OH and exo-OH in IS. The water at the C-3 position of its glucose
after decolourisation and crystallisation. acted as the blowing agent in this baking Design and characterisation of highest MW was 57,200 gm per mole.
This work demonstrates the ability to get method. It seems that controlling the high gas barrier and fully bio- (Green Chem., 2024; DOI: 10.1039/
based poly(1,5-pentylene succi- D3GC03535B).
nate-co-itaconate-co-furanoate)
elastomers Biobased and biodegradable
high-performance lubricants units, catalysed by [(neocuproine)PdO-
anionic exchanger (SBAE) – Lewatit H. Lin et al have made the title elasto- Ac] (OTf) . The product Keto-D with
2
2
M-500 were tested. pH plays an mers by using transesterifi cation and A. Guntermann et al have reported different oxidation degree was studied
important role and highest effi ciencies melt polycondensation methods from process development for an easy, effi - using adipic dihydrazide as a crosslinker
were realised at pH 3 and pH 4 with the dimethyl furandicarboxylate, dimethyl cient, and sustainable synthesis of in combination with the commercial
NBAEs and SBAE, respectively. Lewatit succinate, dimethyl itaconate, and high-performance lubricants adopting petrochemical-based binder, JONCRY
MP-62 allowed the highest capacity of 1,5-pentanediol. Thus, four kind of lipase catalysis. The starting material (J). This work shows that part of J can
522.7 mg of IA per gm resin. (Ind. Eng. monomers were used to regulate the was a regioisomeric mixture of methyl be replaced maintaining the desired
Chem. Res., 2024; DOI: 10.1021/acs. glass transition temperature and suppress 9-/10-hydroxymethylstearate as an oleic performance. (Green Chem., 2024; DOI:
iecr.3C041518). crystallisation. Silica/above elastomer acid-derived raw material. The process is 10.1039/D3GC04204A).

182 Chemical Weekly June 11, 2024 Chemical Weekly June 11, 2024 183

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