Category: esters-buliding-blocks

Jankovic, Bojan published the artcileCharacterization analysis of Poplar fluff pyrolysis products. Multi-component kinetic study, Application of Benzyl acetate, the main research area is Poplar fluff pyrolysis thermal conversion structural property.

This paper describes the pyrolysis of Poplar fluff (from Populus alba) using online apparatus, and carbonization process at 850 °C using the fixed bed reactor. Characteristics of pyrolysis products were examined Elemental and chem. analyses were shown that Poplar fluff has higher energy content characterized by increased content of fibrous structure (particularly cellulose). Independent parallel reactions model very well describes devolatilization process. It was found that increased amount of extractives can significantly affect on increased release of light gaseous products, but declining hydrocarbons, mostly the alkanes. Liquid product is mainly composed of phenolics, aldehydes, acids, esters and ketones. The carbonization process produces the great abundance of polycyclic aromatic hydrocarbons (PAH’s), where naphthalene is the most abundant. Mechanism for PAH’s formation was suggested. This study represents the first step in a much wider and more comprehensive way in thermal conversion processes of this type of fuel.

Fuel published new progress about Biomass. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Application of Benzyl acetate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Jori, Popat K. published the artcileEfficient Synthesis of γ-Valerolactone-A Potential Fuel from Biomass Derived Levulinic Acid Using Catalytic Transfer Hydrogenation Over Hf@CCSO3H Catalyst, Category: esters-buliding-blocks, the main research area is levulinic acid transfer hydrogenation valerolactone hafnium carbonaceous catalyst.

A new hafnium based carbonaceous catalyst (Hf@CCSO3H) was prepared by simultaneous carbonization and sulfonation of readily available glucose, followed by incorporation of hafnium metal on the surface of catalyst. The catalyst was well characterized using FT-IR, PXRD, EDX, SEM, 13C CPNMR, XPS and BET anal. The catalytic activity of Hf@CCSO3H was evaluated for synthesis of γ-valerolactone-a potential fuel and green solvent. γ-Valerolactone was synthesized from biomass derived levulinic acid by catalytic transfer hydrogenation using 150 wt% of catalyst at 200°C for 24 h in isopropanol solvent as a hydrogen donor. 100% conversion of levulinic acid was achieved with an excellent yield of 96% with more than 99% selectivity of γ-valerolactone as evident from GC anal. The method developed is simple, efficient and economical.

Catalysis Letters published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Garg, Nitish K. published the artcileEfficient Conversion of Biomass Derived Levulinic Acid to γ-Valerolactone Using Hydrosilylation, Computed Properties of 539-88-8, the main research area is efficient conversion biomass derived levulinic acid Valerolactone hydrosilylation.

Converting biomass into value-added chems. is of significant interest and we report an efficient hydrosilylation to convert levulinic acid to γ-valerolactone using cost-effective silanes such as PMHS and TMDS with B(C6F5)3 as catalyst. This metal free methodol. works at room temperature reaching TONs and TOFs up to 16000 and 2000 h-1. Insights into the reaction mechanism are reported.

European Journal of Organic Chemistry published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Computed Properties of 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Nowicki, Janusz published the artcileEthanolysis of selected catalysis by functionalized acidic ionic liquids: an unexpected effect of ILs structural functionalization on selectivity phenomena, Category: esters-buliding-blocks, the main research area is dehydration catalyst monosaccharide glucose fructose; biomass ionic liquid ethanolysis catalysis ethylxyloside hydroxymethyfurfural HMF EMF.

A series of functionalized hydrogen sulfate imidazolium ILs were synthesized and applied as catalysts in the reaction of glucose, xylose and fructose with ethanol. In this research, an unexpected selectivity phenomenon was observed It showed that in this reaction functionalized ILs should be considered as a special type of catalyst. Functionalization of alkyl imidazolium ILs, especially the addition of electroneg. OH groups, causes a clear and unexpected effect manifested via visible changes in the selectivity of the reaction studied. In the case of fructose, an increase in the number of OH groups affects an increase in the selectivity towards Et levulinate from 14.2% for [bmim]HSO4 to 20.1% for [glymim]HSO4 with an addnl. increase in selectivity to 5-hydroxymethyfurfural. In turn, for xylose, the introduction of OH groups to the alkyl chain was manifested by a decrease in selectivity to furfural as its Et acetal and an increase in selectivity to ethylxylosides.

New Journal of Chemistry published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Jorge, Erlen Y. C. published the artcileSulfonated dendritic mesoporous silica nanospheres: a metal-free Lewis acid catalyst for the upgrading of carbohydrates, Formula: C7H12O3, the main research area is sulfonated mesoporous silica nanosphere catalyst support sugar conversion intermediate.

Lignocellulosic biomass is becoming a viable alternative or complementary source for obtaining petroleum-derived products such as fuels, polymers and fine chems., among others. Nevertheless, the successful upgrading of lignocellulosics requires the design of efficient and robust catalysts, where sulfonated mesoporous SiO2 materials may be an ideal choice for exploration. Herein, the authors have conducted the upgrading of several mono-, di- and polysaccharides such as xylose, fructose, glucose, sucrose and cellulose to valuable platform chems. using a novel catalyst comprising sulfonated dendritic mesoporous SiO2 nanospheres. Addnl., a thorough comparative study was conducted encompassing arrays of sulfonated silicas as catalysts with the aim of relating their activities and appreciating the features which could be responsible for their activity.

Green Chemistry published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Formula: C7H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Tukacs, Jozsef M. published the artcileContinuous flow hydrogenation of methyl and ethyl levulinate: an alternative route to γ-valerolactone production, Quality Control of 539-88-8, the main research area is methyl ethyl levulinate valerolactone continuous flow hydrogenation; flow chemistry; heterogeneous catalysis; hydrogenation; γ-valerolactone.

Heterogeneous continuous transformation of Me levulinate (ML) and Et levulinate (EL) to γ-valerolactone (GVL), as a promising C5-platform mol. was studied at 100°C. It was proved that the H-Cube continuous hydrogenation system equipped with 5% Ru/C CatCart is suitable for the reduction of both levulinate esters. While excellent conversion rates (greater than 99.9%) of ML and EL could be achieved in water and corresponding alcs., the selectivities of GVL were primarily affected by the solvent used. In water, 100% conversion and ca 50% selectivity that represent ca 0.45 molGVL g-1metalh-1 productivity towards GVL, were obtained under 100 bar of total system pressure. The application of alcs. as a solvent, which maintained high conversion rates up to 1 mL min-1 flow rate, resulted in lower productivities (less than 0.2 molGVL g-1metal h-1) of GVL. Therefore, from a synthesis point of view, the corresponding 4- hydroxyvalerate esters could be obtained even at a higher reaction rate. The addition of sulfonated triphenylphosphine ligand (TPPTS) allowed reduction of the system pressure and resulted in the higher selectivity towards GVL.

Royal Society Open Science published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Quality Control of 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Shende, Vaishali S. published the artcileRoom-Temperature Asymmetric Transfer Hydrogenation of Biomass-Derived Levulinic Acid to Optically Pure γ-Valerolactone Using a Ruthenium Catalyst, COA of Formula: C7H12O3, the main research area is asym transfer hydrogenation biomass levulinic acid valerolactone ruthenium catalyst.

This study presents a first report on ruthenium-catalyzed asym. transfer hydrogenation (ATH) of levulinic acid (LA) to chiral γ-valerolactone (GVL). ATH of LA has been explored with Noyori’s chiral catalyst (Ru-TsDPEN) in methanol solvent. Efficacy of ATH reaction of LA was investigated under different reactions conditions such as temperature, catalyst, and hydrogen donor concentration The effect of various organic tertiary bases along with formic acid (FA) as a hydrogen donor was studied, and N-methylpiperidine with FA (1:1 molar ratio) was revealed as an efficient hydrogen donor for ATH of LA to GVL furnishing chiral GVL with complete conversion and 93% enantiomeric excess (ee). This operationally simple and mild ATH protocol was tested for practical applicability of ATH of LA obtained from biomass waste (rice husk and wheat straw) and furnished chiral GVL with 82% ee.

ACS Omega published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, COA of Formula: C7H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Karnjanakom, Surachai published the artcileDirect conversion of sugar into ethyl levulinate catalyzed by selective heterogeneous acid under co-solvent system, Formula: C7H12O3, the main research area is sugar ethyl levulinate catalyzed acid solvent system.

The direct synthesis of Et levulinate (EL) from sucrose was investigated under co-solvent of THF/ethanol over stable/active heterogeneous acid catalyst. Several Lewis acid-metal oxides were doped onto Bronsted acid-sulfonated carbon (SC) and the results found that Zn-SC exhibited highest activity for production of EL from sucrose conversion of 100% with a selectivity of 72.1%. The catalytic mechanism for conversion of sucrose into EL and other products was investigated through significant effects such as catalyst type, co-solvent and ultrasonic application. The catalyst reusability test exhibited high stability for five cycles and then dramatically decreased without any regeneration process.

Catalysis Communications published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Formula: C7H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Nikitin, Eugene D. published the artcileCritical temperatures and pressures, heat capacities, and thermal diffusivities of levulinic acid and four n-alkyl levulinates, Synthetic Route of 539-88-8, the main research area is alkyl levulinate levulinic acid critical temperature pressure heat capacity.

The critical temperatures, pressures, heat capacities, and thermal diffusivities of levulinic acid and Me, Et, Pr, and Bu levulinates have been measured. Exptl. critical constants of levulinic acid and alkyl levulinates have been compared with those calculated using the group contribution methods of Wilson/Jasperson, Lydersen, Constantinou/Gani, and Marrero/Gani. The temperature dependencies of heat capacities and thermal diffusivities have been approximated by a third-order and a first-order polynomial, resp. The coefficients of these polynomials have been given. Exptl. heat capacities have been compared with those estimated by the methods of Kolska et al. and Dvorkin et al. Using the exptl. data, the thermal conductivities of alkyl levulinates have been calculated These data have been compared to those calculated by the methods of Latini et al. and Sastri.

Journal of Chemical Thermodynamics published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Synthetic Route of 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Ji, Ying published the artcileSynthesis of Silico-Phospho-Aluminum Nanosheets by Adding Amino Acid and its Catalysis in the Conversion of Furfuryl Alcohol to Fuel Additives, Safety of Ethyl 4-oxopentanoate, the main research area is silicophospho aluminum furfuryl alc amino acid valorization; amino acids; diethyl ether; ethyl levulinate; furfuryl alcohol; nanosheets.

Self-assembled spheres of silico-phospho-aluminum nanosheets were synthesized with the addition of L-arginine and evaluated as catalysts for the valorization of furfuryl alc. to fuel additives. Adding the amino acid, a bio-derived additive, contributed to higher external sp. surface area and more active sites, featuring a simple, environmentally friendly, and feasible strategy to regulate the growth of nanosheets. Herein, in the reaction of furfuryl alc. with ethanol, the performance of silico-phospho-aluminum nanosheets was significantly improved compared with typical silicon phosphorus aluminum catalyst SAPO-34. The yield of Et levulinate with the use of silico-phospho-aluminum nanosheets was 7.8 times higher than for SAPO-34, and meanwhile the amount of undesirable byproduct di-Et ether was decreased by two orders of magnitude and negligibly produced compared with SAPO-34. Moreover, replacing part of aluminum isopropoxide with aluminum sulfate as aluminum source could introduce sulfate in situ in the process of catalyst synthesis and increase the amount of acid sites on the catalyst.

ChemSusChem published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Safety of Ethyl 4-oxopentanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics