Month: December 2022

Zhou, Shenghui published the artcileZirconium-lignosulfonate polyphenolic polymer for highly efficient hydrogen transfer of biomass-derived oxygenates under mild conditions, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is zirconium lignosulfonate polyphenolic polymer hydrogen transfer biomass oxygenate mild.

Both value-added utilization of low-rank renewable feedstocks to prepare catalytic materials and selective transformation of bioderived aldehydes are very attractive topics. Herein, lignosulfonate, a waste byproduct from the paper industry, was simply assembled with ZrCl4 under non-toxic hydrothermal conditions for scalable preparation of Zr-containing polyphenolic biopolymer catalysts (Zr-LS). Systematic characterizations indicated that the strong coordination between Zr4+ and phenolic hydroxyl groups in lignosulfonate led to the formation of strong Lewis acid-base couple sites (Zr4+-O2-) and porous inorganic-organic framework structure (mesopores centered at 6.1 nm), while the inherent sulfonic groups in lignosulfonate could serve as Bronsted acidic sites. The cooperative role of these versatile acid-base sites in Zr-LS afforded excellent catalytic performance for Meerwein-Ponndorf-Verley (MPV) reaction of a broad range of bioderived platform chems. under mild conditions (80 °C), especially of furfural (FF) to furfuryl alc. (FA), in quant. yields (96%) with high FA formation rate of 9600 μmol g-1 h-1 and TOF of 4.37 h-1. Kinetic studies revealed that the activation energy of the MPV reduction of FF was as low as 52.25 kJ/mol, accounting for the high reaction rate. Isotopic labeling experiments demonstrated direct hydrogen transfer from the α-C of 2-PrOH to the α-C of FF on acid-base sites was the rate-determining step. Moreover, Zr-LS showed good recyclability for at least seven reaction cycles.

Applied Catalysis, B: Environmental published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Recommanded Product: Ethyl 4-oxopentanoate.

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

Zainol, Muzakkir Mohammad published the artcileEthyl levulinate synthesis from biomass derivative chemicals using iron doped sulfonated carbon cryogel catalyst, Category: esters-buliding-blocks, the main research area is biomass iron sulfonated carbon cryogel catalyst ethyl levulinate.

Biomass-derived intermediate chems., such as furfuryl alc. (FA) and levulinic acid (LA) are feeds for ethanolysis reaction to produce Et levulinate (EL). EL is a promising chem. that can be used as a biofuel additive and precursor for chem. synthesis, such as γ-valerolactone. The present study conducted the ethanolysis of FA and LA using modified carbon cryogel as heterogeneous catalysts for improving the EL yield. The carbon cryogel (UCC) precursor was produced from urea and furfural, and modified via sulfonation. Iron (Fe) doping was then conducted to improve the surface chem. of the catalyst. The catalytic activity of sulfonated carbon cryogel (UCC-S) was evaluated for LA ethanolysis, and the UCC-S-Fe prepared from the incorporation of Fe on UCC-S was utilized to catalyze FA ethanolysis. The effects of reaction parameters (i.e., time, molar ratio of ethanol to feed, catalyst loading, and reaction temperature) were significant on the catalytic performance. High EL yield of 95.8 mol% and 95.4 mol% were obtained from the ethanolysis of LA and FA, resp. The performance of ethanolysis of carbohydrates and various biomass samples was evaluated to determine the EL yield using UCC-S-Fe. Both UCC-S and UCC-S-Fe were characterised using FTIR, XRD, TGA, NH3-TPD, BET, and SEM-EDX. The modification of UCC via sulfonation and Fe-doping improved the catalyst properties, and UCC-S-Fe demonstrated the potential to enhance biomass conversion to EL.

Journal of Cleaner Production published new progress about Adsorption. 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

Nath, Biswajit published the artcileHighly efficient renewable heterogeneous base catalyst derived from waste Sesamum indicum plant for synthesis of biodiesel, COA of Formula: C23H46O2, the main research area is Sesamum biodiesel synthesis heterogeneous catalyst.

Waste Sesamum indicum plant derived heterogeneous catalyst was utilized for the first time for biodiesel synthesis from sunflower oil. The derived catalyst was characterized by using Powder XRD, FT-IR, BET, TGA, XRF, AAS, XPS, SEM-EDX and TEM, and the characterization revealed the presence of Na, K, Ca, Mg, Fe, Mn, Zn, Si, Sr and Cl with high percentage of K (29.64 wt %) and Ca (33.80 wt %) as oxides and carbonates. The catalyst with a moderate surface area of 3.66 m2 g-1 exhibited excellent catalytic activity producing a yield of 98.9% biodiesel under the optimized conditions of 12:1 methanol to oil molar ratio and catalyst loading of 7 wt % at the reaction temperature of 65°C in a short reaction time of only 40 min. The catalyst could be reused up to the 3rd cycle of reaction with the yield of 94.2% biodiesel. The characterization of biodiesel was done by using FT-IR, NMR, and GC-MS techniques. The fuel property of produced biodiesel meets the prescribed limits of international standard The prepared catalyst is easy to handle, reusable, and found to be highly efficient green catalyst that could help in reduction of biodiesel cost. Thus, the catalyst can be recommended as a potential candidate for cost-effective biodiesel production at a large scale.

Renewable Energy published new progress about Adsorption. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, COA of Formula: C23H46O2.

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

Yoon, Seung Kyun published the artcileDevelopment of blood compatible composite using MPC copolymer and polyolefin for Non-PVC blood bag application, HPLC of Formula: 142-90-5, the main research area is blood bag compatible composite MPC copolymer polyolefin.

Polyolefin is a good candidate for a blood bag material alternative to the poly (vinyl chloride) (PVC) blood bag that contains di-2-ethylhexyl phthalate (DEHP). However, polyolefin readily adsorbs some plasma proteins and platelets. To prevent these undesired adsorption, 2-methacryloyloxyethyl phosphorylcholine (MPC) – hydroxyethyl methacrylate (HEMA) – lauryl methacrylate (LMA) copolymers with varying monomer ratios were synthesized and used as blended material for additives to reduce platelet adsorption. Platelet adsorptive properties were reduced by blending MPC copolymers with polyolefin and confirmed by the platelet adhesion test and the activated partial thromboplastin time (APTT) test.

Macromolecular Research published new progress about Adsorption. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, HPLC of Formula: 142-90-5.

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

Wang, Liwen published the artcileSiO2 supported Ni-In intermetallic compounds: Efficient for selective hydrogenation of fatty acid methyl esters to fatty alcohols, SDS of cas: 111-11-5, the main research area is SiO2 nickel indium hydrogenation fatty acid methyl ester alc.

Ni/SiO2 and SiO2 supported Ni2In, NiIn and Ni2In3 intermetallic compounds (IMCs) were prepared by the sol-gel method and tested for the selective hydrogenation of Me esters to fatty alcs. It was found that the Ni phyllosilicate formed during the sol-gel process leads to high Ni dispersion. In IMCs, the Ni atoms are homogeneously isolated by the In ones and the charge is transferred from In to Ni. In the selective hydrogenation, decarbonylation/decarboxylation dominatingly occur on Ni/SiO2, while SiO2 supported IMCs mainly give fatty alcs., and the yield of fatty alc. can reach above 94%. We suggest that it is the synergetic effect between Ni and In that facilitates the selective hydrogenation to yield fatty alcs. The catalyst stability was also investigated, and the catalyst deactivation is mainly ascribed to the carbonaceous deposit.

Applied Catalysis, B: Environmental published new progress about Adsorption. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, SDS of cas: 111-11-5.

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

Guo, Haixin published the artcileHydrogen gas-free processes for single-step preparation of transition-metal bifunctional catalysts and one-pot γ-valerolactone synthesis in supercritical CO2-ionic liquid systems, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is carbon transition metal bifunctional catalyst valerolactone one pot synthesis.

Hydrothermal carbonization of glucose (180 °C, 4 h) with 5-sulfosalicylic acid and nickel or copper sulfate afforded transition-metal (Ni/NiO, Cu/CuO) functional carbon (FC) catalysts in a single-step without hydrogen gas. Hydrogenation of levulinic acid to γ-valerolactone (GVL) in supercritical carbon dioxide (scCO2)-ionic liquid ([BMIM]Cl) systems with formic acid as H-donor source and Ni/NiO-FC catalysts gave 97% GVL yields (170 °C, 3 h). The Ni/NiO-FC catalysts (d = 50 to 200 nm) had well-dispersed Ni/NiO particles (<5 nm) with -SO3H, COOH and phenolic -OH functional groups; Ni/NiO-FC catalysts were more effective than Cu/CuO-FC catalysts. Ni/NiO-FC catalysts were active for conversion of substrates (Et levulinate, fructose, cellobiose or cellulose) to resp. products (GVL, 5-HMF, sugars). The role of scCO2 in the reaction system is one of improving mass transport and suppressing side-reactions via GVL product removal. Proposed methods for catalyst synthesis and substrate hydrogenation do not require hydrogen gas and are widely applicable to processing biomass. Journal of Supercritical Fluids published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Recommanded Product: Ethyl 4-oxopentanoate.

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

Naeem, Abdul published the artcileBiodiesel production from waste cooking oil employing natural bentonite supported heterogeneous catalyst: Waste to biodiesel, HPLC of Formula: 929-77-1, the main research area is bentonite biodiesel waste cooking oil heterogeneous catalyst.

This work describes the practicability of utilizing bentonite clay as a cheap and raw support for heterogeneous catalyst development. In the current research, ammonium persulfate (APS) impregnated bentonite heterogeneous catalyst was designed for the conversion of waste cooking oil to biodiesel. The fabricated catalyst was analyzed by various instrumental techniques (FTIR, TGA, BET, SEM, XRD, and EDX) to study its various physiochem. properties. It was identified that the clay supported heterogeneous catalyst executed an excellent activity for waste cooking oil conversion as providing maximum biodiesel yield of 93% at optimal reaction conditions (reaction temperature 75°C, oil/methanol molar ratio, 1:10; catalyst amount, 2.5 wt%; stirring rate, 600-rpm in 3.5 h reaction time). Gas chromatog. mass spectroscopy (GCMS) anal. confirms the successful conversion to biodiesel. Similarly, the various physiochem. characteristics of the synthesized biodiesel meet the international standard of American (ASTM6751) and European Union (EU-14214). Moreover, the designed acid catalyst showed catalytic activity for up to eight consecutive runs demonstrate its good reusability.

Korean Journal of Chemical Engineering published new progress about Adsorption. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, HPLC of Formula: 929-77-1.

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

Santana-Viera, Sergio published the artcileUV filters and UV stabilisers adsorbed in microplastic debris from beach sand, Computed Properties of 71617-10-2, the main research area is UV filter stabilizer microplastic beach sand adsorption pollution vector; Adsorption; Beach sand; Microplastics; Pollution vector; UV filters and stabilisers.

Microplastics (MPs) in oceans adsorb different types of pollutants, which can neg. impact the food chain. The extensive use of personal care products (PCPs) has led to their ubiquitous environmental presence, and their partition between plastic matrixes and surroundings is determined by their physico-chem. characteristics and environmental conditions. This work develops and applies a methodol. to determine 12 UV filters (UVFs) and UV stabilizers (UVSs) in MPs collected in beach sand. The analyzes were carried out by ultrasound-assisted extraction and ultrahigh-performance liquid chromatog. with tandem mass spectrometry detection. The validated procedure was applied to MPs samples taken in sand samples from 13 beaches on the Canary Islands (Spain). The results showed the presence of 10 UV filters and UV stabilizers at concentrations between 1 and 4031 ng·g-1, where octocrylene was the most frequently found. The target analytes were present in all the sampling beaches.

Marine Pollution Bulletin published new progress about Adsorption. 71617-10-2 belongs to class esters-buliding-blocks, name is Isopentyl 3-(4-methoxyphenyl)acrylate, and the molecular formula is C15H20O3, Computed Properties of 71617-10-2.

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

Goda, Mohamed Nady published the artcileMineral acid-activated sugarcane bagasse ash as solid acid catalyst for the liquid phase esterification of acetic acid with n-amyl, benzyl, and n-butyl alcohols, Formula: C9H10O2, the main research area is acetic acid amyl benzyl butyl alc sugarcane bagasse esterification.

Liquid phase esterification of carboxylic acids with alcs. is an important organic synthesis process in the petrochem. and fine chem. industries. These reactions required mineral acid catalysts, which are corrosive and difficult to be separated from the reaction mixture Therefore, the use of solid acid catalysts is economically viable, reusable, and environmentally amicable. In this study, sugarcane bagasse ash (SCBA) was impregnated with 1-10 weight% of sulfuric acid (H2SO4) or perchloric acid (HClO4) for the liquid-phase esterification of acetic acid with n-amyl, benzyl, and Bu alcs. under various reaction conditions. The catalysts were characterized using X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier-transform IR (FTIR), N2 sorption, and SEM. Their acidities were measured through the dehydration of iso-Pr alc. and pyridine adsorption FTIR. The effects of the acid activation of SCBA on its texture properties (such as surface area and the nature of the surface functional groups), acidity, and catalytic activity were studied in detail. FTIR of the pre-saturated catalysts with pyridine reflected the presence of Bronsted and Lewis acid sites. The concentrations of the acid sites were improved by increasing the percentages of acid loading. All the catalysts showed high catalytic activity with 100% selectivity to ester formation. The catalyst pretreated with H2SO4 showed the higher ester yields compared to that of treated with HClO4. The optimum reaction conditions were a reaction time of 2 h, an alc.-to-acid molar ratio of 1:3, and catalyst loading of 0.5 g. The highest yields of n-amyl acetate, benzyl acetate, and Bu acetate of 98, 90.8, and 70.5%, resp., were achieved over the SCBA pretreated with 10 weight% H2SO4 catalyst. The high catalytic performance of this catalyst is due to the high surface acidity generated by the inductive effect of the S=O bond.

Journal of Environmental Chemical Engineering published new progress about Adsorption. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Formula: C9H10O2.

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

Zhang, Rui published the artcileThermoresponsive hydrophobic copolymer grafted on agar microspheres for all-aqueous bioseparations, Computed Properties of 142-90-5, the main research area is agar microsphere thermoresponsive hydrophobic copolymer graft; N-isopropylacrylamide; agar microspheres; bioseparations; lauryl methacrylate; thermoresponsive polymers.

Agar microspheres were prepared by water-oil emulsification and cross-linked under alk. condition. The thermoresponsive hydrophobic copolymer, poly(N-isopropylacrylamide-co-lauryl methacrylate-co-acrylamide), was grafted on the agar microspheres via atom transfer radical polymerization The agar microspheres grafted with copolymers were characterized by light microphotog., elemental anal., Fourier transform IR spectroscopy, SEM, and XPS. The chain lengths and hydrophobic monomer ratio of the grafting linear polymer had significant effects on the hydrophobicity and adsorption capacity of agar microspheres at different temperatures The thermoresponsive microspheres were used for separation of proteins and showed binding and release behavior by change of temperatures without change in mobile phase composition Thus, we suggest thermoresponsive agar microspheres as an alternative separation media for all-aqueous biosepns.

Journal of Separation Science published new progress about Adsorption. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Computed Properties of 142-90-5.

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