The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform
Didier Combes - One of the best experts on this subject based on the ideXlab platform.
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Enzymatic Synthesis of Thioesters in Non‐conventional Solvents
Journal of Chemical Technology & Biotechnology, 1997Co-Authors: Mylène Caussette, Alain Marty, Didier CombesAbstract:The feasibility of enzymatic thioesterification between oleic acid and Butanethiol in n-hexane, with the immobilised lipase (Lipozyme) from Mucor miehei, has been demonstrated. The immobilised enzyme quantity (100 mg), temperature (40°C), pH range (6–9) and water content (10%) were studied and their optimum values were determined. A preliminary kinetic study indicated a low Butanethiol affinity for the enzyme (Km = 1·85 mol dm−3). Even when Butanethiol was used without solvent, no substrate inhibition was observed. The possibility of carrying out this reaction in a natural solvent, supercritical carbon dioxide (SCCO2), was successfully verified. After 8 h reaction, a conversion yield of oleic acid of about 33% was obtained. © 1997 SCI.
Yu-chang Chen - One of the best experts on this subject based on the ideXlab platform.
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Single-molecule refrigerators: Substitution and gate effects
Applied Physics Letters, 2011Co-Authors: Yu-shen Liu, Yu-chang ChenAbstract:Using a first-principles approach, we investigate the quantum cooling effects in single-molecule junctions. In comparison with the unsubstituted Butanethiol single-molecule junction as a refrigerator, the amino-substituted Butanethiol single-molecule junction shows significant enhancement in the coefficient of performance (COP). The enhancement is attributed to the appearance of new states in the neighborhood of chemical potentials due to amino substitution. The COP of Butanethiol refrigerator can be improved further by the gate voltages.
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Alkanethiol-based single-molecule transistors
Applied Physics Letters, 2008Co-Authors: Diu Nghiem, Yu-chang ChenAbstract:We have investigated the transport properties of alkanethiol molecules in the two-terminal and three-terminal junctions by using first-principles approaches. We observe that states around the Fermi levels are introduced in the amino-substituted Butanethiol junction. It leads to a sharp increase in the current, which is credited to the resonant tunneling. The current-voltage characteristics suggest that the amino-substituted Butanethiol molecular junction may be a promising candidate for field-effect transistors.
Javeed A. Awan - One of the best experts on this subject based on the ideXlab platform.
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New measurements and modeling of electrical conductivity and pH of n- propanethiol and n-Butanethiol in N-methyldiethanolamine + piperazine (MDEA- Piperazine) Aqueous solution at 306 K and 1atm
2016Co-Authors: M. Yaqoob, Christophe Coquelet, Gull Zaib, Mudasir Hussain, Safwan Ali, Javeed A. AwanAbstract:In this work new measurements of electrical conductivity (µS.cm-1) and pH of n-propanethiol and n-Butanethiol in N-methyldiethanolamine (MDEA) + piperazine aqueous solution at 306 K and atmospheric pressure. The experiments were performed at three 2.5 ml, 3.0 ml and 5.0 ml volumes of n-propanethiol and n-Butanethiol in 45 wt % and 18 wt % MDEA aqueous solutions. The piperazine concentration has been kept constant by 4 wt % in all the experiments. The changes in electrical conductivity (EC) with time have been related to the change in concentration of ionic species and change of pH has been related to the acid-base neutralization reaction.
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new measurements and modeling of electrical conductivity and ph of n propanethiol and n Butanethiol in n methyldiethanolamine piperazine mdea piperazine aqueous solution at 306 k and 1atm
CHISA 2016 PRAGUE, 2016Co-Authors: M. Yaqoob, Christophe Coquelet, Gull Zaib, Mudasir Hussain, Safwan Ali, Javeed A. AwanAbstract:In this work new measurements of electrical conductivity (µS.cm-1) and pH of n-propanethiol and n-Butanethiol in N-methyldiethanolamine (MDEA) + piperazine aqueous solution at 306 K and atmospheric pressure. The experiments were performed at three 2.5 ml, 3.0 ml and 5.0 ml volumes of n-propanethiol and n-Butanethiol in 45 wt % and 18 wt % MDEA aqueous solutions. The piperazine concentration has been kept constant by 4 wt % in all the experiments. The changes in electrical conductivity (EC) with time have been related to the change in concentration of ionic species and change of pH has been related to the acid-base neutralization reaction.
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phase equilibrium measurements and modeling of 1 propanethiol 1 Butanethiol ch4 in methane ternary system at 303 336 and 368 k and pressure up to 9 mpa
Journal of Chemical & Engineering Data, 2016Co-Authors: Javeed A. Awan, Christophe Coquelet, Ioannis Tsivintzelis, Georgios M. KontogeorgisAbstract:New vapor–liquid equilibrium (VLE) data for 1-propanethiol + 1-Butanethiol + CH4 ternary system is reported. Measurements were performed at three different temperatures (303, 336, and 368 K), and the pressure ranged from 1 to 9 MPa. The total system pressure was maintained by CH4. The inlet mole fraction of 1-propanethiol (x = 5.43 × 10–1) and 1-Butanethiol (x = 4.56 × 10–1) in the liquid phase were same in all experiments. A static analytic method was used for performing phase equilibrium measurements. The new VLE data have been modeled successfully with cubic-plus-association (CPA) equation of state.
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Phase Equilibrium Measurements and Modeling of 1-propanethiol + 1-Butanethiol + CH4 in Methane + Water Ternary Systems at 303, 336, and 365 K and Pressure Up to 9 MPa
Journal of Chemical and Engineering Data, 2016Co-Authors: Javeed A. Awan, Christophe Coquelet, Ioannis Tsivintzelis, Georgios M. KontogeorgisAbstract:New vapor-liquid equilibrium (VLE) data for 1-propanethiol + 1-Butanethiol + CH4 ternary system is reported. Measurements were performed at three different temperatures (303, 336 and 368 K), while the pressure was ranged from1 to 9 MPa. The total system pressure was maintained by CH4. The inlet mole fraction of 1-propanethiol (x = 5.43 10-1) and 1n-Butanethiol (x = 4.56 10-1) in the liquid phase were same in all experiments. A static analytic method was used for performing phase equilibrium measurements. The new VLE data have been modeled successfully with Cubic-Plus-Association (CPA) EoS.
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Phase Equilibrium Measurements and Modeling of 1-Propanethiol +1-Butanethiol + CH4 in Methane Ternary System at 303, 336, and 368 K and Pressure Up to 9 MPa
Journal of Chemical & Engineering Data, 2015Co-Authors: Javeed A. Awan, Christophe Coquelet, Ioannis Tsivintzelis, Georgios M. KontogeorgisAbstract:New vapor–liquid equilibrium (VLE) data for 1-propanethiol + 1-Butanethiol + CH4 ternary system is reported. Measurements were performed at three different temperatures (303, 336, and 368 K), and the pressure ranged from 1 to 9 MPa. The total system pressure was maintained by CH4. The inlet mole fraction of 1-propanethiol (x = 5.43 × 10–1) and 1-Butanethiol (x = 4.56 × 10–1) in the liquid phase were same in all experiments. A static analytic method was used for performing phase equilibrium measurements. The new VLE data have been modeled successfully with cubic-plus-association (CPA) equation of state.
Ryuichi Shirai - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of 6-amylsalicylic acid from 3-anisaldehyde: Conversion of phthalide to thioththalide by aluminum halide-Butanethiol
Tetrahedron Letters, 1998Co-Authors: Asuka Nishikawa, Yuichi Hashimoto, Ryuichi ShiraiAbstract:Abstract The Lewis acid-promoted reaction of 3-butyl-7-methoxyphthalide with Butanethiol gave the thiophthalide, which was converted to 6-amylsalicylic acid by alkaline hydrolysis and successive desulfurization by Raney Ni.
William R. Parrish - One of the best experts on this subject based on the ideXlab platform.
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excess properties for 1 Butanethiol heptane cyclohexane benzene and toluene 2 excess molar enthalpies at 283 15 298 15 and 333 15 k
Journal of Chemical & Engineering Data, 1995Co-Authors: Gregory C. Allred, J.w. Beets, William R. ParrishAbstract:Thiols (mercaptans) are industrially important because of their occurrence in petroleum, their use as chemical intermediates, and their involvement in environmental problems. Excess molar enthalpies of binary mixtures of 1-Butanethiol + heptane, + cyclohexane, + benzene, or + toluene have been determined at 283.15, 298.15, 333.15 K with a flow mixing calorimeter, and at 283.15 and 298.15 K with a titration calorimeter. Partial molar enthalpies have been derived from the titration calorimetric results. Where results were obtained by both methods, they were combined to obtain the best estimate of excess enthalpy for all compositions. Equimolar excess enthalpies for 1-Butanethiol + heptane or + cyclohexane are endothermic and are comparable to the equimolar excess enthalpies for 1-butanol + heptane or + cyclohexane. Excess enthalpies of 1-Butanethiol + alkane systems, which is contrary to the trend observed in 1-butanol + aromatic systems compared to 1-butanol + alkane systems. The excess enthalpy of 1-Butanethiol + toluene is weakly exothermic.
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Excess properties for 1-Butanethiol + heptane, + cyclohexane, + benzene, and + toluene. 2. Excess molar enthalpies at 283.15, 298.15, and 333.15 K
Journal of Chemical & Engineering Data, 1995Co-Authors: Gregory C. Allred, J.w. Beets, William R. ParrishAbstract:Thiols (mercaptans) are industrially important because of their occurrence in petroleum, their use as chemical intermediates, and their involvement in environmental problems. Excess molar enthalpies of binary mixtures of 1-Butanethiol + heptane, + cyclohexane, + benzene, or + toluene have been determined at 283.15, 298.15, 333.15 K with a flow mixing calorimeter, and at 283.15 and 298.15 K with a titration calorimeter. Partial molar enthalpies have been derived from the titration calorimetric results. Where results were obtained by both methods, they were combined to obtain the best estimate of excess enthalpy for all compositions. Equimolar excess enthalpies for 1-Butanethiol + heptane or + cyclohexane are endothermic and are comparable to the equimolar excess enthalpies for 1-butanol + heptane or + cyclohexane. Excess enthalpies of 1-Butanethiol + alkane systems, which is contrary to the trend observed in 1-butanol + aromatic systems compared to 1-butanol + alkane systems. The excess enthalpy of 1-Butanethiol + toluene is weakly exothermic.
