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Dominique Richon - One of the best experts on this subject based on the ideXlab platform.
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Phase equilibria of binary clathrate hydrates of nitrogen+Cyclopentane/cyclohexane/methyl cyclohexane and ethane+Cyclopentane/cyclohexane/methyl cyclohexane
Chemical Engineering Science, 2011Co-Authors: Amir H. Mohammadi, Dominique RichonAbstract:Abstract In this communication, we first report hydrate dissociation conditions for the nitrogen+Cyclopentane, cyclohexane or methyl cyclohexane+water and ethane+Cyclopentane, cyclohexane or methyl cyclohexane+water systems at various temperatures. The experimental data were generated using an isochoric pressure-search method. The hydrate dissociation data for the aforementioned systems along with the hydrate dissociation data for the methane, carbon dioxide or hydrogen sulfide+Cyclopentane, cyclohexane or methyl cyclohexane+water systems collected from the literature are compared with the corresponding literature data in the absence of the aforementioned heavy hydrocarbons in order to study the hydrate promotion effects of Cyclopentane, cyclohexane or methyl cyclohexane. It is shown that these effects on ethane simple hydrate are not considerable unlike the corresponding effects on nitrogen, methane, carbon dioxide and hydrogen sulfide simple hydrates.
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phase equilibria of clathrate hydrates of methyl Cyclopentane methyl cyclohexane Cyclopentane or cyclohexane carbon dioxide
Chemical Engineering Science, 2009Co-Authors: Amir H. Mohammadi, Dominique RichonAbstract:In this work, experimental dissociation data for clathrate hydrates of methyl Cyclopentane, methyl cyclohexane, Cyclopentane or cyclohexane+carbon dioxide are reported at different temperatures. The experimental data were generated using an isochoric pressure-search method. The reliability of this method is examined by generating new dissociation data for clathrate hydrates of methyl Cyclopentane+methane and comparing them with the experimental data reported in the literature. The acceptable agreement demonstrates the reliability of the experimental method used in this work. The experimental data for all measured systems are finally compared with the corresponding literature data in the absence of the above mentioned cyclic compounds to identify their promotion effects.
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Phase equilibria of clathrate hydrates of methyl Cyclopentane, methyl cyclohexane, Cyclopentane or cyclohexane+carbon dioxide
Chemical Engineering Science, 2009Co-Authors: Amir H. Mohammadi, Dominique RichonAbstract:In this work, experimental dissociation data for clathrate hydrates of methyl Cyclopentane, methyl cyclohexane, Cyclopentane or cyclohexane+carbon dioxide are reported at different temperatures. The experimental data were generated using an isochoric pressure-search method. The reliability of this method is examined by generating new dissociation data for clathrate hydrates of methyl Cyclopentane+methane and comparing them with the experimental data reported in the literature. The acceptable agreement demonstrates the reliability of the experimental method used in this work. The experimental data for all measured systems are finally compared with the corresponding literature data in the absence of the above mentioned cyclic compounds to identify their promotion effects.
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Phase Equilibria of Clathrate Hydrates of Cyclopentane + Hydrogen Sulfide and Cyclopentane + Methane
Industrial & Engineering Chemistry Research, 2009Co-Authors: Amir H. Mohammadi, Dominique RichonAbstract:In this work, experimental hydrate dissociation data for the hydrogen sulfide + Cyclopentane + water and methane + Cyclopentane + water systems are reported in the temperature ranges of 295.4−310.0 K and 284.8−299.3 K, respectively. The experimental data were generated using an isochoric pressure-search method. The hydrate dissociation data for the methane + Cyclopentane + water system are compared with some selected experimental data from the literature, and the acceptable agreement demonstrates the reliability of the experimental method used in our work. The experimental data for both measured systems are finally compared with the corresponding literature data in the absence of Cyclopentane to study its hydrate promotion effects.
Zachary M Aman - One of the best experts on this subject based on the ideXlab platform.
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effect of kinetic hydrate inhibitor polyvinylcaprolactam on Cyclopentane hydrate cohesion forces and growth
Energy & Fuels, 2014Co-Authors: Reuben Wu, Zachary M Aman, Karen A Kozielski, Patrick G Hartley, Nobuo MaedaAbstract:The effect of Polyvinylcaprolactam (PVCap), a commonly used kinetic hydrate inhibitor (KHI), on the cohesion force between Cyclopentane hydrate particles was measured using a micromechanical force apparatus. The presence of PVCap in the aqueous bulk phase reduced the average hydrate cohesive force by 54% (from 1.49 to 0.69 mN/m). However, the cohesion forces did not vary significantly as a function of either the PVCap concentration (0.005–0.5 wt %) or the temperature (from 1.1 to 7.2 °C). When a layer of PVCap solution was applied to the surface of a pure Cyclopentane hydrate particle in a bulk liquid Cyclopentane phase, the interparticle cohesive force was reduced by 45% (from 4.3 to 2.4 mN/m). Hydrate growth on droplets of PVCap solutions was also studied by contacting a water droplet with a Cyclopentane hydrate particle in a bulk Cyclopentane phase. In cases where PVCap was absent, complete conversion of the water droplet to hydrate occurred within 30 s. However, when a water droplet of PVCap solution ...
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Measurements of cohesion hysteresis between Cyclopentane hydrates in liquid Cyclopentane
Energy & Fuels, 2013Co-Authors: Nobuo Maeda, Zachary M Aman, Karen A Kozielski, E. Dendy SloanAbstract:We measured cohesion hysteresis between Cyclopentane hydrate particles in liquid Cyclopentane in the temperature range from −8 to 6 °C. Cohesion hysteresis was small within scatter, and no clear temperature dependence was observed in the range studied. Too great of applied loads resulted in damage of the Cyclopentane hydrate shells, causing the unconverted water core to leak out of the shell. The leaked out water then converted to irregularly shaped Cyclopentane hydrate asperities on the shell after contacting the surrounding liquid Cyclopentane. Cohesion hysteresis between the Cyclopentane hydrate asperities was also measured and found to be similar to those between particles. The implication of these findings to the friction forces is discussed.
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surfactant adsorption and interfacial tension investigations on Cyclopentane hydrate
Langmuir, 2013Co-Authors: Zachary M Aman, Kyle Olcott, Kristopher Pfeiffer, Dendy E SloanAbstract:Gas hydrates represent an unconventional methane resource and a production/safety risk to traditional oil and gas flowlines. In both systems, hydrate may share interfaces with both aqueous and hydrocarbon fluids. To accurately model macroscopic properties, such as relative permeability in unconventional systems or dispersion viscosity in traditional systems, knowledge of hydrate interfacial properties is required. This work presents hydrate cohesive force results measured on a micromechanical force apparatus, and complementary water–hydrocarbon interfacial tension data. By combining a revised cohesive force model with experimental data, two interfacial properties of Cyclopentane hydrate were estimated: hydrate–water and hydrate–Cyclopentane interfacial tension values at 0.32 ± 0.05 mN/m and 47 ± 5 mN/m, respectively. These fundamental physiochemical properties have not been estimated or measured for Cyclopentane hydrate to date. The addition of surfactants in the Cyclopentane phase significantly reduced t...
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interfacial mechanisms governing Cyclopentane clathrate hydrate adhesion cohesion
Physical Chemistry Chemical Physics, 2011Co-Authors: Zachary M Aman, Erika P Brown, Dendy E SloanAbstract:The present work uses a micromechanical force apparatus to directly measure Cyclopentane clathrate hydrate cohesive force and hydrate-steel adhesive force, as a function of contact time, contact force and temperature. We present a hydrate interparticle force model, which includes capillary and sintering contributions and is based on fundamental interparticle force theories. In this process, we estimate the Cyclopentane hydrate tensile strength to be approximately 0.91 MPa. This hydrate interparticle force model also predicts the effect of temperature on hydrate particle cohesion force. Finally, we present the first direct measurements of hydrate cohesive force in the gas phase to be 9.1 ± 2.1 mN/m at approximately 3 °C (as opposed to 4.3 ± 0.4 mN/m in liquid Cyclopentane).
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influence of model oil with surfactants and amphiphilic polymers on Cyclopentane hydrate adhesion forces
Energy & Fuels, 2010Co-Authors: Zachary M Aman, Laura E. Dieker, Guro Aspenes, Dendy E SloanAbstract:Adhesion forces between Cyclopentane hydrate particles were measured at atmospheric pressure and 3.2 °C using an improved micromechanical force apparatus. Because of the complexity of crude oil systems, a series of model oils was prepared by adding surface-active components to 200 cP mineral oil as analogues to crude oil systems. The addition of 1 wt % sorbitan monooleate (Span80, a commercial anti-agglomerant), 1 wt % polypropylene glycol (an amphiphilic polymer), and 0.6 wt % commercial naphthenic acid mixture, separately, to a mineral oil and Cyclopentane continuous phase, reduced the average interparticle hydrate adhesion force by 37, 65, and 80%, respectively, compared to pure mineral oil and Cyclopentane. The 95% confidence bounds of the Span80 and mineral oil data points overlap; therefore, we cannot conclude that Span80 was effective at reducing the adhesion force between hydrate particles. These results indicate that model amphiphilic polymers and commercial naphthenic acid mixtures may be surfac...
Margus Lopp - One of the best experts on this subject based on the ideXlab platform.
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enantioselective organocatalytic michael addition of Cyclopentane 1 2 diones to nitroolefins
Synthesis, 2014Co-Authors: Gert Preegel, Ivar Jarving, Artur Noole, Kaja Ilmarinen, Tonis Kanger, Tonis Pehk, Margus LoppAbstract:Organocatalytic Michael additions of Cyclopentane-1,2-dione to different nitroolefins have been investigated. Cyclopentane-1,2-dione undergoes an organocatalytic reaction with substituted nitroolefins giving 3-substituted products in good to high yields (48–97%) and good stereoselectivity (up to 76% ee).
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heterogeneous platinum catalytic aerobic oxidation of Cyclopentane 1 2 diols to Cyclopentane 1 2 diones
Tetrahedron, 2014Co-Authors: Indrek Reile, Sigrid Kalle, Franz Werner, Ivar Jarving, Marina Kudrjashova, Anne Paju, Margus LoppAbstract:Abstract A method for the aerobic oxidation of Cyclopentane-1,2-diols to the corresponding diketones over a commercial heterogeneous Pt/C catalyst is described. Unsubstituted and 3- or 4-substituted Cyclopentane-1,2-diols are oxidized to 1,2-dicarbonyl compounds in good yields under the reported optimized reaction conditions (atmospheric air, 1 mol % of catalyst, 1 equiv of LiOH, aqueous solvents and 60 °C temperature). The method is applicable for producing Cyclopentane-1,2-diketones in a scalable manner.
Dendy E Sloan - One of the best experts on this subject based on the ideXlab platform.
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surfactant adsorption and interfacial tension investigations on Cyclopentane hydrate
Langmuir, 2013Co-Authors: Zachary M Aman, Kyle Olcott, Kristopher Pfeiffer, Dendy E SloanAbstract:Gas hydrates represent an unconventional methane resource and a production/safety risk to traditional oil and gas flowlines. In both systems, hydrate may share interfaces with both aqueous and hydrocarbon fluids. To accurately model macroscopic properties, such as relative permeability in unconventional systems or dispersion viscosity in traditional systems, knowledge of hydrate interfacial properties is required. This work presents hydrate cohesive force results measured on a micromechanical force apparatus, and complementary water–hydrocarbon interfacial tension data. By combining a revised cohesive force model with experimental data, two interfacial properties of Cyclopentane hydrate were estimated: hydrate–water and hydrate–Cyclopentane interfacial tension values at 0.32 ± 0.05 mN/m and 47 ± 5 mN/m, respectively. These fundamental physiochemical properties have not been estimated or measured for Cyclopentane hydrate to date. The addition of surfactants in the Cyclopentane phase significantly reduced t...
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interfacial mechanisms governing Cyclopentane clathrate hydrate adhesion cohesion
Physical Chemistry Chemical Physics, 2011Co-Authors: Zachary M Aman, Erika P Brown, Dendy E SloanAbstract:The present work uses a micromechanical force apparatus to directly measure Cyclopentane clathrate hydrate cohesive force and hydrate-steel adhesive force, as a function of contact time, contact force and temperature. We present a hydrate interparticle force model, which includes capillary and sintering contributions and is based on fundamental interparticle force theories. In this process, we estimate the Cyclopentane hydrate tensile strength to be approximately 0.91 MPa. This hydrate interparticle force model also predicts the effect of temperature on hydrate particle cohesion force. Finally, we present the first direct measurements of hydrate cohesive force in the gas phase to be 9.1 ± 2.1 mN/m at approximately 3 °C (as opposed to 4.3 ± 0.4 mN/m in liquid Cyclopentane).
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influence of model oil with surfactants and amphiphilic polymers on Cyclopentane hydrate adhesion forces
Energy & Fuels, 2010Co-Authors: Zachary M Aman, Laura E. Dieker, Guro Aspenes, Dendy E SloanAbstract:Adhesion forces between Cyclopentane hydrate particles were measured at atmospheric pressure and 3.2 °C using an improved micromechanical force apparatus. Because of the complexity of crude oil systems, a series of model oils was prepared by adding surface-active components to 200 cP mineral oil as analogues to crude oil systems. The addition of 1 wt % sorbitan monooleate (Span80, a commercial anti-agglomerant), 1 wt % polypropylene glycol (an amphiphilic polymer), and 0.6 wt % commercial naphthenic acid mixture, separately, to a mineral oil and Cyclopentane continuous phase, reduced the average interparticle hydrate adhesion force by 37, 65, and 80%, respectively, compared to pure mineral oil and Cyclopentane. The 95% confidence bounds of the Span80 and mineral oil data points overlap; therefore, we cannot conclude that Span80 was effective at reducing the adhesion force between hydrate particles. These results indicate that model amphiphilic polymers and commercial naphthenic acid mixtures may be surfac...
Amir H. Mohammadi - One of the best experts on this subject based on the ideXlab platform.
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Phase equilibria of binary clathrate hydrates of nitrogen+Cyclopentane/cyclohexane/methyl cyclohexane and ethane+Cyclopentane/cyclohexane/methyl cyclohexane
Chemical Engineering Science, 2011Co-Authors: Amir H. Mohammadi, Dominique RichonAbstract:Abstract In this communication, we first report hydrate dissociation conditions for the nitrogen+Cyclopentane, cyclohexane or methyl cyclohexane+water and ethane+Cyclopentane, cyclohexane or methyl cyclohexane+water systems at various temperatures. The experimental data were generated using an isochoric pressure-search method. The hydrate dissociation data for the aforementioned systems along with the hydrate dissociation data for the methane, carbon dioxide or hydrogen sulfide+Cyclopentane, cyclohexane or methyl cyclohexane+water systems collected from the literature are compared with the corresponding literature data in the absence of the aforementioned heavy hydrocarbons in order to study the hydrate promotion effects of Cyclopentane, cyclohexane or methyl cyclohexane. It is shown that these effects on ethane simple hydrate are not considerable unlike the corresponding effects on nitrogen, methane, carbon dioxide and hydrogen sulfide simple hydrates.
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phase equilibria of clathrate hydrates of methyl Cyclopentane methyl cyclohexane Cyclopentane or cyclohexane carbon dioxide
Chemical Engineering Science, 2009Co-Authors: Amir H. Mohammadi, Dominique RichonAbstract:In this work, experimental dissociation data for clathrate hydrates of methyl Cyclopentane, methyl cyclohexane, Cyclopentane or cyclohexane+carbon dioxide are reported at different temperatures. The experimental data were generated using an isochoric pressure-search method. The reliability of this method is examined by generating new dissociation data for clathrate hydrates of methyl Cyclopentane+methane and comparing them with the experimental data reported in the literature. The acceptable agreement demonstrates the reliability of the experimental method used in this work. The experimental data for all measured systems are finally compared with the corresponding literature data in the absence of the above mentioned cyclic compounds to identify their promotion effects.
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Phase equilibria of clathrate hydrates of methyl Cyclopentane, methyl cyclohexane, Cyclopentane or cyclohexane+carbon dioxide
Chemical Engineering Science, 2009Co-Authors: Amir H. Mohammadi, Dominique RichonAbstract:In this work, experimental dissociation data for clathrate hydrates of methyl Cyclopentane, methyl cyclohexane, Cyclopentane or cyclohexane+carbon dioxide are reported at different temperatures. The experimental data were generated using an isochoric pressure-search method. The reliability of this method is examined by generating new dissociation data for clathrate hydrates of methyl Cyclopentane+methane and comparing them with the experimental data reported in the literature. The acceptable agreement demonstrates the reliability of the experimental method used in this work. The experimental data for all measured systems are finally compared with the corresponding literature data in the absence of the above mentioned cyclic compounds to identify their promotion effects.
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Phase Equilibria of Clathrate Hydrates of Cyclopentane + Hydrogen Sulfide and Cyclopentane + Methane
Industrial & Engineering Chemistry Research, 2009Co-Authors: Amir H. Mohammadi, Dominique RichonAbstract:In this work, experimental hydrate dissociation data for the hydrogen sulfide + Cyclopentane + water and methane + Cyclopentane + water systems are reported in the temperature ranges of 295.4−310.0 K and 284.8−299.3 K, respectively. The experimental data were generated using an isochoric pressure-search method. The hydrate dissociation data for the methane + Cyclopentane + water system are compared with some selected experimental data from the literature, and the acceptable agreement demonstrates the reliability of the experimental method used in our work. The experimental data for both measured systems are finally compared with the corresponding literature data in the absence of Cyclopentane to study its hydrate promotion effects.
