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Dan Geană - One of the best experts on this subject based on the ideXlab platform.
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phase equilibria in ternary systems carbon dioxide 1 hexanol n Pentadecane and carbon dioxide 1 heptanol n Pentadecane modeling of holes in critical surface and miscibility windows
Journal of Chemical & Engineering Data, 2017Co-Authors: Dan GeanăAbstract:In this paper, the modeling of holes in the critical surface and miscibility windows, in the ternary carbon dioxide + 1-hexanol + n-Pentadecane and carbon dioxide + 1-heptanol + n-Pentadecane systems, was made. A software for phase equilibrium (PHEQ) data management and applications was used for calculations with the cubic general equation of state (GEOS), developed by the author. The software PHEQ was extended for calculations of critical lines (module GEOS CRITHK), using the Heidemann and Khalil method, and liquid–liquid–vapor (llg) lines (module GEOS LLVE) in binary and ternary mixtures. These modules were used for the calculation of holes in critical surfaces, and of miscibility windows. Binary and quasi-binary measured phase equilibrium data by Scheidgen [Ph.D. Thesis, Ruhr-Universitat Bochum, 1997] were necessary for understanding and modeling of ternary systems, regarding holes in critical surface and miscibility windows. For modeling, the equation of state Soave–Redlich–Kwong, integrated in the cu...
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phase behavior for the carbon dioxide n Pentadecane binary system
Journal of Chemical & Engineering Data, 2010Co-Authors: Catinca Secuianu, Viorel Feroiu, Dan GeanăAbstract:Vapor−liquid (VLE), liquid−liquid (LLE), and vapor−liquid−liquid equilibria (VLLE) data for the carbon dioxide + n-Pentadecane system at (293.15, 303.15, 313.15, 333.15, and 353.15) K up to 17.50 MPa and phase compositions of the two liquid phases and vapor phase as a function of temperature along the liquid−liquid−vapor (LLV) line are reported. The experimental method used in this work was a static-analytical method with liquid and vapor phase sampling. The new experimental results are discussed and compared with available literature data. Measured data and literature data for the carbon dioxide + n-Pentadecane system were modeled with the Soave−Redlich−Kwong (SRK) EoS using classical van der Waals (two-parameter conventional mixing rule, 2PCMR) mixing rules. A single set of interaction parameters was used to predict the complex phase behavior in the binary mixture carbon dioxide + n-Pentadecane.
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investigation of phase equilibria in the ternary system carbon dioxide 1 heptanol n Pentadecane
Fluid Phase Equilibria, 2007Co-Authors: Catinca Secuianu, Viorel Feroiu, Dan GeanăAbstract:Abstract Isothermal vapor–liquid equilibria measurements for binary and ternary mixtures containing carbon dioxide, 1-heptanol, and n -Pentadecane at the temperatures of 298.15 and 316.15 K are reported. Phase equilibria measurements were made in a high-pressure visual cell with variable volume based on the static-analytical method. Both binary systems exhibit type III phase behavior, according to the classification of van Konynenburg and Scott. The phase equilibrium in the binary systems was correlated with the Soave–Redlich–Kwong (SRK) equation of state coupled with the Huron–Vidal infinite dilution (HVID) mixing rules. The parameters for the binary mixtures are further used to predict the phase equilibria of the ternary system n -Pentadecane + 1-heptanol + carbon dioxide. Validation of the predictions was achieved by comparison with experimental results. The model has the capability to predict the cosolvency effect.
Catinca Secuianu - One of the best experts on this subject based on the ideXlab platform.
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densities and refractive indices of 1 hexanol n Pentadecane binary system at temperatures from 293 15 to 323 15 k
2014Co-Authors: Adrian Victor Crisciu, Catinca Secuianu, Viorel FeroiuAbstract:Densities and refractive indices of the 1-hexanol + n-Pentadecane binary system have been measured at T = (293.15, 298.15, 303.15, 313.15, and 323.15 K) and atmospheric pressure, over the whole composition range. Different theoretical (n-ρ) mixing rules were tested for the system studied. The excess molar volumes (VE), the molar refraction (R), and the corresponding deviations of the 1-hexanol + n-Pentadecane system have been calculated. The deviations of the respective excess properties have been also evaluated and correlated with the consistent 3-parameters Redlich-Kister equation with good results.
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phase behavior for the carbon dioxide n Pentadecane binary system
Journal of Chemical & Engineering Data, 2010Co-Authors: Catinca Secuianu, Viorel Feroiu, Dan GeanăAbstract:Vapor−liquid (VLE), liquid−liquid (LLE), and vapor−liquid−liquid equilibria (VLLE) data for the carbon dioxide + n-Pentadecane system at (293.15, 303.15, 313.15, 333.15, and 353.15) K up to 17.50 MPa and phase compositions of the two liquid phases and vapor phase as a function of temperature along the liquid−liquid−vapor (LLV) line are reported. The experimental method used in this work was a static-analytical method with liquid and vapor phase sampling. The new experimental results are discussed and compared with available literature data. Measured data and literature data for the carbon dioxide + n-Pentadecane system were modeled with the Soave−Redlich−Kwong (SRK) EoS using classical van der Waals (two-parameter conventional mixing rule, 2PCMR) mixing rules. A single set of interaction parameters was used to predict the complex phase behavior in the binary mixture carbon dioxide + n-Pentadecane.
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investigation of phase equilibria in the ternary system carbon dioxide 1 heptanol n Pentadecane
Fluid Phase Equilibria, 2007Co-Authors: Catinca Secuianu, Viorel Feroiu, Dan GeanăAbstract:Abstract Isothermal vapor–liquid equilibria measurements for binary and ternary mixtures containing carbon dioxide, 1-heptanol, and n -Pentadecane at the temperatures of 298.15 and 316.15 K are reported. Phase equilibria measurements were made in a high-pressure visual cell with variable volume based on the static-analytical method. Both binary systems exhibit type III phase behavior, according to the classification of van Konynenburg and Scott. The phase equilibrium in the binary systems was correlated with the Soave–Redlich–Kwong (SRK) equation of state coupled with the Huron–Vidal infinite dilution (HVID) mixing rules. The parameters for the binary mixtures are further used to predict the phase equilibria of the ternary system n -Pentadecane + 1-heptanol + carbon dioxide. Validation of the predictions was achieved by comparison with experimental results. The model has the capability to predict the cosolvency effect.
Kenneth J Shea - One of the best experts on this subject based on the ideXlab platform.
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stereoselective elaboration of the tricyclo 9 3 1 03 8 Pentadecane ring system atropisomeric control of stereochemistry
Tetrahedron Letters, 1992Co-Authors: Randy W Jackson, Richard G Higby, Kenneth J SheaAbstract:Abstract The chemistry of a conformationally locked tricyclo[9.3.1.0 3,8 ]Pentadecane skeleton, prepared by an atropselective type 2 intramolecular Diels-Alder reaction, is examined. In many cases, the conformation of the tricycle controls the facial selectivity of the addition of nucleophilic and electrophilic reagents to this ring system.
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the chemistry of c aromatic taxane derivatives atropisomer control of reaction stereochemistry
Tetrahedron, 1992Co-Authors: Randy W Jackson, Jeffrey W Gilman, Richard G Higby, Kenneth J SheaAbstract:Abstract The atropselective synthesis of tricyclo [9.3.1.03,8] Pentadecane ring systems is reported. Substrate conformation is utilized for the stereoselective elaboration of functional groups. The conformational dynamics of intermediates are also reported.
Viorel Feroiu - One of the best experts on this subject based on the ideXlab platform.
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densities and refractive indices of 1 hexanol n Pentadecane binary system at temperatures from 293 15 to 323 15 k
2014Co-Authors: Adrian Victor Crisciu, Catinca Secuianu, Viorel FeroiuAbstract:Densities and refractive indices of the 1-hexanol + n-Pentadecane binary system have been measured at T = (293.15, 298.15, 303.15, 313.15, and 323.15 K) and atmospheric pressure, over the whole composition range. Different theoretical (n-ρ) mixing rules were tested for the system studied. The excess molar volumes (VE), the molar refraction (R), and the corresponding deviations of the 1-hexanol + n-Pentadecane system have been calculated. The deviations of the respective excess properties have been also evaluated and correlated with the consistent 3-parameters Redlich-Kister equation with good results.
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phase behavior for the carbon dioxide n Pentadecane binary system
Journal of Chemical & Engineering Data, 2010Co-Authors: Catinca Secuianu, Viorel Feroiu, Dan GeanăAbstract:Vapor−liquid (VLE), liquid−liquid (LLE), and vapor−liquid−liquid equilibria (VLLE) data for the carbon dioxide + n-Pentadecane system at (293.15, 303.15, 313.15, 333.15, and 353.15) K up to 17.50 MPa and phase compositions of the two liquid phases and vapor phase as a function of temperature along the liquid−liquid−vapor (LLV) line are reported. The experimental method used in this work was a static-analytical method with liquid and vapor phase sampling. The new experimental results are discussed and compared with available literature data. Measured data and literature data for the carbon dioxide + n-Pentadecane system were modeled with the Soave−Redlich−Kwong (SRK) EoS using classical van der Waals (two-parameter conventional mixing rule, 2PCMR) mixing rules. A single set of interaction parameters was used to predict the complex phase behavior in the binary mixture carbon dioxide + n-Pentadecane.
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investigation of phase equilibria in the ternary system carbon dioxide 1 heptanol n Pentadecane
Fluid Phase Equilibria, 2007Co-Authors: Catinca Secuianu, Viorel Feroiu, Dan GeanăAbstract:Abstract Isothermal vapor–liquid equilibria measurements for binary and ternary mixtures containing carbon dioxide, 1-heptanol, and n -Pentadecane at the temperatures of 298.15 and 316.15 K are reported. Phase equilibria measurements were made in a high-pressure visual cell with variable volume based on the static-analytical method. Both binary systems exhibit type III phase behavior, according to the classification of van Konynenburg and Scott. The phase equilibrium in the binary systems was correlated with the Soave–Redlich–Kwong (SRK) equation of state coupled with the Huron–Vidal infinite dilution (HVID) mixing rules. The parameters for the binary mixtures are further used to predict the phase equilibria of the ternary system n -Pentadecane + 1-heptanol + carbon dioxide. Validation of the predictions was achieved by comparison with experimental results. The model has the capability to predict the cosolvency effect.
Birgitte Kiaer Ahring - One of the best experts on this subject based on the ideXlab platform.
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alkane biosynthesis by aspergillus carbonarius item 5010 through heterologous expression of synechococcus elongatus acyl acp coa reductase and aldehyde deformylating oxygenase genes
AMB Express, 2017Co-Authors: Malavika Sinha, Istvan Weyda, Annette Sorensen, Kenneth S Bruno, Birgitte Kiaer AhringAbstract:In this study we describe the heterologous expression of the recently identified cyanobacterial pathway for long chain alkane biosynthesis, involving the reduction of fatty acyl-ACP to fatty aldehyde and the subsequent conversion of this into alkanes, in the filamentous fungus Aspergillus carbonarius ITEM 5010. Genes originating from Synechococcus elongatus strain PCC7942, encoding acyl-ACP/CoA reductase and aldehyde deformylating oxygenase enzymes, were successfully expressed in A. carbonarius, which lead to the production of Pentadecane and heptadecane, alkanes that have not been previously produced by this fungus. Titers of 0.2, 0.5 and 2.7 mg/l Pentadecane and 0.8, 1.6 and 10.2 mg/l heptadecane were achieved using glucose, Yeast malt and oatmeal media, respectively. Besides producing alkanes, we found elevated levels of internal free fatty acids and triglycerides in the alkane producing transformant. These findings can indicate that a yet unidentified, native fatty aldehyde dehydrogenase channels back the fatty aldehydes into the fatty acid metabolism, thus competing for substrate with the heterologously expressed fatty aldehyde deformylating oxygenase. These findings will potentially facilitate the future application of robust, fungal cell factories for the production of advanced biofuels from various substrates.
