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Pascale Subra - One of the best experts on this subject based on the ideXlab platform.
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high pressure vapor liquid equilibrium for the binary systems Carbon Dioxide dimethyl sulfoxide and Carbon Dioxide dichloromethane
Journal of Chemical & Engineering Data, 2002Co-Authors: Arlette Vega Gonzalez, And Roland Tufeu, Pascale SubraAbstract:High-pressure vapor−liquid equilibrium data were measured for two binary systems: Carbon Dioxide + dimethyl sulfoxide at four temperatures from 309 to 329 K and pressures up to 13 MPa, and Carbon Dioxide + dichloromethane at 311.41 K and 326.95 K and pressures up to 9.5 MPa. Bubble points were determined by a synthetic method where a mixture of known composition is prepared in a sapphire cell of variable volume. The reliability of the equipment and method was established through comparison with literature on the Carbon Dioxide + ethanol system. These measurements were made at 314.45 and 324.17 K.
Abla Mehio Sibai - One of the best experts on this subject based on the ideXlab platform.
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end tidal Carbon Dioxide tension during laparoscopic cholecystectomy correlation with the baseline value prior to Carbon Dioxide insufflation
Anaesthesia, 1994Co-Authors: Anis Baraka, Rola Hammoud, F Najjar, Ghattas Khoury, Marie T Aouad, Samar Jabbour, Abla Mehio SibaiAbstract:Summary An investigation of end-tidal Carbon Dioxide tension changes was carried out in 19 healthy adult patients undergoing laparoscopic cholecystectomy. Following induction of anaesthesia, and throughout surgery, the end-tidal Carbon Dioxide tension was continuously monitored by capnography. The value following Carbon Dioxide insufflation increased with time to reach a maximum value after 40 min. Correlation of the individual maximum end-tidal Carbon Dioxide tension during laparoscopy with the corresponding baseline value prior to Carbon Dioxide insufflation showed a positive linear relationship (correlation coefficient 0.86). The correlation showed that an end-tidal Carbon Dioxide tension of 5.32 kPa (40 mmHg) can be achieved during laparoscopy when the baseline value is adjusted to around 4.0 kPa (30 mmHg).
Nicola Elvassore - One of the best experts on this subject based on the ideXlab platform.
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high pressure density and vapor liquid equilibrium for the binary systems Carbon Dioxide ethanol Carbon Dioxide acetone and Carbon Dioxide dichloromethane
Journal of Supercritical Fluids, 2005Co-Authors: Matteo Stievano, Nicola ElvassoreAbstract:Abstract An apparatus for the measurement of vapor–liquid equilibrium (VLE, P–T–x ) data and density of saturated-liquid and high-pressure liquid phase of compressed gas-organic solvent systems was designed, built and tested. A synthetic method, with recirculation of the liquid phase through a high-pressure densimeter by a magnetic driven centrifugal pump, was used. The thermodynamic equilibrium was reached in a visual cell with variable volume ranging between 30 and 60 cm 3 . The compositions of the phases were evaluated by external gravimetric method. The estimated accuracy of the measured data was ±0.02 K for temperature, ±0.05 MPa for pressure, ±0.005 in mole fraction for liquid compositions and ±0.05 g/L for liquid density. Vapor–liquid equilibrium data and saturated-liquid density were obtained for the following systems: Carbon Dioxide–ethanol and Carbon Dioxide–acetone at 291.15, 303.15, 313.15 and 323.15 K and Carbon Dioxide–dichloromethane at 291.15, 303.15 and 311.15 K. For the latter system, high-pressure liquid density data were measured up to 18 MPa. The experimental data were correlated by both Peng–Robinson and SAFT equation of state. SAFT EOS gives better correlations of vapor–liquid data and accurate predictions of high-pressure density of the liquid phase.
Neil R Foster - One of the best experts on this subject based on the ideXlab platform.
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viscosity measurements on saturated gas expanded liquid systems acetone and Carbon Dioxide
Journal of Supercritical Fluids, 2008Co-Authors: M Armenti, Fariba Dehghani, Raffaella Mammucari, Neil R FosterAbstract:A recently developed method of falling-weight viscometry was employed to determine the experimental viscosities of the gas-expanded liquid system of ethanol and Carbon Dioxide at saturation. By adding Carbon Dioxide into an isochoric system containing metered amounts of ethanol, Carbon Dioxide concentrations within the gas-expanded liquid system were systematically varied between 0.15 and 0.80 mole fraction in 0.05 increments at constant system temperatures of 25, 30, 35 and 40 °C. Similar to the gas-expanded liquid system of methanol and Carbon Dioxide, an increase in Carbon Dioxide concentration in the liquid phase, liquid volume expansion, liquid density and system pressure resulted in a decrease in liquid phase viscosity. The significance of system temperature however, is more apparent with the gas-expanded liquid system of ethanol and Carbon Dioxide when compared to the gas-expanded liquid system of methanol and Carbon Dioxide. At equal compositions but varying system temperatures, not only is the viscosity of the ethanol and Carbon Dioxide system affected to a greater extent, the point at which viscosity reduction is insignificant with an increase in Carbon Dioxide composition occurs earlier with increasing system temperatures. The estimation of liquid phase viscosities of gas-expanded liquid systems is therefore difficult without experimental data.
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viscosity measurements on gas expanded liquid systems methanol and Carbon Dioxide
Journal of Supercritical Fluids, 2007Co-Authors: Fariba Dehghani, Neil R FosterAbstract:The viscosities of the gas expanded liquid system of methanol with Carbon Dioxide were experimentally determined with a recently developed method of falling-weight viscometry. Carbon Dioxide concentrations within the gas expanded liquid system were systematically increased by the addition of Carbon Dioxide into an isochoric system containing metered amounts of methanol. New experimental viscosity data for the expanded liquid phase of methanol with Carbon Dioxide are presented at 25, 30, 35 and 40 °C and at mole fractions of Carbon Dioxide in the liquid phase between 0.10 and 0.85 in 0.05 increments along all four isotherms. The apparent correlating factor for deducing the viscosity of Carbon Dioxide expanded methanol appears to be the composition of the liquid phase and the degree of volume expansion of the liquid phase, as opposed to liquid density and system pressure values. Viscosity reduction is almost linear up to about 0.5 mole fraction Carbon Dioxide before the rate of viscosity reduction upon Carbon Dioxide enrichment decreases. An increase in the degree of volume expansion of the liquid phase brings about a dramatic initial reduction in liquid phase viscosity. Viscosity reduction appears to be linear in excess of 300% liquid phase volume expansion.
Arlette Vega Gonzalez - One of the best experts on this subject based on the ideXlab platform.
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high pressure vapor liquid equilibrium for the binary systems Carbon Dioxide dimethyl sulfoxide and Carbon Dioxide dichloromethane
Journal of Chemical & Engineering Data, 2002Co-Authors: Arlette Vega Gonzalez, And Roland Tufeu, Pascale SubraAbstract:High-pressure vapor−liquid equilibrium data were measured for two binary systems: Carbon Dioxide + dimethyl sulfoxide at four temperatures from 309 to 329 K and pressures up to 13 MPa, and Carbon Dioxide + dichloromethane at 311.41 K and 326.95 K and pressures up to 9.5 MPa. Bubble points were determined by a synthetic method where a mixture of known composition is prepared in a sapphire cell of variable volume. The reliability of the equipment and method was established through comparison with literature on the Carbon Dioxide + ethanol system. These measurements were made at 314.45 and 324.17 K.