High-Pressure Vapor−Liquid Equilbria of Some Carbon Dioxide + Organic Binary Systems

Lazzaroni, Michael J.; Bush, David; Brown, J. Steven; Eckert, Charles A.

doi:10.1021/je0498560

Cited by 136 publications

(79 citation statements)

References 21 publications

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“…5, experimental results of vapor-liquid equilibria for CO 2 + tetrahydrofuran system at 60 • C are shown. Solubilities of CO 2 in tetrahydrofuran were in good agreement with literature values [14]. The apparatus and procedures were determined to be reliable.…”

Section: Resultssupporting

confidence: 84%

“…As shown in Fig. 4 for the CO 2 + tetrahydrofuran system, the viscosity decreased with increasing CO 2 mole fraction and the density slightly increased with increasing CO 2 mole Bubble-point pressures obtained for the CO 2 + tetrahydrofuran system at temperature of 60 • C compared with vapor-liquid equilibria data in the literature [14]. Filled circles represent this work, unfilled circles, squares represent literature data [14] fraction.…”

Section: Resultsmentioning

confidence: 84%

“…4 for the CO 2 + tetrahydrofuran system, the viscosity decreased with increasing CO 2 mole fraction and the density slightly increased with increasing CO 2 mole Bubble-point pressures obtained for the CO 2 + tetrahydrofuran system at temperature of 60 • C compared with vapor-liquid equilibria data in the literature [14]. Filled circles represent this work, unfilled circles, squares represent literature data [14] fraction. Remarkably, the viscosity reduction due to CO 2 showed close to a linear dependence on the CO 2 mole fraction, which means that the viscosity reduction provided by CO 2 in the organic liquid system can be calculated by a simple linear relationship.…”

Section: Resultsmentioning

confidence: 89%

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A Digital Variable-Angle Rolling-Ball Viscometer for Measurement of Viscosity, Density, and Bubble-Point Pressure of CO2 and Organic Liquid Mixtures

et al. 2008

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A new apparatus was developed for measuring the viscosity, density, and bubble-point pressure of CO 2 and organic liquid mixtures. The apparatus is based on the rolling-ball principle and consists of a computer-controlled stepper motor that rotates a high-pressure cell that is equipped with a sapphire window, a movable piston, and a position-sensing device. Design of the high-pressure cell was made such that compositions could be determined by mass. The viscosity was determined by sensing the speed of a rolling ball, and the density was determined by sensing the position of the piston with a linear-variable differential transformer. Bubble-point pressures were measured with the synthetic method. The viscosity and density of octane and decane were measured, and the average deviations of these properties compared with reliable literature values were 1.1 % and 0.15 %, respectively. The viscosity and density of CO 2 + tetrahydrofuran system were measured at a temperature of 60 • C, a pressure of 10.2 MPa, and CO 2 mole fractions up to 0.3. Bubble-point pressures for the CO 2 + tetrahydrofuran system were in good agreement with literature data.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 89%

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A Digital Variable-Angle Rolling-Ball Viscometer for Measurement of Viscosity, Density, and Bubble-Point Pressure of CO2 and Organic Liquid Mixtures

et al. 2008

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“…Ternary phase diagrams have been calculated using the measurements recorded using the sapphire cell technique [11][12][13] . Using the following material balances, two specific ternary phase diagrams were constructed as shown in Figures 5 and 6.…”

Section: Representative Resultsmentioning

confidence: 99%

High-pressure Sapphire Cell for Phase Equilibria Measurements of CO<sub>2</sub>/Organic/Water Systems

Pollet

Ethier

Senter

et al. 2014

JoVE

Self Cite

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The high pressure sapphire cell apparatus was constructed to visually determine the composition of multiphase systems without physical sampling. Specifically, the sapphire cell enables visual data collection from multiple loadings to solve a set of material balances to precisely determine phase composition. Ternary phase diagrams can then be established to determine the proportion of each component in each phase at a given condition. In principle, any ternary system can be studied although ternary systems (gas-liquid-liquid) are the specific examples discussed herein. For instance, the ternary THF-Water-CO 2 system was studied at 25 and 40 °C and is described herein. Of key importance, this technique does not require sampling. Circumventing the possible disturbance of the system equilibrium upon sampling, inherent measurement errors, and technical difficulties of physically sampling under pressure is a significant benefit of this technique. Perhaps as important, the sapphire cell also enables the direct visual observation of the phase behavior. In fact, as the CO 2 pressure is increased, the homogeneous THFWater solution phase splits at about 2 MPa. With this technique, it was possible to easily and clearly observe the cloud point and determine the composition of the newly formed phases as a function of pressure.The data acquired with the sapphire cell technique can be used for many applications. In our case, we measured swelling and composition for tunable solvents, like gas-expanded liquids, gas-expanded ionic liquids and Organic Aqueous Tunable Systems (OATS) [1][2][3][4] . For the latest system, OATS, the high-pressure sapphire cell enabled the study of (1) phase behavior as a function of pressure and temperature, (2) composition of each phase (gas-liquid-liquid) as a function of pressure and temperature and (3) catalyst partitioning in the two liquid phases as a function of pressure and composition. Finally, the sapphire cell is an especially effective tool to gather accurate and reproducible measurements in a timely fashion. Video LinkThe video component of this article can be found at

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“…On the phase equilibrium data for carbon dioxide + THF mixtures, Im et al [2] [3] had reported VLE, molar volume, and volume expansion data at 298, 313, and 333 K by the PTx method using Patel-Teja equation of state from the measurements of the carbon dioxide and THF initially loaded and the total vapor volume. However, the experimental data of molar volume and volume expansion data seem to be a low accuracy because there are some problems in the experimental procedures.…”

Section: Introductionmentioning

confidence: 99%

High pressure vapor–liquid equilibria for carbon dioxide+tetrahydrofuran mixtures

Kodama

Yagihashi

Hosoya

et al. 2010

Fluid Phase Equilibria

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High-Pressure Vapor−Liquid Equilbria of Some Carbon Dioxide + Organic Binary Systems

Cited by 136 publications

References 21 publications

A Digital Variable-Angle Rolling-Ball Viscometer for Measurement of Viscosity, Density, and Bubble-Point Pressure of CO2 and Organic Liquid Mixtures

A Digital Variable-Angle Rolling-Ball Viscometer for Measurement of Viscosity, Density, and Bubble-Point Pressure of CO2 and Organic Liquid Mixtures

High-pressure Sapphire Cell for Phase Equilibria Measurements of CO<sub>2</sub>/Organic/Water Systems

High pressure vapor–liquid equilibria for carbon dioxide+tetrahydrofuran mixtures

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