The application of a shear mode piezoelectric sensor to monitoring the high-pressure phase behaviour of asymmetric binary systems

Ke, Jie; Reid, Katherine E.; Poliakoff, Martyn

doi:10.1016/j.supflu.2006.05.003

Cited by 10 publications

(17 citation statements)

References 62 publications

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“…We have also shown that the liquid-liquid-vapour equilibrium can be studied using a single sensor. |Z | min exhibits two inflexion points with increasing the total volume of the system, corresponding to the formations of the second liquid phase and the vapour phase (the third phase; Ke et al 2007). The existence of a three-phase equilibrium, inferred from our measurements with a single sensor, was subsequently confirmed by using a conventional view cell.…”

Section: Shear-mode Quartz Sensorsupporting

confidence: 61%

“…the optic fibre-see below). The shear-mode sensor has been used for measuring the p-T phase boundary and the critical point of a wide range of binary mixtures (Ke et al 2004(Ke et al , 2005(Ke et al , 2007, including a type I mixture (CO 2 + MeOH), a type II mixture (CO 2 + n-heptane), three type III mixtures (CO 2 + N 2 , CO 2 + H 2 , CO 2 + 1-octanol) and a type IV mixture (CO 2 + 2-octanol), according to the classification by van Konynenburg and Scott (1980). Our results demonstrate that the quartz sensor method is applicable for studying fluid phase equilibria of highly asymmetric binary systems, which do not necessarily have a continuous critical line between both critical points of pure components (e.g.…”

Section: Shear-mode Quartz Sensormentioning

confidence: 99%

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Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions

Sánchez-Vicente

Akien

et al. 2010

Proc. R. Soc. A.

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Detecting phase transitions in high-pressure CO 2 and supercritical fluids was first attempted in the nineteenth century. By contrast, Green Chemistry, the design and implementation of cleaner methods of manufacturing and processing chemicals, is barely 20 years old. Now, the use of CO 2 as an environmentally more acceptable replacement for traditional solvents for greener chemical reactions is creating the need for new, more rapid methods for elucidating high-pressure phase behaviour. This paper describes the advantages and limitations of a number of approaches, developed in Nottingham, to meet this need, including acoustic measurements, shear-mode quartz sensors, the fibre-optic reflectometer, the use of holey fibres, attenuated total reflectance infrared spectroscopy and pressure drop measurements.

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Section: Shear-mode Quartz Sensorsupporting

confidence: 61%

Section: Shear-mode Quartz Sensormentioning

confidence: 99%

Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions

Sánchez-Vicente

Akien

et al. 2010

Proc. R. Soc. A.

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“…Developing accurate and robust models requires precise and comprehensive experimental data. This is true for asymmetric mixtures containing a supercritical solvent and one or more low‐volatility hydrocarbon solutes 11, 12.…”

Section: Introductionmentioning

confidence: 99%

Analytic Setup for Multicomponent High‐Pressure Phase Equilibria via Dual Online Gas Chromatography

2015

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A high-pressure analytic phase equilibria setup, capable of operation at 150°C and 30 MPa, was developed. The variable-volume view cell contains two heightadjustable samplers enabling simultaneous sampling from two phases. Concurrent analysis of both samples was performed with dual online gas chromatography (GC). The GC comprises two inlets, four columns, two switch valves, and three detectors, arranged in parallel pathways. Quantitative detector calibrations were used. The setup was validated by sampling from a one-phase ternary of known composition, and comparison with binary and ternary literature data. The setup produces accurate phase composition data for supercritical systems and is wellsuited to handle mixture constituents ranging from volatile gases to mid-length hydrocarbons.

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“…At temperatures close to the critical point, three-phase behavior has been noted for selected CO 2 + 1-alcohol systems. 26,28,41,42 Some researchers have tried to define the limits of the three-phase region and have published upper critical end point (UCEP) data. 26,28,41,42 As the molecular mass of the alcohols increase, the temperature and pressure of the UCEP decreases.…”

Section: Phase Behavior Analysismentioning

confidence: 99%

“…For systems CO 2 + 1-pentadecanol and higher, information available suggests that either the UCEP is hidden through solidification or no longer exists. Therefore, for these systems at present no outcome as to the type of phase behavior can be given, however, the phase 26 Lam et al, 27 and Secuianu and co-workers 28,42 behavior type needs to take the highly prominent temperature inversion into account. More recently Bolz et al 32 suggested an alternative classification.…”

Section: Phase Behavior Analysismentioning

confidence: 99%

High Pressure Phase Behavior of the Homologous Series CO₂ + 1-Alcohols

Schwarz

2018

J. Chem. Eng. Data

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The phase behavior of the supercritical CO 2 + 1-alcohol homologous series for 1-octanol and higher alcohols is investigated. A literature survey revealed that sufficient data are available lower alcohols (1-decanol and lower) but data are limited for higher 1-alcohols. Data for CO 2 + 1-dodecanol, CO 2 + 1-tetradecanol, and CO 2 +1-hexadecanol were thus measured using a visual static synthetic method for T = 313− 353 K. Measured and literature data indicated that the phase transition pressures are very high (>28 MPa) for CO 2 + 1decanol and higher alcohols in the mixture critical region. Additionally, a temperature inversion (increasing temperature leading to decreasing phase transition pressure) is present in the mixture critical region and is more pronounced in systems containing higher 1-alcohols. The temperature inversion is postulated to result from the formation of alcohol multimers due to hydrogen bonding between alcohol molecules. From the phase behavior data as well as published upper critical end point and solid−liquid−liquid−vapor equilibria data, Type III phase behavior according to the classification of Scott and van Konynenburg is assigned to the systems CO 2 + 1-octanol to CO 2 + 1tetradecanol. However, for higher alcohols additional investigations are required to assign a phase behavior type. This systematic study hopes to aid future thermodynamic modeling attempts to describe the complex phase behavior of CO 2 + 1-alcohol systems.

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The application of a shear mode piezoelectric sensor to monitoring the high-pressure phase behaviour of asymmetric binary systems

Cited by 10 publications

References 62 publications

Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions

Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions

Analytic Setup for Multicomponent High‐Pressure Phase Equilibria via Dual Online Gas Chromatography

High Pressure Phase Behavior of the Homologous Series CO₂ + 1-Alcohols

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The application of a shear mode piezoelectric sensor to monitoring the high-pressure phase behaviour of asymmetric binary systems

Cited by 10 publications

References 62 publications

Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions

Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions

Analytic Setup for Multicomponent High‐Pressure Phase Equilibria via Dual Online Gas Chromatography

High Pressure Phase Behavior of the Homologous Series CO2 + 1-Alcohols

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Product

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High Pressure Phase Behavior of the Homologous Series CO₂ + 1-Alcohols