Related Experiment Video
Updated: May 19, 2026

Measurement of the Rheology of Crude Oil in Equilibrium with CO2 at Reservoir Conditions
Published on: June 6, 2017
Measurement of thermodiffusion coefficient of hydrocarbon binary mixtures under pressure with the thermogravitational
P Urteaga1, M M Bou-Ali, D Alonso de Mezquia
1Mechanical and Manufacturing Department, Engineering Faculty, Mondragon Unibertsitatea, Loramendi 4 Apdo. 20500 Mondragon, Spain.
Abstract:
It was designed and constructed a new thermogravitational column able to operate at high pressures (up to 50 MPa). This new thermogravitational column is of the cylindrical type with closed ends. It is made of stainless steel. The length of the column is 0.5 m and the gap between its two walls is variable. First, the column was validated at atmospheric pressure by means of measurements of the thermodiffusion coefficient of well-known binary mixtures. Then, this new thermogravitational column was used to measure the thermodiffusion coefficient of the binary mixtures 1,2,3,4-tetrahydronaphtalene/isobutylbenzene, 1,2,3,4-tetrahydronaphtalene/n-dodecane, and isobutylbenzene/n-dodecane at high pressures and within the pressure range between 0.1 and 20 MPa at a mean temperature of 25 °C. We have found a linear dependence between the thermodiffusion coefficient and the pressure.
Related Concept Videos
Clausius-Clapeyron Equation
The Thermodynamics of Mixing
Intermolecular Forces and Physical Properties
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Thermodynamic Properties of Ideal Solutions
Extraction: Partition and Distribution Coefficients
For extracting a solute from an aqueous phase into an organic...

