Measurement of thermodiffusion coefficient of hydrocarbon binary mixtures under pressure with the thermogravitational technique

P. Urteaga (1) , M. M. Bou-Ali (1) , D. Alonso de Mezquia (1) , J. Santamaria (1) , C. Santamaria (2) , J.A. Madariaga (2) , Henri Bataller (3)

1 MGEP - Manufacturing Department
2 Department of Applied Physics
3 LFCR - Laboratoire des Fluides Complexes et leurs Réservoirs

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-tetrahydronaphtaleneisobutylbenzene, 1,2,3,4-tetrahydronaphtalenen-dodecane, and isobutylbenzenen-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.

Mots clés: Thermogravimetry Medline is the source for the MeSH terms of this document; High pressure; Linear dependence; Mean temperature; Pressure ranges; Thermodiffusion coefficients Engineering controlled terms: Atmospheric pressure; Binary mixtures; Hydrocarbons Engineering main heading: Thermal diffusion in liquids EMTREE drug terms: hydrocarbon EMTREE medical terms: article; chemistry; drug mixture; equipment; instrumentation; methodology; thermogravimetry MeSH: Complex Mixtures; Diffusion; Equipment Design; Equipment Failure Analysis; Hydrocarbons; Pressure; Thermal Conductivity; Thermogravimetry Medline is the source for the MeSH terms of this document.

Domaines: Chimie-Physique [physics.chem-ph]

P. Urteaga, M. M. Bou-Ali, D. Alonso de Mezquia, J. Santamaria, C. Santamaria, et al.. Measurement of thermodiffusion coefficient of hydrocarbon binary mixtures under pressure with the thermogravitational technique. Review of Scientific Instruments, 2012, 83 (7), pp.Article number074903. ⟨10.1063/1.4737628⟩. ⟨hal-00833906⟩