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Soret coefficient of the n-dodecane-n-hexane binary mixture under high pressure
Ion Lizarraga1, Fabrizio Croccolo2,3, Henri Bataller2
1MGEP Mondragon Goi Eskola Politeknikoa, Mechanical and Industrial Manufacturing Department, Loramendi 4, Apartado 23, 20500, Mondragon, Spain.
The European Physical Journal. E, Soft Matter
|April 1, 2017
Summary
This study measured diffusion and thermodiffusion coefficients for a hydrocarbon mixture under high pressure. Both coefficients were found to decrease as pressure increased.
Area of Science:
- Thermodynamics
- Fluid Dynamics
- Physical Chemistry
Background:
- Understanding transport properties of hydrocarbon mixtures is crucial for various industrial applications.
- High-pressure behavior of these properties is not well-documented.
- Accurate data is needed for process design and simulation.
Purpose of the Study:
- To determine the Soret coefficient of a binary hydrocarbon mixture at high pressures.
- To investigate the pressure dependence of molecular diffusion and thermodiffusion coefficients.
- To provide experimental data for validating theoretical models.
Main Methods:
- Utilized a thermogravitational column and dynamic near-field imaging for Soret coefficient determination.
- Measured molecular diffusion coefficient using dynamic analysis of light scattering.
- Employed a high-pressure densimeter and viscometer for density, expansion, and viscosity measurements.
Main Results:
- The molecular diffusion coefficient was measured up to 20 MPa.
- The thermodiffusion coefficient was determined from 0.1 MPa to 10 MPa.
- Both molecular diffusion and thermodiffusion coefficients exhibit a decreasing trend with increasing pressure.
Conclusions:
- High pressure significantly influences the transport properties of hydrocarbon mixtures.
- The study provides valuable experimental data on the pressure-dependent diffusion behavior.
- Findings contribute to a better understanding of non-ideal mixture thermodynamics.