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

作者：Urteaga P^*; Bou Ali M M; Alonso de Mezquia D; Santamaria J; Santamaria C; Madariaga J A; Bataller H

来源：Review of Scientific Instruments, 2012, 83(7): 074903.

DOI：10.1063/1.4737628

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 degrees C. We have found a linear dependence between the thermodiffusion coefficient and the pressure.

• 出版日期2012-7