Methods of determining the thermal-diffusion constant in liquid mixtures

Bukhtilova, M. A.; Dorogush, V. M.; Zamskii, B. N.; Ivakhnik, V. P.; Rabinovich, G. D.

doi:10.1007/bf00824973

Cited by 1 publication

(1 citation statement)

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“…However, the experimental determination of the thermal diffusion factor, a , which characterizes this phenomenon, is a delicate problem due to the smallness of the effect. In general, two methods have traditionally been used: the "pure thermal diffusion cell" method (6) and the "flow-cell" method (7) which lead to a, values which are not always reliable enough because it is difficult to control convection in the cell and also because the values found for separation are extremely small, especially for small concentrations of one of the components of the mixture (8,9). For these reasons, the Clusius-Dickel thermal diffusion column has been used recently to get a better determination of uT values (10-12).…”

Section: Thermogravitational Column As a Technique For Thermal Diffusmentioning

confidence: 99%

Thermogravitational Column as a Technique for Thermal Diffusion Factor Measurement in Liquid Mixtures

Ecenarro¹,

Madariaga²,

Navarro³

et al. 1989

Separation Science and Technology

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Thermogravitational thermal diffusion separations are studied for benzene-nheptane, benzene-n-hexane, toluene-n-heptane, toluene-n-hexane, carbon tetrachloride-n-hexane, and cyclohexane-n-hexane mixtures at a mean temperature of 37.5"C. The column used was of 90 cm length with a 0.095 cm gap. Despite its length, this column can be used as a standard for the value of aT extraction when the separation factor is extrapolated to A T = 0°C. Thermal diffusion factors are calculated for benzene-n-heptane and benzene-n-hexane mixtures in different concentrations. For the rest of the systems investigated, q D l 2 values (011 being the ordinary diffusion coefficient) are calculated.

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Section: Thermogravitational Column As a Technique For Thermal Diffusmentioning

confidence: 99%