Isotopentrennung durch Thermodiffusion in flüssiger Phase

Alexander, K.F.

doi:10.1002/prop.19600080102

Cited by 13 publications

(3 citation statements)

References 23 publications

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“…( 17) may describe the isotopic effects in thermodiffusion reported in refs. [26][27][28]. Our results predict the Soret coefficients closer to the results of ref.…”

supporting

confidence: 88%

Statistical thermodynamic expression for the Soret coefficient

Semenov

2010

EPL

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The thermodynamic Soret coefficient for diluted mixtures expressed through the temperature derivative of the particle chemical potential at constant pressure is calculated using statistical mechanics. The local pressure distribution is obtained using the condition of the local thermodynamic equilibrium around an isolated particle. The Laplace contribution to the local pressure distribution within the layer of the liquid around the particle is accounted. The calculations yield results equivalent to the hydrodynamic approach and add a new kinetic term to the Soret coefficient. This term is related to the difference in the thermal velocities between the particles with different mass. The kinetic contribution to thermodiffusion explains the isotope thermodiffusion effect observed in molecular systems. The theory describes most of the experimental data on thermodiffusion of the isolated molecular and colloid particles placed in non-electrolyte liquids.

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“…( 17) may describe the isotopic effects in thermodiffusion reported in refs. [26][27][28]. Our results predict the Soret coefficients closer to the results of ref.…”

supporting

confidence: 88%

Statistical thermodynamic expression for the Soret coefficient

Semenov

2010

EPL

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“…Thermal diffusion in the liquid phase is potentially more useful than thermal diffusion in the gas phase. According to theory, the liquid phase apparatus is much smaller than the equivalent gas phase apparatus; reduced isotopic thermal diffusion factors are much larger in the liquid phase; and a broader range of compounds can be found for liquid phase operation (Alexander, 1960).…”

Section: Introductionmentioning

confidence: 99%

“…Liquid phase columns are subject to parasitic thermogravitational circulations caused by nonuniformity of the annulus and asymmetry of the temperature gradient. Little quantitative information is available; however, Alexander (1960) estimated parasitic effects for some of the columns constructed by Abelson, Rosen, and Hoover. The parasitic effects were such that the separations observed were equivalent to those of a perfect column no more than V3 to l/2 the length of the actual column.…”

Section: Introductionmentioning

confidence: 99%

Separation of Highly Enriched ³⁴S by Liquid Phase Thermal Diffusion of Carbon Disulfide

Rutherford¹

1978

Ind. Eng. Chem. Proc. Des. Dev.

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The stable Isotope, 34S, was separated at high enrichment by liquid phase thermal diffusion of carbon disulfide in a 12-column, dual cascade system. The first cascade of seven columns was used to separate the mixed molecule, C32S34S, from feed of natural isotopic abundance. Isotopic scrambling of the mixed molecule at high temperature yielded significant amounts of the doubly substituted species, C34S34S. The converted stream was used as feed to a second cascade of five columns from which the C34S34S was extracted as product. Over a period of several months 25.3 g of carbon disulfide was collected at 34S concentrations greater than 91%. Performance of the system was in reasonable agreement with theoretical predictions; however, the measured transport rate of 34S was approximately half of the rate predicted on the basis of recent measurements of the isotopic thermal diffusion factor.

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