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- W2061597059 abstract "Binary diffusion coefficients D12 have been determined for benzene, n-propylbenzene and 1,3,5-trimethylbenzene in supercritical CO2 at 40°C from 80 to 160 bar and additionally between 35 and 55°C at 110 and 130 bar with the chromatographic broadening technique (CBT). The effect of secondary flow was investigated. The observed binary diffusion coefficients are of the order of 2 · 10−4 cm2 · s−1. For a pressure rise from 80 to 160 bar, the diffusion coefficients decrease by about 50%. The isobaric temperature dependence of diffusion coefficients at 110 bar is substantially higher than that at 130 bar; for constant densities ρ, however, the temperature coefficients seem to be very small. n-Propylbenzene was found to diffuse faster than its structural isomer 1,3,5-trimethylbenzene. At higher densities F ≡ (D12· ρ) /(D12 · ρ)id rises well above the value given by the Enskog-Thorne theory and finally approaches approximately unity. Die binären Diffusionskoeffizienten D12 von Benzol, n-Propylbenzol und 1,3,5-Trimethylbenzol wurden bei 40°C von 80 bis 160 bar sowie bei 110 und 130 bar von 35 bis 55°C nach der chromatographischen Peakverbreiterungsmethode experimentell bestimmt. Der Effekt der Sekundärstromung wurde untersucht. Die beobachteten Diffusionskoeffizienten sind von der Größenordnung 2·10−4 cm2 · s−1. Durch eine Druckerhöhung von 80 auf 160 bar bei 40°C werden die Diffusionskoeffizienten um etwa 50% herabgesetzt. Bei 110 bar wurde eine höhere Temperaturabhängigkeit des binären Diffusionskoeffizienten beobachtet als bei 130 bar; sie ist jedoch recht gering bei konstanter Dichte ρ. n-Propylbenzol diffundiert unter vergleichbaren Bedingungen schneller als sein Strukturisomer 1,3,5-Trimethylbenzol. Die experimentell erhaltenen Werte für die Größe F ≡ (D12 · ρ)/(D12 · ρ)id liegen höher als die nach der Enskog-Thorne-Theorie berechneten; bei hohen Dichten erreicht der experimentelle F-Faktor ungefähr der Wert eins." @default.
- W2061597059 created "2016-06-24" @default.
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- W2061597059 date "1979-10-01" @default.
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- W2061597059 title "Determination of Binary Diffusion Coefficients of Benzene and Some Alkylbenzenes in Supercritical CO2 between 308 and 328 K in the Pressure Range 80 to 160 bar with Supercritical Fluid Chromatography (SFC)" @default.
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- W2061597059 doi "https://doi.org/10.1002/bbpc.19790831003" @default.
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