Measurement and modelling of tracer diffusivities of gallic acid in liquid ethanol and in supercritical CO2 modified with ethanol
authors Leite, J; Magalhaes, AL; Valente, AA; Silva, CM
nationality International
journal JOURNAL OF SUPERCRITICAL FLUIDS
author keywords Chromatography peak broadening method; Cosolvent; Gallic acid; Modelling; Tracer diffusion coefficient; Supercritical carbon dioxide
keywords BINARY DIFFUSION-COEFFICIENTS; CARBON-DIOXIDE; TRANSPORT-COEFFICIENTS; FLUID CHROMATOGRAPHY; PRESSURE RANGE; LENNARD-JONES; DENSE FLUIDS; WIDE RANGES; FREE-VOLUME; SOLUBILITY
abstract The tracer diffusion coefficients, D-12, of gallic acid in liquid ethanol and in supercritical carbon dioxide (SC-CO2) modified with 16 mol.% ethanol were measured using the chromatographic peak broadening technique of Taylor-Axis. The diffusivity in ethanol ranged 0.485 x 10(-5)-0.905 x 10(-5)cm(2).s(-1) (303.15-333.15 K and 1-100 bar) and in SC-CO2/ethanol 3.256 x 10(-5)-4.978 x 10(-5)cm(2).s(-1) (313.15-333.15 K and 150-250 bar). The dependencies of D12 upon temperature, pressure and Stokes-Einstein coordinates were examined in detail. With respect to modelling, lower deviations were achieved in both systems by: four 2-parameter correlations of Magalhaes et al. (error 0.9-3.0%;); the 1-parameter TLSMd model (5.8% and 2.9% of error); and the 2-parameter Dymmond-Hilbrand-Batchinski (DHB) expressions (5.7% and 1.6% of error). The Wilke-Chang correlation cannot be applicable, due to consistent overpredictions of 133.0% (gallic acid/ethanol) and 114.0 % (gallic acid/ SC-CO2/ethanol).
publisher ELSEVIER SCIENCE BV
issn 0896-8446
year published 2018
volume 131
beginning page 130
ending page 139
digital object identifier (doi) 10.1016/j.supflu.2017.09.004
web of science category Chemistry, Physical; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000413390400016
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