Extraction of solid lanoline from raw wool with near-critical ethanol-modified CO2 —A mass transfer model
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This study deals with the modeling of the extraction of solid lanoline from raw wool under near-critical conditions using 5% ethanol in CO2, using our previous experimental data. A mass-transfer model is developed to explain the extraction results at T¿=¿30¿°C, below the melting point of lanoline (36–42¿°C). Two variables are studied, the extraction pressure and the solvent mass flowrate. Our model depends on three parameters: the solubilities of the two lanoline fractions and the lanoline mass transfer coefficient. The model is a set of first-order partial differential equations, that is solved by orthogonal collocation in combination of optimization of the parameters. The fluid-side mass-transfer coefficient decreases with extraction pressure and is about 5¿×¿10-6 m/s for Re < 1 (at 70–150¿bar) and depends on fluid velocity. The solubilities of lanoline fractions, independent of flowrate, agree very well with those previously reported
CitationValverde, A., Recasens, F. Extraction of solid lanoline from raw wool with near-critical ethanol-modified CO2 —A mass transfer model. "The Journal of supercritical fluids", 1 Març 2019, vol. 145, p. 151-161.
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