Abstract
AbstractAxial backmixing lowers the efficiency of packed countercurrent high‐pressure extraction columns. To quantify backmixing, a method of measuring the residence time distribution and calculating the axial dispersion coefficient in high‐pressure extraction columns is introduced. Using a design of experiments, the effect of supercritical and liquid mass flow rates as well as the pressure at a constant temperature on the mean residence time and the axial dispersion coefficient are evaluated for the system water/supercritical CO2. The experimental data is correlated to the Reynolds and Schmidt number.
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