Abstract
The aim of this work was to develop a new process for extraction and separation of polar and nonpolar compounds from natural materials using supercritical CO2 (SCCO2) in water. In this work, chlorogenic acid and caffeine from coffee beans were used as model compounds of polar and nonpolar compounds, respectively. Extraction and separation were conducted in three types of semicontinuous extractors with different sizes and flow types of CO2 and water. The effect of temperature and pressure in the separation mode using SCCO2 in flow and water in batch mode has been reported. Recovery of caffeine in the SCCO2 phase increased with decreasing temperature and increasing pressure. However, only the increasing pressure could promote the increasing recovery of caffeine and chlorogenic acid in water phases. The change of height of the nonpolar recovery section on the recovery of caffeine and chlorogenic acid in SCCO2 and water phases and on the separation factor has been studied using SCCO2 and water in co-current a...
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