Abstract
This study mainly aims to correlate the effect of high-pressure CO2−Water slug flow formed by microfluidic mixing on the extraction of phenolic compounds (gallic acid, protocetechuic acid, cafeic acid, syringic acid, ferulic acid, and benzoic acid) from its multi-component aqueous solutions. Both slug flow observation and extraction performances were experimentally conducted at different CO2 flow rates (100–650) ml min−1, temperatures (25–60) oC, and pressures (8.0–20.0) MPa. The slug flow patterns are affected by all CO2 flow rates, temperatures, and pressures. The slug flow patterns have a strong correlation with the extraction efficiencies of phenolic compounds from the aqueous solutions. Using slug flow process, benzoic acid can be completely purified from the multi-component aqueous solutions by supercritical CO2 extraction.
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