Comparison of Different Compressed Fluids for Residual Oil Extraction from Palm Kernel Cake (original) (raw)

Waste and Biomass Valorization, 2016

Abstract

The recovery of residual oil from palm kernel cake by supercritical carbon dioxide (CO2) and compressed liquefied petroleum gas (LPG) was evaluated. Extractions were carried out in order to investigate how pressure and temperature affect the extraction yield, chemical composition and antioxidant activity of the product. Even though the maximum yield was similar for both solvents (about 9.0 wt%), the extraction rate for compressed LPG was 27 times higher than for supercritical CO2. The steady state for extractions carried out with supercritical CO2 was reached at about 75 min, whereas for compressed LPG this time was much shorter, of 3–4 min. Therefore, compressed LPG represents a better option than supercritical CO2 concerning the extraction of oil from palm kernel cake. Therefore, this solvent can be a promising alternative for fast extractions of vegetable oils at mild operational conditions.

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