A Review of Supercritical Technologies for Lipid-Based Biofuels Production: The Glycerol-free Processes

Abstract

Supercritical transesterification of lipid-based biomasses, a recent technique to produce biofuel without a catalyst, is discussed. This review focused on a glycerol-free process. The supercritical reactants include dimethyl carbonate, diethyl carbonate, methyl acetate, ethyl acetate (ETA), and methyl tert-butyl ether. The by-products from the glycerolfree process can improve both the quantity and quality of the resultant biofuel. This review suggests that supercritical transesterification of lipid-based biomasses using ETA as a coreactant can provide the most valuable advantages, as involves inexpensive and renewable resources, which are important for biofuel production and sustainability.