Background: As an important developing renewable and sustainable energy source,
biodiesel has been consideredaround the world due to its excellent environmental impacts. This paper
discussed the advantages and disadvantages of four different biodiesel production methods.
Method: Compared with the homogeneous catalytic and supercritical methods, the heterogeneous
catalytic and biocatalyst methods would be better choice in the future under the consideration of
environmentalfriendlinessand ease of operation as well as high reaction activity for the catalytic
Results: This paper also reviewed the biodiesel upgrading technologies for promotingits commercial
industrial applications. In addition to be directly used as additives for light fuels and solvents of
chemical products, the free of oxygen biofuels, alkanes, and epoxy compounds could be further
produced from biodiesel via hydrotreating process, electrochemical synthesis and epoxidation
Conclusion: All these upgrading and refining technologies not only could resolve the poor lowtemperature
properties of biodiesel, but also deeply promote the biodiesel commercial industrial
application and its sustainable development.