A number of processing techniques were evaluated: 1. ambient filtering; 2. cold filtering; 3. water degumming; 4. absorbent treatment; and 5. vacuum distillation. In each processing technique, the amount of sterol glucosides and glycerin in biodiesel before and after the processing treatment was determined by gas chromatography - flame ionization detector (GC-FID). Moreover, cold flow proprieties, viscosity, acid number, and oxidative stability, flash point, and Cetane number of biodiesel were evaluated.
Developing a cost-effective processing technique to reduce sterol glucosides and glycerin can result in reduced precipitate formation, and minimize filter plugging problems for the automotive fuel delivery system. By improving its quality, biodiesel will become more competitive on the market, and its acceptance to the public will be enhanced.