A Comparison of Biodiesel Purification Methods

The purification of biodiesel is of cardinal importance to ensure the final product meets industry standards. This final step in the production stage contributes a large portion of the cost attributed to biodiesel production. The aim of this study was to compare four biodiesel purification methods and the energy required to provide a fuel that meets specifications. Major contaminants (water and soap) and fuel properties (oxidative stability) were investigated and compared for the four purification methods. These methods were wet washing with thermal drying and dry washing with MagnesolTM D-Sol, PuroliteTM PD206 and sunflower husk ash. The dry-wash methods proved to be more effective in the removal of contaminants and were less energy intensive than traditional wet washing. Dry washing costs were shown to be significantly lower than for traditional wet washing.