Abstract: It is not justifiable to use excess of water to purify biodiesel only because it is the "most economical" method. Actually it is one of the problems in the biodiesel production industry an adequate purification method; the most commonly used one is the water washing. Currently, there is considerable interest in the biodiesel purification with other solid materials such as synthetic magnesium silicate, which is an effective absorbent to remove impurities. The two methods discussed here have been tested in similar conditions of temperature, time and concentration of reactants. It was found that it is very important to remove the remaining methanol to avoid saturation of the absorbent. The analysis concluded that residues of glycerol and soap content in the two processes are similar and efficient enough and did not find many differences. The purity requirements and analysis of biodiesel were based on the American standard ASTM D6751
By-products from the vegetable oil industry as a feasible source for biofuels production and pollution reduction R. Piloto-Rodriguez1, E. A. Melo1, I. Tobio2, L. Goyos1 and S. Verhelst3
Abstract.Biodiesel produced from by-products and waste materials can be an economical way for reducing the traditional oil consumption and environmental problems. The by-products from the refining vegetable oil industry such as soapstock, acid oil and fatty acid distillates are suitable for producing biodiesel. The present work is an approach to the use of these by-products to obtain biodiesel covering the traditional and most widely used acid/base catalysis. The advantages and drawbacks of the different methods are mentioned and analysed. The synthesis and use of by-products from the vegetable oil refining industry are covered in this work.