Introduction
Rapid growth in population coupled with industrial and technological developments have been leading towards the depletion of limited fossil fuel resources of the world. Currently,research is progressively more directed towards exploration of alternative renewable fuels. Biodiesel, an alternative diesel fuel, is a promising, non-toxic and
ecofriendly clean fuel. Biodiesel (fatty acid alkyl ester) is produced by transesterifying triglycerides, from vegetable oils or animal fats with an excess alcohol, usually methanol, in the presence of a catalyst, usually a strong base such as sodium or potassium hydroxide. Soap is formed as a by-product and separated from the biodiesel in the production process. Soap is especially important. Moreover, soap is especially undesired in the fuel because it blocked fuel filter in engine. To eliminate this problem, the use of waterless process becomes an important role in removing biodiesel contaminants then conventional water washing could be replaced by using adsorbents