The principal character TRANS Transesterification eutrophication that uses a catalytic base is the most popular method because the base price is used, the reaction time is short and ณอัล, is the highest, but khin ester using a catalytic base is limited for oil with high free fatty acids. For example, through the use of vegetable oil or vegetable oil to FRY that have not gone through distillation because of the free fatty acid in the oil will be changed to a new SOAP, by the principal character spot the eutrophication, which is no longer needed and biodiesel production through purification before implementation (and Saka Kusdiana, 2004).
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