In-situ transesterification of oils was investigated (Harrington and Catherine, 1985; Kildiran et al., 1996). Harrington and Catherine (1985)compared the conventional and in-situ processes and found the acid catalyzed in-situ process for sunflower seed oil was better than that from the more conventional process. Ethyl, propyl and butyl esters of soybean fatty acids were obtained directly, in high yields, by in-situ alcoholysis of soybean oil (Kildiran et al., 1996). By increasing reaction temperature and time and by decreasing the particle size of the soybeans and the water content of ethanol, a purer product was obtained.