It was found that the floc sizes of glycerol and its settling efficiency for the mixture of the used vegetable and animal fats biodiesel increased if the amount of methanol is increased.
The yield corresponding to the optimum amount of methanol used for the all different oils are summarized in the last column of Table 1. Under these conditions, soybean oil appears to be the best oil for producing biodiesel fuel having a high yield together with efficient settling of the by-products.