TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method further comprises: (1) using an esterification process to convert the fatty acid distillate to a second crude biodiesel; (2) using a glycerolysis process to convert the fatty acid distillate to a second refined feedstock; (3) combining the second crude biodiesel with the first crude biodiesel and distilling the first crude biodiesel and second crude biodiesel together in step (c); (4) combining the second refined feedstock with the first refined feedstock and transesterifying the first refined feedstock and second refined feedstock together in step (b); (5) pretreating the feedstock to produce a pretreated feedstock before the free fatty acids are removed from the feedstock and using the pretreated feedstock as the feedstock in step (a); and (6) utilizing the distillation bottoms as a renewable fuel feedstock or as a fuel. The second crude biodiesel is further processed to produce a second purified biodiesel. The second crude biodiesel is processed with at least one of the first refined feedstock and the first crude biodiesel to produce the first purified biodiesel. The first crude biodiesel is refined via at least one of a distillation process and a filtration process to produce the first purified biodiesel. The distillation bottoms are separated from the crude biodiesel during the refining step. Preferred Components: The feedstock contains 0.2-30 wt.% of free fatty acids. The purified biodiesel: exhibits a single inflection point when analyzed for acid number with ASTM D664 method B; has a lower acid number than the first crude biodiesel; has a lighter color than the first crude biodiesel; and has a lower wax content than the first crude biodiesel. The first purified biodiesel has lower sulfur content than the first crude biodiesel. The purified biodiesel has lower unsaponifiable impurities content than the first crude biodiesel. The purified biodiesel has a wax content of less than 0.1 wt.%, an unsaponifiable content of less than or equal to 2 wt.%, a soap content of less than or equal to 50 ppm, a sulfur content of less than or equal to 500 ppm, a monoglyceride content of less than 0.6 wt.%, a cold soak filtration result of less than or equal to 360 seconds or less and a lighter color than the feedstock. The purified biodiesel has a lighter color than the feedstock containing corn oil. EXAMPLE - No suitable example given.