Patent ID: 8333811

Claim:
A method comprising refining vegetable oils, cottonseed oil or a mixture of cottonseed oil with other vegetable oils, for the purpose of producing a biofuel, wherein a sequence of treatment steps are performed on crude vegetable oil, including: a) a pre-treatment thereof comprising removal of oil insoluble impurities from the crude oil, b) removal of oil soluble impurities therefrom, c) a free acid neutralization thereof, and d) a drying, bleaching and filtration thereof, wherein an additive is added and wherein ingredients of the composition of said additive is diethyl ether CH 3 CH 2 OCH 2 CH 3 acetone CH 3 COCH toluene CH 3 C 5 H 6 , hexane C 6 H 14 turpentine, methyl alcohol CH 3 OH CH 3 CH 2 OH.