Patent ID: 7520905

Claim:
A method to increase biodiesel oil content with additives derived from a biomass, which comprises: Providing biomass, and providing aqueous sulfuric acid, and providing biodiesel oil, and combining said biomass with said sulfuric acid for hydrolysis to form sugars within a hydrolysate, and subjecting sugars to dehydration to form furfural and hydroxymethylfurfural, and splitting the heterocyclic ring within said hydroxymethylfurfural to form levulinic acid, and extracting said furfural and said levulinic acid from said hydrolysate by said biodiesel oil, and recycling hydrolysate resulting from extraction of levulinic acid and furfural for hydrolysis of additional biomass, thereby biodiesel oil content is increased by additives derived from a biomass.