the present invention provides a robust and efficient process for reducing the cloud point of biodiesel fuel in which clathrates are formed from saturated fatty acid components as solvent is evaporated from a mixture of urea , methanol and fatty acid esters . the process speed can be fast , and is governed by the speed with which urea can be brought into clathrate forming contact with the fatty acid esters in the first instance , and then by the speed that solvent can be evaporated . advantageously , substantially all of the solvent can be evaporated as pure solvent , which enhances process efficiencies and reduces cost . additionally , substantially all of the urea can be used to form clathrates , further maximizing process efficiency .