The invention discloses a method for preparing biodiesel by using aquatic product processing scraps, which comprises the following steps : (1) boiling the cleaned fish processing scraps to between 100 and 120 DEG C, then adding an organic solvent into the scraps, and stirring and filtering the scraps to obtain solution I; (2) adding aqueous of phosphoric acid in an amount of 20 to 50 percent basedon the volume of the solution I into the solution I to obtain solution II, adding water with the same volume as the solution II into the solution II, carrying out acid washing and water washing, and dehydrating the solution II through a polyhydroxy water absorbent resin column to obtain solution III; (3) adding an alkali catalyst and anhydrous ethyl alcohol into the solution III to carry out transesterification reaction so as to obtain solution IV; and (4) standing the solution IV, removing a lower glycerine layer, then washing the generated mixed fatty acid ethyl ester layer by water, and removing the residual catalyst, the ethyl alcohol and other water soluble components to obtain the biodiesel. The method has the advantages of making full use of the prior fish processing scraps, reducing the pollution, improving the economic benefit of enterprises, and developing a new path for the utilization of aquatic product processing wastes and the development of biological energy.
修改评论