Method for preparing biodiesel

Abstract

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.

Description

technical field [0001] The invention relates to the field of biological energy, in particular to a method for preparing biodiesel by using leftovers from aquatic organism processing. Background technique [0002] Biodiesel is one of the important forms of bioenergy development. At present, the raw materials for biodiesel production at home and abroad are mainly plant and terrestrial animal oils, among which rapeseed oil is mainly used in Europe and Asia, soybean oil is mainly used in the United States, and castor oil is developed in Brazil. Vegetable oil is the traditional edible oil in our country. Although our country has made remarkable achievements in the cultivation of oil plants, the output of soybeans, peanuts, sunflower seeds, rapeseed and other oil crops is not enough to meet the needs of the domestic edible oil consumption market. In recent years, the import of edible oil has been increasing year by year. In 2004, my country’s edible oil import was close to 7 milli...

AI Technical Summary

Problems solved by technology

The leftovers of fish processing enterprises are mainly fish heads, fish bones, fish skins and viscera, etc. The treatment of aquatic product processing leftovers is a common problem in aquatic product processing enterprises. The existing treatment methods often cause pollution to the environment and use of active ingredients It is difficult to create high value and cause huge waste. Many companies sell it as waste, and the price is low, which affects the economic benefits of the company.