Method for producing biodiesel by using solid acid to catalyze waste animal and vegetable oils and fats

Abstract

The invention provides a method for producing biodiesel by using solid acid to catalyze waste animal and vegetable oils and fasts, leftovers of the animal and vegetable oils and fats are taken as raw materials, a sodium bisulfate or zirconium sulfate catalyst and methanol or ethanol are added, and stirring reaction is performed under the conditions that the pressure is 0.2MPa and the temperature is 110-125 DEG C so as to reduce the acid value of a reaction product to below 2mg KOH / g; the residual methanol or the ethanol is recovered, 0.2% of sodium methoxide is further added, and the stirringreaction is performed for 30 minutes at the temperature of 60-65 DEG C; and performing decompression distillation on the reaction product so as to get the biodiesel. The sources of the raw materials are abundant, and the price is low. Compared with the traditional esterification method or the ester exchange method for producing the biodiesel, the process uses the solid acid to replace concentrated sulfuric acid for being used as the catalyst; furthermore, the using quantity of organic base is small, the environmental pollution is small, the equipment corrosivity is small, and the sewage treatment cost is reduced. By adopting the method, not only resources are saved, but also the environmental pollution problem caused by the leftovers generated during refining of vegetable oil at present is eliminated, and waste is further changed to a valuable matter.

Description

technical field [0001] The invention relates to a production method of biodiesel, belonging to the technical field. Background technique [0002] As a safe and clean biofuel, biodiesel is a renewable resource and a typical green energy source. It has the advantages of low toxicity, fast biodegradation, good environmental compatibility, high flash point, and safe storage and transportation. are getting more and more attention. Generally speaking, biodiesel is a mixed fatty acid methyl ester prepared by transesterification of animal and vegetable oils and methanol, and its main components are methyl stearate, methyl palmitate, methyl oleate and linoleum Acid methyl ester etc. [0003] In recent years, with the increasing awareness of environmental protection and the rising price of petroleum products, emulsifiable concentrate preparations have attracted widespread attention due to their high organic solvent content, environmental pressure and cost, and are gradually being us...

AI Technical Summary

Problems solved by technology

However, most microemulsions need to add or use traditional solvents with high toxicity and strong polarity during preparation, which poses threats to human health, the environment and groundwater; therefore, it is imperative to find new green solvents