Technology for preparing biodiesel by food and beverage waste oil

Abstract

The embodiment of the invention discloses a method for manufacturing biodiesel, which is characterized in that the method comprises the following steps: filtering food and beverage waste oil by an oil filter; then, heating the waste oil for dewatering; carrying out esterification reaction on the pretreated food and beverage waste oil and methanol or ethanol in the existence of catalysts of basic ionic liquid; carrying out distillation for recovering the rest methanol in the reaction; separating the basic ionic liquid catalysts and the glycerin phase in the reaction lower layer liquid to obtain coarse ester; washing obtained materials by hot water to neutral materials after the coarse ester is washed by saturated sodium chloride solution water; and finally, carrying out heating, stirring and dewatering to obtain finished products of biodiesel. The basic ionic liquid catalysts have the molecular formula as the accompanying drawing.

Description

technical field The invention relates to the field of biodiesel production, more specifically, relates to the technology of producing biodiesel from waste cooking oil. Background technique At present, the tense situation in the oil market has put forward a realistic demand for the development of biodiesel. From the perspective of the development of biodiesel at home and abroad, due to the increase in the price of agricultural products worldwide in the past two years, the cost of biodiesel using vegetable oil as raw material has increased. From an economic point of view, it is not feasible to completely replace petroleum diesel with biodiesel in the short term, but it is feasible to use leftovers such as waste cooking oil and acidified oil as raw materials. Converting catering waste oil into biodiesel not only avoids the problem of competing with the public for producing biodiesel directly from vegetable oil, but also eliminates the pollution of this kind of waste to the ecol...

AI Technical Summary

Problems solved by technology

The amount of methanol used in acid catalysis is large, the reaction rate is slow, and acidic waste water is produced. The conditions of alkali catalyzed transesterification reaction are mild. Although a high conversion rate can be obtained in a short reaction time, the content of free fatty acids and water in the raw material oil has an impact on the reaction. Obvious impact, produce alkaline wastewater

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