Method for rapidly producing biodiesel from kitchen garbage and produced biodiesel

Abstract

The invention provides a method for rapidly producing biodiesel from kitchen garbage and produced biodiesel. The method comprises the following steps of: (1) carrying out pretreatment: enabling the kitchen garbage to be subjected to sorting, crushing and vacuum dewatering, thereby obtaining hogwash oil; (2) weighing methanol and the hogwash oil in accordance with that the mass ratio of the methanol to the hogwash oil is (50: 100) to (500: 100), and weighing a catalyst in accordance with that the catalyst accounts for 0.05-5% by mass of the oil; (3) dissolving the catalyst in the methanol, and adding the hogwash oil and the methanol where the catalyst is dissolved to an autoclave for reacting for 3-60 min at the temperature of 80-350 DEG C and the pressure of 1-10 MPa; and (4) after the reaction is completed, carrying out reduced-pressure distillation, recovering excessive methanol, and enabling a product to be subjected to standing for layering, wherein a lower layer is glycerine, and an upper layer is the biodiesel. The method provided by the invention has the characteristics of short reaction time, mild reaction conditions and simple product post-processing.

Description

technical field [0001] The invention relates to the field of biodiesel preparation, in particular to a method for rapidly producing biodiesel from kitchen waste. Background technique [0002] Biodiesel is a long-chain fuel obtained by transesterification with methanol, ethanol and other low-carbon alcohols from oil crops such as soybeans, rapeseed, castor, peanuts, and palms, as well as engineering microalgae, animal fats, and waste cooking oil. Fatty acid monoalkyl esters. Biodiesel is a high-quality substitute for petrochemical diesel. The number of carbon atoms in fatty acids that make up biodiesel is mainly concentrated between C16-C18, which is basically the same as the number of carbon atoms in C15-C24 that make up petrochemical diesel, making the two have a relatively similar performance. Using waste cooking oil as a raw material for preparing biodiesel has the characteristics of low raw material cost compared with other raw materials. [0003] Waste cooking oil co...

AI Technical Summary

Problems solved by technology

The chemical catalysis method mainly uses acid or alkali to catalyze the transesterification of oil and alcohol to prepare biodiesel. The liquid acid-base catalysis method has been widely used in industry, but the catalyst is not easy to recover, glycerin is difficult to refine, and post-treatment produces more wastewater. Although the solid acid-base catalytic method can solve the problems of catalyst recovery and wastewater discharge, the reaction rate is low and the reaction time is relatively long

The preparation of biodiesel by biological enzyme catalysis has the advantages of mild conditions, simple separation, and less waste water. However, the cost of enzymes is high and the reaction time is long, so it is difficult to apply on a large scale in industry.

The supercritical transesterification method has the advantages of fast reaction rate, high conversion rate, easy separation and purification of products, etc., but the process requires high temperature and high pressure conditions

The Chinese patent application with the publication number CN101906355A discloses a method for producing biodiesel by using recovered oil from kitchen waste. and other steps are realized, the preparation process of this method is relatively long, and the operation process is relatively loaded down with trivial details

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