Method for refining biodiesel

Abstract

The invention discloses a method for refining biodiesel, comprising the following steps: (1) after heating animal and vegetable fats to 55 DEG C, mixing the animal and vegetable fats with methyl mixture additives for transesterification; (2) using stack disc separators to separate the semi-finished products of the biodiesel from the products of the transesterification to obtain the semi-finished products of the biodiesel; (3) washing and separating the semi-finished biodiesel a plurality of times and then carrying out film vacuum drying on the washed semi-finished biodiesel, thus obtaining the biodiesel, wherein, the methyl mixture additives are obtained by mixing and then stirring potassium hydroxide and methane. Compared with the current methods for refining the biodiesel, the method ofthe invention is smoother, simpler and more efficient, and enables the production management to become quite easy with the aid of mechanical equipment, thus effectively reducing the production cost.

Description

technical field [0001] The invention relates to a method for refining biodiesel, in particular to a method for converting animal and vegetable oil or discarded edible oil into biodiesel, and belongs to the field of petrochemical industry. Background technique [0002] At present, there are many methods for producing biodiesel, but the basic working principle is to transesterify animal and vegetable oils, that is, to convert triglycerides in animal and vegetable oils into long-refined fatty acid methyl esters, which become suitable as fuel The biodiesel is obtained by washing with water or using biological enzymes to remove the colloid and sucrose alcohol, and finally drying the biodiesel. [0003] Since the biodiesel transesterification process requires more than 6 hours of reaction time, and the next stage of water washing process cannot be carried out before the end of the reaction time, therefore, traditionally, the production process is arranged in batch mode. , need to...

AI Technical Summary

Problems solved by technology

[0003] Since the biodiesel transesterification process requires more than 6 hours of reaction time, and the next stage of water washing process cannot be carried out before the end of the reaction time, therefore, traditionally, the production process is arranged in batch mode. , it takes time to wait

[0004] On the other hand, the process of washing with water or degumming with biological enzymes is usually carried out with a mixer, and the stirring action needs to be carried out slowly until the colloids and fennel alcohol in biodiesel fully contact with water or biological enzymes to complete the washing process. This process also takes time to wait for uniform mixing

[0005] In order to make up for the waiting time, the industry usually needs to increase the capacity of the transesterification reaction tank and the water washing tank, which greatly increases the cost of the equipment and is very unfavorable to investors.

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