Device and method for producing biodiesel with illegal cooking oil and waste engine oil

Abstract

The invention provides a device and a method for producing biodiesel with illegal cooking oil and waste engine oil. The device comprises an illegal cooking oil settling tank, a waste engine oil settling tank, a mixer, a heat exchanger, a tower-type fixed bed reactor, a condensing system, a gas storage tank, a diesel tank and a gasoline tank, wherein the mixer is connected with the heat exchanger; the heat exchanger is connected with the lower part of the tower-type fixed bed reactor through a preheater; and the condensing system is connected with the heat exchanger. The method comprises the following steps: pretreating, performing catalytic cracking reaction and collecting a product. The produced biodiesel is light yellow in color, has the condensing point of about minus 5 DEG C, has good low temperature fluidity, has a heat value far higher than that of the conventional biodiesel, and has stable product quality; environment pollution is reduced, and a decoloring step is not required; the tower-type fixed bed reactor is applied to the catalytic cracking reaction, so that the method has the advantages of convenience in heating, small investment, easiness in control of treatment amount and low operating cost; and a catalyst can be recycled, so that the device and the method are suitable to be popularized and applied.

Description

technical field [0001] The invention belongs to the field of biodiesel preparation, and in particular relates to a device and method for preparing biodiesel from waste oil and waste engine oil. Background technique [0002] Biodiesel usually refers to fatty acid methyl or ethyl ester, which uses various animal and vegetable oils as raw materials, undergoes transesterification with alcohols such as methanol or ethanol, and finally becomes a fuel for internal combustion engines. Compared with petrochemical diesel, this type of biodiesel has obvious disadvantages: 1) high viscosity and poor fluidity. 2) The power is reduced by 8%-10%. The calorific value of biodiesel and petrochemical diesel is 32.8:35.7, that is, under the same quality, the power is about 92% of petrochemical diesel. 3) Due to the large molecular weight and high viscosity of biodiesel, the injection schedule is affected, resulting in poor injection effect. The production technology of this type of biodiesel ...

AI Technical Summary

Problems solved by technology

Compared with petrochemical diesel, this type of biodiesel has its obvious disadvantages: 1) high viscosity and poor fluidity

3) Due to the large molecular weight and high viscosity of biodiesel, the injection schedule is affected, resulting in poor injection effect

The production technology of this type of biodiesel mainly adopts acid-base two-step catalytic method, which must be washed with acid-base water, which will inevitably produce a large amount of waste water and saponification, and the processing steps are cumbersome

If methanol or glycerin is not completely separated and brought into biodiesel, the quality of biodiesel will be seriously reduced, and the diesel engine will be damaged to some extent.

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