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Process for co-preparing biodiesel by ultrasonic and microwave

A biodiesel and ultrasonic technology, applied in the preparation of biofuels, biomaterials, liquid hydrocarbon mixtures, etc., can solve the problems of long reaction time, high equipment requirements and high production costs, and achieve high chemical reaction rate and high energy utilization rate. , the effect of low production cost

Inactive Publication Date: 2008-11-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acids and alkalis are usually used as catalysts, which have the disadvantages of high cost, heterogeneous reaction, long reaction time, and high energy consumption. Therefore, people have developed a variety of catalysts such as lipase, heterogeneous solid catalysts, and ionic liquid catalysts. Among them Lipase is easy to deactivate, high cost, and difficult to industrialize; heterogeneous solid catalysts have problems such as low catalytic activity, easy deactivation, and slow reaction rate; and ionic liquid catalysts are high in cost and high in reaction temperature
In addition, supercritical processes and membrane reactors have been developed, while supercritical processes have high requirements for equipment and need to be reacted under high temperature and high pressure; membrane reactors need to consume expensive membrane materials, and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0016] Get 0.023mol of soybean oil and 0.138mol of methanol through removing free fatty acid and dehydration as raw materials, and get 0.2g of potassium hydroxide as a catalyst, put the three into a reactor, and stir them respectively under mechanical stirring (rotating speed 1000 rpm), Ultrasonic, microwave, ultrasonic and microwave act successively, ultrasonic and microwave act simultaneously to carry out transesterification reaction, control reaction temperature 50 ℃, reaction time 15min; the frequency of above ultrasonic wave is 20KHz, power 100W, microwave frequency is 2450MHz, power 300W . After the reaction, the remaining methanol was distilled off. The reaction product is left to stand for stratification, the upper layer is crude biodiesel, and the lower layer is glycerin, water and potassium hydroxide.

[0017] The crude biodiesel was neutralized, washed with water, dried, and continuously distilled under reduced pressure at 220-250°C to obtain high-quality biodiesel...

specific Embodiment 2

[0020] Take 0.023mol lard and 0.69mol ethanol as raw materials, take 0.6g concentrated sulfuric acid as catalyst, put the three into the reactor, and respectively act on it under mechanical stirring (speed 1000 rpm), ultrasonic wave, microwave, ultrasonic wave and microwave 1. The transesterification reaction is carried out under the simultaneous action of ultrasonic waves and microwaves, the reaction temperature is controlled at 65°C, and the reaction time is 2.Oh; the above ultrasonic waves have a frequency of 25KHz and a power of 120W, and the microwaves have a frequency of 2450MHz and a power of 400W. After the reaction is finished, the remaining ethanol is distilled off, and the reaction product is allowed to stand for stratification. The upper layer is crude biodiesel, and the lower layer is glycerin, water and sulfuric acid.

[0021] The crude biodiesel was neutralized, washed with water, dried, and continuously distilled under reduced pressure at 220-250°C to obtain hig...

specific Embodiment 3

[0024] First remove free fatty acid and dehydrate the recovered waste oil, so that the acid value is less than 2mgKOH / g, and the water content is reduced to below 0.05%. Take 0.023mol of the treated waste oil, 0.345mol of methanol, and 1.6g of hydrogen sulfate Pyridine butane sulfonic acid ionic liquid is used as a catalyst, and the three are added to the reactor, and the transesterification reaction is carried out under mechanical stirring (speed 1000 rpm), ultrasonic wave, microwave, ultrasonic wave and microwave successively, and ultrasonic wave and microwave simultaneously. , the reaction temperature is controlled at 70°C, and the reaction time is 3.0h; the frequency of the above ultrasonic wave is 40KHz, the power is 100W, and the frequency of the microwave is 2450MHz, and the power is 300W. After the reaction is finished, the remaining methanol is distilled off, and the reaction product is left to stand for stratification. The upper layer is biodiesel, and the lower layer...

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Abstract

The invention discloses a method for making biological diesel oil by the association of ultrasonic waves and microwaves. The method comprises the following steps: 1. raw oil has free fatty acids removed and undergoes dehydration treatment; 2. mixed liquor of the raw oil, low carbon alcohols and catalysts are put in a reactor and undergo transesterification reaction under the simultaneous actions of the ultrasonic waves and the microwaves; and the mol ratio of the raw oil to the low carbon alcohols is between 1:1 and 1:80, and the mass ratio of the catalysts to the raw oil is between 0.1:100 and 10:100, and the reaction temperature is controlled between 25 and 80 DEG C; 3. after reaction, remained methyl alcohols are evaporated, and reaction products undergo the standing stratification to extract coarse products of the biological diesel oil on the upper layer; 4. the coarse products of the biological diesel oil are purified to obtain the biological diesel oil with high quality. The method has the advantages of high yield, fast reaction speed, short reaction time, low energy consumption, low consumption of the catalysts, low product cost and environmental protection, etc., and is suitable for commercialized production.

Description

technical field [0001] The invention relates to a method for preparing biodiesel, in particular to a method for synergistically preparing biodiesel with ultrasonic waves and microwaves. Background technique [0002] With the depletion of petroleum resources and the deterioration of the ecological environment, environmentally friendly substitutes for petroleum fuels have attracted more and more attention. Biodiesel is a new type of pollution-free and renewable energy. Its combustion performance is comparable to that of petrochemical diesel. The content of harmful substances in the tail gas emitted during combustion is about 50% lower than that of petrochemical diesel. As a raw material, it meets the requirements of sustainable development, so countries around the world raise the development of biodiesel to a strategic level, which is of great significance for maintaining national energy security, sustainable economic development, and environmental protection. At present, the...

Claims

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Application Information

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IPC IPC(8): C10G3/00C11C3/10C11B3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 国伟林王西奎
Owner UNIV OF JINAN
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