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Production method of diesel oil by supersonic methanol esterification

A biodiesel and ultrasonic technology, applied in the preparation of biological raw materials, liquid hydrocarbon mixtures, petroleum industry, etc., can solve the problems of difficult recovery, short service life of enzymes, waste lye discharge, etc., to simplify the production process and production costs, Improve the conversion rate and avoid the effect of pollution

Inactive Publication Date: 2008-07-23
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the following disadvantages: 1. acid (or base) catalyst recovery is difficult; 2. the content of free fatty acid and water has a great influence on acid (or base) catalyzed reaction; Advanced alcohol recovery device, high energy consumption; ④ deep color, because unsaturated fatty acids in fat are easy to deteriorate at high temperature; ⑤ esterification products are difficult to recycle, high cost; ⑥ waste lye is discharged during the production process
But this method also has following problems: 1. in order to reach high transesterification rate, must use organic solvent, causes pollution; 2. short-chain alcohols such as methyl alcohol in reaction system have certain toxicity to enzyme, and the service life of enzyme is short , and the reproducibility of lipase is not high; ③ the catalytic effect of lipase on methanol and ethanol is not as effective as the esterification or transesterification of long-chain fatty alcohols, and the conversion rate of short-chain fatty alcohols is low, generally only 40% to 60%; ④The price of the enzyme is high; ⑤The reaction time is long; ⑥The by-products glycerin and water are difficult to recover, which not only inhibits the formation of the product, but also shortens the service life of the immobilized enzyme
Although this method simplifies the problem of difficult separation of traditional transesterification reaction products, and also solves the problem of too long reaction time in the conventional catalyst-free methanol esterification method, the process is complicated, the equipment is huge, and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a conventional reaction vessel welded by a stainless steel plate equipped with an ultrasonic vibrator, methanol and waste oil are mixed in a molar ratio of 30:1, the temperature is controlled at 60°C, and the motor drives the stirrer to stir at a speed of 1500r / min. Promote the uniform mixing of methanol and raw oil; turn on the power of the ultrasonic generator, adjust the ultrasonic frequency generated by the ultrasonic vibrator to 30kHz, and the power to be 2kw. The ultrasonic waves emitted by the ultrasonic vibrator will produce cavitation, heating and high-frequency oscillation in the reactant It can increase the activity of the reactants, promote the formation of free radicals in the reactants and the occurrence of cracking reactions, and make the molecules of the reactants collide strongly with each other, so as to accelerate the complete chemical reaction of methanol esterification to produce biodiesel. , after carrying out the transesterification reaction for...

Embodiment 2

[0024] In the reaction vessel described in Example 1, methanol and animal waste fat were mixed in a molar ratio of 20:1, at 40°C, with a stirring speed of 1800r / min, ultrasonic power of 5kw and ultrasonic frequency of 20kHz, for 1.5 hour transesterification reaction. The reacted mixed solution was left to stand for 12 hours, the mixed solution was separated into layers, and the glycerol in the lower layer was separated; the upper mixed solution was distilled at 100° C. until all the methanol was recovered, and the remaining distillate was biodiesel.

Embodiment 3

[0026] In the reaction vessel described in Example 1, methanol and waste cooking oil from the catering industry are mixed in a molar ratio of 50:1, at 64°C, stirring speed 2000r / nin, ultrasonic power is 10kw and ultrasonic frequency 60kHz. 1 hour transesterification reaction. The reacted mixed solution was left to stand for 10 hours, the mixed solution was layered, and the glycerin in the lower layer was separated; the upper mixed solution was distilled at 80° C. until all the methanol was recovered, and the remaining distillate was biodiesel.

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Abstract

Production of supersonic methanol esterification is carried out by taking refuse grease as raw material, having cavitation, heating, high-frequency oscillating, and accelerating methanol esterification to prepare final product. It is cheap and convenient, has better reactant activity and higher percent conversion and no environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing biodiesel through methanol esterification using ultrasonic waves, in particular to a method for producing biodiesel by using various animal waste fats, waste cooking oil in the catering industry, waste oil and other waste oils as raw materials, and producing biodiesel through ultrasonic waves. A method for preparing biodiesel by accelerating methanol esterification through chemical reaction, heating and high-frequency oscillation. Background technique [0002] Biodiesel is a new type of fuel produced from animal and vegetable oils. According to the analysis of chemical composition, biodiesel fuel is a kind of high fatty acid methane, which is obtained by the decomposition of glycerolipid with unsaturated oleic acid C18 as the main component. Compared with conventional diesel, biodiesel is superior to ordinary diesel in terms of cold filter point, flash point, combustion efficiency, sulfur content, oxygen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00
CPCY02P30/20
Inventor 纪威姚亚光符太军张传龙
Owner CHINA AGRI UNIV
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