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Method for producing -5 DEG C biodiesel by using drainage oil or waste cooking oil

A technology of biodiesel and waste oil, which is applied in the fields of biofuel, petroleum industry, and fat production, can solve the problems of high sulfuric acid concentration, pollute the environment, affect product yield, etc., and achieve high catalytic activity, few side reactions and low price. Effect

Inactive Publication Date: 2013-06-12
姬大菊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong oxidizing, corrosive and dehydrating properties of concentrated sulfuric acid, there are the following disadvantages in using it as a catalyst: (1) in the process of esterification, the concentration of sulfuric acid is large, which makes the reactants dehydrate, oxidize and carbonize themselves, etc. Side reaction, resulting in darker product color
Especially when the esterification reaction is carried out at a higher temperature, the unsaturated bonds on the oil chain are added to concentrated sulfuric acid, and even carbonized, resulting in by-products such as dolic alcohol, ether, sulfuric acid ester and carbonyl compounds in the reactant , to generate a certain amount of asphaltene, which brings certain difficulties to the product distillation, affects the yield of the product, and also seriously affects the quality of the product
(2) The catalyst cannot be recycled and reused. It stays in the reactant, and after neutralization and water washing to remove acid impurities, it will produce "three wastes" and pollute the environment
(3) Using concentrated sulfuric acid as a catalyst severely corrodes process equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] (1) Esterification: Coarsely filter the waste oil and vacuum dehydrate (80-90°C); take 3000g of waste oil with an acid value of 89.56mgkoh / g, add it to a 5000ml steel reaction kettle, and add it under stirring to obtain 0.1% waste oil quality The neutral catalyst is at least 3g of aluminum triphenoxide, aluminum isopropoxide, titanium tetrabutoxide, aluminum tert-butoxide, and titanium salt of 2-propoxide, and then added as waste oil quality 6% glycerol 180.00 g, stirring, heating and heating, the temperature of the reaction solution is controlled at about 110-240°C, the negative pressure is controlled at -0.05MPa to -0.092MPa, and the esterification is complete; the acid value of the reaction solution is reduced from 89.56mgkoh / g to 0.59mgkoh / g in 2.5h g, cooling to terminate the reaction.

[0019] (2) Transesterification: the above-mentioned esterification solution is cooled to less than 80° C., and under stirring, 450 g of methanol 450 g of 15 percent of the quality ...

example 2

[0024] (1) Esterification: coarsely filter hog oil, vacuum dehydrate (80-90°C); take 3000g waste oil with an acid value of 19.58mgkoh / g, add it to a 5000ml steel reaction kettle, and add it under stirring to obtain 0.06% waste oil quality The neutral catalyst is at least 1.8g of aluminum triphenoxide, aluminum isopropoxide, titanium tetrabutoxide, aluminum tert-butoxide, and titanium salt of 2-propoxide, and then add 1.3% glycerin as waste oil quality 49.00g, stirring, heating up, the temperature of the reaction liquid is controlled at about 130-240°C, the negative pressure is controlled at -0.06MPa to -0.093MPa, fully esterified; the acid value of the reaction liquid is reduced from 19.58mgkoh / g to 0.29mgkoh in 1.5h / g, the temperature was lowered to terminate the reaction.

[0025] (2) transesterification: the above-mentioned esterification liquid is cooled to 82 ℃, under stirring, add 450 g of methanol 450 g of the quality of the esterification liquid and a metal compound o...

example 3

[0030] (1) Esterification: Coarsely filter the waste oil and vacuum dehydrate (80-90°C); take 3000g of waste oil with an acid value of 89.56mgkoh / g, add it to a 5000ml steel reaction kettle, and add it under stirring to obtain 0.1% waste oil quality The neutral catalyst is at least 3g of aluminum triphenoxide, aluminum isopropoxide, titanium tetrabutoxide, aluminum tert-butoxide, and titanium salt of 2-propoxide, and then added as waste oil quality 6% glycerol 180.00 g, stirring, heating and heating, the temperature of the reaction solution is controlled at about 180-240°C, the negative pressure is controlled at -0.07MPa to -0.089MPa, and the esterification is complete; the acid value of the reaction solution is reduced from 89.56mgkoh / g to 0.59mgkoh / g in 2.5h g, cooling to terminate the reaction.

[0031] (2) transesterification: the above-mentioned esterification liquid is cooled to less than 50 ℃, under stirring, add 15% methanol 450g of the esterification liquid quality an...

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Abstract

The invention discloses a method for producing -5 DEG C biodiesel by using drainage oil. The method comprises the following steps of: 1, pretreatment; 2, esterification; 3, ester exchange; and 4, dealcoholization and simple distillation. According to the method, the IVB group and IIIA group metal-organic compounds serving as efficient environment-friendly economic catalysts are adopted, and are mainly characterized by high catalytic activity, neutrality and no corrosion on reaction equipment, the usage amount of the metal-organic compounds only accounts for 0.05-0.5% of the mass of the drainage oil or waste cooking oil, few side reactions happen, the yield of fatty acid methyl ester is high (above 92%), the methanol consumption is low (below 12%), no residues are generated, the product has light color and luster and good quality, no 'three wastes' (waste gas, waste water and industrial residual) are generated, and pollution is avoided. Compared with a conventional acid catalyst method, the method has the advantages that the yield of the product is increased by 5-7%, the condensation point is reduced by above 10 DEG C, and the color and luster of the product are light yellow and bright.

Description

technical field [0001] The invention relates to the technical field of renewable resource recycling and biodiesel, in particular to a method for producing low freezing point biodiesel-fatty acid methyl ester by using waste oil or hogwash oil under the action of a neutral catalyst. Background technique [0002] Biodiesel, also known as fatty acid methyl ester, is a new type of fuel produced by processing animal and vegetable oils. Its cetane number and other indicators are similar to those of petrochemical diesel, and it is a renewable energy source. With the worldwide energy shortage and people's increasing emphasis on environmental protection, it is imminent to develop and research biodiesel, a green and environmentally friendly fuel, to replace the depleted fossil energy. [0003] It is precisely because biodiesel has the characteristics of renewability, environmental protection and substitutability that it has attracted great attention from many countries in the world and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04C11C3/10C11B3/00C10L1/02
CPCY02E50/10
Inventor 姬大菊李吉王娇许明玉王铜玮
Owner 姬大菊
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