Method for producing branched biodiesel

A technology for biodiesel and a production method, which is applied in the fields of biofuel, fatty acid production, petroleum industry, etc., can solve the problems of increased production cost of biodiesel, difficult transesterification reaction, large ester group molecules, etc., and achieves improved low-temperature fluidity. , improve the stability, the effect of simple operation

Inactive Publication Date: 2010-06-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high price of branched alcohols will greatly increase the production cost of biodiesel (Energ Fuel, 22(2):1358-1364, 2008), and at the same time, due to the large ester group molecule, the transesterification reaction is not easy to proceed (Trans.ASAE 44 : 1751-1757, 2001), so there is still some difficulty in realizing the industrialization of this method

Method used

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  • Method for producing branched biodiesel
  • Method for producing branched biodiesel
  • Method for producing branched biodiesel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Mix and heat 20 g of methyl soybean oil fatty acid and 2 g of formic acid, heat up to 50° C., add dropwise a mixture of 0.2 g of concentrated sulfuric acid and 9 g of hydrogen peroxide (30%), and finish the reaction after 5 hours. Transfer the reaction mixture to a separatory funnel, take the upper layer liquid, add 30mL of water, wash until neutral, and obtain epoxidized biodiesel. (2) Mix 10g of epoxidized biodiesel with 40g of butanol, add 0.2g of concentrated sulfuric acid, stir and react at 25°C for 7h, add 15mL of 5% Na 2 CO 3 After washing, pour it into a separatory funnel to separate the ester layer, and steam out the low boiling point components to obtain branched biodiesel. The comparison of cloud point and AOM value between branched biodiesel and raw biodiesel is shown in the table

[0025] Table 1 Comparison of cloud point and AOM value between branched biodiesel and raw biodiesel

[0026]

Embodiment 2

[0028] (1) Mix and heat 20g rapeseed oil fatty acid methyl ester and 4g formic acid, heat up to 60°C, add dropwise a mixture of 0.4g concentrated phosphoric acid and 12g hydrogen peroxide (30%), and finish the reaction after 3h. Transfer the reaction mixture to a separatory funnel, take the upper layer liquid, add 25 mL of water, wash until neutral, and obtain epoxidized biodiesel.

[0029] (2) Mix 10g of epoxidized biodiesel with 30g of ethanol, add 0.1g of concentrated sulfuric acid, stir and react at 30°C for 4h, add 20mL of 5% Na 2 CO 3 After washing, it was poured into a separatory funnel to separate the ester layer, and the branched biodiesel was obtained after the low boiling point components were evaporated.

[0030] Table 2 Comparison of cloud point and AOM value between branched biodiesel and raw material biodiesel

[0031]

Embodiment 3

[0033](1) Mix and heat 20g rapeseed oil fatty acid ethyl ester and 4.5g formic acid, heat up to 55°C, add dropwise 0.25g concentrated phosphoric acid, 0.25g concentrated sulfuric acid and 14g hydrogen peroxide (30%) mixed solution, and finish the reaction after 4.5h . Transfer the reaction mixture to a separatory funnel, take the upper layer liquid, add 40 mL of water, wash until neutral, and obtain epoxidized biodiesel.

[0034] (2) Mix 10g of epoxidized biodiesel with 28g of propanol, add 0.15g of concentrated sulfuric acid, stir and react at 40°C for 3.5h, add 30mL of 5% Na 2 CO 3 After washing, it was poured into a separatory funnel to separate the ester layer, and the branched biodiesel was obtained after the low boiling point components were evaporated.

[0035] Table 3 Comparison of cloud point and AOM value between branched biodiesel and raw material biodiesel

[0036]

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Abstract

The invention relates to a method for producing branched biodiesel, which belongs to the technical field of new energy production. The method is characterized in that the method adopts two steps of reaction to convert biodiesel into branched biodiesel. In the epoxidation process, biodiesel is mixed with formic acid, stirred and heated, the mixture of catalyst and hydrogen peroxide is dripped, reacted mixture is transferred into a separating funnel after reaction is finished, the upper layer of liquid is taken and washed by water until becoming neutral, and thereby epoxidized biodiesel is obtained; in the ring-opening reaction, the epoxidized biodiesel is mixed with fatty alcohol, added with catalyst and stirred for reaction, 5 percent of Na2CO3 is added, mixture is washed and then poured into the separating funnel, so that an ester layer is separated out, and after low-boiling point components are evaporated, the branched biodiesel is obtained. The invention improves the oxidative stability and low-temperature fluidity of biodiesel at the same time, has the advantages of low requirement on processing equipment, simple operation, mild reaction condition and the like, and is suitable for industrialized mass production.

Description

technical field [0001] The invention belongs to the technical field of new energy production, and in particular relates to a production method of branched biodiesel. Background technique [0002] The energy shortage caused by rapid economic growth has accelerated the search for new energy sources other than traditional energy sources such as oil and coal. Biodiesel has attracted much attention from the government, academic circles and enterprises because of its advantages of being renewable, green and environmentally friendly, and can be mixed with petrochemical diesel in any proportion. Since its components are saturated fatty acid esters and unsaturated fatty acid esters with one or more double bonds, it has the characteristics of easy oxidation and poor low-temperature fluidity, which also limits the use of biodiesel in low-temperature environments such as aerospace and arctic etc. use. The small molecular aldehydes, ketones, acids and macromolecular polymers produced b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/00C11C3/14C10L1/02
CPCY02E50/13Y02E50/10
Inventor 杨天奎牟英
Owner DALIAN UNIV OF TECH
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