Method for synthesizing fatty acid ester by ester exchange reaction

A technology for synthesizing fatty acid esters and transesterification, applied in renewable energy chemical industry and green fields, can solve the problems of complex process, high energy consumption, waste liquid discharge, etc., and achieve good selectivity and stability, mild reaction conditions, High catalytic activity

Inactive Publication Date: 2009-06-17
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] No matter which catalyst is used, the above method has the following disadvantages: complex process, high energy consumption; dark product color, because unsaturated fatty acids in fat are easy to deteriorate at high temperature; esterification products are difficult to recycle and cost high; liquid discharge
[0009] The patent "Biodiesel Synthesis Method Based on Ionic Liquids" (publication number CN1696248A) developed a method of using ionic liquids as catalysts to prepare biodiesel, but in this method, ionic liquids and inorganic acids and bases are combined to obtain better biodiesel Yield, while the reaction time is also very long
In 2006, Chinese patents (CN1737086A, CN1861750A) reported the method of Bronsted acid ionic liquid catalyst catalyzed transesterification to prepare biodiesel, but the reaction required higher temperature and pressure, and there was no investigation on catalyst reusability

Method used

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  • Method for synthesizing fatty acid ester by ester exchange reaction
  • Method for synthesizing fatty acid ester by ester exchange reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a 250ml three-necked flask, add 100g of refined rapeseed oil, 19.92g of methanol, and 0.5% of catalyst a in oil weight according to the alcohol-to-oil molar ratio of 6:1. Heated to 65 ° C full reflux 2h. After the reaction was completed, the mixture was allowed to stand for separation, and the crude fatty acid methyl ester was collected. After washing and drying with water, it was detected by gas chromatography, and the content of the obtained fatty acid methyl ester was 95.1%.

[0032] The crude product is subjected to continuous vacuum distillation at 220-250°C to obtain refined fatty acid methyl ester.

Embodiment 2

[0034]In a 250ml three-necked flask, add 100g of peanut oil, 9.96g of methanol, and catalyst b whose weight is 5% of the oil weight according to the alcohol-to-oil molar ratio of 3:1. Heated to 65 ° C full reflux 2h. After the reaction was completed, the mixture was allowed to stand for separation, and the crude fatty acid methyl ester was collected. After washing and drying with water, it was detected by gas chromatography, and the content of the obtained fatty acid methyl ester was 94.0%.

[0035] The crude product is subjected to continuous vacuum distillation at 220-250°C to obtain refined fatty acid methyl ester.

Embodiment 3

[0037] In a 250ml three-necked flask, add 100g of soybean oil, 33.2g of methanol, and a catalyst c whose weight is 1% of the oil weight according to the molar ratio of alcohol to oil of 10:1. Heated to 80 ° C full reflux 6h. After the reaction was completed, the mixture was allowed to stand for separation, and the crude fatty acid methyl ester was collected. After washing and drying with water, it was detected by gas chromatography. The content of the obtained fatty acid methyl ester was 91.8%.

[0038] The crude product is subjected to continuous vacuum distillation at 220-250°C to obtain refined fatty acid methyl ester.

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Abstract

The invention discloses a method for synthesizing fatty acid ester through ester exchange reaction. The method comprises: adding grease, methanol and ionic liquid catalyst to a reactor, and controlling the reaction temperature to be between 45 and 85 DEG C for the ester exchange reaction for 1 to 10 hours. The method has the advantages of mild reaction condition, wide material applicability, high fatty acid yield, good quality, long service life of the catalyst and the like. Compared with the prior acid-alkali catalyst for industrial use, the catalyst of the method has the advantages of low corrosivity, high catalytic activity, no pollution and repeated use, and has the potential for industrial application.

Description

technical field [0001] The invention relates to the technical field of green and renewable energy chemical industry, and belongs to a method for preparing fatty acid ester, which is the main component of biodiesel, by utilizing animal and vegetable oils, in particular referring to a method for preparing fatty acid ester by using acidic ionic liquid as a catalyst. Background technique [0002] With the dwindling reserves of mineral resources such as petroleum, and the concern of human beings on global environmental issues such as the deterioration of the atmospheric environment quality caused by the burning of fossil fuels, it is necessary to develop and apply new, environmentally friendly and renewable energy sources to replace minerals. Energy is an inevitable trend. [0003] Biodiesel refers to the use of rapeseed, peanut, soybean and other oil crops, oil palm, jatropha, pistachio and other oil forest fruits, engineering microalgae and other oil-bearing aquatic plants, ani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/03C10G3/00B01J31/02
Inventor 李臻夏春谷陈静刘佳梅沈志强于超英
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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