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Method for preparing biodiesel under catalysis of ionic liquid

A technology of ionic liquid and biodiesel, applied in chemical instruments and methods, preparation of organic compounds, preparation of liquid hydrocarbon mixtures, etc., can solve the problems of limiting the application of ionic liquids, complex synthesis process, and difficult purification, and achieve low cost, The effect of simple catalytic system and simple process

Inactive Publication Date: 2012-12-05
XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned functionalized ionic liquids have high activity, the synthesis process is complicated, the purification is difficult, and the cost is high, which greatly limits the application of ionic liquids.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 14.1 g (50 mmol) of oleic acid, 3.2 g (100 mmol) of methanol, and 1.43 g (5 mmol) of 1-butyl-3-methylimidazolium p-toluenesulfonate, respectively, and add them into the stirring autoclave, The reaction was stirred at 120°C and 200 r / min for 5 h, and the esterification rate was 95.7%. The reaction solution is distilled under reduced pressure to recover methanol, and the remaining liquid phase is divided into two layers after standing still, the upper layer is fatty acid methyl ester, that is, biodiesel, and the lower layer is ionic liquid. Wash the biodiesel with 20 ml of hot water at 70°C, let stand or centrifuge to separate layers, and take the upper oil phase and vacuum distillation to obtain a refined biodiesel product. ionic liquid through 90 o C was distilled and dried under reduced pressure for 12h.

Embodiment 2

[0032] Weigh 14.1 g (50 mmol) of oleic acid, 4.6 g (100 mmol) of ethanol, and 1.43 g (5 mmol) of 1-butyl-3-methylimidazolium p-toluenesulfonate, respectively, and add them into the stirring autoclave, The reaction was stirred at 120°C and 200 r / min for 5 h, and the esterification rate was 88.3%. The reaction solution is distilled under reduced pressure to recover ethanol, and the remaining liquid phase is divided into two layers after standing still, the upper layer is fatty acid methyl ester, ie biodiesel, and the lower layer is ionic liquid. Wash the biodiesel with 20 ml of hot water at 70°C, let stand or centrifuge to separate layers, and take the upper oil phase and vacuum distillation to obtain a refined biodiesel product. ionic liquid through 90 o C was distilled and dried under reduced pressure for 12h.

Embodiment 3

[0034] Weigh 14.1 g (50 mmol) of oleic acid, 6.0 g (100 mmol) of propanol, and 1.43 g (5 mmol) of 1-butyl-3-methylimidazolium p-toluenesulfonate, respectively, and add them to the stirred autoclave , the reaction was stirred at 120°C and 200 r / min for 5 h, and the esterification rate was 73.2%. The reaction solution is distilled under reduced pressure to recover propanol, and the remaining liquid phase is divided into two layers after standing still, the upper layer is fatty acid methyl ester, ie biodiesel, and the lower layer is ionic liquid. Wash the biodiesel with 20 ml of hot water at 70°C, let stand or centrifuge to separate layers, and take the upper oil phase and vacuum distillation to obtain a refined biodiesel product. ionic liquid through 90 o C was distilled and dried under reduced pressure for 12h.

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Abstract

The invention discloses a method for preparing biodiesel under catalysis of ionic liquid. The method comprises the following steps of: mixing the ionic liquid, short-chain alcohol and free fatty acid or high-acid-value oil and fat to perform a reaction at a certain temperature; and synthesizing fatty acid methyl ester, namely the biodiesel or synthesizing the biodiesel by a two-step method. The conventional ionic liquid is low in cost and the activity of the ionic liquid is obviously improved within the limited reaction temperature range, so the ionic liquid can be separated, recovered and reused easily after the reaction is finished. The method has the characteristics of simple catalytic system, reusability and simple process.

Description

Technical field [0001] The present invention is a new energy production technology field, which is specifically involved in a method of catalysis of ionic liquid to prepare biological diesel. Background technique [0002] Entering the 21st century, my country's economy has developed rapidly, the process of industrialization and urbanization has accelerated, energy demand has grown rapidly, and the contradiction between energy supply and demand is increasingly prominent.According to the National Institute of Energy of the National Development and Reform Commission, the demand for oil in 2020 will be 4.5 to 610 million tons. At that time, the domestic oil production is estimated to be 180 million tons, and the import volume will be 2.7 to 430 million tons.Reach 60-70%.my country's biological diesel industry starts late and develops slowly. In 2009, global biological diesel production reached 18 million tons, but my country's output was only hundreds of thousands of tons, and the ut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/08C10G3/00C11C3/04C11C3/10C10L1/02
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 郭峰方真
Owner XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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