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Method for preparing biodiesel by gemini ionic liquid catalyst

A technology of ionic liquid and biodiesel, which is applied in chemical instruments and methods, preparation of organic compounds, physical/chemical process catalysts, etc., can solve problems such as complex operation and long post-treatment process, and achieve good atomic economy and wide range of reaction raw materials , The effect of recycling catalyst activity

Inactive Publication Date: 2014-03-26
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ionic liquids have advantages that other traditional catalysts do not have. It has both the high-density reactive sites of liquid acids and the non-volatility of solid acids. The acidity can exceed that of solid superacids and can be adjusted as needed. The catalyst and product are easily separated. Therefore, it has attracted much attention in the preparation of biodiesel. However, in recent years, most studies have used ionic liquids for pre-esterification of high-acid value oils, and there are still problems such as complicated operations and long post-treatment processes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] 1) Preparation process of acid-functionalized gemini ionic liquid: Dissolve 16.8 parts by mass of sodium hydroxide in 126 parts by mass of ethanol, add 17.6 parts by mass of N,N'-dimethylethylenediamine, heat to 80°C, Add 50 parts by mass of dodecane bromide dropwise, after the dropwise addition is complete, keep warm for 48 hours, filter, evaporate the solution to remove ethanol, dissolve it with 80 parts by mass of acetone, filter the insoluble matter, and evaporate the solvent. Obtain white waxy solid bis(methyldodecyl)ethylenediamine; take 42.5 parts by mass of bis(methyldodecyl)ethylenediamine, dissolve in 40 parts by mass of acetone, heat to 60°C, Add 26.9 parts by mass of 1,3-propane sultone dropwise. After the dropwise addition, keep warm for 48 hours, filter, wash the filter cake with acetone, and dry it in vacuum at 80°C for 5 hours to obtain a yellow solid bis(methyl Dodecylsulfopropyl) ethylene bis-quaternary ammonium salt; get 33.4 parts of quality bis (met...

Embodiment 1

[0034] Example 1: Put 1.6 grams of Gemini ionic liquid di-p-toluenesulfonate on behalf of bis(methyldodecylsulfonate propyl) ethylene bisquaternary ammonium salt, 22.3 grams of oleic acid, and 3.8 grams of methanol into the reaction flask In, stirring, heating, esterification temperature 40-80 ℃. After reacting for 4 hours, the reaction solution was allowed to stand and separated into layers, the upper layer of the reaction solution was poured out, methanol was evaporated, and the conversion rate of oleic acid was 93.5%.

Embodiment 2

[0035] Example 2: Put 1.6 grams of Gemini ionic liquid di-p-toluenesulfonate on behalf of bis(methyldodecylsulfonate propyl) ethylene bisquaternary ammonium salt, 22.3 grams of oleic acid, and 5.4 grams of ethanol into the reaction bottle In, stirring, heating, esterification temperature 40-80 ℃. After reacting for 4.5 hours, the reaction solution was left to stand and separated into layers, the upper layer of the reaction solution was poured out, and the ethanol was evaporated, and the conversion rate of oleic acid was 91.7%.

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PUM

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Abstract

A method for preparing biodiesel by a gemini ionic liquid catalyst comprises the steps: A) taking an acid functionalized gemini ionic liquid as the reaction catalyst, and catalyzing a fatty acid and a short chain alcohol to undergo a reaction at the temperature of 40 to 80 DEG C for 3 to 6 hours, wherein the molar ratio of the fatty acid to the short chain alcohol is 1:1 to 1:4, and the mass ratio of the acid functionalized gemini ionic liquid to the reactants is 1:20 to 20:1; and B) layering the reaction liquid prepared in the step A, reducing the pressure of the supernatant liquid to remove the short chain alcohol, and thus obtaining the product, wherein the acid functionalized gemini ionic liquid is composed of a sulfonic acid group functionalized gemini alkyl amine salt cation and an inorganic or organic anion. The method has no environmental pollution and belongs to the environmental friendly technology.

Description

technical field [0001] The invention relates to a method for catalyzing an esterification reaction with a double-functionalized gemini ionic liquid, in particular to a method for cleanly producing biodiesel. Background technique [0002] The dwindling of petroleum resources has led to energy shortages and soaring petroleum prices, making people pay more and more attention to the substitutes of petroleum fuels. The development of biodiesel using renewable resources is a petroleum energy substitute that has attracted much attention in recent years. It is very important to alleviate the global energy shortage. It is of great significance to reduce environmental pollution. At present, foreign countries mainly use rapeseed oil or soybean oil as raw material to produce biodiesel by transesterification method. Due to China's large population and relatively scarce arable land, the cost of producing biodiesel from edible oils such as rapeseed oil and soybean oil is too high, which d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/58C07C69/24C10L1/02B01J31/02
CPCC07C67/08C10L1/02C11C3/08C07C69/58C07C69/24Y02E50/10
Inventor 常涛袁明霞张广清边丽何乐芹郑仕兵
Owner HEBEI UNIV OF ENG