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Method for catalyzing alcohol acid esterification using ion liquid

A technology for catalyzing alkyd esters and ionic liquids, applied in chemical instruments and methods, carboxylate preparation, physical/chemical process catalysts, etc., can solve the problem of colored products and corrosion equipment, difficult separation of products and catalysts, and waste acid pollution of the environment and other problems, to achieve the effect of short reaction time, high catalytic efficiency and low dosage

Inactive Publication Date: 2006-12-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Esters have a wide range of industrial applications. Traditional alkyd esterification reactions usually use strong corrosive protonic acids such as concentrated sulfuric acid as catalysts. There are problems such as waste acid polluting the environment, difficult to separate products from catalysts, colored products, and corroding equipment.

Method used

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  • Method for catalyzing alcohol acid esterification using ion liquid
  • Method for catalyzing alcohol acid esterification using ion liquid
  • Method for catalyzing alcohol acid esterification using ion liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: Weigh respectively n-butanol 9.25g (0.125mol), acetic acid 7.50g (0.125mol), ionic liquid N-methylpyrrolidone bisulfate 0.0025mol; ionic liquid, butanol, acetic acid are added successively with In the round-bottomed flask of stirrer, thermometer, reflux condenser, magnetically stirred, and reacted at reflux temperature for 2 hours; The obtained crude product was subjected to vacuum distillation, the conversion rate was 67.8%, and the selectivity was 100%. The ionic liquid is reused after simple dehydration.

Embodiment 2

[0019] Embodiment 2: Weigh respectively 5.75g (0.125mol) of ethanol, 7.50g (0.125mol) of acetic acid, and 0.0005mol of ionic liquid N-methylpyrrolidone sulfate; add the ionic liquid, ethanol, and acetic acid in sequence with a stirrer and a thermometer 1. In the round-bottomed flask of the reflux condenser, magnetically stirred, and reacted at reflux temperature for 0.5 hour; the obtained crude product was subjected to vacuum distillation, the conversion rate was 68.5%, and the selectivity was 100%. The ionic liquid is reused after simple dehydration.

Embodiment 3

[0020] Embodiment three: Weigh methanol 4.00g (0.125mol), acetic acid 7.50g (0.125mol), ionic liquid N-methylpyrrolidone bisulfate 0.000125mol; ionic liquid, methanol, acetic acid are added successively with agitator, In a round-bottomed flask with a thermometer and a reflux condenser, magnetically stir, and react at reflux temperature for 1 hour; the obtained crude product is subjected to vacuum distillation, the conversion rate is 69.2%, and the selectivity is 100%. The ionic liquid is reused after simple dehydration.

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Abstract

This invention discloses a method for catalyzing alcohol acid esterification by using an ionic liquid. The ionic liquid A+B- is used as catalyst and solvent, wherein: A+ has the following structural formula, and R could be an alkyl group or alkene group with more than one carbons; B- is selected from the following negative ions: chlorin, bromine, iodine, acetate, sulfate radical, hydrogensulfate radical, phosphate radical, hydrogen phosphate radical, nitrate radical, tetrafluoroboric radical, hexafluorophosphoric radical, p-toluenesulfonic radical, and trifluoromethanesulfonic radical; the catalyst amount added is 0.01%-50% of the total mole of the alcohol and acid added, reaction temperature 20-140Deg C, normal pressure reaction time 0.5-12h.

Description

technical field [0001] The invention belongs to an organic chemical reaction method, in particular to a method for catalytic alkyd esterification using an ionic liquid. Background technique [0002] Esters have a wide range of industrial uses. Traditional alkyd esterification reactions usually use strong corrosive protonic acids such as concentrated sulfuric acid as catalysts. There are problems such as waste acid polluting the environment, difficult to separate products from catalysts, colored products, and corroding equipment. . Obviously, the society has an urgent demand for new alkyd esterification methods that are environmentally friendly and economically beneficial. Ionic liquids are new materials that have attracted much attention in recent years. They have the advantages of good stability, non-volatility, solubility and adjustable acidity. Deng Youquan (CN1247856) used an ionic liquid in a liquefied state at room temperature composed of nitrogen-containing heteroco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08B01J31/02
Inventor 方岩雄周蓓蕾顾浩张焜
Owner GUANGDONG UNIV OF TECH
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