Method for catalyzing alcohol acid esterization by acidic ion liquid

A technology of acidic ionic liquid and catalyzed alkyd ester, which is applied in the direction of chemical instruments and methods, preparation of carboxylate, physical/chemical process catalyst, etc., can solve the problems of insufficient stability of repeated use, insufficient stability of water and air, etc., and achieve The effect of low vapor pressure, high conversion rate, and simplified separation process

Inactive Publication Date: 2007-08-29
GUANGDONG UNIV OF TECH
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  • Abstract
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Problems solved by technology

Deng Youquan et al. (CN1247856) used alkylpyridines, ionic liquids made of nitrogen-containing heterocompounds such as pyrimazoles and metal or non-metallic halides as catalysts and solvents for the esterification of alcohols and acids, and realized alkyd esterification reactions, but this There are shortcomings such as insufficie

Method used

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  • Method for catalyzing alcohol acid esterization by acidic ion liquid
  • Method for catalyzing alcohol acid esterization by acidic ion liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Weigh 0.1 mol of acetic acid, 0.1 mol of ethanol, and 0.1 mol of ionic liquid α-pyrrolidone hydrogen sulfate; add the ionic liquid, ethanol, and acetic acid to a round bottom flask with a stirrer, a thermometer, and a reflux condenser. , Magnetic stirring, and heating and refluxing reaction at 80°C for 0.5 hours; standing for stratification, removing the upper esterification product, the conversion rate is 90.3%, the selectivity is 100%; the ionic liquid is repeatedly used after vacuum dehydration.

Embodiment 2

[0026] Example 2: Weigh 0.1 mol of acetic acid, 0.1 mol of n-butanol, and 0.02 mol of ionic liquid α-pyrrolidone nitrate; add the ionic liquid, n-butanol, and acetic acid to a circle with a stirrer, a thermometer, and a reflux condenser. It was placed in a bottom flask and reacted with magnetic stirring at 100°C for 1 hour; stood still for layering, and removed the upper esterified product, the conversion rate was 75..8%, the selectivity was 100%; the ionic liquid was vacuum dehydrated and reused.

Embodiment 3

[0027] Example 3: Weigh 0.1 mol of acetic acid, 0.1 mol of n-heptanol, and 0.01 mol of ionic liquid α-pyrrolidone hydrochloride; add the ionic liquid, n-heptanol, and acetic acid to a mixer with a stirrer, a thermometer, and a reflux condenser. In a round-bottom flask, magnetically stirred and reacted at 140°C for 2 hours; stand still for layering, and remove the upper esterification product, the conversion rate is 71.7%, the selectivity is 100%; the ionic liquid is vacuum dehydrated and reused.

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Abstract

The invention relates to a hydroxy acid esterification method that is catalyzed by acid ion liquid. It adopts alpha-pyrrolidone positive ion and ion liquid formed by inorganic or organic ion as catalyst, solvent, and dehydrating agent, the ion liquid quantity is 10-200% mol ratio of alcohol and acid, taking 0.5-8 hours reaction at 80-140 degree centigrade to gain ester. The method has the advantages of high selective, hig universality, and the ester could be automatically separated with catalyst.

Description

Technical field [0001] The invention relates to an organic chemical reaction method, in particular to an acidic ionic liquid catalyzed alkyd esterification method. Background technique [0002] Carboxylate compounds have a wide range of industrial uses, many of which are important chemical and chemical products. Traditional alkyd esterification technology usually uses strong corrosive inorganic acids such as concentrated sulfuric acid as catalysts, which have problems such as low selectivity, colored products, difficult to separate from products, corroding equipment and polluting the environment, so the industry has environmental benefits for development. The demand for a new alkyd acid esterification system with economic benefits is extremely urgent. Ionic liquids that are liquid at room temperature are new materials that have attracted much attention in recent years. They have the advantages of good stability, non-volatility, solubility and adjustable acidity. As a new type of ...

Claims

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Application Information

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IPC IPC(8): C07C67/08B01J31/04
Inventor 黄宝华汪艳飞方岩雄赵肃清张焜黎子进史娜周蓓蕾
Owner GUANGDONG UNIV OF TECH
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