Ion liquid catalyst of esterification reaction, preparation method and usage

A technology of esterification reaction and ionic liquid, which is applied in the field of esterification reaction catalyst and its synthesis, can solve the problems of low conversion rate of esterification reaction, complex synthesis of ionic liquid, and a large amount of organic solvents, etc., and achieve environmental friendliness, high purity, low cost effect

Inactive Publication Date: 2009-06-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis of the ionic liquid used in the above-mentioned method for synthesizing esters is complicated, and still requires a large amount of organic solvents, and the conversion rate of the esterification reaction is not high, and the post-treatment is more cumbersome, etc.

Method used

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  • Ion liquid catalyst of esterification reaction, preparation method and usage
  • Ion liquid catalyst of esterification reaction, preparation method and usage
  • Ion liquid catalyst of esterification reaction, preparation method and usage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 16.9 g (0.1 mol) of N-butyl-2-pyrrolidone and dissolve it in benzene, slowly add 9.6 g (0.1 mol) of methanesulfonic acid dropwise under stirring at 20°C, drop it in 30 minutes, continue stirring at 50°C for reaction 4 After 1 hour, the benzene was removed by heating under vacuum to obtain a light yellow liquid, which was the product N-butyl-2-pyrrolidone methanesulfonic acid ionic liquid. Stable to water and air, the yield is 97%. Density 1.1021 g / ml, conductivity 1.07×10 -3 S / cm, the melting point is -54°C.

Embodiment 2

[0030] Weigh 19.8 grams (0.2 mol) of N-methyl-2-pyrrolidone, slowly add 19.2 grams (0.2 mol) of methanesulfonic acid dropwise under stirring at 0°C, drop it in 3 hours, continue to stir and react at 80°C for 5 hours, that is The product N-methyl-2-pyrrolidone methanesulfonic acid ionic liquid was obtained. Stable to water and air, density 1.154 g / ml, conductivity 2.64×10 -3 S / cm, the melting point is -46°C. Yield 100%.

Embodiment 3

[0032] Weigh 12.8 g (0.1 mol) of N-isopropyl-2-pyrrolidone, slowly add 30 mL of a toluene solution of 9.6 g (0.1 mol) of methanesulfonic acid dropwise under stirring at 20°C, drop it in 30 minutes, and continue to stir the reaction at 100°C After 2 hours, the toluene was removed under vacuum by heating to obtain the product N-methyl-2-pyrrolidone ionic liquid. Stable to water and air, the yield is 98%. Density 1.134 g / ml, conductivity 2.54×10 -3 S / cm, the melting point is -56°C.

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Abstract

A liquid catalyst containing N-alkylpyrrolidone-yl Bronsted acid ions for esterifying reaction has high transform rate, selectivity and cyclic life (more than 20). Said esterifying process includes such steps as providing fatty acid or aromatic acid and straight- or branch-chain alcohol, mixing while adding said catalyst used also as solvent, stirring, heating, laying aside, gravitational depositing, and separating liquid to obtain the esterified product.

Description

technical field [0001] The invention relates to an esterification reaction catalyst and its synthesis method, as well as its application in the synthesis of esters, belonging to the technical field of organic chemical reaction methods. Background technique [0002] Organic carboxylic acid ester is an important product and intermediate in chemical industry and medicine, and market analysts pointed out that the global ethyl acetate and butyl acetate market will maintain a good growth momentum in the future, especially in the United States, due to the formulated Coatings that do not contain air pollutants have greatly promoted the vigorous development of the ester industry. In the paint industry, ethyl acetate is usually used to replace methyl ethyl ketone, and butyl acetate can not only replace methyl ethyl ketone, but also can replace isobutyl ketone, xylene or toluene. Most of the esterification methods in the background art use inorganic acids as catalysts. However, a lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02C07C67/08
CPCY02P20/584
Inventor 周晓海张海波
Owner WUHAN UNIV
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