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Method of esterifying in ion liquid [Hmim]+ BF4-

A technology of ionic liquids and medium esters, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of complex synthesis of ionic liquids and low conversion rate of esterification reaction, and achieve simple and low-cost synthesis methods , good universal effect

Inactive Publication Date: 2003-03-26
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2002, J.Fraga-Dubreuil et al reported the method of utilizing ionic liquid to catalyze esterification on "Catalysis Communications", but the ionic liquid used in this method is complex to synthesize, and still needs a large amount of organic solvent, and the esterification reaction low conversion rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment one: 22g ionic liquid [Hmim] + BF 4 - Put 12.0g acetic acid and 14.8g n-butanol into the reaction flask, stir, heat, control the temperature to 110°C, react for 2 hours, let the reaction solution stand still, settle by gravity, and separate the esterification product n-butyl acetate by liquid separation , the conversion rate is 100%, and the selectivity is 100%. The ionic liquid in the lower layer is recycled after dehydration.

Embodiment 2

[0014] Embodiment two: 22g ionic liquid [Hmim] + BF 4 - Put 12.0g acetic acid and 26g n-octanol into the reaction flask, stir, heat, control the temperature to 110°C, react for 4 hours, let the reaction solution stand still, settle by gravity, and separate the esterification product n-octyl acetate by liquid separation. The conversion rate is 99%, and the selectivity is 100%. The ionic liquid in the lower layer is recycled after dehydration.

Embodiment 3

[0015] Embodiment three: 22g ionic liquid [Hmim] + BF 4 - Put 20g of dodecanoic acid and 7.4g of n-butanol into the reaction flask, stir, heat, control the temperature to 110°C, react for 6 hours, let the reaction solution stand still, settle by gravity, and separate out the esterification product 12 by liquid separation. N-butyl alkanoate has a conversion rate of 98% and a selectivity of 100%. The ionic liquid in the lower layer is recycled after dehydration.

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PUM

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Abstract

The invention relates to a method for making esterification in ion liquid [Hmim](+)BF4(-), i,e, methyl imidazole salt tetrafluoroborate which can be used as solvent and catalyst. in the esterification reaction the fatty acid or aromatic acid and straight chain alcohol or branched chain alcohol are undergone the processes of stirring, heating, standing still and gravity settling so as to obtain the esterified product. Its conversion rate is 80-100%, its selectivity is 100%, and its conversion rate is high, and its catalyst can be repeatedly and circularly used, etc.

Description

technical field [0001] The present invention relates to a kind of ionic liquid [Hmim] + BF 4 - , that is, a method for esterification in methylimidazolium tetrafluoroborate, which belongs to the technical field of organic chemical reaction methods. Background technique [0002] Esters are important intermediates in industry and the pharmaceutical industry. Most of the esterification methods in the background art use inorganic acids as catalysts. However, a large amount of organic solvent is required, and the residual waste acid after the reaction will cause environmental pollution. Ionic liquids are a class of environmentally friendly new materials that have received great attention in recent years. They have the advantages of good stability, non-volatility, and adjustable compatibility with organic substances. In 2002, J.Fraga-Dubreuil et al reported the method of utilizing ionic liquid to catalyze esterification on "Catalysis Communications", but the i...

Claims

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Application Information

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IPC IPC(8): C07C67/08
Inventor 杨帆朱华萍汤杰何鸣元
Owner EAST CHINA NORMAL UNIVERSITY
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