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

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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 liq

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Example 1: 22g ionic liquid [Hmim] + BF 4 - Put into the reaction flask with 12.0g acetic acid and 14.8g n-butanol, stir, heat, control the temperature to be 110 ° C, react for 2 hours, the reaction solution is left standstill, gravity sedimentation, and the esterification product n-butyl acetate is separated by liquid separation , the conversion rate is 100%, and the selectivity is 100%. The ionic liquid in the lower layer is recycled after removing water.

Example Embodiment

[0014] Example 2: 22g ionic liquid [Hmim] + BF 4 - Put into the reaction flask with 12.0g acetic acid and 26g n-octanol, stir, heat, control the temperature to be 110 ℃, react for 4 hours, the reaction solution is allowed to stand, gravity sedimentation, and the esterification product n-octyl acetate is separated by liquid separation, The conversion was 99% and the selectivity was 100%. The ionic liquid in the lower layer is recycled after removing water.

Example Embodiment

[0015] Embodiment 3: 22g ionic liquid [Hmim] + BF 4 - Put into the reaction flask with 20g dodecanoic acid and 7.4g n-butanol, stir, heat, control temperature to be 110 ℃, react for 6 hours, the reaction solution is left standstill, gravity sedimentation, and the esterification product twelve is separated by liquid separation n-Butyl alkanoate with 98% conversion and 100% selectivity. The ionic liquid in the lower layer is recycled after removing water.

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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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