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Method for synthesizing ester in dodecyl benzene sulfonic acid reverse micro emulsion

A technology of dodecylbenzenesulfonic acid and inverse microemulsion, which is applied in the field of ester synthesis, can solve problems such as environmental pollution and high requirements for production equipment, and achieve the effects of low cost, pollution avoidance, and good universality

Inactive Publication Date: 2008-05-14
NORTHEAST NORMAL UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

Due to the strong oxidation and strong corrosiveness of concentrated acid, the requirements for production equipment are relatively high, and the residual waste acid after the reaction will cause environmental pollution

Method used

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  • Method for synthesizing ester in dodecyl benzene sulfonic acid reverse micro emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In 100mL 50mmol·L -1 Add acetic acid and n-butanol with a molar ratio of 2:1 to the DBSA inverse microemulsion, the pH of the buffer solution is 7.0, react at 35°C for 3 hours, stop stirring, and evaporate the esterification product n-butyl acetate under reduced pressure, The conversion rate is 99%, and the DBSA is recycled after being distilled off.

Embodiment 2

[0020] In 100mL 50mmol·L -1 Add acetic acid and n-hexanol with a molar ratio of 2:1 to the DBSA inverse microemulsion, the pH of the buffer solution is 7.0, react at 40°C for 3 hours, stop stirring, evaporate the esterification product n-hexyl acetate under reduced pressure, and transform The yield is 99%, and the DBSA is recycled after being evaporated.

Embodiment 3

[0022] In 100mL 50mmol·L -1 Add acetic acid and n-octanol with a molar ratio of 1.5:1 to the DBSA inverse microemulsion, the pH of the buffer solution is 6.8, react at 38° C. for 3 hours, stop stirring, and evaporate the esterification product n-octyl acetate under reduced pressure, The conversion rate is 97%, and the DBSA is recycled after being distilled off.

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Abstract

The invention relates to an ester synthesis method, belonging to an organic chemical reaction method. In the dodecyl benzene sulfonic acid (DBSA) used as catalyst and surface-active material, an esterification reaction is implemented to the fatty acid and straight chain alcohol, the branched chain alcohol and the alcohol with unsaturated link and aromatic alcohol; under mild conditions, the conversion rate of the reaction can reach 74 percent to 99 percent. The invention enables the DBSA to be dissolved into the cyclohexane, the quantitative buffer solution is added into the cyclohexane solution, and then alcohol and acid are added for esterification reaction. The invention has the advantages of high conversion rate, high applicability, simple process, mild condition, recyclability of DBSA and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of organic chemical reaction methods, in particular to a synthesis method of esters. technical background [0002] Esters are important intermediates in bio-organic, pharmaceutical and fragrance industries. Usually the esterification reaction needs higher temperature, concentrated acid as catalyst, and the reaction time is long, and the reaction conversion rate is low. In order to improve the conversion rate and reaction rate of the esterification reaction, a method of excess reactant or removal of a product is often adopted. Due to the strong oxidation and strong corrosiveness of concentrated acid, the requirements for production equipment are relatively high, and the residual waste acid after the reaction will cause environmental pollution. Therefore, it is a hot spot in the field of ester synthesis to study various effective and environmentally friendly synthetic methods. [0003] Microemulsion is a mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08
Inventor 褚莹刘景林韩玉淳李学杰景璐
Owner NORTHEAST NORMAL UNIVERSITY
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