Method for preparing succinic anhydride through dehydration of amber acid under catalysis

A sulfate-catalyzed technology for succinic acid and succinic anhydride, which is applied in the preparation of carboxylic anhydride, organic chemistry, and chemical recovery, can solve problems such as excessive hydrogenation, complex reaction process, and use of chemical dehydrating agents, and achieve fast reaction speed , simple post-processing and convenient recycling

Active Publication Date: 2015-11-11
渭南高新区惠丰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Catalytic hydrogenation of maleic anhydride has problems such as strict process control requirements and prone to excessive hydrogenation; ethylene oxide method has problems such as complicated reaction process and high process risk; concentrated sulfuric acid dehydration method has many side reactions and product color Deep, poor quality and other problems; succinic acid exchange dehydration method has problems such as the use of chemical dehydrating agents, high production costs, and complicated product separation and purification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Put 20 g of succinic acid, 0.2 g of catalyst barium hydroxide, and 60 g of solvent tetrahydronaphthalene into a reaction flask equipped with a stirrer, thermometer and water separator, heat and stir at 215° C. for reflux reaction for 4 hours. After the reaction, the resulting mixture was cooled slowly, crystallized, filtered, washed with dichloroethane, and vacuum-dried to obtain the product succinic anhydride with a yield of 98.5% and a purity of succinic anhydride of 98.8%.

Embodiment 2

[0019] Example 2: Put 20 g of succinic acid, 0.4 g of catalyst magnesium hydroxide, and 200 g of solvent tetralin into a reaction flask equipped with a stirrer, thermometer and water separator, heat and stir at 210° C. for reflux reaction for 1 h. After the reaction, the resulting mixture was cooled slowly, crystallized, filtered, washed with dichloroethane, and vacuum-dried to obtain the product succinic anhydride with a yield of 94.7% and a purity of succinic anhydride of 98.5%.

Embodiment 3

[0020] Example 3: Put 20 g of succinic acid, 0.04 g of catalyst strontium hydroxide, and 20 g of solvent tetrahydronaphthalene into a reaction flask equipped with a stirrer, thermometer and water separator, heat and stir at 230° C. for reflux reaction for 10 h. After the reaction, the resulting mixture was cooled slowly, crystallized, filtered, washed with dichloroethane, and vacuum-dried to obtain the product succinic anhydride with a yield of 97.9% and a purity of succinic anhydride of 98.6%.

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Abstract

A method for preparing succinic anhydride through dehydration of amber acid under the catalysis of alkaline-earth metal hydroxide or alkaline-earth metal sulfate is characterized by comprising the following steps: taking alkaline-earth metal hydroxide or alkaline-earth metal sulfate as a catalyst, wherein the mass ratio of amber acid to the catalyst is (50 to 500):1, the mass ratio of amber acid to a solvent is 1:(1 to 10), the reaction temperature is 150 to 230 DEG C, and the reaction time is 1.0 to 10.0 hours; recovering the solvent for reutilization. Compared with the prior art, the method has the advantages that 1, the catalyst is wide in source and low in cost, and the reaction rate is high; 2, the product post-treatment is simple, and the purity of the obtained succinic anhydride as well as the yield is high; 3, the solvent is convenient to recover and can be used repeatedly without impacting the productivity seriously.

Description

technical field [0001] The invention relates to a method for preparing succinic anhydride, in particular to a novel method for preparing succinic anhydride by catalyzing the dehydration of succinic acid by alkaline earth metal hydroxide or alkaline earth metal sulfate. Background technique [0002] Succinic anhydride, also known as succinic anhydride, has a wide range of uses in medicine, pesticides, petrochemicals, etc. At present, the methods for producing succinic anhydride mainly include maleic anhydride catalytic hydrogenation method, ethylene oxide method, concentrated sulfuric acid dehydration method and succinic acid exchange dehydration method. Catalytic hydrogenation of maleic anhydride has problems such as strict process control requirements and prone to excessive hydrogenation; ethylene oxide method has problems such as complicated reaction process and high process risk; concentrated sulfuric acid dehydration method has many side reactions and product color Deep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60
CPCY02P20/584C07D307/60C07C51/56
Inventor 刘仕伟李露于世涛解从霞刘福胜宋怡鹏
Owner 渭南高新区惠丰新材料科技有限公司
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