Method for preparing citraconic anhydride and method for isomerizing/dehydrating itaconic acid

A technology of citraconic anhydride and itaconic acid, applied in chemical instruments and methods, chemical/physical processes, metal/metal oxide/metal hydroxide catalysts, etc. Recycling and other issues
CN102464638AActive Publication Date: 2012-05-23IND TECH RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
IND TECH RES INST
Publication Date
2012-05-23

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Abstract

The invention provides a method for preparing citraconic anhydride and a method for isomerizing / dehydrating itaconic acid. The method for preparing the citraconic anhydride comprises the following steps of: supplying the itaconic acid to serve as a reaction initiator; in the presence of a catalytic agent, and carrying out isomerizing / dehydrating reaction on the itaconic acid or a combination containing the itaconic acid to obtain the citraconic anhydride, wherein the catalytic agent contains heteropoly acid or salt of the heteropoly acid. The method for isomerizing / dehydrating itaconic acid comprises the following steps of: supplying the itaconic acid to serve as the reaction initiator; supplying the heteropoly acid or the salt of the heteropoly acid to form a mixture with the itaconic acid; and heating the mixture so as to carry out isomerizing / dehydrating reaction on the mixture, thereby obtaining the citraconic anhydride. According to the method, the itaconic acid can be converted into the citraconic anhydride product with high yield and application value under the preparation condition of the use or non-use of a dissolvant, and the industrial volume production is easily realized.
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Description

technical field

[0001] The invention relates to a method for preparing citraconic anhydride, more particularly, to a method for preparing citraconic anhydride from itaconic acid. Background technique

[0002] Citraconic anhydride (citraconic anhydride) is a compound similar to maleic anhydride molecules, also known as 2-methyl-maleic anhydride, that is, the second carbon atom of maleic anhydride has an extra 1 methyl functional group. Because its molecule is similar to maleic anhydride, it can also be made into downstream application derivatives similar to maleic anhydride. For example, citraconic anhydride can be used as an additive for unsaturated resin (unsaturated polyester resin, UPR), polyimide derivatives synthesized by citraconic anhydride can be used as composite materials or rubber additives, or citraconic anhydride can be used to synthesize bis Alcohol derivatives can be used as monomers of polyesters.

[0003] The early synthesis method of citraconic anhydride...

Claims

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