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US 8,273,903 B2Granted
Method for preparing the citraconic anhydride and method for isomerizing/dehydrating itaconic acid
AssigneeIndustrial Technology Research Institute
InventorsHsi-Yen Hsu, Yu-Shan Chao
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Abstract
The disclosure provides a method for preparing the citraconic anhydride and a method for isomerizing/dehydrating itaconic acid. The method for preparing the citraconic anhydride includes the following steps: providing itaconic acid as a starting material; and subjecting the itaconic acid to an isomerization/dehydration reaction in the presence of a catalyst to obtain the citraconic anhydride, wherein the catalyst includes a heteropolyacid or heteropolyacid salt.
Claims19
A method for preparing the citraconic anhydride, comprising:
- providing an itaconic acid as a starting material;
- and
- subjecting the itaconic acid to an isomerization/dehydration reaction in the presence of a catalyst to obtain the citraconic anhydride, wherein the catalyst comprises a heteropolyacid or heteropolyacid salt.
A method for isomerizing/dehydrating itaconic acid, comprising:
- mixing an itaconic acid with heteropoly acid or salt thereof to form a mixture;
- and
- heating the mixture to undergo an isomerization/dehydration reaction, obtaining a citraconic anhydride.
Dependencies are inferred from the claim text.