BULLETIN OF THE
Article
Isomerization of Maleic Acid to Fumaric Acid
KOREAN CHEMICAL SOCIETY
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above 75%, and H NMR spectrum of product in Figure 10
indicated that its purity was very high. So filter liquor recycle
was a promising way to achieve zero emission.
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Conclusion
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Fumaric acid was prepared through the isomerization of
maleic acid without catalysts. The concentration of the
maleic acid, reaction temperature and pH of solution played
important roles in the yield of the fumaric acid. When the
filter liquor recycled six times and its pH was 1.01, reaction
temperature was at 190 C, the concentration of maleic acid
was 80%, reaction time was 1 h, the 86% yield of fumaric
acid was obtained.
The fumaric acid products yield could be guaranteed.
The more acidic, the reaction is more complete, the greater
the yield of fumaric acid. And the purity of the fumaric
acid products did not change with the accumulation of the
organic acid and the cyclic index and the pH of the filtrate.
Finally, the potential for industrial application of this fuma-
ric green production is very large, which greatly protects
the environment. This can be used as green and efficient
way maleate isomerizes to fumaric acid.
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Acknowledgments. We would like to acknowledge the
financial support of Tianjin Bohai Chemical Industry
Group and Tianjin University of Science and Technology.
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Bull. Korean Chem. Soc. 2018
© 2018 Korean Chemical Society, Seoul & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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