Homogeneous Catalysts of Redox Processes Based on Heteropolyacid Solutions III: Developing Effective Ways for the Preparation of 2,3,5-Trimethyl-1,4-Benzoquinone

Different ways of preparing 2,3,5-trimethyl-1,4-benzoquinone (TMQ), a key intermediate in the synthesis of vitamin E, via the catalytic oxidation of 2,3,6-trimethylphenol (TMP) are considered. It is shown that aqueous solutions of Mo–V phosphoric heteropolyacids (HPAs) are promising catalysts for th...

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Bibliographic Details
Published in:Catalysis in industry 2019-07, Vol.11 (3), p.179-190
Main Authors: Rodikova, Yu. A., Zhizhina, E. G.
Format: Article
Language:English
Subjects:
Acetic acid
Aqueous solutions
Catalysis
Catalysis in Chemical and Petrochemical Industry
Catalysts
Catalytic oxidation
Chemical synthesis
Chemistry
Chemistry and Materials Science
Oxidation
Quinones
Selectivity
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Summary:Different ways of preparing 2,3,5-trimethyl-1,4-benzoquinone (TMQ), a key intermediate in the synthesis of vitamin E, via the catalytic oxidation of 2,3,6-trimethylphenol (TMP) are considered. It is shown that aqueous solutions of Mo–V phosphoric heteropolyacids (HPAs) are promising catalysts for the oxidation of TMP with oxygen. Different technological options are analyzed for using HPAs in this reaction: the one-stage homogeneous acetic acid oxidation of TMP and a biphasic two-step procedure. The efficiency of a biphasic version that ensures high (up to 99.5%) selectivity for TMQ and high catalyst productivity in the target reaction (≈600–800 g TMQ  h −1 ) is proved.
ISSN:2070-0504
2070-0555
DOI:10.1134/S2070050419030097