期刊
CATALYSIS IN INDUSTRY
卷 11, 期 3, 页码 179-190出版社
MAIK NAUKA-INTERPERIODICA
DOI: 10.1134/S2070050419030097
关键词
oxidation catalysts; trimethyl-p-benzoquinone; vitamin E; heteropolyacids
资金
- state task for the Boreskov Institute of Catalysis [AAAA-A17-117041710081-1]
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 (approximate to 600-800 g TMQ L-cat(-1) h(-1)) is proved.
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