Method for producing trimethylhydroquinone
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United States of America Patent
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Nov 20, 2001
Issued Date -
N/A
app pub date -
May 17, 2000
filing date -
Aug 1, 1997
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Expired
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Abstract
An inexpensive method for producing trimethylhydroquinone free from the problem of the disposal of waste catalyst, which method comprises the steps of: (1) reacting isophorone in the presence of an acid catalyst and recovering .beta.-isophorone by distillation, (2) oxidizing the .beta.-isophorone in the presence of amorphous carbon and a base to obtain 4-oxoisophorone, (3) reacting the 4-oxoisophorone with an acid anhydride in a liquid phase or with a carboxylic acid in a vapor phase in the presence of a solid acid catalyst to obtain trimethylhydroquinones, and (4) hydrolyzing the trimethylhydroquinones to obtaining trimethylhydroquinone.
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