Method for producing trimethylhydroquinone
AssigneeNippon Petrochemicals Company, Limited
InventorsKazuharu Suyama, Noboru Kiyota, Tomohiro Konishi, Yasuo Matsumura
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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 β-isophorone by distillation, (2) oxidizing the β-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.
Claims12
A method for producing trimethylhydroquinone comprising:
- reacting isophorone in the presence of an acid catalyst and recovering β-isophorone by distillation;
- oxidizing said β-isophorone in the presence of amorphous carbon and a base to obtain 4-oxoisophorone;
- reacting said 4-oxoisophorone in a vapor phase with a carboxylic acid in the presence of a solid acid catalyst to obtain at least one compound represented by the following formula [I]:
- wherein R1 and R2 may be the same or different and are selected from hydrogen or an acyl group;
- and
- hydrolyzing compounds having at least one acyl group in the obtained reaction product represented by the formula [I], thereby obtaining trimethylhydroquinone.
A method for producing trimethylhydroquinone comprising:
- reacting 4-oxoisophorone in a vapor phase with a carboxylic acid in the presence of a solid acid catalyst to obtain at least one compound represented by the following formula [I]:
- wherein R1 and R2 may be the same or different and are selected from hydrogen or an acyl group;
- and
- hydrolyzing compounds having at least one acyl group in the obtained reaction product represented by the formula [I], thereby obtaining trimethylhydroquinone.
Dependencies are inferred from the claim text.