Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1979-10-19
1981-03-24
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C07C 3701
Patent
active
042582199
ABSTRACT:
An improved process for producing hydroquinone from p-isopropenyl phenol is disclosed. Hydroquinone is obtained by oxidizing p-isopropenyl phenol with hydrogen peroxide or an organic peroxide as an oxidizing agent at a temperature of 28.degree. to 50.degree. C. in the presence of a strong acid catalyst using a slightly or hardly water-soluble high-boiling polar solvent. In the oxidation reaction, the mole ratio of the oxidizing agent to p-isopropenyl phenol is kept at less than 1. After the reaction, in order to effectively decompose or consume the undecomposed p-isopropenyl phenol hydroperoxide and the unreacted oxidizing agent remaining in the reaction mixture, the reaction mixture is aged. Alternatively, or subsequently to the aging reaction, SO.sub.2 is added to the reaction mixture to completely decompose the undecomposed or unreacted peroxide. Thus, hydroquinone of high purity is obtained.
REFERENCES:
patent: 3849502 (1974-11-01), Bourdin et al.
patent: 4045496 (1977-08-01), Seifert
patent: 4078006 (1978-03-01), Umemeura et al.
Kato Nobukatsu
Morimoto Yoshio
Takase Tsutomu
Lone Werren B.
Mitsui Toatsu Chemicals Inc.
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