Process for the production of pyrocatechol and hydroquinone

Details Process for the production of pyrocatechol and hydroquinone Process for the production of pyrocatechol and hydroquinone

1984-03-08

1986-10-21

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568741, 568800, 568803, C07C 3760, C07C 3910

Patent

active

046187308

ABSTRACT:
The known nuclear hydroxylation of phenol with organic solutions of hydrogen peroxide in the presence of a catalyst is carried out in improved manner by employing both (1) a special, practically water free solution of hydrogen peroxide in an organic solvent which forms an azeotrope with water, which azeotrope boils below the boiling point of hydrogen peroxide, and (2) sulfur dioxide as a catalyst. Through this, the nuclear hydroxylation is substantially simpler than previously; difficult separations, e.g., from water-phenol, or the separation and recovery of the catalyst are eliminated. Besides, the yields are increased.

REFERENCES:
patent: 3943179 (1976-03-01), Bost et al.
patent: 4533766 (1985-08-01), Drauz et al.
Schmidt, Z. fur Anorganische und Allgemeim Chemie, vol. 331, pp. 92-97 (1964).
Holleman et al, Lehrbuch Des Anorganischen Chemie, pp. 180, 195 (1955).

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