Process for producing pyrocatechol and hydroquinone

Details Process for producing pyrocatechol and hydroquinone Process for producing pyrocatechol and hydroquinone

C - Chemistry, Metallurgy

07

C

260/618

C07C 39/08 (2006.01) C07C 37/60 (2006.01)

Patent

CA 1201450

ABSTRACT OF THE DISCLOSURE The known nuclear hydroxylation of phenol with organic solvents of hydrogen peroxide in the presence of a catalyst is carried out with special, practically anhydrous solutions of hydro- gen peroxide in solvents forming azeotropes with water, said azeo- tropes having a boiling point below that of hydrogen peroxide, and also with sulphur dioxide as the catalyst. Therefore, the nuclear hydroxylation can be carried out in a much simpler manner than heretofore. Difficult separations, for example, of water-phenol, or the separation and recovery of the catalyst are dispensed with. Furthermore, the yields are increased.

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