To selectively produce a dihydric phenol in high yield by continuously adding a mixture of hydrogen peroxide solution with an organic solvent to a mixture of phenol with a catalyst.

A mixture of hydrogen peroxide solution with an organic solvent is continuously added to a mixture of phenol with a catalyst (preferably a zeolite having titanium in a lattice of the zeolite) to oxidize the phenol in the presence of a catalyst and to provide the objective compound. The organic solvent can be mixed with the hydrogen peroxide, and is preferably an organic solvent inert under the reaction condition. The mixture of the hydrogen peroxide solution with the organic solvent is preferably continuously added during 50-100% time of the reaction time. The hydrogen peroxide solution is preferably 30 wt.% solution of the hydrogen peroxide, and the molar ratio of the hydrogen peroxide (H2O2) to the phenol (H2O2:phenol) is preferably (1:1)-(1:20). The ratio (by weight) of the hydrogen peroxide to the organic solvent is preferably (1:10)-(1:100).