| 摘要 |
PURPOSE:To prepare hydroquinone having excellent color tone, containing reduced amount of hydroperoxide, by carrying out the acid decomposition of the residual hydroperoxide in the distillation column during the removal of water in the acid decomposition of p-diisopropylbenzene dihydroperoxide under specific conditions. CONSTITUTION:p-Diisopropylbenzene dihydroperoxide is decomposed in the presence of an acid catalyst, the catalyst is removed from the reaction mixture, the low boiling components are removed by the distillation of the reaction mixture, and hydroquinone is recovered from the residue. In the above process, the acid decomposition is carried out contrilling the hydroperoxide concentration in the acid decomposition mixture to 0.1-1wt% pref. 0.2-0.5wt%, and carrying out the acid decomposition of the residual hydroperoxide in the distillation column or at the downstream of the distillation process during the removal of water. The recovered hydroquinone has reduced hydroperoxide content. The hydroquinone is pref. recovered as a solution by adding a solvent having higher boiling point than water, insoluble or hardly soluble in water, and capable of dissolving hydroquinone, to the reaction mixture during the distillation for the removal of acetone, water, etc.
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