Aqueous recovery of hydroquinone

Details Aqueous recovery of hydroquinone Aqueous recovery of hydroquinone

C - Chemistry, Metallurgy

07

C

202/53, 260/618.

C07C 39/08 (2006.01) C07C 37/08 (2006.01) C07C 37/68 (2006.01)

Patent

CA 1103277

Abstract of the Disclosure Hydroquinone having a purity greater than 99 percent is isolated through an aqueous recovery scheme compatible with the methyl isobutyl ketone based diisopropylbenzene dihydroperoxide isolation process. Hydroquinone, from the Hock-splitting reaction, is extracted into water while the impurities are concentrated in a distillation tower. Phase separation of the distillation tower bottoms affords an effi- cient separation of the hydroquinone from the organic impuri- ties. Concentration, crystallization, and solid liquid se- paration (centrifugation) of the aqueous phase yields a wet hydroquinone cake which, upon recrystallization from acetone, yields high purity hydroquinone.

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