Aqueous recovery of hydroquinone

Details Aqueous recovery of hydroquinone Aqueous recovery of hydroquinone

1977-09-14

1978-10-10

Thomas, Jr., James O.

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

Organic compounds

Oxygen containing

568753, C07C 3908

Patent

active

041197917

ABSTRACT:
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 efficient separation of the hydroquinone from the organic impurities. Concentration, crystallization, and solid liquid separation (centrifugation) of the aqueous phase yields a wet hydroquinone cake which, upon recrystallization from acetone, yields high purity hydroquinone.

REFERENCES:
patent: 3798277 (1974-03-01), Sugiyama et al.
patent: 3884983 (1975-05-01), Burkholder et al.
patent: 3895079 (1975-07-01), Anderson et al.
patent: 3900523 (1975-08-01), Tada
patent: 3968171 (1976-07-01), Burkholder et al.
patent: 4049723 (1977-09-01), Tanaka et al.

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