Recovery of hydroquinone

Details Recovery of hydroquinone Recovery of hydroquinone

1978-01-16

1978-09-05

Thomas, Jr., James O.

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

Organic compounds

Oxygen containing

C07C 3708

Patent

active

041122445

ABSTRACT:
Hydroquinone is obtained in greater than 95 percent yield through a nonaqueous recovery process compatible with the methyl isobutyl ketone (MIBK) based diisopropylbenzene dihydroperoxide isolation process. Hydroquinone, from the Hock-splitting reaction, is precipitated (after most of the reaction solvent is distilled off), separated, repulped in acetone, crystallized and separated again. The supernatant from the first separation step contains hydroquinone along with tars. This stream is subjected to a purification process comprising a series of distillation and extraction steps so that the hydroquinone in that stream can be recycled back into the process.

REFERENCES:
patent: 3798277 (1974-03-01), Sugiyama
patent: 3968723 (1976-07-01), Burkholder et al.
patent: 4049723 (1977-09-01), Tanaha et al.

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