Method for separation and recovering hydroquinone

Details Method for separation and recovering hydroquinone Method for separation and recovering hydroquinone

1975-09-17

1977-09-20

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260625, 203 44, 203 45, 203 46, 260621C, C07C 3908

Patent

active

040497232

ABSTRACT:
A method for separating and recovering hydroquinone which comprises distilling a by-product-containing acid-cleavage product, which is obtained by acid-cleavage of an oxidation product of para-diisopropyl benzene in a solvent, in the presence of an aromatic hydrocarbon, thereby removing low-boiling fractions including the solvent, bringing the resulting hydroquinone-containing distillation bottoms into contact with water, and crystallizing and separating hydroquinone; characterized in that
A. the distilling off of the low-boiling fractions is effected without the addition of water and in the absence of an azeotropic amount of water and also in the presence of an aromatic hydrocarbon containing 9 to 10 carbon atoms, and
B. the contacting of the distillation bottoms with water is effected under conditions which do not induce crystallization of hydroquinone in the distillation bottoms.

REFERENCES:
patent: 3365375 (1968-01-01), Nixon
patent: 3376352 (1968-04-01), Domenicali

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