Process for separation and purification of dihydric phenols

Details Process for separation and purification of dihydric phenols Process for separation and purification of dihydric phenols

B - Operations, Transporting

01

D

202/88, 260/623.

B01D 3/38 (2006.01) C07C 37/68 (2006.01) C07C 37/74 (2006.01)

Patent

CA 1130818

ABSTRACT OF THE DISCLOSURE Highly decolorized, purified hydroquinone and resorcinol can be separated from each other from a mixture containing hydroquinone and resorcinol and recovered by continuously rectifying the mixture, thereby obtaining rectification bottoms containing resorcinol and hydroquinone in a ratio by weight of resorcinol to hydroquinone of 0.1 - 1 : 1 while obtaining resorcinol as a distillate, redistilling the rectification bottoms, contacting hydroquinone vapor with water vapor, condens- in the hydroquinone vapor in the presence of the water vapor, thereby recovering hydroquinone as an aqueous hydroquinone solution, and then recrystallizing the aqueous hydroquinone solution, if necessary, in the presence of an organic solvent, thereby separating hydroquinone from the aqueous solution.

361613

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