Method for preparing purified hydroquinone and forming same

Details Method for preparing purified hydroquinone and forming same Method for preparing purified hydroquinone and forming same

C - Chemistry, Metallurgy

07

C

C07C 37/84 (2006.01) C07C 37/74 (2006.01) C07C 39/08 (2006.01)

Patent

CA 2652805

The invention relates to a method for preparing purified hydroquinone and forming same. The invention is intended to be used to obtain a purified hydroquinone from raw compounds essentially containing hydroquinone associated with very small quantities of impurities including resorcinol and pyrogallol. The invention is also intended to be used to obtain hydroquinone in an easy-to-handle form. The inventive method, which begins with a raw hydroquinone containing the above-mentioned impurities, is characterised in that it includes a distillation purification step in which the resorcinol and pyrogallol can be eliminated, directly followed by a step in which the purified hydroquinone is formed.

La présente invention vise à fournir une hydroquinone purifiée obtenue à partir de mélanges bruts contenant essentiellement de l'hydroquinone, en association avec de très faibles quantités d'impuretés incluant du résorcinol et du pyrogallol. L'invention vise également à fournir l'hydroquinone sous une forme aisément manipulable. Le procédé de l'invention qui consiste à artir d'une hydroquinone brute comprenant lesdites impuretés est caractérisé par le fait qu'il comprend une étape de purification par distillations permettant d'éliminer le résorcinol et le pyrogallol suivie directement par une étape de mise en forme de l'hydroquinone purifiée.

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