Process for preparing purified hydroquinone

Details Process for preparing purified hydroquinone Process for preparing purified hydroquinone

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2655413

The present invention relates to a process for preparing hydroquinone devoid of the impurities resulting from its preparation process. The process for preparing purified hydroquinone from a crude hydroquinone essentially containing hydroquinone and small amounts of impurities including at least resorcinol, pyrogallol and traces of pyrocatechol is characterized in that it comprises at least the following steps: dissolving the crude hydroquinone in water, crystallizing the hydroquinone, separating the purified hydroquinone, and, optionally, a step of drying the purified hydroquinone. The process of the invention may include other steps, and, depending on the embodiment selected, which may include a different sequence of the steps, it is possible to obtain hydroquinone in various degrees of purity.

La présente invention a pour objet un procédé de préparation d'hydroquinone débarrassée des impuretés résultantes de son procédé de préparation. Le procédé de préparation d'hydroquinone purifiée à partir d'une hydroquinone brute contenant essentiellement de l'hydroquinone, et de faibles quantités d'impuretés incluant au moins du résorcinol, du pyrogallol et des traces de pyrocatéchol est caractérisé par le fait qu'il comprend au moins les étapes suivantes : dissolution de l'hydroquinone brute dans l'eau, cristallisation de l'hydroquinone, séparation de l'hydroquinone purifiée et éventuellement une étape de séchage de l'hydroquinone purifiée. Le procédé de l'invention peut inclure d'autres étapes et selon le mode de réalisation choisi susceptible de comprendre un enchaînement différent des étapes, il est possible d'obtenir de l'hydroquinone à divers degrés de pureté.

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