C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 37/14 (2006.01) C07C 39/08 (2006.01)
Patent
CA 2655410
The present invention relates to a process of separation and purification allowing purified hydroquinone to be obtained from crude mixtures essentially containing hydroquinone in combination with very small amounts of impurities including resorcinol and pyrogallol. The process of the invention, which involves starting from a crude hydroquinone containing said impurities, is characterized in that it comprises a topping distillation allowing the resorcinol to be removed as the distillation top product, and allowing a crude mixture essentially comprising hydroquinone and the heavy impurities to be recovered at the column bottom, said mixture then being subjected to a bottoming distillation which allows the pyrogallol to be removed at the column bottom and allows hydroquinone in a purified form to be recovered at the column top.
La présente invention a trait à un procédé de séparation et de purification, permettant d'obtenir de l'hydroquinone purifiée 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. Le procédé de l'invention qui consiste à partir d'une hydroquinone brute contenant lesdites impuretés est caractérisé par le fait qu'il comprend une distillation d'étêtage permettant d'éliminer le résorcinol en tête de distillation et de récupérer en pied de colonne un mélange brut comprenant essentiellement de l'hydroquinone et les impuretés lourdes, mélange qui est alors soumis à une distillation d'équeutage permettant d'éliminer le pyrogallol en pied de colonne et de récupérer en tête de colonne de l'hydroquinone sous une forme purifiée.
Gayet Hubert
Heinisch Bruno
Rhodia Operations
Robic
LandOfFree
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