Process for the concentration of aqueous hydrogen peroxide...

Details Process for the concentration of aqueous hydrogen peroxide... Process for the concentration of aqueous hydrogen peroxide...

C - Chemistry, Metallurgy

01

B

C01B 15/013 (2006.01)

Patent

CA 2427710

The invention is directed towards a process for the concentration of aqueous hydrogen peroxide, comprising discontinuous crystallisation. According to the invention, a cooling surface arranged in a crystallising vessel and first wetted with hydrogen peroxide is cooled at a high cooling rate, whereupon seed crystals form. The cooling rate is at least 1 K/s, preferably from 10 to 30 K/s. When the vessel has been filled with H2O2 starting material, the latter crystallises, starting from the seed crystals, and forms a crystal layer. When the mother liquor of lower H2O2 concentration has been discharged, there follows a sweating operation with a slow increase in temperature, as a result of which the H2O2 concentration in the crystal layer is increased further.

L'invention concerne un procédé de concentration d'un peroxyde d'hydrogène aqueux par cristallisation discontinue. Selon cette invention, une surface de refroidissement, agencée dans une cuve de cristallisation et d'abord humidifiée au peroxyde d'hydrogène, est refroidie à une vitesse de refroidissement élevée, de sorte que des cristaux germes se forment. Cette vitesse de refroidissement est d'au moins 1 K/s, de préférence de 10 à 30 K/s. Une fois que la cuve est remplie du produit de départ, à savoir de H¿2?O¿2?, ce dernier cristallise d'abord sous la forme desdits cristaux germes pour ensuite former une couche de cristal. Lorsque la solution-mère de concentration en H¿2?O¿2? inférieure est déchargée, un processus de ressuage avec une faible augmentation de température entraîne une nouvelle augmentation de la concentration en H¿2?O¿2? dans la couche de cristal.

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