Plant for the producing hydrogen peroxide

Details Plant for the producing hydrogen peroxide Plant for the producing hydrogen peroxide

C - Chemistry, Metallurgy

01

B

C01B 15/023 (2006.01) B01J 19/32 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2214087

A plant for producing hydrogen peroxide by auto-oxidation of an anthraquinone derivative, including a catalytic hydrogenation vessel (1) supplied with hydrogen; an oxidising vessel (2) supplied with an oxygen-containing fluid, particularly air; an extractor (3) supplied with water; and means (7, 16, 19) for successively feeding a working solution containing at least one anthraquinone derivative dissolved in at least one organic solvent through the hydrogenation vessel (1), the oxidising vessel (2) and the extractor (3), then recirculating it to the hydrogenation vessel (1). Means (9, 26) are provided for diverting at least part of the working solution from the extractor (3) to the oxidising vessel (2) so that it by-passes the hydrogenation vessel (1). The plant is useful for producing hydrogen peroxide in situ in a paper pulp bleaching plant.

L'invention concerne une installation de production de peroxyde d'hydrogène selon la technique d'auto-oxydation d'un dérivé anthraquinonique. Elle comprend un hydrogénateur catalytique (1) alimenté en hydrogène; un oxydeur (2) alimenté en un fluide contenant de l'oxygène, notamment en air; un extracteur (3) alimenté en eau; et des moyens (7, 16, 19) pour faire passer une solution de travail, contenant au moins un dérivé anthraquinonique en solution dans au moins un solvant organique, successivement dans l'hydrogénateur (1), dans l'oxydeur (2) et dans l'extracteur (3), puis la recycler vers l'hydrogénateur (1). Il est prévu des moyens (9, 26) de dérivation vers l'oxydeur (2) d'une partie de la solution de travail issue de l'extracteur (3) sans que celle-ci ne passe par l'hydrogénateur (1). Application à la production de peroxyde d'hydrogène sur le site d'une installation de blanchiment de pâte à papier.

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