1,2,3,4,4a,9a-hexahydro anthracene-9,10-dione, preparation...

C - Chemistry – Metallurgy – 07 – C

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9/16, 260/236.2

C07C 50/18 (2006.01) C21C 3/00 (2006.01) D21C 3/22 (2006.01)

Patent

CA 1117940

ABREGE DESCRIPTIF L'invention a pour objet l'hexahydro-1,2,3,4,4a, 9a anthracène-dione-9,10 et un procédé pour sa préparation carac- térisé en ce que l'on soumet la tétrahydro-1,4,4a, 9a anthra- quinone à une hydrogénation catalytique en phase liquide et sépare le tétrahydro-1,2,3,4 anthracène-diol-9,10 et l'hexa- hydro-1,2,3,4,4a, 9a anthracène-dione-9,10 ainsi obtenus. Cette anthracène-dione et son mélange avec l'anthracène-diol sont utilisables pour la préparation des pâtes à papier, plus pré- cisément pour la délignification des matériaux lignocellulo- siques.

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