Process for the preparation of partially hydrogenated...

C - Chemistry – Metallurgy – 08 – C

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C08C 19/02 (2006.01) C08F 8/04 (2006.01) G01N 21/65 (2006.01)

Patent

CA 2245182

The present invention relates to a process for the preparation of partially hydrogenated acrylonitrile-butadiene rubber in a pressurised reactor by hydrogenation of acrylonitrile- butadiene rubber by means of homogeneous or heterogeneous catalysis, in which the reactor contents are rendered inert before commencement of the hydrogenation, the Raman spectra of the reactor contents are recorded at short time intervals and the actual degree of hydrogenation of the product is determined from the intensities of the Raman emission lines and, on attainment of the required degree of hydrogenation, the reaction is arrested by suitable means.

La présente invention porte sur une méthode pour préparer un caoutchouc d'acrylonitrile-butadiène partiellement hydrogéné dans un réacteur, sous pression, par hydrogénation d'un caoutchouc d'acrylonitrile-butadiène, avec catalyse homogène ou hétérogène; le contenu du réacteur est rendu inerte avant le début de l'hydrogénation et le spectre Raman dudit contenu est enregistré à de courts intervalles de temps; le degré réel d'hydrogénation du produit est déterminé à partir des intensités des raies d'émission Raman; une fois que le degré d'hydrogénation recherché a été atteint, on arrête la réaction par des moyens appropriés.

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