Hydrogenation of unsaturated cyclic compounds

C - Chemistry – Metallurgy – 07 – C

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C07C 209/72 (2006.01) B01D 3/00 (2006.01) C07C 5/10 (2006.01) C07C 13/16 (2006.01) C07C 211/35 (2006.01) C07C 211/45 (2006.01)

Patent

CA 2210863

A process for the hydrogenation of unsaturated cyclic and polycyclic compounds to saturates is provided wherein the reactor is operated at a pressure wherein the reaction mixture is boiling under low hydrogen partial pressure in the range of about 0.1 psi to less than 70 psia at 0 to 350 psig. The catalyst is provided as a catalytic distillation structure such that the reaction is concurrently occurring with a distillation. A portion of the overheads is returned as reflux to provide cooling within the catalyst bed and concurrent condensation of some of the gaseous material within the bed. Although no separation is obtained all of the advantages of concurrent reaction with distillation are achieved.

L'invention porte sur un procédé permettant d'hydrogéner des composés cycliques et polycycliques insaturés pour les amener à saturation. Pour ce faire, le réacteur fonctionne à une pression à laquelle le mélange réactif bout à une pression partielle d'hydrogène comprise entre 0,1 psi environ et moins de 70 psi absolus à une valeur de psi manométriques comprise entre 0 et 350. Le catalyseur de cette invention se présente sous la forme d'une structure catalytique de distillation de sorte que la réaction se fait concurremment à une distillation. Une partie des distillats de tête est renvoyée sous forme de reflux pour assurer la réfrigération dans le lit catalytique et la condensation simultanée de certaines substances gazeuses dans ce même lit. Même s'il n'y pas séparation, ce procédé permet de bénéficier de tous les avantages que procurent une réaction et une distillation simultanées.

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