Process for highly shape selective dewaxing which retards...

Details Process for highly shape selective dewaxing which retards... Process for highly shape selective dewaxing which retards...

C - Chemistry, Metallurgy

10

G

C10G 73/02 (2006.01) C10G 45/64 (2006.01) C10G 65/04 (2006.01)

Patent

CA 2263849

This application discloses a process for catalytically dewaxing a feedstock whereby the aging of the dewaxing catalyst is miminized. A variety of feedstocks which possess moderate levels of nitrogen and sulfur may be dewaxed in this invention. The feed is treated by a catalyst system comprising two catalysts acting in synergistic combination, a hydrotreating catalyst and a dewaxing catalyst. The hydrotreating catalyst is preferably loaded with noble metals and is capable of operating at higher than usual space velocities. The dewaxing catalyst is downstream of the hydrotreating catalyst. The dewaxing catalyst further comprises a constrained intermediate pore crystalline material which is loaded with a noble metal.

Cette invention concerne un procédé de déparaffinage par catalyseur d'une charge de départ, permettant de réduire au minimum le vieillissement du catalyseur de déparaffinage. Des charges de départ d'une grande variété, caractérisées par des taux modérés d'azote et de soufre, peuvent être déparaffinées dans le cadre de cette invention. A cet effet, la charge de départ est traitée par un système catalytique comprenant deux catalyseurs agissant en synergie, un catalyseur hydrotraitant et un catalyseur de déparaffinage. Le catalyseur hydrotraitant, chargé de préférence avec des métaux précieux, est capable d'opérer à des vitesses dans l'espace plus élevées que les vitesses habituelles. Le catalyseur de déparaffinage intervient en aval du catalyseur hydrotraitant. Le catalyseur de déparaffinage comprend en outre un matériau cristallin à pores intermédiaire contraint chargé d'un métal précieux.

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