Dual catalyst system for hydroisomerization of...

C - Chemistry – Metallurgy – 10 – G

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C10G 45/62 (2006.01) C10G 45/64 (2006.01) C10G 65/04 (2006.01)

Patent

CA 2500456

The present invention relates to a process for converting Fischer~Tropsch wax to high quality lube basestocks using a molecular sieve Beta catalyst followed by a unidimensional intermediate pore molecular sieve with near circular pore structures having an average diameter of 0.50 run to 0.65 nm wherein the difference between the maximum diameter and the minimum is <= 0.05 nm. Both catalysts comprise one or more Group VIII metals. For example, a cascaded two- bed catalyst system consisting of a first bed Pt/Beta catalyst followed by a second bed Pt/ZSM-48 catalyst is highly selective for wax isoinerization and lube hydrodewaxing with minimal gas formation.

La présente invention concerne un procédé de transformation d'une paraffine de Fischer-Tropsch en huiles de base de graissage de haute qualité au moyen d'un catalyseur Bêta à tamis moléculaire, puis d'un tamis moléculaire à pores intermédiaires unidimensionnels dont les structures de pores quasi circulaires présentent un diamètre moyen de 0,50 nm à 0,65 nm, l'écart entre le diamètre maximum et le diamètre minimum étant = 0,05 nm. Les deux catalyseurs comprennent un ou plusieurs métaux du groupe VIII. A titre d'exemple, un système catalytique à double lit en cascade comprenant un premier lit avec catalyseur Pt/Bêta et un second lit avec catalyseur Pt/ZSM-48 présente une grande sélectivité pour l'isomérisation de la paraffine et l'hydrodéparaffinage, pour une formation minimale de gaz.

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