Process for preparing basestocks having high vi

Details Process for preparing basestocks having high vi Process for preparing basestocks having high vi

C - Chemistry, Metallurgy

10

G

C10G 65/04 (2006.01) C10G 45/08 (2006.01) C10G 45/12 (2006.01) C10G 45/62 (2006.01) C10G 45/64 (2006.01) C10G 69/00 (2006.01) C10M 171/02 (2006.01) B01J 29/04 (2006.01) B01J 29/74 (2006.01)

Patent

CA 2501044

A process for preparing high VI lubricating oil basestocks comprising hydrotreating, hydrodewaxing and optionally hydrofinishing. The hydrotreating step is under conditions such that the amount of conversion to 343~C minus is less than 5wt% of the feedstock and the VI increase is less than 4 VI over the feedstock. Hydrodewaxing uses a low alpha catalyst and hydrofinishing is accomplished with a catalyst based on the M41S family.

L'invention concerne un procédé de préparation d'huiles de base pour huile lubrifiante à indice de viscosité élevé comprenant les étapes d'hydrotraitement, d'hydrodéparafinage et éventuellement d'hydrofinition. L'hydrotraitement s'effectue dans des conditions telles que la quantité de conversion à 343 ·C est inférieure à celle de 5 % en poids de la charge et que l'augmentation de l'indice de viscosité est inférieure à l'indice de viscosité 4 sur la charge. L'hydrodéparafinage utilise un calatylseur à faible alpha et l'hydrofinition est réalisée à l'aide d'un catalyseur utilisant la famille M41S.

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