Process to prepare a base oil

C - Chemistry – Metallurgy – 10 – G

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C10G 65/16 (2006.01) C10G 65/00 (2006.01) C10G 65/04 (2006.01)

Patent

CA 2587552

Process to optimize the yield of base oils from a Fischer-Trops.sigma.h derived feed by performing the following steps (a) performing a hydroconversion/hydroisomeri- sation step on part of the Fischer-Tropsch derived feed; (b) performing a hydroconversion/hydroisomerisation step on another part of the Fischer-Tropsch feed at a conversion greater than the conversion in step (a); and (c) isolating by means of distillation a fraction boiling in the base oil range from the two reaction products obtained in steps (a) and (b) and performing a pour point reducing step on said fraction.

La présente invention concerne un processus permettant d'optimiser la production d'huiles de base d'une charge dérivée de Fischer-Tropsch en effectuant les étapes suivantes: (a) réalisation d'une étape d'hydroconversion/hydrosisomérisation sur une partie de la charge dérivée de Fischer-Tropsch, (b) réalisation d'une étape d'hydroconversion/hydroisomérisation sur une autre partie de la charge de Fischer-Tropsch à une conversion de supérieure à la conversion de l'étape (a) et, (c) isolations au moyen d'une distillation d'une fraction en ébullition dans la gamme des huiles de base à partir de deux produits de réaction obtenus dans les étapes (a) et (b) et réalisation d'une étape de réduction de point d'écoulement sur cette fraction.

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