Process to prepare a lubricating base oil

C - Chemistry – Metallurgy – 10 – G

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C10G 65/16 (2006.01)

Patent

CA 2440157

Process to prepare two or more base oil grades, which base oil grades having different kinematic viscosity's at 100~C from a waxy paraffinic Fischer- Tropsch product having a content of non-cyclic iso-paraffins of more than 70 wt% by (a) obtaining from the waxy paraffinic Fischer-Tropsch product a distillate fraction having a viscosity corresponding to one of the desired base oil products, (b) performing a catalytic dewaxing step using the distillate fraction obtained in step (a) as feed, (c) separating the lower boiling compounds from the dewaxed product obtained in step (b) in order to obtain the desired base oil, and (d) repeating steps (a)-(c) for each base oil.

L'invention concerne un procédé permettant de préparer deux ou plusieurs types d'huile de base ayant des viscosités cinématiques différentes à 100 ·C, à partir d'un produit de Fischer-Tropsch paraffinique et paraffineux ayant un taux d'isoparaffines non cycliques de plus de 70 % en poids. Ce procédé consiste : (a) à tirer du produit de Fischer-Tropsch paraffinique et paraffineux une fraction de distillat ayant une viscosité correspondant à l'un des produits d'huile de base voulus, (b) à procéder à un déparaffinage catalytique à l'aide de la fraction de distillat obtenue dans l'étape (a) sous forme de charge, (c) à séparer les composés à point d'ébullition bas du produit déparaffiné obtenu dans l'étape (b) afin d'obtenir l'huile de base voulue et (d) à renouveler les étapes (a)-(c) pour chaque huile de base.

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