Method of manufacturing diesel fuel base stock and diesel...

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 65/14 (2006.01) C10G 2/00 (2006.01) C10G 45/58 (2006.01) C10G 47/00 (2006.01) C10L 1/08 (2006.01)

Patent

CA 2700090

Disclosed is a method of manufacturing a diesel fuel base stock improved in low-temperature flowability, including: fractionating in a first fractionator a synthetic oil obtained by Fisher-Tropsch synthesis into at least two fractions of a first middle fraction containing a component having a boiling range corresponding to diesel fuel oil, and a wax fraction containing a wax component heavier than the first middle fraction; hydroisomerizing the first middle fraction by bringing the first middle fraction into contact with a hydroisomerizing catalyst to produce a hydroisomerized middle fraction; hydrocracking the wax fraction by bringing the wax fraction into contact with a hydrocracking catalyst to produce a wax-decomposition component; and fractionating in a second fractionator a mixture of the produced hydroisomerized middle fraction and the produced wax-decomposition component, wherein rectification conditions in the first fractionator and/or rectification conditions in the second fractionator are adjusted to selectively reduce an n-paraffin having 19 or more carbon atoms in a heavy component contained in the diesel fuel base stock. Furthermore, disclosed is a diesel fuel base stock obtained by the manufacturing method.

L'invention concerne un procédé de fabrication d'une base de carburant diesel qui présente une fluidité améliorée à basse température, qui comprend les étapes consistant à : fractionner une huile synthétique FT dans un premier rectificateur en une première fraction intermédiaire et une fraction de cire plus lourde que la première fraction intermédiaire ; hydroisomériser la première fraction intermédiaire pour obtenir une fraction intermédiaire isomérisée ; hydrocraquer la fraction de cire pour obtenir une fraction de cire craquée ; et soumettre un mélange de la fraction intermédiaire isomérisée et de la fraction de cire craquée résultantes à une distillation fractionnée dans un second rectificateur pour obtenir une base de carburant diesel sous la forme d'une seconde fraction intermédiaire. Les conditions de rectification dans le premier rectificateur et/ou le second rectificateur sont régulées de manière à réduire sélectivement la teneur en n-paraffines ayant 19 atomes de carbone ou plus dans les composants lourds de la base de carburant diesel. L'invention concerne également une base de carburant diesel obtenue par le procédé.

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