Multistage removal of heteroatoms and wax from distillate fuel

Details Multistage removal of heteroatoms and wax from distillate fuel Multistage removal of heteroatoms and wax from distillate fuel

C - Chemistry, Metallurgy

10

G

C10G 65/04 (2006.01)

Patent

CA 2543842

A distillate fuel feed is hydrotreated to remove heteroatoms and then separated into light and heavy hydrotreated fractions, with the heavy fraction catalytically dewaxed to improve low temperature properties. The hydrotreating and dewaxing are conducted in separate stages, which may be in the same reactor vessel. Fresh hydrogen may be passed into the dewaxing stage, with the dewaxing stage gaseous effluent then passed into the hydrotreating stage to provide hydrogen for the hydrotreating. Existing hydrotreating reaction vessels and facilities may be retrofitted to add one or more dewaxing stages.

Selon la présente invention, on hydrotraite une charge de combustible distillé afin d'éliminer des hétéroatomes et on sépare ladite charge en fractions légères et lourdes hydrotraitées. On déparaffine de manière catalytique ladite fraction lourde afin d'améliorer les propriétés à basse température. On réalise l'hydrotraitement et le déparaffinage à des étages séparés, et on peut les réaliser dans la même cuve de réacteur. On peut acheminer de l'hydrogène frais à l'étage de déparaffinage, auquel on passe un effluent gazeux dans l'étage d'hydrotraitement en vue de fournir de l'hydrogène à l'hydrotraitement. On peut mettre en place des installations et des cuves de réaction d'hydrotraitement existantes afin d'ajouter au moins un étage de déparaffinage.

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