Targeted hydrogenation hydrocracking

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 45/64 (2006.01) B01D 1/26 (2006.01) C10G 31/06 (2006.01) C10G 65/12 (2006.01) C10G 70/04 (2006.01)

Patent

CA 2709361

This invention is directed to a process scheme in which a partial conversion hydrocracking (HCR) unit, preferably preceded by a hydrotreating unit, feeds unconverted oil to a FCC (fluid catalytic cracking ) unit. Most refineries run the FCC unit at the full capacity for optimal asset utilization. During shutdowns of Residue Desulfurization unit(s) which feed an FCC unit, it is desirable to reduce the conversion in the FCC feed hydrocracker. hi this way, the feed to FCC unit is maximized. Jet and Diesel products that conform to specifications may be produced during low conversion HCR operation. Furthermore, undesirable oversaturation of the unconverted oil (UCO) from the HCR unit feeding the FCC unit can be avoided. Excess hydrogen consumption can also be avoided. Normally, further aromatic saturation of the middle distillate products from a low conversion HCR is achieved in a separate, post treatment, unit.

L'invention porte sur un processus de traitement dans lequel une unité d'hydrocraquage (HCR) à conversion partielle, précédée de préférence d'une unité d'hydrotraitement, alimente une unité de craquage catalytique fluide (FCC) en huile non transformée. La plupart des raffineries exploitent l'unité FCC à sa pleine capacité afin d'arriver à une utilisation optimale des ressources. Lors de l'arrêt des unités de désulfuration de résidus alimentant l'unité FCC, il est souhaitable de réduire la conversion dans l'hydrocraqueur qui alimente l'unité FCC afin de maximiser l'alimentation de ladit unité. Il est possible de produire des carburants aviation et diesel conformes aux normes lorsque l'unité HCR fonctionne avec un faible taux de conversion. Cela permet en outre d'éviter une sursaturation indésirable de l'huile non transformée (UCO) en provenance de l'unité HCR qui alimente l'unité FCC, et de prévenir toute consommation excessive d'hydrogène. La saturation aromatique additionnelle des produits de distillat intermédiaires en provenance de l'unité HCR à faible taux de convesrion s'effectue normalement dans une unité de post-traitement séparée.

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