Multi-stage hydrocracker with kerosene recycle

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 65/02 (2006.01) C10G 65/10 (2006.01) C10G 65/12 (2006.01) C10G 65/14 (2006.01) C10G 65/18 (2006.01)

Patent

CA 2487381

This invention relates to a multi-stage process for hydroprocessing gas oils. Preferably, each stage possesses at least one hydrocracking zone. The second stage and any subsequent stages possess an environment having a low heteroatom content. Light products, such as naphtha, kerosene and diesel, may be recycled from fractionation (along with light products from other sources) to the second stage (or a subsequent stage) in order to produce a larger yield of lighter products, such as gas and naphtha. Subsequent zones are maintained at a lower pressure than that of the first zone, thereby reducing operating expenses.

L'invention concerne un processus à plusieurs étages permettant l'hydrocraquage des gasoils. Chaque étage comprend de préférence au moins une zone d'hydrocraquage. Le second étage et tous les étages suivants comprennent un milieu présentant une proportion réduite d'hétéroatomes. Des produits légers tels que le naphta, le kérosène et le diesel peuvent être recyclés après fractionnement (simultanément avec des produits légers provenant d'autres sources), vers le second étage (ou un des étages suivants) de manière à augmenter la production de produits plus légers tels que gaz et naphta. Les zones suivantes sont maintenues à une pression inférieure à celle de la première zone, de manière à réduire les charges d'exploitation.

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