Delayed coking process for producing anisotropic...

C - Chemistry – Metallurgy – 10 – B

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C10B 55/00 (2006.01) C10B 57/08 (2006.01) C10G 9/00 (2006.01)

Patent

CA 2468711

A delayed coking process wherein substantially all of the coke produced is free-flowing anisotropic shot coke. A coker feedstock, such as a vacuum residuum, is treated with an oxidizing agent, such as air, to increase the level of one or more of asphaltenes, polars, and organically bound oxygen groups. The oxidized feedstock is then heated to coking temperatures and passed to a coker drum for an effective amount of time to allow volatiles to evolve and to produce a substantially free-flowing anisotropic shot coke.

L'invention concerne un procédé de cokéfaction retardée, au cours duquel la majeur partie du coke produit est du coke anisotrope en grenaille à écoulement libre. Une charge d'une unité de cokéfaction, telle qu'un résidu sous vide, est traitée avec un agent oxydant, tel que l'air, de manière à augmenter le niveau d'un ou de plusieurs des éléments parmi lesquels: les asphaltènes, les groupes polaires et les groupes oxygène à liaison organique. La charge oxydée est ensuite chauffée à des températures de cokéfaction, puis elle est passée dans un tambour de l'unité de cokéfaction pendant un laps de temps suffisant pour permettre le développement des volatils et la production d'un coke anisotrope en grenaille à écoulement libre essentiellement.

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