FLUID BED COKING PROCESS WITH DECOUPLED COKING ZONE AND STRIPPING ZONE

摘要

A fluid coking unit for converting a heavy oil feed to lower boiling products by thermal has a centrally-apertured annular baffle at the top of the stripping zone below the coking zone to inhibit recirculation of solid particles from the stripping zone to the coking zone. By inhibiting recirculation of the particles from the stripping zone to the coking zone, the temperatures of the two zones are effectively decoupled, enabling the coking zone to be run at a lower temperature than the stripping zone to increase the yield of liquid products.

主权项

1. A fluid coking unit for converting a heavy oil feed to lower boiling products by thermal cracking in a fluid bed, comprises:
(i) a reactor having a coking zone to contain a fluidized bed of solid particles into which the heavy oil feed is introduced; (ii) a scrubbing zone located above the coking zone into which vapor phase product from the coking zone is passed; (iii) a stripping zone, located at the bottom of the coking zone, for stripping at least a portion of the hydrocarbons which adhere to the solid particles passing into the stripping zone from the coking zone; (iv) a heater communicating with the stripping zone to receive solid particles from the bottom of the stripping zone; (v) a conduit for passing hot solid particles from the heater to the coking zone; (vi) a recirculation conduit for recycling hot solid particles from the heater to the stripping zone; with (vii) a centrally-apertured annular baffle at the top of the stripping zone to inhibit recirculation of solid particles from the stripping zone to the coking zone.