| 摘要 |
<p>Fluidized-bed catalytic cracking process for converting a hydrocarbon feed into lighter products comprising the steps of contacting the hydrocarbon feed in a reactor riser (2) with hot regenerated catalyst particles to obtain a gaseous effluent stream with spent catalyst particles dispersed therein; separating the spent catalyst particles from the gaseous effluent stream; passing the spent catalyst particles to a catalyst bed in a vertical stripping zone (13), in which the spent catalyst particles are stripped by contacting the catalyst particles with upwardly flowing steam; discharging (4) the stripped spent catalyst particles to a regenerator, in which coke deposited on the catalyst particles is combusted to obtain hot regenerated catalyst particles and returning the hot regenerated catalyst particles to the reactor riser, wherein the superficial steam velocity in the vertical stripping zone (13) is between 0.3 and 1.0 m/s, and wherein the ratio of the height of the catalyst bed to the diameter of the vertical stripping zone (13) is greater than 3.</p> |
