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US 7,431,824 B2Granted
Process for recycling an active slurry catalyst composition in heavy oil upgrading
AssigneeChevron U.S.A. Inc.
InventorsKaidong Chen, Julie Chabot
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Abstract
The instant invention is directed to a process employing slurry catalyst compositions in the upgrading of heavy oils. The slurry catalyst composition is not permitted to settle, which would result in possible deactivation. The slurry is recycled to an upgrading reactor for repeated use and products require no further separation procedures for catalyst removal.
Claims15
A process for upgrading heavy oils which employs a slurry catalyst composition, comprising the following steps:
- (a) combining, in an upgrading reactor under hydroprocessing conditions, heavy feed, hydrogen gas, fresh catalyst slurry composition, and recycle slurry composition;
- (b) passing the effluent of the upgrading reactor to a separation zone wherein products boiling at temperatures up to 900° F. are passed overhead and wherein the slurry catalyst is not allowed to settle;
- (c) passing the material remaining in the separation zone from step (b) to a constantly stirred catalyst storage tank;
- and
- (d) passing at least a portion of the material in the constantly stirred catalyst storage tank back to the upgrading reactor of step (a).
2 more elements
Dependencies are inferred from the claim text.