SLURRY HYDROCARBON SYNTHESIS PROCESS WITH MULTISTAGE CATALYST REJUVENATION

摘要

A REVERSIBLY DEACTIVATED HYDROCARBON SYNTHESIS CATALYST IN A HYDROCARBON SYNTHESIS SLURRY (18) IS REJUVENATED BY SUCCESSIVELY PASSING THE SLURRY THROUGH AT LEAST TWO REJUVENATION STAGES EXTERNAL OF THE SLURRY REACTOR (10), EACH OF WHICH COMPRISES A REJUVENATION ZONE FOLLOWED BY AN OFFGAS REMOVAL ZONE. THIS IN ACCOMPLISHED BY USING A LIFT PIPE (34) OUTSIDE THE REACTOR INTO WHICH SLURRY FROM THE REACTOR IS PASSED AND CONTACTS A CATALYST REJUVENATING GAS TO PARTIALLY REJUVENATE THE CATALYST PARTICLES AND FORM A REJUVENATION OFFGAS. THE GAS AND SLURRY MIXTURE ARE PASSED INTO A VESSEL (12) IN WHICH THE GAS IS REMOVED FROM THE SLURRY. REJUVENATION GAS IS BUBBLED INTO THE SLURRY IN THE VESSEL TO FURTHER REJUVENATE THE CATALYST. A GAS REMOVING DOWNCOMER (28) REMOVED GAS FROM THE SLURRY IN THE VESSEL BEFORE IT IS PASSED BACK INTO THE REACTOR. THE REJUVENATION GAS ALSO ACTS AS A LIFT GAS IN THE LIFT PIPE.FIG.1