PROCESS AND APPARATUS FOR CONTROL OF MULTISTAGE CATALYST REGENERATION WITH PARTIAL CO COMBUSTION

• Main Authors: OWEN, HARTLEY, SCHIPPER, PAUL HERBERT
• Format: Patent
• Language: English; French
• Published: 16.10.2001
• Edition: 5
• Subjects: BLASTING; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CRACKING HYDROCARBON OILS; FUELS; FURNACES; FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; HEATING; KILNS; LIGHTING; LUBRICANTS; MECHANICAL ENGINEERING; METALLURGY; MINERAL WAXES; OPEN SINTERING OR LIKE APPARATUS; OVENS; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; RETORTS; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THEIR RELEVANT APPARATUS; TRANSPORTING; WEAPONS

A process and apparatus (Figs. 1,2,3 and 4) for con- trolled, multi-stage regeneration of FCC catalyst is dis- closed. A modified high-efficiency catalyst regenerator (80), with a fast fluidized bed coke combustor (62), dilute phase transport riser (83), and second fluidized bed (82) regener- ates the catalyst in at least two stages. The primary stage of regeneration is in the coke combustor (62). Second stage ca- talyst regeneration occurs in the second fluidized bed (82). The amount of combustion air added to both regeneration stages is set to maintain partial CO combustion in both stages. Controlled multi-stage regeneration reduces the steaming or deactivation of catalyst during regeneration, maximizes coke burning capacity of the regenerator (80), and minimizes or eliminates NOx emissions.