METHOD AND APPARATUS FOR WITHDRAWAL OF SMALL CATALYST PARTICLES IN FCC SYSTEMS

IMPROVED METHOD AND APPARATUS FOR WITHDRAWAL OF SMALL CATALYST PARTICLES IN FCC SYSTEMS Disclosed is a method of and apparatus for reducing the level of extremely small catalyst particles ("fines") in an FCC system by temporarily retaining particles separated from the secondary cyclone sep...

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Hauptverfasser:	SCHATZ, KLAUS W, OWEN, HARTLEY, HADDAD, JAMES H
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BLASTING 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 PETROLEUM, GAS OR COKE INDUSTRIES 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 WEAPONS
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Beschreibung
Zusammenfassung:	IMPROVED METHOD AND APPARATUS FOR WITHDRAWAL OF SMALL CATALYST PARTICLES IN FCC SYSTEMS Disclosed is a method of and apparatus for reducing the level of extremely small catalyst particles ("fines") in an FCC system by temporarily retaining particles separated from the secondary cyclone separator in a reactor vessel or catalyst regenerator, These particles can be intermittently withdrawn from the temporary retaining area in order to achieve particle flow at a low volume rate, which takes them out of the active catalyst inventory within the reactor/regenerator system. The intermittent withdrawing of catalyst "fines" reduces the particulate contamination both in flue gas exhausted to the atmosphere from the catalyst regenerator and in the main column bottom (MCB) products from the fractionation stage. Preferred embodiments include intermittent withdrawal of "fines" from either the regenerator or the reactor vessels and the secondary cyclones contained in each of these vessels.