JPS5648250A - Regeneration of catalyst used for contact decomposition of heavy oil containing high-sulfur - Google Patents

Abstract

PURPOSE:To realize a highly profitable regeneration of the titled catalyst without exhausting any sulfur dioxide by fixing the sulfur deposited on the catalyst along with the coke onto the catalyst which is reduced via a partial burning under the reduction state of the coke and in the form of a sulfide and then decomposing the sulfide into the hydrogen sulfide. CONSTITUTION:The raw oil is supplied to the tower 1 through the inlet 2, and thus the fluid floor 3 of the catalyst particle is formed within the tower to perform the contact decomposition. The light-duty oil thus obtained is gathered through the top part 4 along with the gas for formation of the fluid floor. In that case, the coke containing the sulfur is deposited on the catalyst. This catalyst is supplied to the tower 6 through the tube 11, and then the oxygen content gas such as the air or the like is introduced through the supply mouth 7 to give a partial burning to the coke in the state of reduction. Thus the iron in the catalyst is reduced, and the sulfur compound produced due to gasification of the coke is fixed on the catalyst under the reducing state as a sulfide. A part of the catalyst reduced through the tower 6 is circulated to the tower 1 through the tube 5 for a purpose of heat supply. The reduced catalyst with the sulfide fixed is then supplied to the tower 9 via the tube 8 and then given a contact to the steam. Thus the sulfide is decomposed into the hydrogen sulfide to turn the iron into an oxide. In this way, the catalyst can be regenerated.