Gas circulation method for moving bed catalyst regeneration zones
AssigneeUop LLC
InventorArthur R. Greenwood
Life of this patent
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Abstract
A method is disclosed for regenerating particulate catalyst used in a hydrocarbon conversion process such as catalytic reforming. The method is especially applicable to moving bed reactor systems. The catalyst being regenerated slowly moves downward as a dense bed which is contacted with different gas streams at different elevations within the regeneration zone. The invention involves employing a portion of relatively hot combustion gas as a heating gas stream, with the remainder of the combustion gas being cooled and recycled to the combustion zone. This eliminates the need to employ a heater to provide a suitable heating gas stream.
Claims17
A process for regenerating particulate catalyst which comprises the steps of:
- (a) passing used catalyst into a regeneration zone and downward through the regeneration zone as a compact bed;
- (b) contacting the used catalyst with an oxygen-containing gas stream in a combustion zone located within the regeneration zone at conditions which result in the combustion of carbon present on the used catalyst and thereby producing a combustion gas stream, which is withdrawn from the regeneration zone, and low-carbon catalyst;
- (c) passing the low-carbon catalyst downward through a temperature adjustment zone located within the regeneration zone and therein contacting the low-carbon catalyst with a temperature adjusting gas stream;
- (d) passing the low-carbon catalyst downward through a drying zone located within the regeneration zone and therein contacting the low carbon catalyst with a drying gas stream;
- (e) compressing at least a major portion of the combustion gas stream, and thereby producing a first process gas stream;
- (f) passing a first aliquot portion of the first process gas stream into the temperature adjustment zone as the previously referred to temperature adjusting gas stream;
- and,
- (g) cooling a second aliquot portion of the first process gas stream and then passing the second aliquot portion of the first process stream into the combustion zone as the previously referred to oxygen-containing gas stream.
A process for regenerating solid catalyst used in the reaction zone of a moving bed hydrocarbon conversion process which comprises the steps of:
- (a) passing used catalyst which has been withdrawn from the reaction zone of a hydrocarbon conversion process into a unitary catalyst regeneration zone and downward through the regeneration zone as a compact bed;
- (b) contacting the used catalyst with an oxygen-containing gas stream in a combustion zone at conditions which result in the combustion of carbon present on the used catalyst and the production of a combustion gas stream, which is withdrawn from the regeneration zone, and low-carbon catalyst;
- (c) passing the low-carbon catalyst downward into and through a heating zone located within the regeneration zone, and therein contacting the low carbon catalyst with a heating gas stream;
- (d) passing the low-carbon downward into and through a chlorination zone located within the regeneration zone, and therein contacting the low carbon catalyst with a chlorination gas stream which comprises a chlorine-containing substance;
- (e) withdrawing low carbon catalyst from the regeneration zone;
- (f) pressurizing at least a major portion of the combustion gas stream and producing thereby a relatively high pressure first process gas stream;
- (g) passing a first aliquot portion of the first process stream into the heating zone as the previously referred to heating gas stream;
- and,
- (h) cooling a second aliquot portion of the first process stream by indirect heat exchange, and then passing the second portion of the first process stream into the combustion zone as the previously referred to oxygen-containing gas stream.
Dependencies are inferred from the claim text.