Catalyst regenerators and methods for regenerating catalysts
a catalyst and catalyst technology, applied in the field of catalyst regenerators and methods regenerating catalysts, can solve the problems of high catalyst loading, abrade equipment exposed, and gas is abrasive,
Inactive Publication Date: 2016-03-03
UOP LLC
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The patent text describes catalyst regenerators and methods of using them. The methods involve combusting coke from the catalyst in a second stage regenerator to produce a second flue gas. The second stage regenerator includes a second combustion chamber with a smaller cross-sectional area than the first combustion chamber. The first flue gas, produced by the first stage regenerator, is then vented into the second combustion chamber through a vent tube with a discharge point. This allows for a more efficient transfer of the first flue gas to the second stage regenerator. The technical effect of this method is improved regeneration of the catalyst with reduced energy consumption and increased production efficiency.
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[0016]The following detailed description is merely exemplary in nature and is not intended to limit the application or uses of the embodiment described. Furthermore, there is no intention to be bound by any theory presented in the preceding technical field, background, brief summary, or the following detailed description.
[0017]Catalyst regenerators and methods for regenerating catalysts using the same are provided herein. Deactivated catalyst is transferred from a riser to a first stage regenerator in an RFCC unit, where some of the coke on the catalyst is combusted. Oxygen is limited in the first stage regenerator so combustion is incomplete, and some of the oxygen is provided from a second flue gas from the second stage regenerator. Some of the oxygen is also provided in air or other gases from an air grid. The first stage regenerator is positioned directly over a second stage regenerator, where a top of the second stage regenerator separates the first and second stage regenerator...
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Abstract
Catalyst regenerators and methods of their use are provided. A method includes combusting coke from the catalyst in a second stage regenerator to produce a second flue gas, where the second stage regenerator includes a second combustion chamber and a top having a top cross-sectional area. The coke is partially combusted from the catalyst in a first stage regenerator with a first combustion chamber having a first combustion chamber cross-sectional area greater than the top cross-sectional area. The first stage regenerator is positioned above the top of the second stage regenerator. The first combustion chamber includes a cylindrical section directly over the top and an annular section surrounding the cylindrical section. The second flue gas is vented into the first stage regenerator through a vent tube, and a portion of the second flue gas is dispersed into the annular section of the first combustion chamber.
Description
TECHNICAL FIELD[0001]The present disclosure generally relates to catalyst regenerators and methods regenerating catalysts using the same, and more particularly relates to two stage catalyst regenerators for residue fluid catalytic crackers and methods for regenerating catalysts using the same.BACKGROUND[0002]Fluid catalytic cracking (FCC) is primarily used to convert high boiling, high molecular weight hydrocarbons into lower boiling, lower molecular weight compounds. The lower molecular weight compounds include gasoline, olefinic compounds, liquid petroleum gas (LPG), diesel fuel, etc. An FCC unit typically uses a catalyst that is repeatedly deactivated and regenerated in a riser and a regenerator, respectively. Air is used to combust the coke from the deactivated catalyst in the regeneration process, and produces combustion gases such as carbon dioxide and water. Partial combustions gases like carbon monoxide may also be produced. Many FCC units use the energy generated from burni...
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IPC IPC(8): B01J38/34B01J8/30B01J38/40
CPCB01J8/30B01J2208/00938B01J38/34B01J38/40B01J8/1863B01J8/26B01J8/0055B01J8/003B01J2208/00902B01J2208/00929B01J2208/00991C10G11/182B01J29/06B01J29/90
Inventor MAKHANIA, MINAZPANCHAL, DHARMESH, CHUNILALWALKER, PATRICK, D.
Owner UOP LLC