The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 29, 1976
Filed:
Dec. 23, 1974
Joel S Bittensky, Port Arthur, TX (US);
Edward W Dillingham, Neederland, TX (US);
William R Menzies, III, Houston, TX (US);
Roy E Pratt, Groves, TX (US);
Texaco Inc., New York, NY (US);
Abstract
An improved method is disclosed for controlling the temperature of the fluidized dense catalyst phase of the regeneration zone in a fluid catalytic cracking unit, wherein the coke laydown in the reaction zone is at a level such that the coke concentration of the partially deactivated catalyst from the reaction zone is not sufficient to provide the heat required to maintain the controlled temperature in the fluidized dense catalyst phase of the regeneration zone. In this method, torch oil is added to the partially deactivated catalyst in the spent catalyst transfer line in an amount such that the catalyst charged to the regeneration zone contains sufficient combustible material to provide the heat necessary to maintain the fluidized dense catalyst phase of the regeneration zone at the controlled temperature. Also, as a part of this improved method, the flow of oxygen-containing regeneration gas to the regeneration zone is regulated to provide sufficient oxygen to effect substantially complete combustion of the coke and torch oil to carbon dioxide and to provide an oxygen concentration in the regeneration flue gas within the range of from about 1 to about 10 mol%. Maintaining the oxygen concentration in the flue gas within this range results in a flue gas having a carbon monoxide content of about 500 ppm, or less, and preferably 10 ppm or less.