Systems and methods for regenerating a spent catalyst

A method for regenerating coked catalyst particles, comprising:

• heating a hydrocarbon and a coke precursor in the presence of catalyst particles to provide a cracked hydrocarbon and coked catalyst particles, wherein the coked catalyst particles include carbon deposited on at least a portion thereof;
• selectively separating the cracked hydrocarbon and the coked catalyst particles to provide a hydrocarbon product and coked catalyst particles;
• mixing the coked catalyst particles with a carrier fluid to provide a mixture;
• introducing the mixture to a dilute phase catalyst zone disposed above a dense phase catalyst zone in a regenerator;
• distributing the mixture of the dilute phase catalyst zone onto an upper surface of the dense phase catalyst zone;
• introducing a gas to a lower portion of the dense phase catalyst zone;
• combusting at least a portion of the carbon deposited on the coked catalyst particles to provide a flue gas, heat, and a regenerated catalyst;
• and
• recycling at least a portion of the regenerated catalyst to provide at least a portion of the catalyst particles.

A method for regenerating coked catalyst particles, comprising:

• heating a hydrocarbon in the presence of catalyst particles to provide a cracked hydrocarbon and coked catalyst particles, wherein the coked catalyst particles include carbon deposited on at least a portion thereof;
• selectively separating the cracked hydrocarbon and the coked catalyst particles to provide a hydrocarbon product and coked catalyst particles;
• mixing the coked catalyst particles with a carrier fluid to provide a mixture;
• introducing the mixture to a dilute phase catalyst zone disposed above a dense phase catalyst zone in the regenerator, wherein the carrier fluid comprises from 5% to about 90% of the total amount of oxygen introduced to the regenerator;
• distributing the mixture of the dilute phase catalyst zone onto an upper surface of the dense phase catalyst zone;
• introducing a gas to a lower zone of the dense phase catalyst zone;
• introducing a coke precursor to the dense phase catalyst zone, the dilute phase catalyst zone, the upper surface of the dense phase catalyst zone, the mixture, or any combination thereof;
• combusting at least a portion of the carbon deposited on the catalyst and at least a portion of the coke precursor to provide a flue gas, heat, and a regenerated catalyst;
• and
• recycling at least a portion of the regenerated catalyst to provide at least a portion of the catalyst particles.