Regeneration vessel adsorption zone and process for adsorbing halogen-containing material and sampling catalyst

A process for regenerating catalyst in a regenerator vessel, the process comprising:

• providing the regenerator vessel comprising:
• a plurality of catalyst nozzles disposed at a top portion of the regenerator vessel;
• a first gas outlet associated with a chlorination zone;
• a second gas outlet associated with a combustion zone;
• and
• a drying zone in fluid communication with an air heater located in a bottom portion of the regenerator vessel;
• wherein the first gas outlet is configured to withdraw a first gas stream from the chlorination zone;
• wherein the second gas outlet is configured to withdraw a second gas stream from the combustion zone;
• withdrawing a portion of the second gas stream to form a regenerator vent gas stream;
• introducing the regenerator vent gas stream to the top portion of the regenerator vessel at a vent gas inlet port;
• contacting the regenerator vent gas stream with catalyst in an adsorption zone disposed in the top portion of the regenerator vessel;
• withdrawing a treated regenerator vent gas stream from the top portion of the regenerator vessel at a vent gas outlet port;
• and
• discharging the treated regenerator vent gas stream to the atmosphere.

A method of retrofitting a head portion of a regenerator vessel, the method comprising:

• unloading catalyst from the regenerator vessel;
• disconnecting piping associated with the head portion, the piping comprising a chlorination zone outlet, a combustion zone outlet, and catalyst transfer piping;
• removing the head portion and a portion of an inner screen;
• installing a new head portion having a vent gas inlet port, a vent gas outlet port, an annular outer baffle, and an annular inner baffle;
• connecting a vent gas inlet line, a vent gas outlet line, a vent gas cooler, an air preheater, to the new head portion;
• and
• reloading catalyst into the regenerator vessel.