Process for regenerating catalyst particles

A process for adsorbing hydrogen chloride (HCl) from a regeneration vent gas, the process comprising:

• cooling the regeneration vent gas from a regeneration zone;
• passing the cooled regeneration vent gas to an adsorption zone that is spaced apart from the regeneration zone;
• adsorbing HCl from the regeneration vent gas onto a spent catalyst in the adsorption zone to enrich the spent catalyst with HCl to provide HCl-rich catalyst and deplete HCl from the regeneration vent gas to provide HCl-lean regeneration vent gas;
• purging the HCl-lean regeneration vent gas as an effluent gas;
• removing water from the regeneration vent gas or the HCl-lean regeneration vent gas by contacting with a water removing material;
• and
• passing the HCl-rich catalyst to the regeneration zone.

A process for regenerating catalyst particles, the process comprising:

• (a) withdrawing a regeneration zone effluent comprising halogen from a regeneration zone, wherein the regeneration zone contains catalyst particles comprising halogen;
• (b) contacting a first portion of the regeneration zone effluent with a water removing material to create a first water-depleted stream;
• and
• (c) passing the first water-depleted stream to the regeneration zone, and at least partially regenerating at least a portion of the catalyst particles in the regeneration zone and removing at least a portion of the halogen from the catalyst particles in the regeneration zone.