Process for regenerating catalyst particles

Abstract

A process for regenerating catalyst particles is disclosed. The process includes the steps: (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 adsorbent in a first adsorption zone, removing halogen from the first portion of the regeneration zone effluent, and withdrawing from the first adsorption zone a first adsorption zone effluent; (c) contacting the first adsorption zone effluent with a water removing material to create a first water-depleted stream; and (d) passing the first water-depleted stream to the regeneration zone. Other embodiments include different orders of the steps.

1 . A process for regenerating catalyst particles, the process comprising:
 withdrawing a regeneration zone effluent comprising halogen from a regeneration zone, wherein the regeneration zone comprises catalyst particles comprising halogen;   contacting a first portion of the regeneration zone effluent with a water removing material to create a first water-depleted stream;   contacting the first water-depleted stream with adsorbent in an adsorption zone, removing halogen from the first water-depleted stream, and withdrawing from the adsorption zone an adsorption zone effluent; and   passing at least a portion of the adsorption zone effluent to the regeneration zone.   
     
     
         2 . 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.   
     
     
         3 . The process of  claim 2  wherein the water removing material is within the adsorption zone. 
     
     
         4 . The process of  claim 2  wherein the water removing material comprises a membrane selectively permeable to water. 
     
     
         5 . The process of  claim 2  wherein feed flow of the first portion of the regeneration zone effluent is tangential to a surface of the water removing material. 
     
     
         6 . The process of  claim 2  wherein the water removing material comprises a fluorocarbon having sulfonic acid groups. 
     
     
         7 . The process of  claim 2  wherein the water removing material comprises tetrafluoroethylene-perfluoro-3,6-dioxa-4-methyl-7-octenesulfonic acid copolymer. 
     
     
         8 . The process of  claim 2  wherein the water removing material is in a membrane form, a tubular form, or a bead form. 
     
     
         9 . 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.   
     
     
         10 . The process of  claim 9  further comprising:
 (d) contacting a second portion of the regeneration zone effluent with adsorbent in an adsorption zone, removing halogen from the second portion of the regeneration zone effluent, and withdrawing from the adsorption zone an adsorption zone effluent; and 
 (e) passing at least a portion of the adsorption zone effluent comprising halogen to the regeneration zone. 
 
     
     
         11 . The process of  claim 10  wherein step (d) comprises:
 contacting the second portion of the regeneration zone effluent with a second water removing material to create a second water-depleted stream; and 
 contacting the second water-depleted stream with adsorbent in the adsorption zone. 
 
     
     
         12 . The process of  claim 10  wherein step (e) comprises:
 contacting the adsorption zone effluent with a second water removing material to create a second water-depleted stream; and 
 passing the second water-depleted stream to the regeneration zone.