Patent ID: 9718047
Date: 2017-08-01
CPC Classifications: B01J,C10K,Y02P

Claim:
1. A method for separating a chlorine-containing species from an aqueous solution of the chlorine-containing species in a catalytic hydrocarbon conversion process, the method comprising the steps of: oxidizing a spent chloride-containing hydrocarbon conversion catalyst, the spent hydrocarbon conversion catalyst comprising a hydrocarbon residue formed thereon, wherein the oxidizing forms a flue gas comprising chlorine-containing species, water, and oxides of carbon; contacting the flue gas with a water scrubbing stream to dissolve at least a portion of the chlorine-containing species in the water scrubbing stream to form a liquid aqueous acid solution; separating and venting un-dissolved gases from the liquid aqueous acid solution wherein said un-dissolved gases comprise less than 0.01 ppm of a chloro-species; contacting the liquid aqueous acid solution with a hygroscopic liquid to generate a dehydrated hydrogen chloride gas; and contacting the dehydrated hydrogen chloride gas with additional spent chloride-containing hydrocarbon conversion catalyst to sorb chlorine onto the additional spent chloride-containing hydrocarbon conversion catalyst.