Patent ID: 9339756
Filing Date: 2016-05-17
CPC Classification: B01D,C01B,Y02P

Claim Text:
1. A method for regenerating a rich solvent stream comprising solvent, H 2 S, CO 2 , and an amount of at least one volatile contaminant by using a carrier vapor to remove at least a portion of each of the H 2 S, the CO 2 , and the at least one volatile contaminant, thereby producing a lean solvent stream, wherein the H 2 S, CO 2 , and the at least one contaminant removed are to be fed to a Claus sulfur recovery unit of the type including a two-zone reaction furnace comprising first and second reaction zones, the method comprising: feeding the rich solvent stream to a regenerator to produce the lean solvent stream from a lower section of the regenerator, an overhead vapor stream from an upper section of the regenerator, and a middle vapor stream from a middle section of the regenerator, wherein the overhead vapor stream comprises carrier vapor, H cooling the overhead vapor stream to condense substantially all of the carrier vapor in the overhead vapor stream, thereby producing an overhead condensate stream and a first acid gas stream comprising H feeding the first acid gas stream to the first reaction zone of the two-zone reaction furnace; cooling the middle vapor stream to condense substantially all of the carrier vapor in the middle vapor stream, thereby producing a middle condensate stream and a second acid gas stream comprising H feeding the second acid gas stream to the second zone of the two-zone reaction furnace; vaporizing a portion of a liquid stream from the lower section of the regenerator to produce a carrier vapor stream; and feeding the carrier vapor stream to the regenerator.