Patent ID: 9259680
Filing Date: 2016-02-16
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 first regenerator to produce a partially regenerated solvent stream from a lower section of the first regenerator and a first overhead vapor stream from an upper section of the first regenerator, wherein the first overhead vapor stream comprises carrier vapor, H cooling the first overhead vapor stream to condense substantially all of the carrier vapor in the first overhead vapor stream, thereby producing a first 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; feeding the partially regenerated solvent stream to a second regenerator to produce the lean solvent stream from a lower section of the second regenerator and a second overhead vapor stream from an upper section of the second regenerator, wherein the second overhead vapor stream comprises carrier vapor, H cooling a first portion of the second overhead vapor stream to condense substantially all of the carrier vapor in the first portion of the second overhead vapor stream, thereby producing a second overhead 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; producing a second portion of the second overhead vapor stream to the lower section of the first regenerator as a first carrier vapor stream; vaporizing a portion of a liquid stream from the lower section of the second regenerator to produce a second carrier vapor stream; and feeding the second carrier vapor stream to the lower section of the second regenerator.