Patent ID: 7384611
Filing Date: 2008-06-10
Classification: B01D,B01J,C01B

Abstract:
1. A plant comprising: a catalyst regenerator configured to produce an O a reducing gas generator that is configured to receive at least a portion of the effluent waste gas and to form oxygen-depleted effluent gas; a hydrogenation reactor fluidly coupled to the catalyst regenerator, receiving a mixed feed gas comprising at least a portion of the oxygen-depleted effluent waste gas, and producing a hydrotreated feed gas comprising hydrogen sulfide; a contactor fluidly coupled to the hydrogenation reactor and using a solvent that removes the hydrogen sulfide, thereby producing a hydrogen sulfide depleted offgas; a recycle loop fluidly coupling the contactor to the hydrogenation reactor such that the recycle loop provides at least a portion of the hydrogen sulfide depleted offgas; from the contactor to the effluent waste gas, to thereby form the mixed feed gas, wherein the mixed feed gas has a sulfur dioxide concentration of more than 0% and no more than 2.5%; and wherein the plant is further configured to allow another portion of the hydrogen sulfide depleted offgas to leave the plant.