Patent ID: 8955354
Filing Date: 2015-02-17
Classification: B01D,C10L

Abstract:
1. A process for the recovery of hydrogen sulfide from sour gas through fractionation comprising the steps of: introducing a multi-component feed stream to a first distillation column, wherein the first distillation column is a demethanizer column, wherein the multi-component feed stream comprises carbon dioxide, methane, ethane, propane, and hydrogen sulfide; introducing an alkyl hydrocarbon mixture into the first distillation column, wherein the alkyl hydrocarbon mixture comprises ethane; withdrawing a first vapor overhead stream from the first distillation column wherein the first vapor overhead stream is a methane-enriched stream; withdrawing a first liquid bottoms stream from the first distillation column; introducing the first liquid bottoms stream to a second distillation column, wherein the second distillation column is a CO withdrawing a second vapor overhead stream from the second distillation column, wherein the second vapor overhead stream is a carbon dioxide and ethane-enriched stream; withdrawing a second liquid bottoms stream from the second distillation column, wherein the second liquid bottoms stream is a hydrogen sulfide enriched stream; introducing the second liquid bottoms stream to a third distillation column, wherein the third distillation column is a De-H introducing a first azeotrope breaker into the third distillation column; withdrawing a third vapor overhead stream from the third distillation column, wherein the third vapor overhead stream is a hydrogen sulfide enriched stream; withdrawing a third liquid bottoms stream from the third distillation column, wherein the third liquid bottoms stream is an alkane enriched stream; introducing the third liquid bottoms stream to a fifth distillation column, wherein the fifth distillation column is a debutanizer fractionation column; withdrawing a fifth vapor overhead stream from the fifth distillation column, wherein the fifth vapor overhead stream is enriched in propane and lighter hydrocarbons; withdrawing a fifth liquid bottoms stream from the fifth distillation column, wherein the first azeotrope breaker comprises at least a portion of the fifth liquid bottoms stream; introducing the second vapor overhead stream to a fourth distillation column, wherein the fourth distillation column is a De-CO recycling at least a portion of the fifth liquid bottoms stream to the third distillation column and the fourth distillation column; introducing a second azeotrope breaker to the fourth distillation column, wherein the second azeotrope breaker comprises at least a portion of the fifth liquid bottoms stream; and withdrawing a fourth vapor overhead stream from the fourth distillation column, wherein the fourth vapor overhead stream is a carbon dioxide-enriched stream.