Configurations and methods for processing high pressure acid gases with zero emissions
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United States of America Patent
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Feb 27, 2018
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Oct 27, 2015
filing date -
Oct 27, 2015
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Abstract
Plants, processes, and methods for reducing the H2S and CO2 contents of shale gasses from fields that produce shale gasses having varying H2S and CO2 contents are provided. Acid gas enters an absorber and is scrubbed using a lean physical solvent, producing a treated gas and a rich physical solvent. The H2S content of the treated gas is further reduced in an amine absorber, producing a pipeline gas and a semi-lean amine. The pipeline gas contains lower levels of H2S and CO2 than gas produced using a polishing bed. A physical solvent regeneration unit regenerates the lean physical solvent from the rich physical solvent for feeding into the absorption unit. An amine regeneration unit regenerates the lean amine from the semi-lean amine for feeding into the amine absorber. Contemplated plants may further comprise a Claus Unit or a Redox unit for oxidizing H2S to elemental sulfur.
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