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公开(公告)号：US09845539B2
公开(公告)日：2017-12-19
申请号：US14649134
申请日：2013-12-20
CPC分类号： C25B1/16 , B01D53/1425 , B01D53/1468 , B01D53/1493 , B01D53/52 , B01D53/73 , B01D53/78 , B01D2251/304 , B01D2252/10 , B01D2257/304 , C25B1/00 , C25B15/08
摘要： A chemical process captures and convert hydrogen sulfide (H2S) gas into elemental sulfur, polysulfide, sulfur dioxide and/or sulfuric acid while regenerating sodium hydroxide capture agent for further use in an initial H2S capture step. Processing may include initial sodium hydroxide scrubbing of gas streams containing H2S, electrochemical regeneration of the sodium hydroxide from sodium hydrosulfide or sodium sulfide, recovery of sulfur and/or sulfur dioxide from the electrochemical processing, and production of sulfuric acid from such sulfur and/or sulfur dioxide.
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公开(公告)号：US10233081B2
公开(公告)日：2019-03-19
申请号：US15319990
申请日：2015-06-17
IPC分类号： C25B1/00 , C01B17/06 , C01B17/22 , B01D53/52 , B01D53/78 , B01D53/73 , B01D53/14 , C01D7/00 , C01D7/12 , C25B1/16
摘要： Hydrogen sulfide is scrubbed from a gas stream to prepare dissolved alkali metal sulfide or hydrosulfide, which is used to prepare feed electrolyte solution for electrochemical processing to generate alkali metal hydroxide in catholyte and polysulfide in anolyte, which may be recovered from an electrochemical reactor and which may be subjected to further processing to precipitate elemental sulfur. Aqueous scrubbing solution may include alkali metal carbonate capture agent to capture hydrogen sulfide in alkali metal bicarbonate The gas stream may include carbon dioxide in addition to hydrogen sulfide, and a ratio of dissolved alkali metal carbonate to bicarbonate may be increased prior to electrochemical processing.
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