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1.发明授权公开(公告)号：US07754471B2
公开(公告)日：2010-07-13
申请号：US11070142
申请日：2005-03-02
CPC分类号： C01B17/046 , B01D53/523 , B01D53/84 , C01B17/0456 , Y02A50/2358 , Y10S435/822
摘要： A process for the recovery of sulfur from an acid gas stream is disclosed. The process includes a Claus sulfur recovery step in combination with a direct reduction step and a biological sulfur recovery step to provide a sweet gas stream having a very low concentration of hydrogen sulfide and sulfur dioxide. The process includes reacting an acid gas steam with oxygen under such oxidation conditions to yield a combustion gas comprising hydrogen sulfide and sulfur dioxide. The combustion gas is reacted under Claus reaction conditions to yield a reaction gas comprising sulfur. Sulfur is recovered from the reaction gas to yield a Claus tail gas comprising hydrogen sulfide and sulfur dioxide. The Claus tail gas is reacted under direct reduction reaction conditions to yield a direct reduction gas comprising sulfur. Sulfur is recovered from the direct reduction reaction gas to yield a tail gas comprising a concentration of hydrogen sulfide. The direct reduction tail gas is contacted with a lean absorbent to thereby remove from the tail gas a portion of the hydrogen sulfide contained therein and to yield a sweet gas and a rich solvent comprising dissolved hydrogen sulfide. The dissolved hydrogen sulfide of the rich solvent is biologically oxidized to elemental sulfur by contacting the rich solvent with sulfur bacteria under suitable biological oxidation conditions.
摘要翻译： 公开了从酸性气流中回收硫的方法。 该方法包括克劳斯硫回收步骤以及直接还原步骤和生物硫回收步骤，以提供具有非常低浓度的硫化氢和二氧化硫的甜味气流。 该方法包括在这样的氧化条件下使酸性气体蒸汽与氧气反应以产生包含硫化氢和二氧化硫的燃烧气体。 燃烧气体在克劳斯反应条件下反应，得到含硫的反应气体。 从反应气体中回收硫，得到包含硫化氢和二氧化硫的克劳斯尾气。 克劳斯尾气在直接还原反应条件下反应，得到包含硫的直接还原气。 从直接还原反应气体中回收硫，得到包含硫化氢浓度的尾气。 直接还原尾气与贫吸收剂接触，从而从尾气中除去其中所含的硫化氢的一部分，并产生甜气体和含有溶解硫化氢的富溶剂。 通过在合适的生物氧化条件下使富溶剂与硫细菌接触，将富溶剂的溶解硫化氢生物氧化成元素硫。
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2.发明授权公开(公告)号：US07351392B2
公开(公告)日：2008-04-01
申请号：US11070117
申请日：2005-03-02
CPC分类号： B01D53/8618 , B01D53/84 , Y02A50/2358 , Y10S423/17
摘要： A combined process for the recovery of sulfur from an acid gas stream. The combined process includes both a Claus unit and a unit for treating the Claus tail gas with caustic to remove hydrogen sulfide therefrom and to biologically oxidize the hydrogen sulfide using certain types of sulfur bacteria to make elemental sulfur. The combined process provides for an exceptionally low concentration of hydrogen sulfide in the finally treated sweet gas.
摘要翻译： 用于从酸性气体流中回收硫的组合方法。 组合方法包括Claus单元和用于用苛性碱处理Claus尾气以从其中除去硫化氢并用某些类型的硫细菌生物氧化硫化氢以制造元素硫的单元。 组合的方法在最终处理的甜气中提供了极低浓度的硫化氢。
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