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首页> 外文期刊>Separation and Purification Technology >The removal of hydrogen sulfide from gas streams using an aqueous metal sulfate absorbent Part I.The absorption of hydrogen sulfide in metal sulfate solutions
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The removal of hydrogen sulfide from gas streams using an aqueous metal sulfate absorbent Part I.The absorption of hydrogen sulfide in metal sulfate solutions

机译：使用含水金属硫酸盐吸收剂从气流中除去硫化氢第一部分。金属硫酸盐溶液中硫化氢的吸收

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The desulfurization of gas streams using aqueous iron(II)sulfate(Fe(II)SO_4),zinc sulfate(ZnSO_4)and copper sulfate(CUSO_4)solutions as washing liquor is studied theoretically and experimentally.The desulfurization is accomplished by a precipitation reaction that occurs when sulfide ions and metal ions are brought into contact with each other.A thermodynamic study has been used to determine a theoretical operating window,with respect to the pH of the scrubbing solution,in which the metal sulfate solution can react with hydrogen sulfide(H_2S),but not with carbon dioxide(CO_2)from the gas or hydroxide ions from the scrubbing solution.When the absorption is carried out in this window the proposed process should be capable of removing H_2S from the gas stream without uptake of CO_2 or the formation of metal hydroxides.The pH operating window increases in the order of iron,zinc to copper.Experimental verification showed that the proposed process indeed efficiently removes H_2S when an aqueous Fe(II)SO_4,ZnSO_4 or CUSO_4 solution is used as absorbent.However,for an efficient desulfurization the lower pH of the experimental pH operating window using the Fe(II)SO_4 or ZnSO_4 solution was higher than indicated by thermodynamics.The reason for this must probably be attributed to a reduced precipitation rate at decreasing pH.When a CUSO_4 solution is used as washing liquor the solution can efficiently remove H_2S over the entire pH range studied(as low as pH=1.4).In this case only the upper pH boundary of the operating window(that indicates the possible formation of copper hydroxide or copper carbonates)seems to be a relevant limit in practice.The laboratory experiments indicate that the absorption of H_2S in a CUSO_4 solution,at the experimental conditions tested,is a gas phase mass transfer limited process.This allows a high degree of H_2S removal in a relatively compact contactor.In addition to the lab scale experiments the potential of the new desulfurization process has also been successfully demonstrated for an industrial biogas using a pilot scale packed bed reactor operated with a fresh and regenerated CUSO_4 solution.This study indicates that the precipitation reaction of metal sulfates with H_2S can be used successfully in a(selective)desulfurization process,and that it can be an attractive alternative to the desulfurization methods currently used.
机译：从理论上和实验上研究了以硫酸铁（II）（Fe（II）SO_4），硫酸锌（ZnSO_4）和硫酸铜（CUSO_4）溶液作为洗涤液对气流进行脱硫的方法。热力学研究已确定相对于洗涤溶液pH的理论操作窗口，在该操作窗口中，金属硫酸盐溶液可与硫化氢发生反应（当硫化物离子与金属离子相互接触时发生）。 H_2S），但不能与洗涤液中的气体中的二氧化碳（CO_2）或洗涤溶液中的氢氧根离子一起使用。当在此窗口中进行吸收时，建议的方法应能够从气流中除去H_2S，而不会吸收CO_2或pH操作窗口按铁，锌到铜的顺序增加。实验验证表明，所提出的方法的确能有效地去除水溶液中的H_2S。我们使用Fe（II）SO_4，ZnSO_4或CUSO_4溶液作为吸收剂。但是，为了有效脱硫，使用Fe（II）SO_4或ZnSO_4溶液的实验pH操作窗口的较低pH值高于热力学表明的原因。当使用CUSO_4溶液作为洗涤液时，该溶液可以在整个研究的pH范围内（低至pH = 1.4）有效去除H_2S。在实际操作中，操作窗口的pH上限（表明可能形成氢氧化铜或碳酸铜）似乎是一个相关的限制。实验室实验表明，在测试的实验条件下，CUSO_4溶液中H_2S的吸收为气相传质受限的过程。这允许在相对紧凑的接触器中高度去除H_2S。除了实验室规模的实验外，新脱硫过程的潜力还在于使用中试规模填充床反应器在新鲜和再生的CUSO_4溶液下成功地对工业沼气进行了证明。这项研究表明，金属硫酸盐与H_2S的沉淀反应可成功用于（选择性）脱硫过程，并且它可以替代目前使用的脱硫方法。

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