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首页> 外文期刊>Separation and Purification Technology >Insights on natural gas purification: Simultaneous absorption of CO2 and H2S using membrane contactors
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Insights on natural gas purification: Simultaneous absorption of CO2 and H2S using membrane contactors

机译：天然气净化的见解：使用膜接触器同时吸收CO2和H2S

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Natural gas plays a critical role in today's energy supply. However, before it canie utilized as a fuel for chemical processing or energy generation, it must undergo extensive treatment to remove all contaminants such as CO2 and H2S. This paper presents the simultaneous absorption of CO2 and H2S from natural gas using aqueous potassium carbonate solutions as the absorbent solvent while utilizing hollow fiber membrane contactors. The reaction mechanisms of CO2 and H2S absorption into aqueous carbonate solutions are considered complicated due to the several species involved in the reaction scheme that undergo reversible reactions. A comprehensive 2D mathematical model has been developed for the simultaneous absorption of CO2 and H2 S while considering reversible and equilibrium reactions rates. The model results showed that lower concentrations of carbonate solutions resulted in higher absorption rates, while the presence of high bicarbonate concentrations in the solution was the main incentive for the enhanced reversible reactions and thus, lower absorption rates were achieved. A complete removal of CO2 and H2S in a gas mixture containing 5% CO2,5% H2S, and 90% CH4 was possible by using two membrane modules in series while using fresh 1M carbonate solution in each module. The first module removes all H2S in the system and small amounts of CO2, while the second module removes the remaining CO2 coming out from the first module. This scheme is favorable than using only one membrane module, because the majority of bicarbonate ions that favors the reversible reaction, are generated from the consumption of H2S with carbonate solution. Therefore in the second module, CO2 can be consumed significantly due to the absence of bicarbonate ions.
机译：天然气在当今的能源供应中起着至关重要的作用。但是，在将其用作化学加工或能源生产的燃料之前，必须对其进行广泛的处理以去除所有污染物，例如CO2和H2S。本文提出了利用碳酸钾水溶液作为吸收剂同时利用中空纤维膜接触器同时从天然气中吸收CO2和H2S的方法。由于参与可逆反应的反应方案中涉及的几种物质，因此将CO2和H2S吸收到碳酸盐水溶液中的反应机理被认为是复杂的。已经开发了一个综合的二维数学模型，用于同时吸收CO2和H2 S，同时考虑了可逆和平衡反应速率。模型结果表明，较低浓度的碳酸盐溶液可导致较高的吸收速率，而溶液中存在较高的碳酸氢盐浓度是增强可逆反应的主要诱因，因此可实现较低的吸收速率。通过串联使用两个膜组件，同时在每个组件中使用新鲜的1M碳酸盐溶液，可以完全去除含5％CO2、5％H2S和90％CH4的气体混合物中的CO2和H2S。第一个模块除去系统中的所有H2S和少量的CO2，而第二个模块除去从第一个模块排出的剩余CO2。该方案比仅使用一个膜组件有利，因为大多数有利于可逆反应的碳酸氢根离子都是由碳酸盐溶液消耗H2S产生的。因此，在第二模块中，由于不存在碳酸氢根离子，因此可以大量消耗CO2。

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