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首页> 外文期刊>Environmental Science & Technology >Influence of Dissolved Metals on N-Nitrosamine Formation under Amine-based CO_2 Capture Conditions
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Influence of Dissolved Metals on N-Nitrosamine Formation under Amine-based CO_2 Capture Conditions

机译：胺基CO_2捕集条件下溶解金属对N-亚硝胺形成的影响

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摘要

As the prime contender for postcombustion CO_2 capture technology, amine-based scrubbing has to address the concerns over the formation of potentially carcinogenic N-nitrosamine byproducts from reactions between flue gas NO_x and amine solvents. This bench-scale study evaluated the influence of dissolved metals on the potential to form total N-nitrosamines in the solvent within the absorber unit and upon a pressure-cooker treatment that mimics desorber conditions. Among six transition metals tested for the benchmark solvent monoethanolamine (MEA), dissolved Cu promoted total N-nitrosamine formation in the absorber unit at concentrations permitted in drinking water, but not the desorber unit. The Cu effect increased with oxygen concentration. Variation of the amine structural characteristics (amine order, steric hindrance, -OH group substitution and alkyi chain length) indicated that Cu promotes N-nitrosamine formation from primary amines with hydroxyl or carboxyl groups (amino acids), but not from secondary amines, tertiary amines, sterically hindered primary amines, or amines without oxygenated groups. Ethylenediaminetetraacetate (EDTA) suppressed the Cu effect. The results suggested that the catalytic effect of Cu may be associated with the oxidative degradation of primary amines in the absorber unit, a process known to produce a wide spectrum of secondary amine products that are more readily nitrosatable than the pristine primary amines, and that can form stable N-nitrosamines. This study highlighted an intriguing linkage between amine degradation (operational cost) and N-nitrosamine formation (health hazards), all of which are challenges for commercial-scale CO_2 capture technology.
机译：作为燃烧后CO_2捕集技术的主要竞争者，基于胺的洗涤必须解决由烟气NO_x与胺溶剂之间的反应形成潜在致癌的N-亚硝胺副产物的担忧。这项规模规模的研究评估了溶解金属对吸收塔内溶剂中形成总N-亚硝胺的潜能的影响以及模拟解吸塔条件的加压蒸煮处理的影响。在对基准溶剂单乙醇胺（MEA）进行测试的六种过渡金属中，溶解的铜促进了吸收器单元中饮用水中允许的浓度下总N-亚硝胺的生成，但对解吸器单元没有允许。 Cu效应随着氧浓度的增加而增加。胺结构特征（胺顺序，空间位阻，-OH基团取代和烷基链长）的变化表明，Cu促进具有羟基或羧基（氨基酸）的伯胺形成N-亚硝胺，而不是由仲胺，叔胺形成N-亚硝胺胺，位阻伯胺或没有氧化基团的胺。乙二胺四乙酸盐（EDTA）抑制了Cu效应。结果表明，Cu的催化作用可能与吸收器单元中伯胺的氧化降解有关，该过程已知可产生比原始伯胺更易硝化的广谱仲胺产物，并且该过程可以形成稳定的N-亚硝胺。这项研究强调了胺降解（运营成本）和N-亚硝胺形成（健康危害）之间的有趣联系，所有这些都是商业规模的CO_2捕集技术面临的挑战。

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  • 来源
    《Environmental Science & Technology》 |2015年第19期|11974-11981|共8页
  • 作者

    Zimeng Wang; William A. Mitch;

  • 作者单位

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States;

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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