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首页> 外文期刊>Environmental Science & Technology >Decomposition of Nitrosamines in CO_2 Capture by Aqueous Piperazine or Monoethanolamine
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Decomposition of Nitrosamines in CO_2 Capture by Aqueous Piperazine or Monoethanolamine

机译：哌嗪或单乙醇胺水溶液捕获CO_2中亚硝胺的分解

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摘要

Amine scrubbing is an efficient method for carbon capture and sequestration, but secondary amines present in all amine solvents can form carcinogenic nitrosamines. Decomposition kinetics for n-nitrosopiperazine (MNPZ), nitrosodiethanolamine (NDELA), and nitroso-(2-hydroxyethyl) glycine (NHeGly) were measured over a range of temperature, base concentration, base strength, and CO_2 loading pertinent to amine scrubbing. MNPZ and NDELA decomposition is first order in the nitrosamine, half order in base concentration, and base-catalyzed with a Bronsted slope β=0.5. The activation energy is 94,106, and 112 kJ/mol for MNPZ, NDELA, and NHeGly, respectively. MNPZ readily decomposes at 150 ℃ in 5 M piperazine, making thermal decomposition an important mechanism for MNPZ control. However, NHeGly and NDELA are too stable at 120 ℃ in 7 M monoethanolamine (MEA) for thermal decomposition to be important. Base treatment during reclaiming could rapidly and selectively decompose NHeGly and NDELA to mitigate nitrosamine accumulation in MEA.
机译：胺洗涤是一种有效的碳捕获和封存方法，但是所有胺溶剂中都存在的仲胺会形成致癌的亚硝胺。在与胺洗涤有关的温度，碱浓度，碱强度和CO_2负载范围内，测量了n-亚硝基哌嗪（MNPZ），亚硝基二乙醇胺（NDELA）和亚硝基-（2-羟乙基）甘氨酸（NHeGly）的分解动力学。 MNPZ和NDELA分解在亚硝胺中为一级，碱浓度为半级，并以布朗斯台德斜率β= 0.5进行碱催化。 MNPZ，NDELA和NHeGly的活化能分别为94,106和112 kJ / mol。 MNPZ在5 M哌嗪中于150℃容易分解，使热分解成为MNPZ控制的重要机理。然而，NHeGly和NDELA在120 M的7 M单乙醇胺（MEA）中过于稳定，以至于热分解显得不重要。回收过程中的碱处理可以快速选择性地分解NHeGly和NDELA，以减轻MEA中亚硝胺的积累。

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  • 来源
    《Environmental Science & Technology》 |2014年第10期|5996-6002|共7页
  • 作者

    Nathan A. Fine; Paul T. Nielsen; Gary T. Rochelle;

  • 作者单位

    The University of Texas at Austin, McKetta Department of Chemical Engineering, 200 E Dean Keeton St. Stop C0400, Austin, Texas 78712-1589, United States;

    The University of Texas at Austin, McKetta Department of Chemical Engineering, 200 E Dean Keeton St. Stop C0400, Austin, Texas 78712-1589, United States;

    The University of Texas at Austin, McKetta Department of Chemical Engineering, 200 E Dean Keeton St. Stop C0400, Austin, Texas 78712-1589, 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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