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首页> 外文期刊>Environmental Science & Technology >Regulating Phase Separation Behavior of a DEEA-TETA Biphasic Solvent Using Sulfolane for Energy-Saving CO_2 Capture
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Regulating Phase Separation Behavior of a DEEA-TETA Biphasic Solvent Using Sulfolane for Energy-Saving CO_2 Capture

机译：使用环丁砜调节DEEA-TETA双相溶剂的相分离行为以节省二氧化碳

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Biphasic solvents containing mixed amines have a phase separation behavior and energy-efficient regeneration for CO2 capture. However, the trade-off between the CO2 absorption capacity and the volume ratio of the CO2-rich phase presents a critical challenge to the reducing potential in regeneration energy consumption. In this study, sulfolane was proposed to regulate the phase separation behavior of a N,N-diethylethanolamine (DEEA)-triethylenetetramine (TETA) biphasic absorbent by simultaneously decreasing the volume ratio and increasing the CO2 loading of the rich phase, without sacrificing the high CO2 capacity. In the DEEA-TETA-sulfolane biphasic absorbent, sulfolane acted as a phase splitter and physical activator. The replacement of a part of H2O by hydrophobic sulfolane contributed to a substantial decrease in the volume ratio of the rich phase from 83 to 39% and an increase in CO2 loading of the rich phase from 3.10 to 4.92 mol/L. The regeneration heat decreased to 1.81 GJ/t CO2, 26.4% less than DEEA-TETA, and 54.6% less than the 5 M monoethanolamine system. Moreover, by promoting the mass transfer coefficient of CO2 in DEEA-TETA-sulfolane to 1.8 times the original DEEA-TETA system, sulfolane was validated as a physical activator. Our study provides a promising strategy for regulating the phase separation behavior of biphasic solvents and enhancing the regeneration energy efficiency for CO2 capture.
机译：包含混合胺的双相溶剂具有相分离行为，并且能高效回收二氧化碳。然而，CO 2吸收能力与富CO 2相的体积比之间的折衷对降低再生能量消耗的潜力提出了严峻的挑战。在这项研究中，提出了环丁砜可在不牺牲高相的同时降低体积比和增加富相的CO2含量来调节N，N-二乙基乙醇胺（DEEA）-三亚乙基四胺（TETA）双相吸收剂的相分离行为的问题。二氧化碳容量。在DEEA-TETA-环丁砜双相吸收剂中，环丁砜充当分相剂和物理活化剂。用疏水性的环丁砜代替部分H2O导致富相的体积比从83％大幅降低到39％，富相的CO2负载量从3.10 mol / L增加到4.92 mol / L。再生热降至1.81 GJ / t CO2，比DEEA-TETA低26.4％，比5 M单乙醇胺系统低54.6％。此外，通过将DEEA-TETA-环丁砜中CO2的传质系数提高到原始DEEA-TETA系统的1.8倍，环丁砜被证实是一种物理活化剂。我们的研究为调节双相溶剂的相分离行为和提高捕获二氧化碳的再生能效提供了一种有前途的策略。

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  • 来源
    《Environmental Science & Technology》 |2019年第21期|12873-12881|共9页
  • 作者

    Wang Lidong; Liu Shanshan; Wang Rujie; Li Qiangwei; Zhang Shihan;

  • 作者单位

    North China Elect Power Univ Dept Environm Sci & Engn Hebei Key Lab Power Plant Flue Gas Multipollutant Baoding 071003 Peoples R China|North China Elect Power Univ Coll Environm Sci & Engn MOE Key Lab Resources & Environm Syst Optimizat Beijing 102206 Peoples R China;

    Zhejiang Univ Technol Coll Environm Hangzhou 310014 Zhejiang Peoples R China;

  • 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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