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Performance and Mechanisms of Triethylene Tetramine (TETA) and 2-Amino-2-methyl-1-propanol (AMP) in Aqueous and Nonaqueous Solutions for CO2 Capture
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-12-13 00:00:00 , DOI: 10.1021/acssuschemeng.7b03717 Fan Liu 1 , Guohua Jing 1 , Xiaobin Zhou 1 , Bihong Lv 1 , Zuoming Zhou 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-12-13 00:00:00 , DOI: 10.1021/acssuschemeng.7b03717 Fan Liu 1 , Guohua Jing 1 , Xiaobin Zhou 1 , Bihong Lv 1 , Zuoming Zhou 1
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Nonaqueous amines are currently being explored for energy-efficient postcombustion CO2 capture, but the absorption capacity and regeneration efficiency of most absorbents still need to be further improved. In this work, a mixture of triethylene tetramine (TETA) and 2-amino-2-methyl-1-propanol (AMP) dissolved in ethanol was chosen as a nonaqueous absorbent for CO2 capture and performed with high absorption loading and regeneration efficiency. In addition, the changes of the components during the absorption–desorption process and reaction mechanisms of nonaqueous absorbents were explored by 13C NMR spectroscopy and compared with those of aqueous absorbents. The results showed that TETA/AMP/ethanol had higher absorption loading and regeneration efficiency (3.71 mol kg–1, 95.4%) after the fifth regeneration cycle than TETA/AMP/water (3.54 mol kg–1, 38.8%) when the amine mass concentration was 40 wt %. CO2 capture by TETA/AMP aqueous and nonaqueous solutions proceeded by two different mechanisms. Polycarbamate and alkyl carbonate of C2H5OCO2– formed in the TETA/AMP/ethanol solution, while polycarbamates and HCO3–/CO32– formed in the TETA/AMP/water solution. Moreover, the regeneration efficiency of the nonaqueous solution was higher than that of the aqueous solution because the reaction products were easily decomposed in ethanol, and the regeneration consumption of the organic solvent was lower than that of water.
中文翻译：
三亚乙基四胺（TETA）和2-氨基-2-甲基-1-丙醇（AMP）在水溶液和非水溶液中捕集CO 2的性能和机理
目前正在研究非水胺以提高燃烧后的能量效率，以捕获CO 2，但是大多数吸收剂的吸收能力和再生效率仍需要进一步提高。在这项工作中，选择溶解在乙醇中的三亚乙基四胺（TETA）和2-氨基-2-甲基-1-丙醇（AMP）的混合物作为捕获CO 2的非水吸收剂，并以高吸收负荷和再生效率进行操作。此外，通过13研究了非水吸收剂在吸收-解吸过程中组分的变化和反应机理。用13 C NMR光谱和与水性吸收剂的光谱进行比较。表明，TETA / AMP /乙醇的结果具有更高的吸收装载和再生效率（3.71摩尔千克-1第五再生循环比TETA / AMP /水后，95.4％）（3.54摩尔千克-1，38.8％）时的胺质量浓度为40重量％。TETA / AMP水溶液和非水溶液捕获CO 2的过程有两种不同的机理。氨基甲酸酯和碳酸烷基酯Ç 2 ħ 5 OCO 2 -形成在TETA / AMP /乙醇溶液，而聚氨基甲酸酯和HCO 3 - / CO 3 2-在TETA / AMP /水溶液中形成。此外，非反应溶液的再生效率比水溶液的再生效率高，这是因为反应产物在乙醇中容易分解，并且有机溶剂的再生消耗低于水。
更新日期：2017-12-13
中文翻译：
三亚乙基四胺（TETA）和2-氨基-2-甲基-1-丙醇（AMP）在水溶液和非水溶液中捕集CO 2的性能和机理
目前正在研究非水胺以提高燃烧后的能量效率，以捕获CO 2，但是大多数吸收剂的吸收能力和再生效率仍需要进一步提高。在这项工作中，选择溶解在乙醇中的三亚乙基四胺（TETA）和2-氨基-2-甲基-1-丙醇（AMP）的混合物作为捕获CO 2的非水吸收剂，并以高吸收负荷和再生效率进行操作。此外，通过13研究了非水吸收剂在吸收-解吸过程中组分的变化和反应机理。用13 C NMR光谱和与水性吸收剂的光谱进行比较。表明，TETA / AMP /乙醇的结果具有更高的吸收装载和再生效率（3.71摩尔千克-1第五再生循环比TETA / AMP /水后，95.4％）（3.54摩尔千克-1，38.8％）时的胺质量浓度为40重量％。TETA / AMP水溶液和非水溶液捕获CO 2的过程有两种不同的机理。氨基甲酸酯和碳酸烷基酯Ç 2 ħ 5 OCO 2 -形成在TETA / AMP /乙醇溶液，而聚氨基甲酸酯和HCO 3 - / CO 3 2-在TETA / AMP /水溶液中形成。此外，非反应溶液的再生效率比水溶液的再生效率高，这是因为反应产物在乙醇中容易分解，并且有机溶剂的再生消耗低于水。
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