Development of a Promising Biphasic Absorbent for Postcombustion CO2 Capture: Sulfolane+2-(Methylamino)ethanol + H2O
Development of a Promising Biphasic Absorbent for Postcombustion CO2 Capture: Sulfolane+2-(Methylamino)ethanol + H2O
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开发用于燃烧后 CO2 捕获的有前景的双相吸收剂：环丁砜 2-(甲基氨基)乙醇 H2O
DOI：
10.1021/acs.iecr.0c02389
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发表时间：
2020
影响因子：
4.2
通讯作者：
Liang Zhiwu
中科院分区：
文献类型：
--
作者：
Lv Juan;Liu Sen;Ling Hao;Gao Hongxia;Olson Wilfred;Li Qiang;Bairq Zain Ali Saleh;Liang Zhiwu
开发了一种新型环丁砜/仲胺两相吸收剂-环丁砜/2-甲胺乙醇（MAE）溶液，用于燃烧后CO2捕集（PCC）。令人惊讶的是，与传统的5 M单乙醇胺（MEA）水溶液相比，使用4 M/5 M环丁砜/MAE溶液节省了约60%的CO2汽提能耗（EC）。首先，我们从理论上证明了环丁砜基两相溶液中的MAE提高了CO2吸收速率，在相变点处具有高CO2负载，这可能是CO2汽提的节能。综合比较了6种环丁砜/MAE两相溶液的相变行为、核磁共振（NMR）谱、吸收速率和解吸性能，确定4 M/5 M环丁砜/MAE为环丁砜/MAE两相CO2捕集的最佳摩尔比。此外，不同温度下的吸附和解吸实验表明，较低的温度（110 ~ 120 °C）有利于CO2的脱除和节能。此外，与5 M MEA溶液相比，4 M/5 M环丁砜/MAE溶液实现了非常低的能量消耗（EC），并且汽提CO2的量与5 M MEA和5 M MAE溶液的相似。
A new sulfolane/secondary amine biphasic absorbent, sulfolane/2-methylaminoethanol (MAE) solution, was developed for postcombustion CO2capture (PCC). Surprisingly, using a 4M/5M sulfolane/MAE solution saves about 60% energy consumption (EC) for CO2stripping when compared with traditional aqueous 5M monoethanolamine (MEA) solutions. First, we theoretically proved that MAE in sulfolane-based biphasic solution improves the CO2absorption rate with high CO2loading at the phase-changing point, which could be energy-saving for CO2stripping. Based on a comprehensive comparison of the phase-changing behavior, nuclear magnetic resonance (NMR) spectra, absorption rate, and desorption performance, the 4M/5M sulfolane/MAE was determined to be the optimal molar ratio among six sulfolane/MAE biphasic solutions for CO2capture. In addition, the absorption and desorption experiments with various temperatures revealed that relatively low temperature (ranging from 110 to 120 °C) was favorable for CO2removal and energy-saving. Furthermore, the 4M/5M sulfolane/MAE solution achieved a very low energy consumption (EC) compared with that of 5M MEA solution, and the stripped CO2amount is similar to that of 5M MEA and 5M MAE solutions.