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A Novel Dual-Stage Phase Separation Process for CO2 Absorption into a Biphasic Solvent with Low Energy Penalty
Environmental Science & Technology ( IF 11.4 ) Pub Date : 2021-09-13 , DOI: 10.1021/acs.est.1c01622
Xiaowei Zhou 1 , Yao Shen 2 , Fan Liu 2 , Jiexu Ye 1 , Xinya Wang 1 , Jingkai Zhao 1 , Shihan Zhang 1 , Lidong Wang 3 , Sujing Li 2 , Jianmeng Chen 1
Affiliation  

An amine-based biphasic solvent is promising to cut down the energy penalty of CO2 capture. However, the high viscosity of the CO2-enriched solvent retards its industrial application. This work proposed a novel dual-stage phase separation process using a triethylenetetramine and 2-(diethylamino)ethanol blend as a biphasic solvent, which separates a certain proportion of CO2-enriched phase during CO2 absorption to reduce its viscosity. Experimental results showed that the proposed dual-stage phase separation process improved the phase separation behavior and effectively enhanced the absorption rate by 49% at 50 °C, when 50 vol % CO2-enriched phase was separated at 0.3 mol mol–1. Kinetic analysis showed that the absorption rate was mainly controlled by liquid-side mass transfer. The regeneration heat of the dual-stage phase separation process cut down the energy penalty by 33% compared with the monoethanolamine-based process. Compared with the conventional biphasic solvent-based process, the heat duty was further declined by 8%. The 1H nuclear magnetic resonance analysis showed that the dual-stage phase separation process could effectively control the generation of absorption products and intensify the interphase migration of tertiary amines.

中文翻译:

一种新的双阶段相分离工艺,用于将 CO2 吸收到双相溶剂中,并具有低能量损失

一种基于胺的双相溶剂有望减少 CO 2捕获的能量损失。然而,富含CO 2 的溶剂的高粘度阻碍了其工业应用。这项工作提出了一种新的双阶段相分离工艺,使用三亚乙基四胺和2-(二乙氨基)乙醇混合物作为双相溶剂,在CO 2吸收过程中分离一定比例的富CO 2相以降低其粘度。实验结果表明,当在 0.3 mol mol –1浓度下分离出50 vol % CO 2富集相时,所提出的双级相分离工艺改善了相分离行为,并在 50 °C 下有效地将吸收率提高了 49%. 动力学分析表明,吸收速率主要受液侧传质控制。与基于单乙醇胺的工艺相比,双级相分离工艺的再生热量减少了 33% 的能量损失。与传统的双相溶剂型工艺相比,热负荷进一步降低了 8%。的1和1 H核磁共振分析表明,该双级相分离过程可有效控制的吸收产物的产生和加强叔胺的相间迁移。
更新日期:2021-11-16
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