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An Efficient Solid–Liquid Biphasic Solvent for CO2 Capture: Crystalline Powder Product and Low Heat Duty
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-08-31 , DOI: 10.1021/acssuschemeng.0c04616 Zhibiao Chen 1 , Guohua Jing 1 , Bihong Lv 1 , Zuoming Zhou 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-08-31 , DOI: 10.1021/acssuschemeng.0c04616 Zhibiao Chen 1 , Guohua Jing 1 , Bihong Lv 1 , Zuoming Zhou 1
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A nonaqueous, phase-change absorbent of 2-amino-2-methyl-1-propanol (AMP)/piperazine (PZ) and environmentally friendly solvent dipropylene glycol dimethyl ether (DME) fixes a number of issues suffered by a solid–liquid biphasic solvent, such as high viscosity of the saturated solution and difficult separation and regeneration of the viscous solid. The solid phase occupies 43% of the total volume while attributes about 94% of the total loading (0.87 mol mol–1) of the solution. Beside the formation of AMP-carbamate and PZ-carbamate according to zwitterions mechanism, the coupling products of AMP/PZ-carbamate are also found in the crystal, which helps to reduce the desorption temperature during the regeneration. Because of low solubility, self-aggregation, and high lattice energy in DME, the CO2 products precipitate and form a white crystalline powder in the lower phase of the solution. Meanwhile, the solid precipitation helps the bulk solution to keep a lower partial pressure and higher diffusivity of CO2, conforming a perfect performance of CO2 capture into the biphasic solvent. The regeneration heat duty of the solvent (1.61 GJ t–1 CO2) was approximately 57% less than that of the benchmark monoethanolamine (MEA) because of its perfect performance on CO2 capture, such as high absorption loading, high regeneration efficiency, and low amount of rich phase required for regeneration. The novel absorbent has a great potential for green and sustainable CO2 capture.
中文翻译：
一种有效的固液两相CO 2捕集溶剂：结晶粉末产品和低热负荷
2-氨基-2-甲基-1-丙醇（AMP）/哌嗪（PZ）和环境友好型溶剂二丙二醇二甲醚（DME）的非水相变吸收剂解决了固液两相所面临的许多问题溶剂，例如饱和溶液的高粘度以及粘性固体的分离和再生困难。固相占总体积的43％，而溶液的总载量（0.87 mol mol –1）约占94％。除了根据两性离子机理形成AMP-氨基甲酸酯和PZ-氨基甲酸酯以外，还在晶体中发现AMP / PZ-氨基甲酸酯的偶联产物，这有助于降低再生过程中的解吸温度。由于DME中的低溶解度，自聚集和高晶格能，CO 2产物沉淀并在溶液的下层相中形成白色结晶粉末。同时，固体沉淀有助于本体溶液保持较低的分压和较高的CO 2扩散率，从而具有将CO 2捕获到双相溶剂中的完美性能。溶剂（1.61 GJ t –1 CO 2）的再生热负荷比基准单乙醇胺（MEA）的再生热负荷低约57％，这是因为其在CO 2捕获方面具有完美的性能，例如高吸收负荷，高再生效率，再生所需的富相量少。新型吸收剂具有绿色和可持续的CO 2捕集的巨大潜力。
更新日期：2020-09-28
中文翻译：
一种有效的固液两相CO 2捕集溶剂：结晶粉末产品和低热负荷
2-氨基-2-甲基-1-丙醇（AMP）/哌嗪（PZ）和环境友好型溶剂二丙二醇二甲醚（DME）的非水相变吸收剂解决了固液两相所面临的许多问题溶剂，例如饱和溶液的高粘度以及粘性固体的分离和再生困难。固相占总体积的43％，而溶液的总载量（0.87 mol mol –1）约占94％。除了根据两性离子机理形成AMP-氨基甲酸酯和PZ-氨基甲酸酯以外，还在晶体中发现AMP / PZ-氨基甲酸酯的偶联产物，这有助于降低再生过程中的解吸温度。由于DME中的低溶解度，自聚集和高晶格能，CO 2产物沉淀并在溶液的下层相中形成白色结晶粉末。同时，固体沉淀有助于本体溶液保持较低的分压和较高的CO 2扩散率，从而具有将CO 2捕获到双相溶剂中的完美性能。溶剂（1.61 GJ t –1 CO 2）的再生热负荷比基准单乙醇胺（MEA）的再生热负荷低约57％，这是因为其在CO 2捕获方面具有完美的性能，例如高吸收负荷，高再生效率，再生所需的富相量少。新型吸收剂具有绿色和可持续的CO 2捕集的巨大潜力。
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