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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >An Efficient Solid–Liquid Biphasic Solvent for CO2 Capture: Crystalline Powder Product and Low Heat Duty
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An Efficient Solid–Liquid Biphasic Solvent for CO2 Capture: Crystalline Powder Product and Low Heat Duty

机译：用于CO2捕获的有效的固液双相溶剂：结晶粉末产品和低热量

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摘要

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 CO_(2) 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 CO_(2), conforming a perfect performance of CO_(2) capture into the biphasic solvent. The regeneration heat duty of the solvent (1.61 GJ t~(–1) CO_(2)) was approximately 57% less than that of the benchmark monoethanolamine (MEA) because of its perfect performance on CO_(2) 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 CO_(2) capture.
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