Comparative study of solvent properties for carbon dioxide absorption
Comparative study of solvent properties for carbon dioxide absorption
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DOI：
10.1039/c002915g
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发表时间：
2010-01-01
影响因子：
32.5
通讯作者：
Styring, Peter
中科院分区：
文献类型：
--
作者：
Aschenbrenner, Ortrud;Styring, Peter
研究了几种廉价且无毒的低蒸气压溶剂作为吸收烟道气中二氧化碳的替代溶剂的适用性。溶剂包括聚(乙二醇)、聚(乙二醇)醚、聚(氮丙啶)和甘油类物质。使用热重分析仪进行系统研究，研究了热稳定性、二氧化碳溶解度和对氮气的选择性等溶剂特性。报告了纯二氧化碳和氮气以及两种气体的混合物的吸收结果。还讨论了解吸和长期吸附行为。甘油和聚乙二醇对二氧化碳表现出高溶解度。由于溶剂的高粘度，尽管存在有利的胺基团，但聚(乙烯亚胺)中的二氧化碳吸收非常慢。本研究发现 PEG 300 是最好的溶剂，具有较高的二氧化碳溶解度以及对氮气的良好选择性。与最先进的溶剂单乙醇胺相比，PEG 300 的高稳定性、低溶剂损失和低解吸能的优点可能超过其较低的吸收能力，使其成为工业二氧化碳吸收过程的潜在有利溶剂。
Several inexpensive and non-toxic solvents with low vapour pressures were investigated for their suitability as alternative solvents for the absorption of carbon dioxide from flue gas. The solvents include poly(ethylene glycol)s, poly(ethylene glycol) ethers, poly(ethylenimine) and glycerol-based substances. Solvent properties such as thermal stability, solubility of carbon dioxide and selectivity over nitrogen were investigated in a systematic study using a thermogravimetric analyser. Absorption results are reported for pure carbon dioxide and nitrogen as well as a mixture of both gases. Desorption and long-term sorption behaviour are also discussed. Glycerol and poly(ethylene glycol) s show a high solubility of carbon dioxide. Due to the high viscosity of the solvent, carbon dioxide absorption in poly(ethylenimine) is very slow in spite of the presence of favourable amine groups. PEG 300 was found to be the best solvent in this study and shows a high carbon dioxide solubility as well as good selectivity over nitrogen. The advantages of high stability, low solvent loss and low desorption energy of PEG 300 may outweigh its lower absorption capacity compared to the state-of-the-art solvent monoethanolamine, making it a potentially advantageous solvent for industrial carbon dioxide absorption processes.