Novel Non-aqueous Amine Solvents for Biogas Upgrading

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• 作者：Francesco Barzagli ; Sarah Lai ; Fabrizio Mani ; Piero Stoppioni
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：August 21, 2014
• 年：2014
• 卷：28
• 期：8
• 页码：5252-5258
• 全文大小：390K
• ISSN：1520-5029

文摘

Reducing the CO₂ and H₂S contents of biogas is a prerequisite to raise its quality to that of natural gas. The chemical capture of carbon dioxide was accomplished with non-aqueous single 2-amino-2-methyl-1-propanol (AMP), 2-(tert-butylamino)ethanol (TBMEA), 2-(isopropylamino)ethanol (IPMEA), and N-methyl-2,2鈥?iminodiethanol (MDEA), with their 1:1 blends dissolved in either an ethylene glycol/1-propanol mixture or single diethylene glycol monomethyl ether. The gas mixtures used contain either 15 or 40% CO₂ in air, sometimes added with 50 ppm H₂S. We designed two different experimental procedures: (1) separate experiments of CO₂ absorption and desorption aimed at selecting the most efficient amines and (2) continuous cycles of CO₂ absorption (20 掳C) and desorption (90鈥?5 掳C) featuring CO₂ removal efficiency in the range of 89鈥?6%. The CO₂/amine/alcohol equilibria were analyzed by ¹³C nuclear magnetic resonance (NMR) spectroscopy, which allowed us to identify and quantify the carbonated species in solution originated from both amine and alcohol carbonatation. In some continuous cycles of CO₂ absorption, H₂S was selectively captured by aqueous H₂O₂ and separated as either elemental sulfur or CaSO₄.