Heat of Absorption of CO₂ in Aqueous Solutions of DEEA, MAPA and their Mixture

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• 作者：Muhammad Waseem Arshad ; Nicolas von Solms ; Kaj Thomsen ; Hallvard Fj?sne Svendsen
• 关键词：Heat of absorption ; Calorimeter ; Phase change solvents ; CO2 capture ; DEEA ; MAPA
• 刊名：Energy Procedia
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：37
• 期：Complete
• 页码：1532-1542
• 全文大小：756 K

文摘

A reaction calorimeter was used to measure the differential heat of absorption of CO₂ in phase change solvents as a function of temperature, CO₂ loading and solvent composition. The measurements were taken for aqueous solutions of 2-(diethylamino)ethanol (DEEA), 3-(methylamino)propylamine (MAPA) and their mixture. The tested compositions were 5 M DEEA, 2 M MAPA and their mixture, 5 M DEEA + 2 M MAPA which gives two liquid phases on reacting with CO₂. Experimental measurements were also carried out for 30 % MEA used as a base case. The measurements were taken isothermally at three different temperatures 40, 80 and 120 ¡ãC at a CO₂ feed pressure of 600 kPa. In single aqueous amine solutions, heat of absorption increases with increase in temperature and depends on the

type of amine used. DEEA, a tertiary amine, has lower heat of absorption compared to MAPA being a diamine with primary and secondary amine functional groups. For amine mixtures, heat of absorption is a function of CO₂ loading and temperature. The heat of absorption against CO₂ loading depends on the composition of the amines in the mixture. All the measured data in this work were compared with 30 % MEA at absorption (40 ¡ãC) and desorption (120 ¡ãC) conditions.