Heat of Absorption and Specific Heat of Carbon Dioxide in Aqueous Solutions of Monoethanolamine,3-piperidinemethanol and Their Blends

• Published in: Energy procedia 2014, Vol.63, p.2070-2081
• Main Authors: Abdulkadir, Abdurahim, Rayer, Aravind V., Quang, Dang Viet, Hadri, Nabil El, Dindi, Abdallah, Feron, Paul H.M., Abu-Zahra, Mohammad R.M.
• Format: Article
• Language: English
• Subjects: 3PM; Calorimeter; Heat capacities; Heat of absorption; MEA; Post-Combustion Capture
• ISSN: 1876-6102; 1876-6102
• DOI: 10.1016/j.egypro.2014.11.223

In this work the thermodynamic properties of monoethanlonamine (MEA), 3-piperidinemethanol (3PM) and their blends were measured and evaluated. The heat of absorption of the solution of CO2 in the aqueous solution of single amines (5M MEA,3M MEA, 2M MEA, 2M 3PM and 3M 3PM) and aqueous amine blends (2M MEA+ 3M 3PM, 3M MEA+2M 3PM, 3M MEA+3M 3PM) were measured isothermally using a commercially available micro-reaction calorimeter (μRC) at three different temperatures (313.15, 333.15 and 353.15) K and at different CO2 loading capacity. The vapour liquid equilibrium apparatus was also used to obtain different samples of loaded CO2 molCO2/molamine and their corresponding heat of absorption was measured using the micro-reaction calorimeter. In addition, the heat capacities of the above amines were also measured from 303.15K to 353.15K at an interval of 5K. The calorimetric measurements of the heat of absorption at temperature (313.15 oK) indicated that the (3M MEA+2M 3PM) blend has the lowest absorption enthalpy with 75.58kJ/mol CO2 at 0.56 molCO2/molamine (max loading capacity) than (5M-MEA) with a reported value of 87.827kJ/molCO2 at 0.51 molCO2/molamine which corresponds the maximum loading capacity of (5M-MEA). The (3M MEA+3M 3PM) exhibited the lowest heat capacities among the measured blends of MEA and 3PM. 5M MEA was used as a base case for all the experimental measurements for the heat of absorption.