||Heat capacity measurements of amine-water solutions used for Post Combustion Carbon dioxide Capture applications
||Kuusela, Johanna (Department of Chemical Engineering, Lund University)
||Stenby, Erling Halfdan (CERE – Center for Energy Ressources Engineering, Department of Chemistry, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Thomsen, Kaj (CERE – Center for Energy Ressources Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
||Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
||The purpose of this study has been to measure specific heat capacities for amine-water solutions that can be used as absorbent solutions in post combustion carbon dioxide capture technology. Heat capacity data for the absorbent solutions are important regarding the energy consumption in the plant and especially when regenerating the absorbent because this is the most energy consuming step in the process which requires heat for the carbon dioxide to be desorbed from the absorbent. At present there is a lack of heat capacity data for several amine solutions in literature and the existing data can be scarce.
A method with a heat flow micro calorimeter has been used to measure heat capacities for amine solutions of MEA and AMP at 10 and 30 weight percent respectively and with different loadings (mol CO2/mol amine) of carbon dioxide.
The heat capacity measurement results of this study were compared with literature data and values calculated with the extended UNIQUAC program. The experimental results were fitted to different curves in Matlab and curves with all the replicate measurements were made in the program Origin.
The measurement results received from this study sometimes showed an unexpected tendency to have an increased heat capacity of the solution after a certain amount of carbon dioxide had been added to the sample.
When omitting certain experimental points, a decreasing trend for the heat capacity as a function of carbon dioxide loading could in some cases be observed.
||Technical University of Denmark (DTU) : Kgs. Lyngby, Denmark
Creation date: 2010-09-20
Update date: 2010-09-20