Figure Captions
Figure 1. Experimental set-up for steady state experiments. (1) mass flowmeter/controller, (2) bubble column, (3) peristaltic pump, (4) heater, (5) condenser, (6) packed column, (7) reboiler, (8) cooler, (9) data acquisition software.
Figure 2. Influence of diamine (DMEDA) concentration upon absorption curves and carbon dioxide loading. QG =0.2 L·min-1. () CB = 0.2 M; () CB = 0.6 M; () CB = 1.2 M.
Figure 3. Effect of gas flow rate upon absorption curves using DMEDA solvent. CB = 0.6 M. () QG =0.1 L·min-1; () QG =0.2 L·min-1; () QG =0.3 L·min-1.
Figure 4. Effect of mixture ratio upon absorption curves and carbon dioxide loading. CB=0.6 M. QG=0.2 L·min-1. [DMEA]/[MEA] ratio: () 1; () 5.
Figure 5. Comparison between absorption rate of amines blend and individual amine solutions. QG = 0.3 L·min-1. CB = 0.6 M. () Amines blend (50%/50%); () MEA; () DMEA.
Figure 6. Comparison of experimental behaviors (absorption rate and carbon dioxide loading) between amines blend and diamine solvents. QG = 0.3 L·min-1. CB = 1.2 M. () amines blend (50%/50%); () diamine.
Figure 7. 13C NMR spectra corresponding to samples from carbon dioxide absorption in DMEDA aqueous solution. QG = 0.3 L·min-1. CB = 0.6 M.
Figure 8. 13C NMR spectra corresponding to samples from carbon dioxide absorption in MEA and DMEA blend solvent. MEA/DMEA ratio = 1. QG = 0.3 L·min-1. CB = 0.6 M.
Figure 9. 13C NMR spectra corresponding to samples from carbon dioxide absorption in MEA and DMEA blend solvent. MEA/DMEA ratio = 5. QG = 0.3 L·min-1. CB = 0.6 M.
Figure 10. Influence of liquid phase and gas flow rates upon carbon dioxide absorption rate. CB = 1.2 M. () QL = 96 mL·min-1; () QL = 72 mL·min-1; () QL = 45 mL·min-1.
Figure 11. Influence of gas flow rate and type of solvent upon carbon dioxide absorption rate. QL = 72 mL·min-1. CB = 1.2 M. () diamine, () MEA/DMEA ratio = 1, () MEA/DMEA ratio = 5.