2.1. Materials
Carbon dioxide was supplied by Praxair with a purity of 99.998%. The chemical solvents employed in carbon dioxide chemical absorption experiments were based on the use of N,N-dimethylethylenediamine (DMEDA), monoethanolamine (MEA) and dimethylethanolamine (DMEA) that were purchased from Alfa Aesar with purities of 95%, ≥99% and ≥98% respectively. Aqueous solutions of these amines were prepared on mass with double distilled water.