Evaluation of a Third Generation Single-Component Water-Lean Diamine Solvent for Post-Combustion CO₂ Capture

This study describes a comprehensive evaluation of a recently developed water-lean diamine solvent, N1-(2-ethoxyethyl)-N2, N2-diisopropylethane-1,2-diamine (2-EEDIPEDA), to probe its potential post-combustion CO 2 capture performance. This evaluation includes (1) fundamental sorption characterization such as vapor–liquid equilibria, sorption kinetics, and viscosity impacts; (2) continuous capture characterization using a laboratory-scale flow system using a flue gas simulant; and (3) technoeconomic analysis of the capture process at the industrial scale with projections for critical capture performance metrics. Using this evaluation, we compare the performance of 2-EEDIPEDA to our current leading water-lean amine-based solvent, 2-EEMPA, using the same baseline process plant configuration/pricing. From this comparison, we observe a lower total cost of capture as low as $46.8/tonne CO 2 with 2-EEDIPEDA (20% cheaper than Cansolv), as a direct result of solvent chemistry tuning leading to notable cost savings.