Among various CO2 capture processes, the aqueous amine-based absorption process is considered the most promising for near-term deployment. However, the performance evaluation of newly developed solvents still requires complex and time-consuming procedures, such as pilot plant tests or the development of a rigorous simulator. Absence of accurate and simple calculation methods for the energy performance at an early stage of process development has lengthened and increased expense of the development of economically feasible CO2 capture processes. In this paper, a novel but simple method to reliably calculate the regeneration energy in a standard amine-based carbon capture process is proposed. Careful examination of stripper behaviors and exploitation of energy balance equations around the stripper allowed for calculation of the regeneration energy using only vapor-liquid equilibrium and caloric data. Reliability of the proposed method was confirmed by comparing to rigorous simulations for two well-known solvents, monoethanolamine (MEA) and piperazine (PZ). The proposed method can predict the regeneration energy at various operating conditions with greater simplicity, greater speed, and higher accuracy than those proposed in previous studies. This enables faster and more precise screening of various solvents and faster optimization of process variables and can eventually accelerate the development of economically deployable CO2 capture processes.

Secondary amines have been proposed as potential solvents for CO2 capture. In this study, the CO2 solubility of three secondary alkanolamine aqueous solutions, 2-(butylamino)­ethanol (BAE), 2-(isopropylamino)­ethanol (IPAE), and 2-(ethylamino)­ethanol (EAE), were measured with a pressure range of 0.02 to 395 kPa at 40, 80, and 120 °C. A static method based on an equilibrium cell unit was used for measurements in high CO2 equilibrium partial pressure regions at over 1 kPa, while the flow method based on a modified gas sparging reactor unit proposed by Kim et al.(2017) was employed for measurements in low pressure regions under 1 kPa. Two amine concentrations, 15 and 30 wt %, were considered for each amine, and their CO2 solubility was represented by the Kent-Eisenberg model. The cyclic CO2 absorption capacity and heat of the reaction for the three secondary alkanolamines were compared with those of monoethanolamine (MEA).

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