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Thermodynamic characterisation of aqueous alkanolamine and amine solutions for acid gas processing by transferable molecular models

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  • Pereira, Luís M.C.
  • Llovell, Fèlix
  • Vega, Lourdes F.

Abstract

The development of new alkanolamines/amines is a topic which has attracted a great deal research interest, particularly as absorbents for the removal of acid gases from industrial sources and CO2 capture applications. One of the major challenges when evaluating the techno-economic performance of selected new single amines or blends is the lack of experimental data on the thermophysical properties required for a reliable process design and simulation. In this contribution, a robust theoretical framework for the description of key thermophysical properties of aqueous solutions of single and mixed alkanolamines/amines at relevant gas separation process conditions is proposed. The approach is based on the coupling of the Free-Volume Theory and the Density Gradient Theory with a molecular-based equation of state (soft-SAFT) for the integrated modelling of phase behaviour, enthalpies, densities, viscosities and interfacial tensions. The alkanolamines and amines investigated differ in their family and structure, and included primary (monoethanolamine), secondary (diethanolamine), tertiary (methyldiethanolamine), sterically hindered (2-amino-2-methyl-1-propanol) and cyclic amines (piperazine). The study was performed in a systematic manner, starting from the development of the models for the pure amines, the description of their thermophysical properties, and the properties of the aqueous mixtures. Compared to other models described in literature, the present modelling approach preserves the effects due the chemical structure and key intermolecular interactions of the examined alkanolamines/amines through a set of molecular parameters obtained from pure substance data, whenever available, or transferred from substances of different chemical families. This enabled the development of a consistent modelling framework which can provide reliable thermodynamic property predictions of both single and blended amine solutions over a broad range of temperatures (298–373 K) and compositions (0–50 wt% amine). The proposed approach is well-suited for implementation and extension to other alkanolamines and amines, making it a valuable tool for having reliable process simulations as well as for the screening and discovery of new amine systems, which will be required for the deployment of more economical acid gas removal processes.

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  • Pereira, Luís M.C. & Llovell, Fèlix & Vega, Lourdes F., 2018. "Thermodynamic characterisation of aqueous alkanolamine and amine solutions for acid gas processing by transferable molecular models," Applied Energy, Elsevier, vol. 222(C), pages 687-703.
    • Handle: RePEc:eee:appene:v:222:y:2018:i:c:p:687-703
    DOI: 10.1016/j.apenergy.2018.04.021
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    3. Jovell, Daniel & Gonzalez-Olmos, Rafael & Llovell, Fèlix, 2022. "A computational drop-in assessment of hydrofluoroethers in Organic Rankine Cycles," Energy, Elsevier, vol. 254(PB).

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