Kinetic and Thermodynamic Analysis of High-Pressure CO2 Capture Using Ethylenediamine: Experimental Study and Modeling
| Autor: | Alfredo Viloria, Alex Palma-Cando, Josselyne A. Villarroel, Marvin Ricaurte |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
CO2 capture
Technology Control and Optimization Materials science Diffusion Energy Engineering and Power Technology Ethylenediamine chemistry.chemical_compound Acid gas Electrical and Electronic Engineering Solubility Engineering (miscellaneous) high-pressure system Aqueous solution Renewable Energy Sustainability and the Environment ethylenediamine kinetics thermodynamic analysis modeling Solvent chemistry Chemical engineering Amine gas treating Absorption (chemistry) Energy (miscellaneous) |
| Zdroj: | Energies, Vol 14, Iss 6822, p 6822 (2021) Energies; Volume 14; Issue 20; Pages: 6822 |
| ISSN: | 1996-1073 |
| Popis: | One of the alternatives to reduce CO2 emissions from industrial sources (mainly the oil and gas industry) is CO2 capture. Absorption with chemical solvents (alkanolamines in aqueous solutions) is the most widely used conventional technology for CO2 capture. Despite the competitive advantages of chemical solvents, the technological challenge in improving the absorption process is to apply alternative solvents, reducing energy demand and increasing the CO2 captured per unit of solvent mass. This work presents an experimental study related to the kinetic and thermodynamic analysis of high-pressure CO2 capture using ethylenediamine (EDA) as a chemical solvent. EDA has two amine groups that can increase the CO2 capture capacity per unit of solvent. A non-stirred experimental setup was installed and commissioned for CO2 capture testing. Tests of the solubility of CO2 in water were carried out to validate the experimental setup. CO2 capture testing was accomplished using EDA in aqueous solutions (0, 5, 10, and 20 wt.% in amine). Finally, a kinetic model involving two steps was proposed, including a rapid absorption step and a slow diffusion step. EDA accelerated the CO2 capture performance. Sudden temperature increases were observed during the initial minutes. The CO2 capture was triggered after the absorption of a minimal amount of CO2 (~10 mmol) into the liquid solutions, and could correspond to the “lean amine acid gas loading” in a typical sweetening process using alkanolamines. At equilibrium, there was a linear relationship between the CO2 loading and the EDA concentration. The CO2 capture behavior obtained adapts accurately (AAD < 1%) to the kinetic mechanism. |
| Databáze: | OpenAIRE |
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