CO2 capture into aqueous solutions of piperazine activated 2-amino-2-methyl-1-propanol |
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Authors: | Peter Brú der,Andreas Grimstvedt,Thor Mejdell,Hallvard F. Svendsen |
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Affiliation: | aNorwegian University of Science and Technology (NTNU) Department of Chemical Engineering, Sem Sælands vei 4, Trondheim NO-7491, Norway;bSINTEF Materials and Chemistry, Sem Sælands vei 2A, Trondheim NO-7465, Norway |
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Abstract: | In this work, experimental data and a simplified vapor–liquid equilibrium (VLE) model for the absorption of CO2 into aqueous solutions of piperazine (PZ) activated 2-amino-2-methyl-1-propanol (AMP) are reported. The purpose of the work was to find the AMP/PZ system with the highest concentration and cyclic capacity, which could be used in the industry without forming solid precipitations at operational temperatures. The effect of the AMP/PZ ratio and the total concentration level of amine was studied. The highest possible ratio of AMP/PZ, which does not form solid precipitates during the absorption of CO2 at 40 °C (40 wt% amine), was identified. Considering the maximum loading found in the screening tests for AMP/PZ (3+1.5 M) and for 30 wt% MEA systems, the AMP/PZ system has about 128% higher specific cyclic capacity if operating between 40 and 80 °C, and almost twice the CO2 partial pressure at 120 °C compared to MEA. |
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Keywords: | Piperazine (PZ) 2-amino-2-methyl-1-propanol (AMP) Absorption Thermodynamics process Mathematical modeling Phase equilibria |
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