Browsing by Author "Zeinali, Fatemeh"

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    Screening of polyamine solvents for co2 capture: Solubility measurement and modeling
    (Faculty of Graduate Studies and Research, University of Regina, 2024-11) Zeinali, Fatemeh; Henni, Amr; Ibrahim, Hussameldin; Peng, Wei
    This research aims to identify new promising amines suitable for industrial-scale CO2 capture from natural and flue gas streams. Ideal amines should exhibit high CO2 solubility and low regeneration energy requirements. The amines selected for this study feature multiple amino groups, including combinations of secondary and tertiary amino groups within their molecular structures. The solubilities of two amines in CO2 were examined in this work: 1-[Bis[3-(dimethyl-amino) propyl]amino]2-propanol (BDMAPAP) and N, N, N', N', N''-Pentamethyl diethylene-triamine (PMDETA). The pressure decay method was used to measure and determine the solubilities. To fully assess the performance of these amines under varied circumstances, experiments were carried out at two temperatures (313.15K and 333.15K) with 10 wt.% and 30 wt.% concentrations and within a range of CO2 partial pressures. Both amines' CO2 uptake findings were compared to those of other amine solutions under comparable circumstances, such as piperazine (PZ), 1-ethylpiperazine (1-EPZ), 1-(2-Hydroxy-ethyl)piperazine (HEP), and 1,4-Bis(3-aminopropyl)piperazine. The results showed that compared to these other amines, there was a greater uptake of CO2. N, N, N', N'-tetramethyl-trimethylenediamine (TMTMDA), N, N-dimethyl-1,3-propane-diamine (DMPDA), N, N-dimethyl-dipropylene triamine (DMDPTA), 3,3'-Diamino-N-methyl-dipropylamine (DAMDPA), and 3,3'-Iminobis(N, N-dimethylpropylamine) (IBDMPA) were also compared to see how these amines were absorbed at 313.15 K. Except IBDMPA; the results revealed noticeably greater CO2 uptakes for the amines under comparable circumstances. Notably, the CO2 uptakes were substantially higher than benchmark amines commonly used in the industry, such as piperazine (PZ) and monoethanolamine (MEA). The superior performance of these amines indicates a high potential for more efficient CO2 capture processes. The model employed is the electrolyte Non-Random Two-Liquids (eNRTL) in conjunction with the Redlich-Kwong equation of state for the gas phase. PMDETA's average absolute deviation (AAD%) between the experimental data and the estimated values was 0.1%, 0.01%, and 0.008% for mole fractions, temperatures, and pressures, respectively. Similarly, for (BDMAPAP), the %AAD between the eNRTL model's estimated values and experimental data amounted to 0.15%, 0.03%, and 0.30% for mole fractions, pressures, and temperatures, respectively. The GLE model facilitated the calculation of the molar heat of absorption using the Gibbs-Helmholtz equation. The examined amines exhibited lower molar heat than other amines, such as PZ, MEA, and DMAPA, offering critical insights into their thermal efficiency and energy requirements during regeneration. The molar absorption heat at infinite dilution of CO2 was approximately -43 kJ·mol⁻¹ for both amine solutions, which is significantly lower than that of other amines, including PZ and MEA. In conclusion, the high CO2 solubility and favorable thermodynamic properties of BDMAPAP and PMDETA highlight their promise as efficient CO2 capture agents. These findings suggest that the selected amines could significantly enhance industrial CO2 capture processes, offering a potential pathway to more sustainable and cost-effective solutions for mitigating CO2 emissions.