Selection of Mixed Amines in the CO<sub>2</sub> Capture Process
In order to select the best mixed amines in the CO<sub>2</sub> capture process, the absorption of CO<sub>2</sub> in mixed amines was explored at the required concentrations by using monoethanolamine (<i>MEA</i>) as a basic solvent, mixed with diisopropanolamine (D...
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MDPI AG
2021-02-01
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| author | Pao-Chi Chen Hsun-Huang Cho Jyun-Hong Jhuang Cheng-Hao Ku |
| author_facet | Pao-Chi Chen Hsun-Huang Cho Jyun-Hong Jhuang Cheng-Hao Ku |
| author_sort | Pao-Chi Chen |
| collection | DOAJ |
| description | In order to select the best mixed amines in the CO<sub>2</sub> capture process, the absorption of CO<sub>2</sub> in mixed amines was explored at the required concentrations by using monoethanolamine (<i>MEA</i>) as a basic solvent, mixed with diisopropanolamine (DIPA), triethanolamine (TEA), 2-amino-2-methyl-1-propanol (<i>AMP</i>), and piperazine (<i>PZ</i>). Here, a bubble column was used as the scrubber, and a continuous operation was adopted. The Taguchi method was used for the experimental design. The conditional factors included the type of mixed amine (A), the ratio of the mixed amines (B), the liquid feed flow (C), the gas-flow rate (D), and the concentration of mixed amines (E). There were four levels, respectively, and a total of 16 experiments. The absorption efficiency (<i>E<sub>F</sub></i>), absorption rate (<i>R<sub>A</sub></i>), overall mass transfer coefficient (<i>K<sub>G</sub>a</i>), and scrubbing factor (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ϕ</mi></semantics></math></inline-formula>) were used as indicators and were determined in a steady-state by the mass balance and two-film models. According to the Taguchi analysis, the importance of the parameters and the optimum conditions were obtained. In terms of the absorption efficiency (<i>E<sub>F</sub></i>), the absorption rate (absorption factor) (<i>R<sub>A</sub></i>/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ϕ</mi></semantics></math></inline-formula>), and the overall mass transfer coefficient (<i>K<sub>G</sub>a</i>), the order of importance is D > E > A > B > C, D > E > C > B > A, and D > E > C > A > B, respectively, and the optimum conditions are A1B4C4D3E3, A1B3C4D4E2, A4B2C3D4E4, and A1B1C1D4E1. The optimum condition validation results showed that the optimal values of <i>E<sub>F</sub></i>, <i>R<sub>A</sub></i>, and <i>K<sub>G</sub>a</i> are 100%, 30.69 × 10<sup>−4</sup> mol/s·L, 1.540 l/s, and 0.269, respectively. With regard to the selection of mixed amine, it was found that the mixed amine (<i>MEA</i> + <i>AMP</i>) performed the best in the CO<sub>2</sub> capture process. |
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| spelling | doaj.art-d1a52aacd8444a629ce05163d4e6db862023-12-11T18:13:21ZengMDPI AGC2311-56292021-02-01712510.3390/c7010025Selection of Mixed Amines in the CO<sub>2</sub> Capture ProcessPao-Chi Chen0Hsun-Huang Cho1Jyun-Hong Jhuang2Cheng-Hao Ku3Department of Chemical and Materials Engineering, Lunghwa University of Science and Technology, Taoyuan 33306, TaiwanDepartment of Chemical and Materials Engineering, Lunghwa University of Science and Technology, Taoyuan 33306, TaiwanDepartment of Chemical and Materials Engineering, Lunghwa University of Science and Technology, Taoyuan 33306, TaiwanDepartment of Chemical and Materials Engineering, Lunghwa University of Science and Technology, Taoyuan 33306, TaiwanIn order to select the best mixed amines in the CO<sub>2</sub> capture process, the absorption of CO<sub>2</sub> in mixed amines was explored at the required concentrations by using monoethanolamine (<i>MEA</i>) as a basic solvent, mixed with diisopropanolamine (DIPA), triethanolamine (TEA), 2-amino-2-methyl-1-propanol (<i>AMP</i>), and piperazine (<i>PZ</i>). Here, a bubble column was used as the scrubber, and a continuous operation was adopted. The Taguchi method was used for the experimental design. The conditional factors included the type of mixed amine (A), the ratio of the mixed amines (B), the liquid feed flow (C), the gas-flow rate (D), and the concentration of mixed amines (E). There were four levels, respectively, and a total of 16 experiments. The absorption efficiency (<i>E<sub>F</sub></i>), absorption rate (<i>R<sub>A</sub></i>), overall mass transfer coefficient (<i>K<sub>G</sub>a</i>), and scrubbing factor (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ϕ</mi></semantics></math></inline-formula>) were used as indicators and were determined in a steady-state by the mass balance and two-film models. According to the Taguchi analysis, the importance of the parameters and the optimum conditions were obtained. In terms of the absorption efficiency (<i>E<sub>F</sub></i>), the absorption rate (absorption factor) (<i>R<sub>A</sub></i>/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ϕ</mi></semantics></math></inline-formula>), and the overall mass transfer coefficient (<i>K<sub>G</sub>a</i>), the order of importance is D > E > A > B > C, D > E > C > B > A, and D > E > C > A > B, respectively, and the optimum conditions are A1B4C4D3E3, A1B3C4D4E2, A4B2C3D4E4, and A1B1C1D4E1. The optimum condition validation results showed that the optimal values of <i>E<sub>F</sub></i>, <i>R<sub>A</sub></i>, and <i>K<sub>G</sub>a</i> are 100%, 30.69 × 10<sup>−4</sup> mol/s·L, 1.540 l/s, and 0.269, respectively. With regard to the selection of mixed amine, it was found that the mixed amine (<i>MEA</i> + <i>AMP</i>) performed the best in the CO<sub>2</sub> capture process.https://www.mdpi.com/2311-5629/7/1/25aminebubble-column scrubberTaguchi methodoverall mass transfer coefficient |
| spellingShingle | Pao-Chi Chen Hsun-Huang Cho Jyun-Hong Jhuang Cheng-Hao Ku Selection of Mixed Amines in the CO<sub>2</sub> Capture Process C amine bubble-column scrubber Taguchi method overall mass transfer coefficient |
| title | Selection of Mixed Amines in the CO<sub>2</sub> Capture Process |
| title_full | Selection of Mixed Amines in the CO<sub>2</sub> Capture Process |
| title_fullStr | Selection of Mixed Amines in the CO<sub>2</sub> Capture Process |
| title_full_unstemmed | Selection of Mixed Amines in the CO<sub>2</sub> Capture Process |
| title_short | Selection of Mixed Amines in the CO<sub>2</sub> Capture Process |
| title_sort | selection of mixed amines in the co sub 2 sub capture process |
| topic | amine bubble-column scrubber Taguchi method overall mass transfer coefficient |
| url | https://www.mdpi.com/2311-5629/7/1/25 |
| work_keys_str_mv | AT paochichen selectionofmixedaminesinthecosub2subcaptureprocess AT hsunhuangcho selectionofmixedaminesinthecosub2subcaptureprocess AT jyunhongjhuang selectionofmixedaminesinthecosub2subcaptureprocess AT chenghaoku selectionofmixedaminesinthecosub2subcaptureprocess |