کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6588565 | 1423237 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
CO2 absorption rate in semi-aqueous monoethanolamine
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
Post-combustion CO2 capture using amine scrubbing is the most promising technology to reduce CO2 emissions from coal- or gas-fired power plants. Increasing CO2 absorption rate (kgâ²) reduces the absorber capital cost, which is the cost center of the capture plant. By partially replacing water with N-methyl-2-pyrrolidone (NMP) in 7â¯m (30â¯wt%) aqueous monoethanolamine (MEA), the CO2 absorption rate (kgâ²) is significantly enhanced because of lower CO2 loading/higher free MEA at the same CO2 partial pressure (PâCO2), greater CO2 physical solubility, and greater MEA activity. At 40â¯Â°C, in the operating range of 100-5000â¯Paâ¯PâCO2, the average kgâ² of 7â¯m MEA in 3 water/1 NMP, 1 water/3 NMP, and 1 water/19 NMP is 1.1 times, 2 times, and 5 times that of 7â¯m aqueous MEA, respectively. CO2 physical solubility, solvent viscosity, and MEA activity were measured. A kinetic model was built in MATLAB® to better understand the mass transfer of CO2 into semi-aqueous MEA (MEA-NMP-water). The model suggests that the diffusion and reaction of CO2 into aqueous MEA can be approximated by pseudo-first-order (PFO) behavior and adding NMP causes deviation from PFO by the depletion of MEA at the surface. The semi-aqueous solvent provides an excellent rate of CO2 absorption, but the increased viscosity reduces normalized capacity and the volatility of the physical solvent must be addressed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 182, 8 June 2018, Pages 56-66
Journal: Chemical Engineering Science - Volume 182, 8 June 2018, Pages 56-66
نویسندگان
Ye Yuan, Gary T. Rochelle,