DOI: 10.1016/j.jcou.2019.01.002
Scopus记录号: 2-s2.0-85059864437
论文题名: CO 2 absorption performance enhancement by dodecane nanoemulsion absorbents
作者: Kim S. ; Xu R. ; Lee W. ; Choi C.K. ; Kang Y.T.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2019
卷: 30 起始页码: 18
结束页码: 27
语种: 英语
英文关键词: CO 2 absorption
; Dodecane
; Mass transfer enhancement
; Nanoemulsion absorbents
; Shuttle effect model
Scopus关键词: Carbon dioxide
; Chemical stability
; Dispersions
; Drops
; Image enhancement
; Mass transfer
; Methanol
; Temperature
; Turbidity
; CO2 absorption
; Dodecane
; Effect model
; Mass transfer enhancement
; Nanoemulsion
; Absorption
英文摘要: Among the CO 2 capture technologies, the physical absorption is one of the most common absorption methods. However, the physical absorption process is operated at extremely low temperature, and therefore huge freezing energy is required. The objective of this study is to develop the nanoemulsion absorbents that can be operated at room temperature. The nanoemulsion absorbents are prepared by the ultrasonication method. Based on the chemical properties, Span 60 and Tween 60 are added to maintain a good dispersion stability. CO 2 absorption experiments using a porous nozzle absorber are conducted for various dodecane concentration (0.005-0.5 vol%) and CO 2 flow rate (0.06-0.12 g/s). It is found that the CO 2 absorption performance of 0.05 vol% nanoemulsion absorbents is 10% higher than that of pure methanol. Through the single CO 2 bubble absorption visualization experiments, it is confirmed that the nanoemulsion absorbents cause faster bubble absorption than pure methanol does. The turbidity index (Nephelometry turbidity unit) of nanoemulsion absorbents is kept constant for seven days, which means a good dispersion stability. The enhancement mechanism of CO 2 absorption is explained based on the Einstein-Stokes' equation, cryogenic transmission electron images, and droplet size measurements. The key idea is that nano-sized dodecane (64 nm) absorbs the CO 2 molecules and transports it to the bulk region by the Brownian diffusion. A random walk model is used to investigate the droplet size prediction and CO 2 absorption performance enhancement. © 2019 Elsevier Ltd. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117302
Appears in Collections: 气候变化与战略
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Recommended Citation:
Kim S.,Xu R.,Lee W.,et al. CO 2 absorption performance enhancement by dodecane nanoemulsion absorbents[J]. Journal of CO2 Utilization,2019-01-01,30