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Determination of Dew Point Conditions for CO2 with Impurities Using Microfluidics.
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- Author(s): Wen Song1; Fadaei, Hossem1; Sinton, David1
- Source:
Environmental Science & Technology. 3/18/2014, Vol. 48 Issue 6, p3567-3574. 8p.- Subject Terms:
- Source:
- Additional Information
- Abstract: Impurities can greatly modify the phase behavior of carbon dioxide (CO2), with significant implications on the safety and cost of transport in pipelines. In this paper we demonstrate a microfluidic approach to measure the dew point of such mixtures, specifically the point at which water in supercritical CO2 mixtures condenses to a liquid state. The method enables direct visualization of dew formation (∼ 1-2 μm diameter droplets) at industrially relevant concentrations, pressures, and temperatures. Dew point measurements for the well-studied case of pure CO2-water agreed well with previous theoretical and experimental data over the range of pressure (up to 13.17 MPa), temperature (up to 50 °C), and water content (down to 0.00229 mol fraction) studied. The microfluidic approach showed a nearly 3-fold reduction in error as compared to previous methods. When applied to a mixture with nitrogen (2.5%) and oxygen (5.8%) impurities-typical of flue gas from natural gas oxy-fuel combustion processes-the measured dew point pressure increased on average 1735 ± 5.4%, indicating a more stringent minimum pressure for pipeline transport In addition to increased precision, the microfluidic method offers a direct measurement of dew formation, requires very small volumes (∼10 μL), and is applicable to ultralow water contents (<0.005 mol fractions), circumventing the limits of previous methods. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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