Measuring Nitrous Oxide Mass Transfer into Non-Aqueous CO2BOL CO2 Capture Solvents

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• 作者：Greg A. Whyatt ; Charles J. Freeman ; Andy Zwoster ; David J. Heldebrant
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：April 27, 2016
• 年：2016
• 卷：55
• 期：16
• 页码：4720-4725
• 全文大小：297K
• 年卷期：0
• ISSN：1520-5045

文摘

This paper investigates CO₂ absorption behavior in CO₂BOL solvents by decoupling the physical and chemical effects using N₂O as a nonreactive mimic. Absorption measurements were performed using a wetted-wall contactor. Testing was performed using a “first generation” CO₂-binding organic liquid (CO₂BOL), composed of an independent base and alcohol. Measurements were made with N₂O at a lean (0.06 mol CO₂/mol BOL) and rich (0.26 mol CO₂/mol BOL) loading, each at three temperatures (35, 45, and 55 °C). Liquid-film mass transfer coefficients (kg′) were calculated by subtracting the gas film resistance-determined from a correlation from literature–from the overall mass transfer measurement. The resulting kg′ values for N₂O in CO₂BOLs were found to be higher than that of 5 M aqueous MEA under comparable conditions, which is supported by published measurements of Henry’s coefficients for N₂O in various solvents. These results suggest that the physical solubility contribution for CO₂ absorption in CO₂BOLs is greater than that of aqueous amines, an effect that may pertain to other nonaqueous solvents.