424065 Microfluidic Study of CO2 Solubility in Aqueous Single and Mixed-Electrolyte Solutions

Monday, November 9, 2015
Exhibit Hall 1 (Salt Palace Convention Center)
Samira Abedi, Chau-Chyun Chen and Siva A. Vanapalli, Chemical Engineering, Texas Tech University, Lubbock, TX

Comprehensive studies of phase equilibria of CO2 in various aqueous electrolyte solutions are important to many applications such as CO2 capture, storage and sequestration. Microfluidics (MF) can be a valuable tool for investigation of CO2 mass transfer and solubility in electrolyte solutions, due to its superior mass and heat transfer, well-defined gas–liquid interfacial areas and the ability to vary reagent concentrations in a high-throughput manner. Uniformly sized bubbles of CO2 were isothermally generated in co-flowing liquid streams with different compositions within a MF platform and the evolution of the bubble lengths were followed visually. The solubility of CO2 in the solutions was obtained from a comparison between the terminal and the initial plug sizes. Measurements of CO2 solubility in aqueous single electrolyte solutions (NaCl, Na2SO4, KCl, K2SO4, MgCl2, MgSO4 and CaCl2) and aqueous mixed-electrolyte solutions at 298.15 K were performed in a microfluidic platform. The results of this work provide essential data for the development of comprehensive thermodynamic models for CO2 solubility in geothermal brine solutions.

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