Effects of C3H8 on hydrate formation and dissociation for integrated CO2 capture and desalination technology

Mingjun Yang, Jianan Zheng, Weiguo Liu, Yu Liu and Yongchen Song

Energy, 2015, vol. 93, issue P2, 1971-1979

Abstract: Hydrate-based technology has been developing for decades to meet the demands in industrial applications. With the global demands for reduced carbon dioxide (CO2) emissions and more fresh water, CHBD (CO2hydrate-based desalination) was proposed and has developed rapidly. In this study, to provide basic data for the improvement of CHBD, the thermodynamic and kinetic characteristics of CO2and propane (C3H8) mixed-gas hydrates in salt solution were experimentally investigated in which C3H8was chosen as the hydrate formation promoter. We studied nine experimental cases (54 cycles) with different C3H8proportions (ranging from 0 to 13%) and different initial solution saturations (30%, 40% and 50%). The hydrate phase equilibrium data were generated using the isochoric method, and the hydrate formation saturations were calculated using the relative gas uptake equation. The results indicated that the increase in the C3H8proportion significantly decreases the gas mixture hydrate equilibrium pressure. Additionally, the relative gas uptake was reduced as the C3H8proportion increased. A lower relative gas uptake was obtained at a lower gas pressure for the same gas mixture. The initial solution saturation exhibited an insignificant effect on the hydrate phase equilibrium conditions. When the initial solution saturations increased from 30% to 50%, the relative gas uptake decreased.

Keywords: CO2 capture; Hydrate-based technology; Desalination; Thermodynamic; Kinetic (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (15)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:93:y:2015:i:p2:p:1971-1979

DOI: 10.1016/j.energy.2015.10.076

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