Calculation for Solubility of Methane and Carbon Dioxide in Water in Presence of Hydrate
- Zunzhao Li (SINOPEC Dalian Research Inst. of Petroleum and Petrochemicals) | Xiaolin Wang (SINOPEC Dalian Research Inst. of Petroleum and Petrochemicals) | Qian Xue (SINOPEC Dalian Research Inst. of Petroleum and Petrochemicals) | Mingrui Liu (SINOPEC Dalian Research Inst. of Petroleum and Petrochemicals)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- methane, hydrate, carbon dioxide, solubility, model
- 1 in the last 30 days
- 32 since 2007
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A new model was proposed to evaluate the effect of pressure and temperature on the solubility of CO2 and CH4 using the P-T equation of state, the van der Waals-Platteeuw model and the Holder model. The calculated results indicate that the pressure has a significant effect on the solubility values. The dissolution mechanism of CH4 and CO2 in solution in the presence of hydrate is proposed. Based on the two assumptions the model is improved and has good accuracy in calculating the solubility of CH4 and CO2 in solution in the presence of hydrate.
Gas hydrate storage of greenhouse gas CO2 and CO2 displacement methods to develop natural gas hydrates have proven to be effective methods to mitigate greenhouse gas CO2 emissions and to develop natural gas hydrates (Goel, 2006). However, the diffusion and dissolution of CH4 and CO2 in the seawater surrounding the hydrate and its variation are related to the stability of the seafloor hydrate and the changes of the marine environment. Therefore, the study on the solubility of CH4 and CO2 in aqueous phase in the presence of hydrate phase is of great significance to the development of gas hydrate and the storage of CO2 in the ocean.
The determination of gas solubility generally used the following steps, first, high-pressure hydrate generation, and then release the solution containing no hydrate particles. Finally, the solution was measured after flashing vapor phase volume and liquid mass to calculate the solubility of CH4 and CO2 (Yang, Yang, Kim and Lee, 2000; Servio and Englezos, 2001; Satoshi, Shigeru, Chen, Song and Masahiro, 2005). Zhang et al. (Zhang, Holder and Robert, 2008) measured the formation of hydrate in a single aqueous phase consisting of CO2-H2O. The results show that the solubility of CH4 and CO2 in pure water decreased with the decrease of temperature in the presence of hydrate. The effect of pressure on the solubility of CO2 in hydrate is indefinite. Yang et al. (Yang, Yang, Kim and Lee, 2000) pointed out that the solubility of CO2 at 7C° decreases with the increase of pressure. Satoshi et al. (Satoshi, Shigeru, Chen, Song and Masahiro, 2005) and Sun et al. (Sun, Tian, Li, Guo, Liu and Yang, 2016) found that the solubility of CO2 in solution in the presence of hydrate increased with increasing pressure. Geng et al. (Geng, Qu, Lu, Jiang and Chou, 2017) found that CO2 concentration in equilibrium with hydrate decreases slightly with increasing pressure (from 50 to 900 bar at 276.15, 280.15, and 285.15 K.) using in situ Raman spectroscopic method.
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