Journal
JOURNAL OF CHEMICAL THERMODYNAMICS
Volume 104, Issue -, Pages 212-217Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2016.09.004
Keywords
Gas hydrate; Phase equilibrium; Ethylene glycol; Methanol; Formation water
Categories
Funding
- National Natural Science Foundation of China [51576069, 21506065]
- China Postdoctoral Science Foundation [2015M572321]
- Guangdong Natural Science Foundation [2016A030313488]
- Fundamental Research Funds for the Central University [2015ZZ076, 2015ZM121]
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In this paper, the three-phase coexistence points are generated for multicomponent gas hydrate in methanol (MeOH) solution for (0.05, 0.10, 0.15, and 0.35) mass fraction and ethylene glycol (EG) solution for (0.05, 0.10, 0.15, 0.35, 0.40 and 0.55) mass fraction. The phase equilibrium curves of different system were obtained by an isochoric pressure-search method on high pressure apparatus. The phase equilibrium regions of multicomponent gas hydrate were measured using the same composition of natural gas distributed in the South China Sea. And the different concentration solutions were prepared based formation water. The experimental data were measured in a wide range temperature from 267.74 to 298.53 K and a wide range pressure from 4.22 MPa to 34.72 MPa. The results showed that the hydrate phase equilibrium curves shifted to the inhibition region in accordance with the increased inhibitor concentration. In addition, the equilibrium temperature would decrease about 2.7 K when the concentration of MeOH increased 0.05 mass fraction. Besides, the suppression temperature was 1.25 K with the 0.05 mass fraction increase of EG concentration in the range of 0.05 mass fraction to 0.15 mass fraction. While in high EG concentration region, the suppression temperature was 3.3 K with the same increase of EG concentration (0.05 mass fraction). (C) 2016 Elsevier Ltd.
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