Effect of seawater ions on cyclopentane-methane hydrate phase equilibrium

In present work, phase equilibrium of cyclopentane-methane hydrate formed in different salt solution systems was studied using an orthogonal test method. The target ions including four cations (K+, Na+, Mg2+, Ca2+) and two anions (Cl-, SO42-) were employed. The experimental results showed that the e...

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Bibliographic Details
Published in:Fluid Phase Equilibria
Main Authors: Lv, Qiunan, Zang, Xueru, Li, Xiaosen, Li, Gang
Format: Report
Language:English
Published: ELSEVIER SCIENCE BV 2018
Subjects:
Phase equilibrium
Cyclopentane-methane hydrate
Seawater ions
Orthogonal test method
BINARY CLATHRATE HYDRATE
GAS HYDRATE
ELECTROLYTE-SOLUTIONS
AQUEOUS-SOLUTIONS
DISSOCIATION ENTHALPIES
WATER DESALINATION
STABILITY
HYDROGEN
PREDICTION
SYSTEMS
Thermodynamics
Chemistry
Engineering
Physical
Chemical
Methane hydrate
Online Access:http://ir.giec.ac.cn/handle/344007/22886
http://ir.giec.ac.cn/handle/344007/22887
https://doi.org/10.1016/j.fluid.2017.11.031
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Summary:In present work, phase equilibrium of cyclopentane-methane hydrate formed in different salt solution systems was studied using an orthogonal test method. The target ions including four cations (K+, Na+, Mg2+, Ca2+) and two anions (Cl-, SO42-) were employed. The experimental results showed that the equilibrium temperature of cyclopentane - methane hydrate decreased when four cations (K+, Na+, Mg2+, Ca2+) and two anions (Cl-, SO42-) were added. The equilibrium temperature decreased with the increase of ion concentrations. Analysis of variance suggested that cations presented a sequential inhibition effect on hydrate formation as follows: Mg2+ > Ca2+ > Na+ > K+, while Cl- ion had a much stronger hydrate inhibition effect than SO42- ion. The hydrate inhibition strength of an ion depended on the charge and radii of ion. The inhibitory effects of ions became intensified with the charge increased and radius decreased. And the radius of ions played a more significant role than charge of ions in altering hydrate phase equilibrium. (C) 2017 Published by Elsevier B.V.

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