scholarly journals Thermodynamic Equilibrium Conditions for Simulated Landfill Gas Hydrate Formation in Aqueous Solutions of Additives

2012 ◽  
Vol 57 (11) ◽  
pp. 3290-3295 ◽  
Author(s):  
Zhi-Ming Xia ◽  
Zhao-Yang Chen ◽  
Xiao-Sen Li ◽  
Yu Zhang ◽  
Ke-Feng Yan ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Thermodynamic Equilibrium ◽  
Gas Hydrate ◽  
Landfill Gas ◽  
Hydrate Formation ◽  
Equilibrium Conditions ◽  
Gas Hydrate Formation ◽  
Simulated Landfill

A Method To Predict Equilibrium Conditions of Gas Hydrate Formation in Porous Media

1999 ◽  
Vol 38 (6) ◽  
pp. 2485-2490 ◽  
Author(s):  
Matthew A. Clarke ◽  
Mehran Pooladi-Darvish ◽  
P. Raj Bishnoi
Keyword(s):  
Porous Media ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Equilibrium Conditions ◽  
Gas Hydrate Formation

scholarly journals Insights into kinetic inhibition effects of MEG, PVP, and L-tyrosine aqueous solutions on natural gas hydrate formation

2020 ◽  
Author(s):  
Amir Saberi ◽  
Abdolmohammad Alamdari ◽  
Ali Rasoolzadeh ◽  
Amir H. Mohammadi
Keyword(s):  
Natural Gas ◽  
Aqueous Solutions ◽  
Gas Hydrate ◽  
Induction Time ◽  
Hydrate Formation ◽  
View Point ◽  
Natural Gas Hydrate ◽  
Time Data ◽  
Gas Hydrate Formation ◽  
Gas Consumption

Abstract It is necessary to understand all the prerequisites, which result in gas hydrate formation for safe design and control of a variety of processes in petroleum industry. Thermodynamic hydrate inhibitors (THIs) are normally used to preclude gas hydrate formation by shifting hydrate stability region to lower temperatures and higher pressures. Sometimes, it is difficult to avoid hydrate formation and hydrates will form anyway. In this situation, kinetic hydrate inhibitors (KHIs) can be used to postpone formation of gas hydrates by retarding hydrate nucleation and growth rate. In this study, two kinetic parameters including natural gas hydrate formation induction time and the rate of gas consumption were experimentally investigated in the presence of monoethylene glycol (MEG), L-tyrosine, and polyvinylpyrrolidone (PVP) at various concentrations in aqueous solutions. Since hydrate formation is a stochastic phenomenon, the repeatability of each kinetic parameter was evaluated several times and the average values for the hydrate formation induction times and the rates of gas consumption are reported. The results indicate that from the view point of hydrate formation induction time, 2 wt% PVP and 20 wt% MEG aqueous solutions have the highest values and are the best choices. It is also interpreted from the results that from the view point of the rate of gas consumption, 20 wt% MEG aqueous solution yields the lowest value and is the best choice. Finally, it is concluded that the combination of PVP and MEG in an aqueous solution has a simultaneous synergistic impact on natural gas hydrate formation induction time and the rate of gas consumption. Furthermore, a semi-empirical model based on chemical kinetic theory is applied to evaluate the hydrate formation induction time data. A good agreement between the experimental and calculated hydrate formation induction time data is observed.

Thermodynamic Modelling of Gas Hydrate Formation in the Presence of Inhibitors and the Consideration of their Effect

2014 ◽  
Vol 14 (1) ◽  
pp. 45
Author(s):  
Peyman Sabzi ◽  
Saheb Noroozi
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Low Temperatures ◽  
Hydrate Formation ◽  
Transportation Systems ◽  
Flow Lines ◽  
Main Approach ◽  
Efficient Inhibitor ◽  
System A ◽  
Gas Hydrate Formation

Gas hydrates formation is considered as one the greatest obstacles in gas transportation systems. Problems related to gas hydrate formation is more severe when dealing with transportation at low temperatures of deep water. In order to avoid formation of Gas hydrates, different inhibitors are used. Methanol is one of the most common and economically efficient inhibitor. Adding methanol to the flow lines, changes the thermodynamic equilibrium situation of the system. In order to predict these changes in thermodynamic behavior of the system, a series of modelings are performed using Matlab software in this paper. The main approach in this modeling is on the basis of Van der Waals and Plateau's thermodynamic approach. The obtained results of a system containing water, Methane and Methanol showed that hydrate formation pressure increases due to the increase of inhibitor amount in constant temperature and this increase is more in higher temperatures. Furthermore, these results were in harmony with the available empirical data.Keywords: Gas hydrates, thermodynamic inhibitor, modelling, pipeline blockage

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