Experimental measurement and thermodynamic modelling of hydrate phase equilibrium conditions for krypton + n -butyl ammonium bromide aqueous solution

2016 ◽  
Vol 107 ◽  
pp. 676-681 ◽  
Author(s):  
Saeedeh Babaee ◽  
Hamed Hashemi ◽  
Amir H. Mohammadi ◽  
Paramespri Naidoo ◽  
Deresh Ramjugernath
Keyword(s):  
Aqueous Solution ◽  
Phase Equilibrium ◽  
Experimental Measurement ◽  
Thermodynamic Modelling ◽  
Ammonium Bromide ◽  
Equilibrium Conditions ◽  
Hydrate Phase

Measurement of Latent Heat of Tetra-n-Butyl Ammonium Bromide Hydrate and Specific Enthalpy of Its Slurry

2015 ◽  
Vol 23 (03) ◽  
pp. 1550025 ◽  
Author(s):  
Hiroyuki Kumano ◽  
Tatsunori Asaoka ◽  
Tatsuya Hayashi ◽  
Peng Zhang
Keyword(s):  
Aqueous Solution ◽  
Phase Equilibrium ◽  
Specific Heat ◽  
Latent Heat ◽  
Specific Enthalpy ◽  
Ammonium Bromide ◽  
Equilibrium Conditions ◽  
Hydrate Form ◽  
Latent Heats ◽  
Storage Characteristics

The specific heat of a tetra-n-butyl ammonium bromide (TBAB) aqueous solution, the latent heat of a TBAB hydrate, and the specific enthalpy of a TBAB hydrate slurry were measured to understand the thermal storage characteristics of TBAB hydrate slurry. A solution sample and the hydrate slurry were heated, the change in temperature was measured, and the specific heat of the TBAB aqueous solution and the specific enthalpy of the hydrate slurry were obtained from the change in temperature. Two types of TBAB hydrate form. Therefore, the hydrates were separated from the hydrate slurry formed from TBAB aqueous solution having several initial concentrations. The hydrate crystals were placed into solution, and the latent heats were obtained from the temperature change of the solution. The specific enthalpy of the hydrate slurry was estimated from the latent heats of the hydrate crystals and the specific heat of the solution under phase equilibrium conditions, and the measured and estimated values were compared.

scholarly journals A Graphical Alternating Conditional Expectation to Predict Hydrate Phase Equilibrium Conditions for Sweet and Sour Natural Gases

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Hai-Quan Zhong ◽  
Qi-Long Yao ◽  
Yu Wang ◽  
Yu-Fa He ◽  
Zi-Han Li
Keyword(s):  
Phase Equilibrium ◽  
Natural Gas ◽  
Hydrate Formation ◽  
Equilibrium Conditions ◽  
Natural Gases ◽  
Alternating Conditional Expectation ◽  
Hydrate Phase ◽  
Ace Model ◽  
Data Points ◽  
Formation Phase

Natural gas hydrate has been widely of concern due to its great potential in application to address problems including gas storage, transmission, separation techniques, and also as energy resource. Accurate prediction of hydrate formation phase equilibrium conditions is essential for the optimized design during natural gas production, processing, and transportation. In this study, a novel graphical alternating conditional expectation (ACE) algorithm was proposed to predict hydrate formation phase equilibrium conditions for sweet and sour natural gases. The accuracy and performance of the presented ACE model were evaluated using 1055 data points (688, 249, and 118 data points for sweet natural gas, CO2-CH4, and H2S-CO2-CH4 systems, respectively) collected from literature. Meanwhile, a comparative study was conducted between the ACE model and commonly used correlations, including thirteen models for sweet natural gases, three models for CO2-CH4 binary system, and seven thermodynamic models for H2S-CO2-CH4 ternary system. The obtained results indicated that the proposed ACE model produces the best results in prediction of hydrate phase equilibrium temperature for sweet natural gases and pressure for CO2-CH4 system with average absolute relative deviation (AARD) of 0.134% and 2.75%, respectively. The proposed quick and explicit ACE model also provides a better performance in prediction of hydrate phase equilibrium pressure for H2S-CO2-CH4 ternary systems with AARD=5.20% compared with seven thermodynamic methods considered in this work, except for CPA/Electrolyte/Chen–Guo combined model (AARD=4.45%).

Hydrate phase equilibrium measurements for (THF+SDS+CO2+N2) aqueous solution systems in porous media

2014 ◽  
Vol 370 ◽  
pp. 12-18 ◽  
Author(s):  
Yi Zhang ◽  
Mingjun Yang ◽  
Yongchen Song ◽  
Lanlan Jiang ◽  
Yanghui Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Porous Media ◽  
Phase Equilibrium ◽  
Hydrate Phase

Hydrate Phase Equilibrium of CH4-Rich Binary and Ternary Gas Mixtures in the Presence of Tetra-n-butyl Ammonium Bromide

2019 ◽  
Vol 64 (12) ◽  
pp. 5929-5934
Author(s):  
Shuanshi Fan ◽  
Shali You ◽  
Yanhong Wang ◽  
Xuemei Lang ◽  
Chi Yu ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Gas Mixtures ◽  
Ammonium Bromide ◽  
Hydrate Phase
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