The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
Arash Kamranpirzaman - One of the best experts on this subject based on the ideXlab platform.
-
Thermodynamic modeling of the dissociation conditions of hydrogen sulfide clathrate hydrate in the presence of aqueous solution of Inhibitor alcohol salt or ethylene glycol
Chemical Engineering Research & Design, 2014Co-Authors: Abolfazl Mohammadi, Mehrdad Manteghian, Amir H Mohammadi, Arash KamranpirzamanAbstract:Abstract Hydrate dissociation conditions of hydrogen sulfide in the presence of aqueous solution of Thermodynamic Inhibitor (methanol, ethanol, ethylene glycol, NaCl, KCl and CaCl 2 ) is modeled in this communication. A Thermodynamic model is developed to correlate the hydrate dissociation conditions for the systems of H 2 S + water + salt (single and mixed salts of NaCl, KCl and CaCl 2 ), H 2 S + water + alcohol (methanol or ethanol), H 2 S + water + ethylene glycol and H 2 S + water + mixed salt, and methanol/ethylene glycol. Extended-UNIQUAC (e-UNIQUAC) approach is used for modeling of the activity coefficient of water in aqueous phase. The structural parameters of e-UNIQUAC model are extracted from literature but interaction parameters of this model are obtained by fitting the model with experimental data. The results of the present model are in satisfactory agreement with experimental data.
-
Thermodynamic modeling of the dissociation conditions of hydrogen sulfide clathrate hydrate in the presence of aqueous solution of Inhibitor alcohol salt or ethylene glycol
Chemical Engineering Research & Design, 2014Co-Authors: Abolfazl Mohammadi, Mehrdad Manteghian, Amir H Mohammadi, Arash KamranpirzamanAbstract:Abstract Hydrate dissociation conditions of hydrogen sulfide in the presence of aqueous solution of Thermodynamic Inhibitor (methanol, ethanol, ethylene glycol, NaCl, KCl and CaCl 2 ) is modeled in this communication. A Thermodynamic model is developed to correlate the hydrate dissociation conditions for the systems of H 2 S + water + salt (single and mixed salts of NaCl, KCl and CaCl 2 ), H 2 S + water + alcohol (methanol or ethanol), H 2 S + water + ethylene glycol and H 2 S + water + mixed salt, and methanol/ethylene glycol. Extended-UNIQUAC (e-UNIQUAC) approach is used for modeling of the activity coefficient of water in aqueous phase. The structural parameters of e-UNIQUAC model are extracted from literature but interaction parameters of this model are obtained by fitting the model with experimental data. The results of the present model are in satisfactory agreement with experimental data.
Yu Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Effect of Fulvic Acid and Sodium Chloride on the Phase Equilibrium of Methane Hydrate in Mixed Sand-Clay Sediment
'American Chemical Society (ACS)', 2019Co-Authors: Lv Tao, Li Xiaosen, Yu Zhang, Chen Zhaoyang, Xu Chungang, Cai JingAbstract:The phase equilibrium conditions for methane hydrate in mixed sand-clay sediment with the presence of fulvic acid (FA) and sodium chloride (NaCl) were measured using the multistep heating method. The experiments were conducted at the temperatures from 281.45 to 290.65 K and pressures from 6.33 to 17.39 MPa, respectively. The mixed sand-clay porous media and aqueous solutions containing 2.0, 6.0, and 10.0 wt % FA and 3.0 wt % NaCl were used. The experimental results indicate that the phase equilibrium curve of methane hydrate in mixed porous media shifts to the left side as compared to that in bulk solutions because of the capillary force and hydrophilic surfaces of porous media. FA is a Thermodynamic Inhibitor for methane hydrate formation as the -COO- and short alkyl substituent of FA could compete with hydrate for water molecules, and the inhibition effect of FA on methane hydrate formation is weaker as compared to 3.0 wt % NaCl under all studied concentration conditions. The phase equilibrium pressures of methane hydrate in mixed porous media with the presence of 2.0 wt % FA + 3.0 wt % NaCl,6.0 wt % FA + 3.0 wt % NaCl, 10.0 wt % FA + 3.0 wt % NaCl are all higher than that with only 3.0 wt % NaCl present, and the pressure increases with the increase in FA concentration. The existence of FA solutions and FA + NaCl solutions in mixed porous media does not affect the methane hydrate structure
-
Effect of Fulvic Acid and Sodium Chloride on the Phase Equilibrium of Methane Hydrate in Mixed Sand–Clay Sediment
Journal of Chemical & Engineering Data, 2019Co-Authors: Zhao-yang Chen, Yu Zhang, Jing CaiAbstract:The phase equilibrium conditions for methane hydrate in mixed sand–clay sediment with the presence of fulvic acid (FA) and sodium chloride (NaCl) were measured using the multistep heating method. The experiments were conducted at the temperatures from 281.45 to 290.65 K and pressures from 6.33 to 17.39 MPa, respectively. The mixed sand–clay porous media and aqueous solutions containing 2.0, 6.0, and 10.0 wt % FA and 3.0 wt % NaCl were used. The experimental results indicate that the phase equilibrium curve of methane hydrate in mixed porous media shifts to the left side as compared to that in bulk solutions because of the capillary force and hydrophilic surfaces of porous media. FA is a Thermodynamic Inhibitor for methane hydrate formation as the −COO– and short alkyl substituent of FA could compete with hydrate for water molecules, and the inhibition effect of FA on methane hydrate formation is weaker as compared to 3.0 wt % NaCl under all studied concentration conditions. The phase equilibrium pressures...
-
Effect of Fulvic Acid and Sodium Chloride on the Phase Equilibrium of Methane Hydrate in Mixed Sand–Clay Sediment
2019Co-Authors: Zhao-yang Chen, Yu Zhang, Jing CaiAbstract:The phase equilibrium conditions for methane hydrate in mixed sand–clay sediment with the presence of fulvic acid (FA) and sodium chloride (NaCl) were measured using the multistep heating method. The experiments were conducted at the temperatures from 281.45 to 290.65 K and pressures from 6.33 to 17.39 MPa, respectively. The mixed sand–clay porous media and aqueous solutions containing 2.0, 6.0, and 10.0 wt % FA and 3.0 wt % NaCl were used. The experimental results indicate that the phase equilibrium curve of methane hydrate in mixed porous media shifts to the left side as compared to that in bulk solutions because of the capillary force and hydrophilic surfaces of porous media. FA is a Thermodynamic Inhibitor for methane hydrate formation as the −COO– and short alkyl substituent of FA could compete with hydrate for water molecules, and the inhibition effect of FA on methane hydrate formation is weaker as compared to 3.0 wt % NaCl under all studied concentration conditions. The phase equilibrium pressures of methane hydrate in mixed porous media with the presence of 2.0 wt % FA + 3.0 wt % NaCl, 6.0 wt % FA + 3.0 wt % NaCl, 10.0 wt % FA + 3.0 wt % NaCl are all higher than that with only 3.0 wt % NaCl present, and the pressure increases with the increase in FA concentration. The existence of FA solutions and FA + NaCl solutions in mixed porous media does not affect the methane hydrate structure
-
Experimental Investigation into the Production Behavior of Methane Hydrate under Methanol Injection in Quartz Sand
Energy & Fuels, 2017Co-Authors: Yu Zhang, Yi WangAbstract:In this work, the dissociation behavior of methane hydrate in quartz sand sediment by injecting a Thermodynamic Inhibitor, methanol (MeOH), was investigated using a one-dimensional experimental apparatus. The experimental results indicated that the hydrate dissociation process included four stages: free gas production, methanol dilution, major hydrate dissociation, and residual gas production. The overall liquid production rate was smaller than the injection rate during the whole production process. The cumulative gas produced from hydrate under methanol solution injection was adjusted with the reference experiment. A new strategy of the adjustment of the experimental runs was introduced, which was based on the ratio of the water and methanol solution injection rates. In general, with the increase of the methanol injection rate and the methanol concentration, the cumulative hydrate-originating gas produced increased. During the major hydrate dissociation stage, the production efficiency was enhanced conti...
Jing Cai - One of the best experts on this subject based on the ideXlab platform.
-
Effect of Fulvic Acid and Sodium Chloride on the Phase Equilibrium of Methane Hydrate in Mixed Sand–Clay Sediment
Journal of Chemical & Engineering Data, 2019Co-Authors: Zhao-yang Chen, Yu Zhang, Jing CaiAbstract:The phase equilibrium conditions for methane hydrate in mixed sand–clay sediment with the presence of fulvic acid (FA) and sodium chloride (NaCl) were measured using the multistep heating method. The experiments were conducted at the temperatures from 281.45 to 290.65 K and pressures from 6.33 to 17.39 MPa, respectively. The mixed sand–clay porous media and aqueous solutions containing 2.0, 6.0, and 10.0 wt % FA and 3.0 wt % NaCl were used. The experimental results indicate that the phase equilibrium curve of methane hydrate in mixed porous media shifts to the left side as compared to that in bulk solutions because of the capillary force and hydrophilic surfaces of porous media. FA is a Thermodynamic Inhibitor for methane hydrate formation as the −COO– and short alkyl substituent of FA could compete with hydrate for water molecules, and the inhibition effect of FA on methane hydrate formation is weaker as compared to 3.0 wt % NaCl under all studied concentration conditions. The phase equilibrium pressures...
-
Effect of Fulvic Acid and Sodium Chloride on the Phase Equilibrium of Methane Hydrate in Mixed Sand–Clay Sediment
2019Co-Authors: Zhao-yang Chen, Yu Zhang, Jing CaiAbstract:The phase equilibrium conditions for methane hydrate in mixed sand–clay sediment with the presence of fulvic acid (FA) and sodium chloride (NaCl) were measured using the multistep heating method. The experiments were conducted at the temperatures from 281.45 to 290.65 K and pressures from 6.33 to 17.39 MPa, respectively. The mixed sand–clay porous media and aqueous solutions containing 2.0, 6.0, and 10.0 wt % FA and 3.0 wt % NaCl were used. The experimental results indicate that the phase equilibrium curve of methane hydrate in mixed porous media shifts to the left side as compared to that in bulk solutions because of the capillary force and hydrophilic surfaces of porous media. FA is a Thermodynamic Inhibitor for methane hydrate formation as the −COO– and short alkyl substituent of FA could compete with hydrate for water molecules, and the inhibition effect of FA on methane hydrate formation is weaker as compared to 3.0 wt % NaCl under all studied concentration conditions. The phase equilibrium pressures of methane hydrate in mixed porous media with the presence of 2.0 wt % FA + 3.0 wt % NaCl, 6.0 wt % FA + 3.0 wt % NaCl, 10.0 wt % FA + 3.0 wt % NaCl are all higher than that with only 3.0 wt % NaCl present, and the pressure increases with the increase in FA concentration. The existence of FA solutions and FA + NaCl solutions in mixed porous media does not affect the methane hydrate structure
Abolfazl Mohammadi - One of the best experts on this subject based on the ideXlab platform.
-
Thermodynamic modeling of the dissociation conditions of hydrogen sulfide clathrate hydrate in the presence of aqueous solution of Inhibitor alcohol salt or ethylene glycol
Chemical Engineering Research & Design, 2014Co-Authors: Abolfazl Mohammadi, Mehrdad Manteghian, Amir H Mohammadi, Arash KamranpirzamanAbstract:Abstract Hydrate dissociation conditions of hydrogen sulfide in the presence of aqueous solution of Thermodynamic Inhibitor (methanol, ethanol, ethylene glycol, NaCl, KCl and CaCl 2 ) is modeled in this communication. A Thermodynamic model is developed to correlate the hydrate dissociation conditions for the systems of H 2 S + water + salt (single and mixed salts of NaCl, KCl and CaCl 2 ), H 2 S + water + alcohol (methanol or ethanol), H 2 S + water + ethylene glycol and H 2 S + water + mixed salt, and methanol/ethylene glycol. Extended-UNIQUAC (e-UNIQUAC) approach is used for modeling of the activity coefficient of water in aqueous phase. The structural parameters of e-UNIQUAC model are extracted from literature but interaction parameters of this model are obtained by fitting the model with experimental data. The results of the present model are in satisfactory agreement with experimental data.
-
Thermodynamic modeling of the dissociation conditions of hydrogen sulfide clathrate hydrate in the presence of aqueous solution of Inhibitor alcohol salt or ethylene glycol
Chemical Engineering Research & Design, 2014Co-Authors: Abolfazl Mohammadi, Mehrdad Manteghian, Amir H Mohammadi, Arash KamranpirzamanAbstract:Abstract Hydrate dissociation conditions of hydrogen sulfide in the presence of aqueous solution of Thermodynamic Inhibitor (methanol, ethanol, ethylene glycol, NaCl, KCl and CaCl 2 ) is modeled in this communication. A Thermodynamic model is developed to correlate the hydrate dissociation conditions for the systems of H 2 S + water + salt (single and mixed salts of NaCl, KCl and CaCl 2 ), H 2 S + water + alcohol (methanol or ethanol), H 2 S + water + ethylene glycol and H 2 S + water + mixed salt, and methanol/ethylene glycol. Extended-UNIQUAC (e-UNIQUAC) approach is used for modeling of the activity coefficient of water in aqueous phase. The structural parameters of e-UNIQUAC model are extracted from literature but interaction parameters of this model are obtained by fitting the model with experimental data. The results of the present model are in satisfactory agreement with experimental data.
Bahman Tohidi - One of the best experts on this subject based on the ideXlab platform.
-
experimental and dft approach on the determination of natural gas hydrate equilibrium with the use of excess n2 and choline chloride ionic liquid as an Inhibitor
Energy & Fuels, 2016Co-Authors: Mohammad Tariq, Majeda Khraisheh, Mert Atilhan, Enas Othman, Marcelo Castier, Gregorio Garcia, Santiago Aparicio, Bahman TohidiAbstract:This work presents the characterization of hydrate-forming conditions of a Qatari natural gas-type mixture, QNG-S1, obtained using two different experimental methods, namely, a benchtop reactor and a gas hydrate autoclave. The obtained experimental results were found to be in agreement with each other. Another mixture in which the QNG-S1 sample was diluted with nitrogen (N2) in a 1:1 ratio was also characterized for hydrate dissociation conditions using a rocking cell apparatus only. The Thermodynamic hydrate inhibition effect of a biocompatible ionic liquid, choline chloride (ChCl), was tested for both QNG-S1 and QNG-S1+N2 at two concentrations (1 and 5 wt %) using the rocking cell apparatus. It was found that the ChCl shows a typical classical Thermodynamic Inhibitor behavior for both tested mixtures QNG-S1 and QNG-S1+N2 by shifting the hydrate equilibrium toward lower temperature and higher pressure. Likewise, the interaction between ChCl and model hydrate cages was analyzed using density functional th...
-
Experimental determination and prediction of methane hydrate stability in alcohols and electrolyte solutions
Fluid Phase Equilibria, 2009Co-Authors: Hesam Najibi, Antonin Chapoy, Hooman Haghighi, Bahman TohidiAbstract:Abstract In petroleum exploration and production operations, gas hydrates pose serious flow assurance, economic and safety concerns. Thermodynamic Inhibitors are widely used to reduce the risks associated with gas hydrate formation. In this communication, in order to establish the effects of salts and Thermodynamic Inhibitors on the locus of incipient hydrate–liquid water–vapour (H–L W –V) curve, we report new experimental dissociation data for various quaternary systems, methane/water/Thermodynamic Inhibitor/salts for a pressure range of 6.89–29 MPa. The investigated systems include alcohols such as methanol and ethylene glycol and common salts such as sodium chloride, potassium chloride and calcium chloride. The freezing points of all the aqueous solutions were also measured to check the validity of a previously developed correlation for the prediction of hydrate equilibrium conditions in the presence of salts and alcohols. A Thermodynamic approach in which the well-proven Valderrama modification of the Patel–Teja (VPT) equation of state combined with a modified Debye–Huckel electrostatic term was employed to model the phase equilibria. The hydrate-forming conditions are modelled by the solid solution theory of Van der Waals and Platteeuw. The Langmuir constants have been calculated using the Kihara potential model. The results show that the agreement for both model and correlation are very good.