Prediction of hydrate formation conditions in the solutions containing electrolyte and alcohol inhibitors and their mixtures using UNIQUAC-NRF models

Moradi, Sara; Haghtalab, Ali; Fazlali, Alireza

doi:10.1016/j.fluid.2013.03.031

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…The usual methods for preventing gas hydrates formation are classified as one of the following methods or a combination of these methods: (1) the injection of inhibitor to the system, (2) dehydrating the flow of gas, and (3) maintaining temperature and pressure conditions of gas pipeline in a zone which is outside the hydrate stability zone through insulation or heating the pipeline. It should be noted that among these methods the inhibitor injection is used as the most practical method in the oil industry.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria of Carbon Dioxide Hydrates in the Presence of Methanol/Ethylene Glycol and KCl Aqueous Solutions

2017

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In this study, the experimental data for dissociation conditions of carbon dioxide hydrates in the presence of 0.05 and 0.1 mass fraction KCl solution + 0.1 and 0.2 mass fraction methanol and ethylene glycol were measured and then reported at different temperatures and pressure ranges not available in the related literature. The phase equilibrium curves were drawn using an isochoric pressure-search method. To validate the used apparatus and the experimental findings of the current study and also to show the inhibition effects of the aqueous solutions used in this study, the experimental values were compared with some selected experimental data from the literature about the dissociation conditions of carbon dioxide hydrates in the presence of pure water and aqueous solution with 0.05 mass fraction KCl. Finally, to examine the inhibitory effect of various inhibitors and their synergies on each other, the suppressed temperature for hydrate formation was evaluated in the presence of different inhibitor solutions. This value showed that the rate of suppressed temperature for hydrate formation for each solution has been almost constant in various pressures. The synergy effect of KCl with methanol or glycol at low concentrations is negligible indicating that these two inhibitors have no impact on each other. It was also shown that, by increasing the concentration of the inhibitors, this rule was violated, the inhibitors were affected by each other, and the amount of inhibition effect increases. This synergy is of utmost importance for oil and gas pipelines and also for the industrial equipment that naturally contain some salt, in which alcohol or glycol will be added to prevent hydrate formation.

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Section: Introductionmentioning

confidence: 99%

Phase Equilibria of Carbon Dioxide Hydrates in the Presence of Methanol/Ethylene Glycol and KCl Aqueous Solutions

2017

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“…Up to now, although thermodynamic models were used successfully for either salts or alcohols containing solutions, they were inaccurate for mixtures of alcohols and salts. One of the ways to computing the water activity coefficient is g-f approach; in the simplest method, the water activity coefficient is calculated by summing the contributions from gases, electrolytes and alcohol so that interactions of gas-electrolyte, gas-alcohol, and electrolytealcohol are neglected [10][11][12][13][14]. In these studies, the water activity coefficient in the aqueous electrolyte systems is generally calculated by summing electrostatic and short-range interaction terms.…”

Section: Introductionmentioning

confidence: 99%

“…Javanmardi et al [13] applied the Margules equation along with a Debye-Hückel type model. Moradi et al [14] applied the UNIQUAC-NRF model along with the Pitzer-DebyeHückel model. In these works [10][11][12][13][14], it was assumed that no interaction is taking placed between electrolyte and alcohol.…”

Section: Introductionmentioning

confidence: 99%

“…Moradi et al [14] applied the UNIQUAC-NRF model along with the Pitzer-DebyeHückel model. In these works [10][11][12][13][14], it was assumed that no interaction is taking placed between electrolyte and alcohol. Jager et al [15] showed that the influence of the mixed inhibitors on hydrate formation is greater than the sum of single inhibitors effects.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamic modeling of gas hydrate formation conditions in the presence of organic inhibitors, salts and their mixtures using UNIQUAC model

Delavar

Haghtalab

2015

Fluid Phase Equilibria

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“…In different system, many factors can be used to control crystal nucleus growth process, such as diffusion, heat transfer, stirring rate, reaction kinetics, and heat exchange rate on surface of crystal [8][9][10]. In view of the above factors, many researchers propose the crystallization kinetics model which describes the nucleation based on mass transfer theory, crystallization theory, and two-film gasliquid mass transfer theory [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Modeling Studies on the Prediction of Gas Hydrate Formation

Zhang

Liu

Tan

et al. 2015

Journal of Chemistry

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On the base of some kinetics model analysis and kinetic observation of hydrate formation process, a new prediction model of gas hydrate formation is proposed. The analysis of the present model shows that the formation of gas hydrate not only relevant with gas composition and free water content but also relevant with temperature and pressure. Through contrast experiment, the predicted result of the new prediction method of gas hydrate crystallization kinetics is close to measured result, it means that the prediction method can reflect the hydrate crystallization accurately.

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Prediction of hydrate formation conditions in the solutions containing electrolyte and alcohol inhibitors and their mixtures using UNIQUAC-NRF models

Cited by 8 publications

References 18 publications

Phase Equilibria of Carbon Dioxide Hydrates in the Presence of Methanol/Ethylene Glycol and KCl Aqueous Solutions

Phase Equilibria of Carbon Dioxide Hydrates in the Presence of Methanol/Ethylene Glycol and KCl Aqueous Solutions

Thermodynamic modeling of gas hydrate formation conditions in the presence of organic inhibitors, salts and their mixtures using UNIQUAC model

Experimental and Modeling Studies on the Prediction of Gas Hydrate Formation

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