Résumé -Prévision des zones de stabilité d'hydrates de gaz naturels par utilisation de réseaux de neurones artificiels -Une méthode par réseaux de neurones artificiels avec alimentation dans le sens direct faisant appel à 19 variables d'entrée (température, structure de l'hydrate, composition du gaz et concentration de l'inhibiteur en phase aqueuse) et 35 neurones dans une phase cachée unique, a été développée pour estimer les pressions de dissociation d'hydrates de gaz naturels en présence ou non d'inhibiteur en solution aqueuse. Le modèle a été développé en faisant appel à 3296 données de dissociation d'hydrates collectées dans la littérature. La fiabilité de la méthode a été vérifiée par utilisation de données expérimentales indépendantes (non utilisées pour l'apprentissage du réseau de neurones et le développement du modèle). On montre que les résultats de calculs (prédictions) sont en accord acceptable avec les valeurs expérimentales prouvant ainsi la capacité des réseaux de neurones pour l'estimation des zones de stabilité d'hydrates de gaz naturels.
Abstract -Predicting the Hydrate Stability Zones of Natural Gases Using Artificial Neural Networks
The effect of a tributylmethylphosphonium methylsulfate ionic liquid (IL) aqueous solution on the equilibrium conditions of carbon dioxide and methane clathrate hydrates was studied. An isochoric pressure-search method was used to measure the hydrate dissociation conditions for the carbon dioxide + tributylmethylphosphonium methylsulfate + water and methane + tributylmethylphosphonium methylsulfate + water systems in the temperature ranges of (273.5 to 282.2) K and (273.3 to 288.5) K, and pressures up to (4.35 and 14.77) MPa, respectively. The concentrations of tributylmethylphosphonium methylsulfate in the aqueous solutions were 0, 0.2611, and 0.5007 mass fractions. The good agreement between our experimental hydrate dissociation data in the absence of tributylmethylphosphonium methylsulfate with selected literature experimental data demonstrates the reliability of the experimental method used in this work. The comparison between the hydrate dissociation conditions in the presence and absence of tributylmethylphosphonium methylsulfate shows that the IL has an inhibition effect on carbon dioxide and methane clathrate hydrate formation. Furthermore, a thermodynamic model, developed based on van der Waals–Platteeuw solid solution theory accompanied with the Peng–Robinson equation of state (PR-EoS) and the nonrandom two-liquid (NRTL) activity model, was successfully applied to represent/predict the obtained experimental data.
Abstract. Withdrawing of representative and reliable microsamples down to 1/100th mg is far from trivial, especially for extreme conditions such as high temperature and high pressure conditions or very corrosive media. The new Rapid On-Line SamplerInjector presented herein was designed and set-up to largely extend sampling capabilities in hazardous media. It is largely used in our laboratory to measure vapour-liquid equilibria. It has a lot of applications, both in production (process control in petroleum, chemical, nuclear plants, etc.) and academic and industrial researches and development (laboratory instruments, pilot plants…).
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