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Статті в журналах з теми "Azote – Solubilité":
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Ghazouani, Hiba, Chokri Hafsi, Roua Amami, Farooq Sher, Dorsaf Slimani, Basma Marai, and Zaineb Arfaoui. "Evaluation of the effect of nitrogen nutrition on the water productivity of some varieties of durum wheat." JOURNAL OF OASIS AGRICULTURE AND SUSTAINABLE DEVELOPMENT 4, Special (June 16, 2022): 200–206. http://dx.doi.org/10.56027/joasd.spiss262022.
Анотація:
Durum wheat needs energy to accomplish the main metabolic and physiological functions; this energy is provided mainly by nitrogen which is also a fundamental constituent of the plant. Despite its importance and because of its high solubility, nitrogen is classified as a potential pollutant for the environment. The objective of this work is to study the response of four varieties of durum wheat (Karim, Razzak, INRAT100 and Dhahbi) to nitrogen treatment. The results showed that the new variety (Dhahbi) gave highest yield and water use efficiency either with or without fertilization thanks to the impact of genetic improvement. Thus, it is recommended to plant the Dhahbi variety to limit the use of nitrogen fertilizers, protect the environment and maximize gross income, especially for small farmers.
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Rani, Nidhi, Praveen Kumar та Randhir Singh. "Molecular Modeling Studies of Halogenated Imidazoles against 14α- Demethylase from Candida Albicans for Treating Fungal Infections". Infectious Disorders - Drug Targets 20, № 2 (13 травня 2020): 208–22. http://dx.doi.org/10.2174/1871526519666181130101054.
Анотація:
Background:Imidazole is one of the most explored and marketed azole utilized for the treatment of fungal infections. Lanosterol 14α-demethylase (Cytochrome P450DM) is the active target site for azole antifungals.Aim and Objective:This study emphasized on evaluation of a series of halogenated imidazole analogues using molecular docking studies for anti-Candidal activity. Furthermore, the model was refined by molecular dynamic simulation.Methods:Halogenated imidazole analogues (PS1-PS30) were obtained from literature for the study. The imidazole analogues were prepared using Chem sketch and molecular docking was performed using Molergo Virtual Docker program and ADMET study was carried out by using Accelry’s Accord for Excel programme.Results:The docking study indicated that all the imidazole analogues (PS1-PS30) and standard drugs i.e., Ketoconazole, Miconazole and Clotrimazole possessed interaction with protein residue, heme cofactor and water molecule positioned above Heme cofactor of 14α-demethylase. Further, the ADMET study indicated that most of the halogenated imidazoles possessed good absorption, human intestinal absorption, aqueous solubility and blood brain penetration.Conclusion:Halogenated imidazole analogues may be used as potential lead molecules as 14α- demethylase inhibitors.
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Kostina, M. V., L. G. Rigina, V. S. Kostina, A. E. Kudryashov, and R. S. Fedortsov. "Raschetnaya otsenka rastvorimosti azota i fazovogo sostava v stali na osnove Fe-13% Cr pri ee dopolnitel'nom legirovanii (Mn, Mo, V, Nb)." Микология и фитопатология, no. 2 (December 15, 2023): 64–77. http://dx.doi.org/10.31857/s086957332302009x.
Анотація:
Estimates of the nitrogen solubility in model steels of various compositions based on Fe-13%Cr with additional alloying (a small amount from hundredths of a percent to 1.5%) with elements (Mn, Mo, V, Nb) that increase the solubility of nitrogen in iron-based solid solutions are calculated. 60 variants of compositions were studied. Based on previously obtained own experimental data for nitrogen-containing steels with a content of 16%Cr-5%Ni-Nb for martensitic steel, a preliminary assessment of the composition stability coefficient of nitrogen used in the calculations of its (nitrogen) solubility was carried out. The resulting value of the composition stability coefficient is lower than for austenitic steels. For steels of all composition variants with calculated nitrogen content and different content of additional alloying elements (Mn, Mo, V, Nb), the phase composition was estimated using a modified Scheffler—Delong diagram and a nonequilibrium Potak—Sagalevich diagram for steel, which processed on solid solution. It is shown, among other things, that all compositions of Fe-13%Cr-Mn, Mo, V, Nb with a low carbon content (0.03—0.05%) with the maximum calculated solubility of nitrogen in the metal are in the martensitic-ferritic region. By calculation, the temperature of the martensitic transformation beginning was obtained using the empirical Finkler—Schirra formula and a correlation was established between the temperature of the martensitic transformation beginning and the Niequivalent/Crequivalent ratio (chromium and nickel equivalents calculated using formulas for the modified Scheffler—Delong diagram).
4
Olagboye, S. A., and G. F. Hassan. "Synthesis, Characterization and Biocidal Evaluation of Azole-Based Ligandsmetal Complexes." International Journal of Applied Sciences and Biotechnology 1, no. 4 (December 21, 2013): 258–65. http://dx.doi.org/10.3126/ijasbt.v1i4.9176.
Анотація:
Different metal complexes of the azole-based ligands have been synthesized and characterized based on the solubility, percentage yield, melting points and conductivity a well as the antimicrobial evaluations on the selected fungi species of plant pathogens. The studies revealed that solid metal complexes were soluble in 80% water and 20% (DMSO) dimethylsulphuroxide and the percentage yields were of appreciable high while the conductivity results showed that metal complexes were non-electrolytes. The solid complexes were also screened against the fungi species: Rhizoctonia solani,Pythium aphaindermatum,Rhizoctonia cerealis,Sclerotium rofisil ,Phyphotoria palmivora (causative agent of black pod diseases) and Benlate a commercial anti fungi agent (as control).The results of the present studies confirmed that metal complexes had good inhibitory actions on the growth of the fungi species and metal complexes appeared to be more proactive on the tested organisms than the free ligands.DOI: http://dx.doi.org/10.3126/ijasbt.v1i4.9176 Int J Appl Sci Biotechnol, Vol. 1(4): 258-265
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Ham, Young Yoon, James S. Lewis, and George R. Thompson. "Rezafungin: a novel antifungal for the treatment of invasive candidiasis." Future Microbiology 16, no. 1 (January 2021): 27–36. http://dx.doi.org/10.2217/fmb-2020-0217.
Анотація:
Rezafungin is a novel echinocandin with exceptional stability and solubility and a uniquely long half-life allowing for front-loaded drug exposure with once-weekly dosing. Rezafungin has been shown comparable to other echinocandins, with activity against Candida spp. and Aspergillus spp. including subsets of echinocandin-resistant Candida auris and azole-resistant Aspergillus isolates. Available clinical data show robust safety and promising efficacy. Phase III trials will provide data on efficacy of rezafungin for the treatment of candidemia and invasive candidiasis and for the prevention of invasive fungal disease in blood and bone marrow transplant recipients. Rezafungin is a promising new candidate in the antifungal arsenal that opens up clinical possibilities based on its impressive half-life, such as early hospital discharge for stable patients and use as prophylaxis in immunocompromised patients.
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Akishina, E. A., and Е. А. Dikusar. "Chemical modification of different compounds with nitrogen-containing heterocycles." Proceedings of the National Academy of Sciences of Belarus, Chemical Series 57, no. 3 (September 5, 2021): 356–84. http://dx.doi.org/10.29235/1561-8331-2021-57-3-356-384.
Анотація:
Heterocyclic compounds have an extremely important practical application, since many heterocycles are the basis of the most valuable medicinal substances, both natural (vitamins, enzymes, alkaloids, etc.) and synthetic biologically active compounds. The work mainly considers the most relevant directions for various purposes drugs search by modifying known bioactive natural, organoelement and framework compounds with 1,2-azole, oxazole, oxadiazole, thiazole, triazole, pyridine, pyrimidine heterocycles over the past 10 years. Chemical modification makes it possible to increase the water solubility of the compounds, which is important when choosing the pathways for the most rational drug introduction into the body, to reduce the toxicity of the corresponding substances, to increase the breadth of the therapeutic action, and also to give new valuable medicinal properties, thus significantly expanding their application in medicine and agriculture.
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Nagpal, Manju, Nisha Raj, Gurjeet Singh Thakur, and Geeta Aggarwal. "Improved Solubility of Itraconazole Binary Dispersions using Neem Gum: Development and Characterization of Topical Gel." Current Bioactive Compounds 15, no. 4 (July 4, 2019): 399–407. http://dx.doi.org/10.2174/1573407214666180926120619.
Анотація:
Background: Itraconazole is a triazole derivative and possesses structural similarities to the azole group (imidazoles and triazoles). It is a broad spectrum fungistatic. It belongs to BCS class II category i.e. it has poor solubility and high permeability. Objective: Dissolution enhancement of poorly soluble itraconazole using purified neem gum as a natural carrier via binary dispersions and other methods was studied. Topical gel formulations of binary dispersions were developed and evaluated for in vitro and in vivo antifungal activity. Methods: Five batches of solid dispersions (SD1-SD5) in various ratios of drug: neem gum were prepared by the solvent evaporation technique. Other mixtures were also prepared by kneading, cogrinding, physical mixing methods and evaluated further. Topical gel formulations were further developed and evaluated for antifungal activity (both in vitro and in vivo). Results: Equilibrium solubility studies of various mixtures indicated SD3 (1:3) as the optimum batch out of all solid dispersion batches. Equilibrium solubility studies of mixtures (KM, CGM, PM, SM) indicated significant solubility enhancement of kneading mixture in comparison to other mixtures. FTIR studies indicated no interaction of the drug to the polymer. DSC, SEM and XRD studies indicated a transition from crystalline to the amorphous state of the drug. SD3 batch showed remarkably improved dissolution characteristics (100% drug release in 1.5 h) in comparison to the pure drug (38% in 2h). Further, the topical gel of SD3 was evaluated for in vitro diffusion, in vitro and in vivo antifungal activity. Sustained drug release (53% in 24 h) was observed in SD3 based gel formulation which is significantly higher than that in comparison to pure drug based gel (30% in 24 h). The increased area of zone of inhibition of SD3 based gel indicated better antifungal activity of the SD3 gel formulation. Further histopathology examination of skin specimens indicated enhanced efficacy of SD3 based gel in comparison to pure drug based gel. Conclusion: Solid dispersion based topical gel formulation exhibits better antifungal activity in comparison to pure drug based gel.
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Jamiu, A. T., J. Albertyn, O. M. Sebolai, and C. H. Pohl. "Update on Candida krusei, a potential multidrug-resistant pathogen." Medical Mycology 59, no. 1 (May 13, 2020): 14–30. http://dx.doi.org/10.1093/mmy/myaa031.
Анотація:
Abstract Although Candida albicans remains the main cause of candidiasis, in recent years a significant number of infections has been attributed to non-albicans Candida (NAC) species, including Candida krusei. This epidemiological change can be partly explained by the increased resistance of NAC species to antifungal drugs. C. krusei is a diploid, dimorphic ascomycetous yeast that inhabits the mucosal membrane of healthy individuals. However, this yeast can cause life-threatening infections in immunocompromised patients, with hematologic malignancy patients and those using prolonged azole prophylaxis being at higher risk. Fungal infections are usually treated with five major classes of antifungal agents which include azoles, echinocandins, polyenes, allylamines, and nucleoside analogues. Fluconazole, an azole, is the most commonly used antifungal drug due to its low host toxicity, high water solubility, and high bioavailability. However, C. krusei possesses intrinsic resistance to this drug while also rapidly developing acquired resistance to other antifungal drugs. The mechanisms of antifungal resistance of this yeast involve the alteration and overexpression of drug target, reduction in intracellular drug concentration and development of a bypass pathway. Antifungal resistance menace coupled with the paucity of the antifungal arsenal as well as challenges involved in antifungal drug development, partly due to the eukaryotic nature of both fungi and humans, have left researchers to exploit alternative therapies. Here we briefly review our current knowledge of the biology, pathophysiology and epidemiology of a potential multidrug-resistant fungal pathogen, C. krusei, while also discussing the mechanisms of drug resistance of Candida species and alternative therapeutic approaches.
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Holubowitch, Nicolas. "Predicting Redox Potentials of Flow Battery-Relevant Model Electrolytes." ECS Meeting Abstracts MA2023-02, no. 4 (December 22, 2023): 699. http://dx.doi.org/10.1149/ma2023-024699mtgabs.
Анотація:
Redox flow batteries (RFBs) are rapidly gaining traction among large-scale storage solutions for intermittent renewable energy. Given the anticipated global scale of this technology, there is an intensive ongoing search for active electrolyte species containing all earth-abundant elements. Potential RFB actives must satisfy several criteria to maximize battery performance, namely, high solubility in the RFB solvent, optimum reduction potential, and chemical stability in all redox states. Given the near infinite possible molecular combinations of the primary atoms C, H, N, O, S, and Fe, computational chemistry is an invaluable tool to accelerate the discovery of promising new RFB active compounds. Towards that end, we performed DFT calculations on two major systems: iron(III/II) tris-2,2’-bipyridine, [Fe(bpy)3]3+/2+, as a model organometallic species, and azoles as a class of small, aromatic organic compounds. For [Fe(bpy)3]3+/2+, after extensive benchmarking of various functionals, basis sets, and other parameters, we accurately predict this complex’s one-electron reduction potential. The computational protocols employed on this system serve to open up the entire class or organometallics to predictive DFT calculations for future high-throughput screening. We also performed frequency calculations in the construction of a potential energy surface of [Fe(bpy)3]3+/2+’s degradation products, with consideration of all possible spin states, during this species’ hydrolysis-initiated dimerization to µ-O-[Fe(III)(bpy)2(H2O)]2 4+. The PES is discussed in light of literature-reported mechanisms for this system. Our study on functionalized azole compounds is motivated by recent demonstrations of azo compounds for RFBs in both aqueous and non-aqueous configurations. The azo group and its related nitro to amino group-containing monomeric species offers a plethora of potentially reversible redox transformations. Here, we investigate the redox potential and solvation energies of six azole-based compounds via DFT. Amino/nitro-functionalized azoles are small, aromatic compounds with the possibility to store up to six electrons per core, which would afford unprecedented energy densities in RFBs. The findings identify several species along the nitro-azo-amino pathway that have favorable redox potentials as anolyte or catholyte species (Fig. 1), as well as potentially high water solubility. Such coupling of anolyte-catholyte species from the same class of compounds would afford a crossover-proof RFB configuration analogous to vanadium systems that has not been demonstrated for aqueous organic flow batteries. Moreover, redox potentials between cis and trans isomers of the azo species were quantified, implicating further utility of these compounds in photo-mediated cells. These results will guide experimental investigations into the feasibility of implementing azole compounds for RFBs. Figure 1. Calculated redox potentials (Latimer diagram) for various azoles, including monomeric (nitro-nitroso-hydroxylamine-amino) and dimeric (azo-type) electron transfer events. Species falling outside the -0.5 to 0.5 V range (dotted lines) implicate their potential viability as RFB anolyte (V<-0.5) or catholyte (V>0.5) redox couples. Potentials were derived from DFT-level frequency calculations (free energies) utilizing the TPSS functional, def2-TZVPP basis set, and implicit solvation (CPCM H2O, vacuum- and solvent-optimized geometries). Figure 1
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Calvo, Natalia L., Sruthi Sreekumar, Laura A. Svetaz, María C. Lamas, Bruno M. Moerschbacher, and Darío Leonardi. "Design and Characterization of Chitosan Nanoformulations for the Delivery of Antifungal Agents." International Journal of Molecular Sciences 20, no. 15 (July 27, 2019): 3686. http://dx.doi.org/10.3390/ijms20153686.
Анотація:
Among different Candida species triggering vaginal candidiasis, Candida albicans is the most predominant yeast. It is commonly treated using azole drugs such as Tioconazole (TIO) and Econazole (ECO). However, their low water solubility may affect their therapeutic efficiency. Therefore, the aim of this research was to produce a novel chitosan nanocapsule based delivery system comprising of TIO or ECO and to study their suitability in vaginal application. These systems were characterized by their physicochemical properties, encapsulation efficiency, in vitro release, storage stability, cytotoxicity, and in vitro biological activity. Both nanocapsules loaded with TIO (average hydrodynamic size of 146.8 ± 0.8 nm, zeta potential of +24.7 ± 1.1 mV) or ECO (average hydrodynamic size of 127.1 ± 1.5 nm, zeta potential of +33.0 ± 1.0 mV) showed excellent association efficiency (99% for TIO and 87% for ECO). The analysis of size, polydispersity index, and zeta potential of the systems at 4, 25, and 37 °C (over a period of two months) showed the stability of the systems. Finally, the developed nanosystems presented fungicidal activity against C. albicans at non-toxic concentrations (studied on model human skin cells). The results obtained from this study are the first step in the development of a pharmaceutical dosage form suitable for the treatment of vaginal candidiasis.
Дисертації з теми "Azote – Solubilité":
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Boulliung, Julien. "Solubilité, spéciation et diffusion de l'azote dans les verres et silicates fondus." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0254.
Анотація:
L'azote (N) fait parti des éléments volatils (comme l'hydrogène et le carbone) essentiels à la vie sur Terre. Le comportement de cet élément lors des processus géologiques à haute température comme par exemple durant les processus magmatiques reste aujourd'hui très parcellaire. Cette thèse est centrée sur la solubilité, la spéciation et la diffusion de N dans les verres et silicates fondus dans le but de mieux comprendre comment cet élément se comporte lors de ces processus. La solubilité de N dans les silicates fondus a été étudiée pour différentes compositions et pour une large gamme de fO₂ (IW –8 à IW +4.1) à 1425°C et 1 atm. Les résultats montrent un effet majeur de la fO₂ et du degré de polymérisation des silicates fondus sur la solubilité de N. Ces nouvelles données suggèrent qu'un océan magmatique mafique à ultra-mafique aurait pu incorporer autant voir plus de N que ce qui est présent dans la Terre silicatée actuelle, supposant qu'une partie de N se soit échappée vers l'atmosphère ou que celle-ci est stockée dans la Terre profonde (i.e., manteau profond, noyau). Pour l'étude de la diffusion de N dans les verres et liquides silicatés, un développement expérimental et analytique a été nécessaire. Le premier coefficient de diffusion de N (sous la forme N³⁻) dans les silicates fondus, à partir de diffusion uni-axiale, a été mis en évidence pour un liquide de type basalte à andésite (i.e., 4.2 × 10⁻⁸ cm².s⁻¹). Cette étude a aussi permis de mettre en évidence l'effet de la composition du liquide sur la vitesse de diffusion de N³⁻ dans les silicates fondus. Cette dépendance à la composition des silicates fondus est plus importante pour N³⁻ que pour l'argon (Ar). Cela implique que le rapport N/Ar peut alors être fractionné lors de processus magmatiques en conditions réductrices (e.g., durant l'océan magmatique terrestre)Nitrogen (N) belongs to the volatile elements (like hydrogen and carbon) that are essential for life on Earth. The behavior of N during high temperature geological processes, such as during magmatic processes, remains poorly understood. This study focuses on N solubility, speciation, and diffusion in silicate glasses and melts to better understand the N behavior during these processes. N solubility in silicate melts was studied for different melt compositions and for a wide range of fO₂ (IW –8 to IW +4.1) at 1425°C and 1 atm. The data obtained highlight the fundamental control of fO₂ and the degree of polymerization of the silicate melt on N solubility. These new data suggest that a mafic to ultra-mafic magma ocean could have incorporated a similar or higher amount of N compared to the actual bulk silicate Earth, suggesting that N may have been to the atmosphere and/or stored in Earth's deep interior (i.e., deep mantle, core). For the study of N diffusion in silicate glasses and melts, experimental and analytical developments were necessary. The first diffusion coefficient of N (as N³⁻) in silicate melts was determined from uni-axial diffusion experiments in a basaltic andesitic melt (4.2 × 10⁻⁸ cm².s⁻¹). The data highlight that N³⁻ diffusivity depends on melt composition. This dependence on the melt composition is more important than that of argon (Ar). Furthermore, N³⁻ diffusion is significantly slower than that of Ar in similar silicate melts, implying that N/Ar ratios can be fractionated during reducing magmatic processes (e.g., during Earth's magma ocean stage)
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De, Stefani Vania. "Etude de la solubilité de solides à pression modérée, liée au domaine de la cryogénie : mesures et modélisation." Paris, ENMP, 2003. http://www.theses.fr/2003ENMP1125.
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Humbert, Franck. "Solubilité de l'azote dans les silicates liquides influence de la fugacité d'oxygène et de la composition." Nancy 1, 1998. http://www.theses.fr/1998NAN10250.
Анотація:
L’azote est un élément de première importance en géochimie du fait de son abondance atmosphérique. Pour mieux comprendre l'origine et l'évolution de l'atmosphère, il est nécessaire de quantifier les échanges entre la matière extraterrestre, le manteau terrestre et les réservoirs de surface. Ceci suppose la connaissance du comportement de l'azote dans les liquides silicates. Pour ceci, nous avons mis au point une technique expérimentale permettant d'équilibrer un liquide silicate à 1425°C en contact avec une atmosphère contrôlée en O2 et N2 (Ptot = 1atm), sur une très large gamme de fo2 (de IW + 8,7 à IW - 9,4) représentant les différentes conditions d'oxydoréduction qui ont régné de la nébuleuse solaire à celle de l'atmosphère actuelle. De plus, la nébuleuse solaire étant constituée majoritairement de H2, nous avons simule différentes atmosphères représentant les systèmes C-N et C-N-H. Du fait de la difficulté à analyser N2 en très faible concentration, nous avons développé une nouvelle méthode d'analyse de N2 en trace dans les silicates. Cette technique est basée sur la fusion par laser CO2 de l'échantillon, suivie d'une purification des gaz extraits et de l'analyse par spectrométrie de masse à vide statique. Cette étude a mis en évidence que la solubilité de l'azote est dépendante : i) de la fo2, avec la présence de mécanismes de solubilité physique et/ou chimique, ii) du système de gaz utilise (C-N ou C-N-H), avec des espèces azotées incorporées différentes et iii) de la composition du liquide silicate, lie à son degré de polymérisation. Sur la base de ces résultats, nous avons modélisé l'effet de la PN2 et de la composition du liquide silicate sur la solubilité de l'azote.
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Hilic, Sacha. "Mise au point d'une technique couplée, détecteur à fil vibrant et méthode pVT, pour la mesure simultanée du gonflement d'un polymère lors de l'absorption d'un fluide supercritique et de la solubilité du fluide dans le polymère." Clermont-Ferrand 2, 2000. http://www.theses.fr/2000CLF2A001.
Анотація:
Un nouvel instrument a été construit pour la mesure simultanée, de la solubilité des fluides dans les polymères, et du changement volumique associé à la sorption du fluide. La combinaison de deux techniques pVT et le détecteur à fil vibrant, est nécessaire pour isoler les deux grandeurs physico-chimiques à mesurer. Le système {polystyrène + azote} a permis de valider la technique couplée dans une très large gamme de température et de pression (jusuq'aux pressions de 70 MPa). Ce dispositif novateur a permis l'étude originale des systèmes {PS+CO2} et {PS+HFC-134a}. Les mesures expérimentales de la solubilité et du gonflement ont fait l'objet de corrélations par le modèle dual, l'équation d'état de Sanchez-Lacombe et la théorie SAFT
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Courtial, Xavier. "Détermination de coefficients de partage et de limites de solubilité du méthanol dans des mélanges liquides comportant azote et hydrocarbure(s) aux conditions opératoires des unités de fractionnement du gaz naturel." Phd thesis, École Nationale Supérieure des Mines de Paris, 2008. http://pastel.archives-ouvertes.fr/pastel-00005035.
Анотація:
Après le traitement du gaz naturel, le méthanol est présent sous forme de traces. Notre objectif est de déterminer les propriétés thermodynamiques des mélanges “hydrocarbure(s) – méthanol“ aux conditions opératoires rencontrées lors du fractionnement du gaz naturel, à hautes et basses températures. En effet, les industries peuvent être pénalisées financièrement lorsque la teneur finale en méthanol dépasse 50 ppm molaire. Pour cela, nous souhaitons connaître les équilibres entre phases aux conditions spécifiques régnant dans ces unités. Peu de données existent pour de si faibles teneurs en méthanol. De plus, les modèles thermodynamiques utilisables sur l'ensemble du domaine de compositions ne permettent pas de représenter correctement les équilibres à dilution infinie. Un appareillage, basé sur une technique "statique-analytique" avec échantillonnages des phases et analyse par CPG est utilisé. A hautes températures, nous avons déterminé les coefficients de partage du méthanol. L'appareillage a été adapté au cours du temps, afin d'améliorer la quantification de traces de méthanol (inférieures à 1 000 ppm). Une procédure d'étalonnage originale tenant compte de l'adsorption du méthanol dans les circuits d'analyse a été mise au point. Les nouvelles mesures montrent qu'à l'incertitude expérimentale près, la pression totale du système ainsi que le coefficient de partage du méthanol sont seulement fonctions de la température. Les constantes de la loi de Henry ainsi que les coefficients d'activité à dilution infinie du méthanol sont calculés. A basses températures, nous souhaitons déterminer les valeurs limites de solubilité du méthanol dans les mélanges liquides : azote - hydrocarbure(s). Un appareillage est en cours d'adaptation pour réaliser ces mesures. Les nouvelles données serviront de bases au développement des simulateurs de procédés de fractionnement, en vue d'estimer le plus précisément possible les teneurs en méthanol dans les hydrocarbures produits.
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Chapoy, Antonin. "Etude des équilibres des systèmes : Eau-hydrocarbures-gaz acides dans le cadre de la production de gaz." Phd thesis, École Nationale Supérieure des Mines de Paris, 2004. http://pastel.archives-ouvertes.fr/pastel-00001202.
Анотація:
Dans les gisements, en cours de production ou dans les conduites de transport, les gaz naturels se trouvent fréquemment au contact d'une phase aqueuse. Les conditions sont telles que les pressions peuvent atteindre de très haute valeur dans une large gamme de températures. La connaissance du comportement des systèmes "eau-hydrocarbures" est donc essentielle à la profession profession pétrolière ainsi que celles des systèmes "eau-hydrocarbures-inhibiteur thermodynamique " pour lesquelles les données sont rares. Des mesures de teneur en eau ont été réalisées dans les phases vapeurs de différents systèmes d'hydrocarbures: méthane et éthane, et dans un mélange d'hydrocarbures gazeux (méthane 94%, éthane 4%, n-butane 2%) dans des conditions proches de la formation d'hydrates (de 258.15 à 313.15 K et jusqu'à 34.5 MPa) en présence ou non d'inhibiteurs tels que le méthanol ou l'éthylène glycol. Des mesures de solubilités de gaz des principaux constituants du gaz naturel ont été effectuées dans une large gamme de pressions et de températures. Ces mesures ont été effectuées avec deux techniques expérimentales, une technique statique-analytique avec échantillonnage de phases et une technique synthétique avec cellule à volume variable. Pour réaliser le traitement des données un logiciel a été développé, ce logiciel a permis l'ajustement et le traitement des résultats expérimentaux.
Книги з теми "Azote – Solubilité":
1
Strekhletov, A. N. Rastvorimostʹ azota v ali͡u︡mosilikatnykh rasplavakh. Novosibirsk: Rossiĭskai͡a︡ akademii͡a︡ nauk, Sibirskoe otd-nie, Obʺedinennyĭ in-t geologii, geofiziki i mineralogii, 1991.
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Siwka, Jerzy. Azot w ciekłych stopach żelaza. Częstochowa: Wydawn. Politechniki Częstochowskiej, 2006.