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The authors calculated thermal and physical properties of gas mixture by different methods. It was shown that for some separation modes there are conditions of non-monotonic change of structure with extremums that influence significantly the physical properties and intensity of exchange processes of heat and mass transfer in multicomponent hydrocarbon media. Regularities and peculiarities of changes in structure of gas mixture depending on temperature and pressure were studied. The authors have studied the features of separation modeling in hydrocarbon media within the thermodynamic equilibrium and discussed the approaches to calculation of phase equilibrium in multicomponent systems.
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The methods used in the study: thermodynamic models in HYSYS software such as Peng-Robinson equation of state, Lee-Kesler-Ploc-ker equation of state, NRTL equation, Grayson-Streed semi-empirical model method of statistical mechanics (Chapman-Enskog method) method of corresponding state (Golubevfs method) similarity theory. The main aim of the study is to determine the regularities of separation in hydrocarbon media within the framework of equilibrium thermodynamics to give recommendations for practice of applied calculations of component composition under separation of multicomponent mixture at following thermobaric conditions: the temperature is T≅0-70☌ and pressure is P≅50-700 kPa. operation of equipment for oil and gas preliminary preparation. Therefore, the research field, related to prediction of phenomena and regularities of separation, is relevant and practically significant for design and.
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The techniques of separation driving in rheologically complex hydrocarbon media, which are based on modern multiparametric models, are topical and form a basis for obtaining valuable empirical information on multicomponent viscous media flow. The evaluation of the thermodynamic performance of the process, which is based on a detailed exergetic analysis, represents the first step in a comprehensive evaluation of this concept to be conducted in the future. the concentration of the sulfuric acid solution on the overall efficiency is discussed. The influence of important process parameters, e.g. The overall process is characterized by very high energetic and exergetic efficiencies in comparison with other energy conversion systems in which electric power or hydrogen are generated using the same energy inputs. Detailed results of the simulation are presented.
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The commercial process simulator Aspen Plus was used for the thermodynamic modeling of this process. products SO2 and CO2 are removed as compressed liquids from the overall process. The process is a true “zero emission process” because (a) no NOX is formed during coal combustion with sulfuric acid, and (b) the combustion. Coal and high-temperature heat are used as input energy to the process. two important energy products for the future. This paper presents a detailed description and thermodynamic analysis of a novel process generating electric energy and hydrogen, i. Consideration is given to prediction of ternary vapor-liquid and ternary liquid-liquid equilibria based on binary data alone.
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By proper selection of α12, the new equation gives an excellent representation of many types of liquid mixtures while other local composition equations appear to be limited to specific types. The new equation contains a nonrandomness parameter α12 which makes it applicable to a large variety of mixtures. For the same activity coefficients at infinite dilution, the Gibbs energy of mixing is calculated with the new equation as well as the equations of van Laar, Wilson, and Heil these four equations give similar results for mixtures of moderate nonideality but they differ appreciably for strongly nonideal systems, especially for those with limited miscibility. A new equation is derived, based on Scott's two-liquid model and on an assumption of nonrandomness similar to that used by Wilson. A critical discussion is given of the use of local compositions for representation of excess Gibbs energies of liquid mixtures.