chemicallytechFine Chemical TechnologiesТонкие химические технологии2410-65932686-7575MIREA – Russian Technological University (RTU MIREA).10.32362/2410-6593-2018-13-1-33-44chemicallytech-132Research ArticleTHEORETICAL BASIS OF CHEMICAL TECHNOLOGYТЕОРЕТИЧЕСКИЕ ОСНОВЫ ХИМИЧЕСКОЙ ТЕХНОЛОГИИRELATIONS BETWEEN THE DIFFERENCES OF DIFFERENT PROPERTIES OF FREONES ON THE SATURATION LINES UPON LIQUID-VAPOR PHASE TRANSITIONО ВЗАИМОСВЯЗИ РАЗНОСТЕЙ РАЗЛИЧНЫХ СВОЙСТВ ФРЕОНОВ НА ЛИНИЯХ НАСЫЩЕНИЯ ПРИ ФАЗОВОМ ПЕРЕХОДЕ ЖИДКОСТЬ-ПАРАрутюновБ. А.ArutyunovB. A.

доктор технических наук, профессор кафедры процессов и аппаратов химических технологий имени Н.И. Гельперина

119571, Россия, Москва, пр-т Вернадского, д. 86

Dr.Sc. (Engineering), Professor, N.I. Gel’perin Chair of Processes and Apparatus of Chemical Technologies

86, Vernadskogo Pr., Moscow 119571, Russia

noemail@neicon.ruРытоваЕ. В.RytovaE. V.

аспирант кафедры процессов и аппаратов химических технологий имени Н.И. Гельперина

119571, Россия, Москва, пр-т Вернадского, д. 86

Post-Graduate Student, N.I. Gel’perin Chair of Processes and Apparatus of Chemical Technologies

86, Vernadskogo Pr., Moscow 119571, Russia

erytova@gmail.comКалымбетГ. П.KalymbetG. P.

магистр кафедры процессов и аппаратов химических технологий имени Н.И. Гельперина

119571, Россия, Москва, пр-т Вернадского, д. 86

Master, N.I. Gel’perin Chair of Processes and Apparatus of Chemical Technologies

86, Vernadskogo Pr., Moscow 119571, Russia

noemail@neicon.ruМосковский технологический университет (Институт тонких химических технологий имени М.В. Ломоносова)РоссияMoscow Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)Russian Federation2018280220181313344Copyright © Arutyunov B.A., Rytova E.V., Kalymbet G.P., 20182018Арутюнов Б.А., Рытова Е.В., Калымбет Г.П.Arutyunov B.A., Rytova E.V., Kalymbet G.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.finechem-mirea.ru/jour/article/view/132

To construct a generalized dependency, a scale for the unknown quantities and variables must be selected. The states of points are located in P-V-T (pressure-volume-temperature) space. The scale for the construction of generalized dependences of the studied properties and variables of the problem must be sustainable. In order to find a sustainable transition from liquid to vapor the behavior of the characteristic function of free energy is investigated. Since the phase transition occurs at a constant temperature, free energy is equal to expansion work. In the analysis of the liquid-vapor transition, the curve of the temperature dependence of expansion work for all investigated substances has a maximum. The temperature corresponding to the maximum expansion work is denoted by Tm. It was noted that temperature Tm associated with Tc (critical) with the simple relation Tm =0.76Tс with a spread of 2%. Naturally, this state corresponds to the free energy minimum value, and in accordance with the principle of minimality of characteristic functions of this process is stable. Therefore, the parameters of this process were chosen as the bringing scale in the construction of dimensionless dependencies. In this paper we use the method of constructing generalized dependencies in the reduced form, based on the characteristic functions minimality principle. Approximating formulas were obtained for calculating reduced heat of evaporation from reduced density, entropy, and freons surface tension. The reduction scale is considered on the liquid and vapor saturation line under substances consideration. The characteristic functions minimality principle is used. In the course of the analysis, calculation formulas were derived for pure freons both individually and in a combined form. The interrelation between the differences of these thermodynamic properties on the saturation line during a liquid-vapor phase transition is shown. This makes it possible to determine some properties using other methods by calculation.

Получены аппроксимирующие формулы для расчета приведенной теплоты парообразования в зависимости от приведенной плотности, энтропии и поверхностного натяжения для чистых фреонов. Для выбора масштабов приведения используется принцип минимальности характеристических функций. Масштабы приведения считаются на линии насыщения жидкости рассматриваемых веществ. При наличии уравнения состояния масштабом приведения для искомых свойств и переменных принимаются параметры критического состояния. В качестве переменных при исследовании свойств веществ используются приведенные величины плотности, энтропии и поверхностного натяжения. По предполагаемой теории исследуемые свойства не зависят от внешних воздействий. Для нахождения устойчивого перехода из жидкости в пар исследуется поведение характеристической функции свободной энергии. В исследуемых зависимостях имеется максимум работы расширения при определенной температуре Tm. И в соответствии с принципом минимальности характеристических функций этот процесс устойчив, поэтому параметры этого процесса выбраны в качестве масштабного состояния. Показана взаимосвязь разностей этих термодинамических свойств на линии насыщения при фазовом переходе жидкость-пар, что дает возможность расчетным путем определить одни свойства через другие.

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The authors declare that there are no conflicts of interest present.