کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
620421 | 1455169 | 2015 | 7 صفحه PDF | دانلود رایگان |
• A design of distillation process has been elaborated for three ternary industrial mixtures.
• Effective entrainers have been chosen on the basis of thermodynamic criterion.
• Selectivity diagrams were used to determine favorable composition regions for separation.
• Modeling of ED consequences with selected entrainers was performed, energy consumptions were evaluated.
Continuous extractive distillation is a widely used method to separate binary and multicomponent azeotropic mixtures. Large-scale application and heavy energy usage play an important role in discovering more efficient separating agents. Separating agent (entrainer) selection for extractive distillation of binary mixtures is usually based on the analysis of relative volatility diagrams of components to be separated. Selective effect of entrainer is due to the differences in character and intensity of intermolecular interactions between entrainer and original mixture compounds. Accordingly, it is reasonable to additionally evaluate excess Gibbs energy magnitudes in binary systems formed by compounds of original mixture and entrainer (Raeva et al., 2011a).Separating agent selection based on thermodynamic criterion is not uniquely defined for ternary mixtures yet. It establishes some steps of entrainer choice for extractive distillation of ternary mixtures containing several azeotropes. Substantiation of entrainer efficiency is proved by separation of industrial mixtures: tetrahydrofuran–methanol–water, ethyl acetate–ethanol–water and acetonitrile–methanol–water.1,2-Ethandiol is well known to be an effective entrainer for different type of systems, including aqueous mixtures of organic substances (Gomez and Gil, 2009 and Frolkova and Raeva, 2010). Glycerol is becoming more embroiled into separation processes due to environmental issues. They both fill in the common requirements for entrainer: by sufficiently changing the relative volatility of the substances to be separated and avoiding formation of new azeotropes with components of separating mixtures.
Journal: Chemical Engineering Research and Design - Volume 99, July 2015, Pages 125–131