رضا لشكربلوكي

Today, despite the importance of producing and using stable isotopes, especially oxygen isotopes, more studies are needed on the production process of these valuable products. In this research, among the various methods of isotope separation such as electrolysis, chemical exchange, ion exchange, etc., on the distillation process, which is one of the most common methods of producing oxygen isotopes, has been studied. Among the various methods of separating isotopes such as electrolysis, chemical exchange, ion exchange, etc., distillation method is one of the most common methods in separating oxygen isotopes. Due to the low concentration of heavy oxygen isotopes such as 18O in natural water and the low volatility of these compounds, they are separated and concentrated in very high cascading columns, which takes a very long time to set up and achieve equilibrium conditions. In this study, in order to reduce the startup time and access to experimental information in a shorter period of time, one number of distillation columns filled with CY-SULZER packing were used in total reflux conitions. In this research, non-equilibrium modeling and its application as a more accurate dynamic model than equilibrium models in the 18O isotope separation process has been considered. In this modeling, the isotope interaction and exchange of compounds was calculated and estimated using probability theory based on molecular collisions between isotope compounds. The model equations are of the conventional and algebraic differential type, which were solved using Euler method and coding in MATLAB. Then, simulation results for two equilibrium and non-equilibrium models at the top and bottom of the distillation column were eva‎luated and compared using data obtained from a semi-industrial unit. The results of comparing non-equilibrium modeling with experimental data showed that this model is more accurate than the equilibrium model in describing the 18O isotope separation process. The error obtained in the top and bottom of the column results was 8.5% for deuterium isotope and 15.5% for 18O isotope. Finally, optimization studies were performed to obtain optimal operating conditions such as pressure and distillation column reflux using the Surface Fitting tool of the MATLAB software in the study column.

استفان-ماكسول , غيرتعادلي , مدلسازي تعادلي , تقطير , ايزوتوپ O18

Stephen-Maxwel , non-equilibrium , equilibrium modeling , distillation , 18O isotope

Reza Lashkarboluki

Shahrokh shahhosseini