چكيده به لاتين
Sulfur is one of the most common impurities in lubricants, fuels, natural gas, et cetera. The presence of sulfur can lead to irreparable damage to the environment, animals, and humans, as well as many process problems in the industry such as increased corrosion rate of metals and other materials, emission of harmful gases such as H_2 S and SO_2, corrosive wear in pipelines, tanks, and industrial equipment, et cetera. In recent decades, eco-friendly technologies, known as green technologies, have received great attention in achieving goals such as safer, cleaner and more efficient processes with greater economic benefits. In this regard, deep eutectic solvents have been introduced as a promising option for sulfur separation; and many studies and experiments have been conducted in this field. In this research, while introducing deep eutectic solvents and reviewing previous studies, the solubility of H_2 S and SO_2 gases in these solvents, was investigated and thermodynamic of this solubility was performed. The method used in this study for vapor-liquid equilibrium is the φ-φ method using the Peng-Robinson equation of state and the Van der Waals mixing rules for the vapor and Wong-Sandler with the NRTL activity coefficient for the liquid phase. For this purpose, systems containing H_2 S and SO_2 gases and deep eutectic solvents at different temperatures, pressures and ratios of hydrogen bond donors and hydrogen bond recipients were investigated. MATLAB software version R2020a was used for the modeling. In order to check the consistency of experimental and computational data, AARD% error was used. According to the modeling and error rate analysis, it can be concluded that this modeling method provides acceptable results and Wong-Sandler mixing rule with NRTL activity coefficient model leads to increase in the accuracy of Peng-Robinson equation of state.
Keywords: desulphurization, deep eutectic solvent, Thermodynamic modeling, Peng-Robinson EOS, Wong-Sandler mixing rules.
