چكيده به لاتين
In this project, the solubility of Acidic gases of carbon dioxide and hydrogen sulfide in ionic liquids base Imidazolium is calculated by the SAFT HR equation of state. The ionic liquids used in this project are 12 types of ionic liquids with Imidazolium cation [Cnmim] (n = 2,4,6,8) (Cn is an alkyl ring attached to cation imidazolium ) and three different anions of trifluoro methyl sulfonyl [TF2N], hexafluorophosphate [PF6] and tetrafluoroborate [BF4]. All ionic liquid parameters are fitted to the ionic liquid density data. Also, to increase the accuracy of the SAFT HR equation of state Double interaction coefficients are fitted on solubility data at each temperature and a relationship has been reported for the relevancy of the interaction coefficient to the temperature. To calculate the solubility of acid gas in ionic liquid, two different approaches are considered: in the first approach, ionic liquid is modeled as a substance without association, and in the second approach, ionic liquid is modeled as a association material with 2B association scheme. For two-component systems, Average Percentage of absolute deviation of calculation of mole fraction of CO2 in ionic liquid in the first and second approaches in the range of 0.38-15.18% and 0.36-15.23%, respectively, and for the mole fraction of H2S in the first and second approaches in the range of 1.06-9.64% and 0.77-8.61% respectively, in the whole range of temperature and pressure and with binary interaction coefficients have been obtained. Finally, the two triple systems CO2+H2S+[omim] [TF2N] and CO2+H2S+[omim] [PF6] are modeled using the second approach and double interaction coefficients. Average Percentage of absolute deviation of calculation of mole fraction of CO2 and H2S in the liquid phase for the CO2 + H2S + [omim] [TF2N] system is 8.08% and 5.4%, respectively and for the CO2 + H2S + [omim] [PF6] system, is 11.07% and 5.5% in the whole range of temperature and pressure.
