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Title: Simulation of Carbon Dioxide Absorption By 1-Butyl-3-Methylimidazolium Tetrafluoroborate [Bmim][Bf4]
Authors: Manal Al-Humaidi Al-Hajri 
Supervisor: Prof. Mousa K. Abu-Arabi
Keywords: Ionic Liquid : CO2 capturing : Equation of State
Issue Date: 2019
Publisher:  Kuwait university - college of graduate studies
Abstract: Reducing carbon dioxide emissions by a technique that can be used in capturing carbon dioxide produced by the existing power plant, refineries and other sources is being a global obsession these days. Capturing CO2 from flue-gas stack will help in managing global warming risk by storing the captured CO2 in geological formations. Therefore, finding a green system using environmental friendly materials is the ultimate goal. In this thesis, Simulation of capturing CO2 from post-combustion flue gas by modelling a system in Aspen Plus® using ionic liquid (IL) as a solvent is done. Starting with screening for suitable IL based on experimental data available in the open literature, choosing appropriate equation of state (EoS) imbedded in Aspen Plus® and then design the required absorption/regeneration vessels. This system can be applied in refineries for capturing CO2 from flue gas by passing the flue gas through vessel filled with IL operating under pressure. Once the absorption vessel is exhausted, the captured CO2 will be sent to a storage tank in the regeneration stage by reducing the pressure of the absorption vessel to about atmospheric pressure. From making literature survey, it was found that [hmim][FAP] IL is having the highest CO2 solubility, but lacks the data needed for simulation by Aspen Plus®. However, [bmim][Bf4] is the only IL with all required temperature dependent data available for Aspen Plus® and have relatively high solubility capacity for CO2. Therefore, [bmim][Bf4] is selected to be investigated in this work. The following EoSs were investigated to predict the solubility of CO2 in [bmim][Bf4] IL via Aspen Plus®: 1.Peng-Robinson EoS with Wong-Sandler mixing rule (PRWS). 2.Redlich-Kwong (RK). 3.Soave-Redlich-Kwong (SRK). 4.Peng-Robinson (PR). 5.Non-Random Two-Liquid model with Redlich-Kwong (NRTL-RK). 6.Ideal Gas EoS with Universal Quasi Chemical (UNIQUAC) activity coefficient model for the liquid phase. 7.NRTL- RK without Henry’s Constant. Peng-Robinson with Wong-Sandler mixing rule EoS gives the lowest average absolute relative deviation (AARD = 4.88%) and gives the best prediction over the pressure range relative to experimental results.
Appears in Programs:0640 Chemical Engineering

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