CO_2-H_2 GAS SEPARATION WITH IONIC LIQUID

• Main Author: Budi Sekarwangi, Mabelle
• Format: Theses
• Language: Indonesia
• Subjects: Teknik kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/74377
• Institution: Institut Teknologi Bandung

<p align="justify">The need for fuel, chemicals, and climate change issues has caused increasing public concern about the use of H2. The technology development to separate CO2 and H2 in the natural gas vapor reforming process is urgently needed. Ionic liquids are environmentally friendly solvents with suitable characteristics for CO2 absorption in the pre-combustion line. Until now, very few researchers have reported the solubility of H2 and the selectivity of ionic liquids for CO2/H2. Imidazolium cation-based liquids have been studied the most because they tend to be in the liquid phase at room temperature. [EMIm][TFSI] ionic liquids are reported to have a high ability to absorb CO2. Still, no one has compared it to the solubility of CO2 and H2 in cathode-based ionic liquids [EMIm]+ with [HSO4]- and [Cl]- anodes. The weakness of ionic liquids is their high viscosity, so PEG reduces the viscosity. Therefore, this study will discuss the solubility of CO2 and H2 and the selectivity of CO2/H2 in various types of solvents tested, namely [EMIm][HSO4], [EMIm][TFSI], [EMIm][Cl], and PEG. This research has three stages: solvent preparation, gas absorption, and gas solubility testing in each solvent. Gas absorption was carried out at laboratory room temperature and pressure. The solubility of a gas in a solvent is determined by comparing the moles of dissolved gas to the moles of solvent. The selectivity of CO2/H2 is done by comparing the moles of dissolved CO2 with the moles of dissolved H2. Based on the experimental results with ionic liquids, the highest CO2 solubility was found in [EMIm][HSO4] ionic liquid, which was 0.0553 CO2 gas moles/solvent moles. In contrast, the lowest H2 solubility was found in [EMIm][TFSI] ionic liquid, which was 0.7598 H2 gas moles/solvent moles. CO2 solubility increases when ionic liquid is mixed with PEG to 0.0671 CO2 gas moles/solvent moles. The solubility of H2 in PEG also has the lowest value of all solvents, 0.0338 H2 gas moles/solvent moles.