Parametric Study on Potassium Carbonate-Glycerin Deep Eutectic Solvent for Carbon Dioxide Capture

Author : Cabantog, Freya Ann Guzman
Major Adviser : Migo, Veronica P. 
Committee Members : Gatdula, Kristel M.; Bautista, Ramer P. 
Year : 2018
Month : June
Type : Thesis
Degree: BS
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A 2-level factorial design was conducted in order to investigate the effect of (A) potassium carbonate (K₂CO₃) to glycerin ratio of DES, (B) CO₂ flow rate, (C) presence of water in the DES, and (D) temperature of the system on the CO₂ solubility. This was performed to gain insights into the application of the K₂CO₃-glycerin DES as an alternative solvent for CO₂ capture. Fresh samples of 1:4 and 1:6 DES were synthesized based from the method of Naser et al. (2013) for the study. Gravimetric method using Ohaus Pioneer analytical balance was done for the quantitative analysis of CO₂ solubility in each run while the qualitative analysis was done using FT-IR Thermo Scientific Nicolet 6700. The highest CO₂ solubility with an average of 0.033 gCO₂/gDES was reached at 1:6 K₂CO₃ to glycerin ratio of DES in the absence of water, at CO₂ flow rate of 1 L/min, at temperature of 45°C. All the four factors, as well as interactions BC, AB, BD, AD, and ABD generally exerted significant effects on CO₂ solubility based from the Pareto chart, half-normal plot, and ANOVA. Statistical models were generated from the runs, which could be used for numerical optimization. In addition, the spectra of DES before and after the solubility experiment indicated that physical absorption governed the solubility of CO₂ in the DES. Further studies can also be conducted to determine the DES’s CO₂ selectivity, its absorption capacity, and cyclic capacity.

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