Mass Transfer Performance Study for CO 2 Absorption into Non-Precipitated Potassium Carbonate Promoted with Glycine Using Packed Absorption Column

Nur Farhana Ajua Mustafa, Azmi Mohd Shariff, Wee Horng Tay, Hairul Nazirah Abdul Halim and Siti Munirah Mhd Yusof
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Nur Farhana Ajua Mustafa: CO2 Research Centre (CO2RES), Institute of Contaminant Management, Chemical Engineering Department, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia
Azmi Mohd Shariff: CO2 Research Centre (CO2RES), Institute of Contaminant Management, Chemical Engineering Department, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia
Wee Horng Tay: CO2 Research Centre (CO2RES), Institute of Contaminant Management, Chemical Engineering Department, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia
Hairul Nazirah Abdul Halim: School of Bioprocess Engineering, Universiti Malaysia Perlis, Kompleks Pengajian Jejawi 3, Arau 02600, Perlis, Malaysia
Siti Munirah Mhd Yusof: CO2 Research Centre (CO2RES), Institute of Contaminant Management, Chemical Engineering Department, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia

Sustainability, 2020, vol. 12, issue 9, 1-17

Abstract: The removal of carbon dioxide (CO 2 ) at offshore operation requires an absorption system with an environmentally friendly solvent that can operate at elevated pressure. Potassium carbonate promoted with glycine, PCGLY, is a green solvent that has potential for offshore applications. For high solvent concentrations at elevated pressure, the by-product of CO 2 absorption consists of precipitates that increase operational difficulty. Therefore, this study was done to assess the CO 2 absorption performance of non-precipitated PCGLY with concentration 15wt%PC+3wt%GLY, which is known to have comparable solubility performance with MDEA. A packed absorption column was used to identify the CO 2 removal efficiency, mass transfer coefficient in liquid film, k l a e , and overall volumetric mass transfer coefficient, K G a v . A simplified rate-based model was used to determine k l a e and K G a v based on the experimental data with a maximum MAE value, 0.057. The results showed that liquid flow rates and liquid temperature gives significant effects on the k l a e and K G a v profile, whereas gas flow rate and operating pressure had little effect. The CO 2 removal efficiency of PCGLY was found to be 77%, which was only 2% lower than 1.2 kmol/m 3 MDEA. K G a v of PCGLY is comparable with MDEA. The absorption process using PCGLY shows potential in the CO 2 sweetening process at offshore.

Keywords: CO 2 absorption; mass transfer coefficient; potassium carbonate; glycine; packed absorption column (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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