Abstract
This paper presented the effect of CO2concentration in the gas feed to the CO2absorption performance using a green solvent, potassium carbonate promoted with glycine (PCGLY). Recently, the performance of this solvent (with precipitates) was hindered by its poor mass transfer performance due to the blockage in packings and piping. Therefore, this study focused to study the CO2 absorption performance of non-precipitating potassium carbonate promoted with glycine. This green solvent contains aqueous blend of 15wt% potassium carbonate and 3 wt% glycine. The absorption performance of the solvent was obtained by demonstrated a few experimental works using a bench scale packed absorption column. The packing type was Sulzer metal gauze and the column consisted of six sampling point which located equidistance along the packing.The effect of CO2 concentration at the gas feed was assessed in term of its CO2 removal efficiency and concentration profile along the packing. The study shows the decreasing trend of CO2 removal as CO2 inlet concentration in the gas feed increases. The reason of this behavior is due to the limited reactant of liquid phase to absorb high CO2concentration in gas phase. The main outcome of this study demonstrated the efficient absorption which can absorb up to 79.24 % of CO2from natural gas using non-precipitated PCGLY.
Highlights
As yet, the interest to explore undeveloped natural gas resources is tempered by the risk to encounter with high non-hydrocarbon concentration which reduces the gas heating value and increases corrosion risk to the pipeline [1]
Shaikh et al [12] had reported the solubility of a new solvent blend known as aqueous potassium carbonate promoted with glycine (PCGLY) which is found to be comparable with conventional solvents
The liquid flow rate was controlled by a liquid flow controller, which was equipped with a back-pressure regulator
Summary
The interest to explore undeveloped natural gas resources is tempered by the risk to encounter with high non-hydrocarbon concentration which reduces the gas heating value and increases corrosion risk to the pipeline [1]. Aqueous amine – based solvent is the common type of chemical solvent and has been commercialized for many decades in CO2 removal process [6,7,8]. The use of aqueous amine-based solvent in chemical absorption CO2 removal system might be not suitable for offshore condition. Shaikh et al [12] had reported the solubility of a new solvent blend known as aqueous potassium carbonate promoted with glycine (PCGLY) which is found to be comparable with conventional solvents. It possesses several advantages over amine-based solvent including less toxicity, non-degradation, and require lower regeneration energy [13]. The characteristics of PCGLY are suitable for offshore condition and provides motivation for the insight study in term of its CO2 removal efficiency and mass transfer performance at continuous system of packed absorption system [5]
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