Abstract
The main limitation of rate-based approach in Aspen Plus is the unavailability of the method under dynamic analysis. Hence, to support the development of the integrated process of natural gas treatment at a higher scale, a comprehensive equilibrium and rate-based simulations of CO2 removal via potassium carbonate promoted with glycine (PCGly) is conducted. The purpose of this study is to observe the efficiency of the equilibrium-based model to represent the CO2 removal system before the dynamic simulation can be developed. The validation is conducted based on published experimental data and the result shows that at steady state, the equilibrium-based method is able to predict the CO2 removal as satisfactorily as the rate-based approach. The error deviation between both methods is 2.11 % and through this study, it is shown that the equilibrium-based method is able to simulate the CO2-PGly system efficiently. Thus, this would enable further investigation of the CO2-PGly system under dynamic simulation using the equilibrium-based method.
Highlights
The impact of the world’s growing population and the need to fulfil high energy demand from industry have alerted the gas industry players to further explore on alternative potential energy source
The abundance of natural gas resources that often associated with stranded gas fields due to high CO2 content must be carefully evaluated to ensure the trade-off between quality and cost can be optimized
The known CO2-PCGly system is simulated in order to predict the CO2 removal based on the equilibrium and rate based methods
Summary
The impact of the world’s growing population and the need to fulfil high energy demand from industry have alerted the gas industry players to further explore on alternative potential energy source. The abundance of natural gas resources that often associated with stranded gas fields due to high CO2 content must be carefully evaluated to ensure the trade-off between quality and cost can be optimized. Natural gas reserves in commercial operations throughout the world include variable amounts of CO2 ranging from CO2 free to as high as 90% CO2 content [1]. Various promoters have been introduced to overcome this limitation and a few criteria have been listed as guidance to choose which promoter is suitable to be used effectively with potassium carbonate. This includes a level of toxicity, the enhancement of rate absorption and solvent cost [3]
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