Chemical absorption using hot potassium carbonate (K2CO3) is believed to be a more energy‐efficient post‐combustion CO2 capture technology as compared to conventional amine‐based absorption processes. That notwithstanding, literature information on how process modifications could render this technology more appealing are limited. In this study, seven different modified process configurations have been investigated to observe their impacts on the system performances of a typical hot K2CO3‐based capture system. The results demonstrate that flue gas precooling is capable of improving the carbon removal level in the K2CO3‐based capture system by 11.46% over the base case value. This was achieved by precooling the flue gas stream from 110 to 70°C before feeding into the absorber column. Other modified process systems such as the rich solvent pre‐heating and lean vapour compression were equally observed to decrease the specific stripper reboiler duty by 24.28% and 21.38%, respectively. The findings from this research prove that process modifications are capable of enhancing the system performances of the hot K2CO3‐based post‐combustion CO2 capture technology. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.
Extensive research works on CO2 capture process using MEA have been carried out and showed promising results. Nevertheless, it has been acknowledged that the use of MEA is associated with high cost, solvent degradation issues and corrosion. The issues above have motivated researchers to explore and test other potential solvents such as aqueous ammonia (NH3). As result, NH3 based CO2 capture systems have recently attracted much attention as an alternative to MEA based counterparts. Despite their encouraging applications, high volatility of NH3 raise concerns on the energy requirement related to the solvent recovery. Consequently, energy efficient NH3 based CO2 capture systems by modifying the process is desirable. This study, therefore, aims to propose and evaluate three different stand-alone process configurations of absorption-desorption processes in a NH3-based system and compare them with the traditional absorption-desorption system in respect to total energy consumption. These modifications include Rich Solvent Split (RSS), Lean Vapor Compression (LVC), and Rich Vapor Compression (RVC). Results indicate that among these three proposed process modifications, LVC led to the highest reboiler energy savings of 38.3% and total energy savings of 34.5% compared to NH3 based conventional configuration. These findings can serve as essential recommendations for further studies on and large-scale implementations of aqueous NH3 as a better solvent.
The solubility of Black Pepper Oil (BPO) was measured in Supercritical Carbon Dioxide (SC-CO2). The temperatures and pressures of the extraction were chosen in the range of 313 – 333K and 100 - 300 bars, respectively. The solubilities attained ranged between 0.27 x 10-5 to 2.88 x 10-5 g extract/g CO2. 5 different empirical models were selected to predict the solubility of BPO in SC-CO2. Among the 5 empirical models, Belghait model resulted in the lowest but best absolute average relative deviation (AARD) of 14.90%.
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