| Summary: | 碩士 === 國立清華大學 === 化學工程學系 === 104 === Amino acid salts are of great interest as potential solvents for CO2 capture because they are considered have a relatively fast rate of CO2 absorption, less volatile, higher stability towards oxygen and thermal and environmentally friendly. This research aims to find out the potential amino acid salt as absorbent primarily by investigating their absorption and desorption performance, and to apply the potential absorbent in rotational packed bed (RPB). Compared with traditional packed bed (PB), the rotational packed bed could provide higher KGa, and have smaller equipment volume, which could further increase the capture efficiency.
The experimental results show that the viscosity of PZ/DETA/Na ADS (15 wt%/15 wt%/10 wt%) is 1.48 times the viscosity of PZ/DETA(15 wt%/15 wt%). Although the higher viscosity could lower the diffusion coefficient, and increase the Henry constant of CO2 in absorbent, but the amount of free amines in PZ/DETA/Na ADS (15 wt%/15 wt%/10 wt%) is more than the ones in PZ/DETA(15 wt%/15 wt%). Also, he absorbent could be split into small drops and well-dispersed with the shear stress of RPB, and this could further reduce the viscosity effect. As a result, PZ/DETA/Na ADS (15 wt%/15 wt%/10 wt%) has similar capture performance as PZ/DETA(15 wt%/15 wt%).
The RPB continuous operations of absorption and desorption results show that under 2 atm 120 oC situation, the PZ/DETA/Na ADS (15 wt%/15 wt%/10 wt%) could be regenerated with 8.8% lower energy than conventional absorbent 30 wt% MEA. This is because that the reaction energy and sensible heat of PZ and DETA are both lower than the ones of MEA, and it also had high CO2 capture efficiency.
PZ/DETA/Na ADS (15 wt%/15 wt%/10 wt%), as the most promising absorbent, could be regenerated with lower energy than conventional absorbent 30 wt% MEA, and it also had high CO2 capture efficiency and CO2 capacity. Besides, DO value in the formula is lower, so it can reduce the corrosion.
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