Study On Absorption Of CO₂ In Flues Into Aqueous Solutions Of SG

CO₂ separation and capture has been extensively studied in recent years because of environmental concern of greenhouse effect and potential resources. The choice of absorbent has been focused on in the chemical absorption research. Features of single aqueous sodium glycinate (SG) and mixed solutions systems, absorption mechanism were studied, which may sever future study as groundwork.Absorption performance of CO₂ into single aqueous SG (1.0～4.0 kmol·m^-3) and the aqueous blends of 2-amino-2-methyl-l-propanl (AMP) and SG were investigated at different temperatures (298～323 K) using a double stirred-cell absorber. The relationships between the absorption rate, absorption capacity and absorption time were analyzed. The results indicated that aqueous blends of 1.5 kmol·m^-3 AMP and 0.6 kmol·m^-3 SG was much more suitable as submarine-based CO₂ scrubbers. It was demonstrated that the kinetics region of absorption CO₂ into single aqueous SG and the aqueous blends of AMP and SG was the fast pseudo-first order reaction regime.To determine its regeneration behavior, single aqueous SG and the aqueous blends of AMP and SG was investigated by the means of regeneration heating. The CO₂ absorption and regeneration characteristics were experimentally examined under various operating conditions. Experimental results showed that the regeneration efficiency of single aqueous SG increased from 80.0% to 92.6% during temperature range of 363 K to 403 K. The most suitable regeneration temperature and time for single aqueous solution are 388 K and 76 min respectively. The most suitable regeneration temperature for the aqueous blends of AMP and SG was 378 K in our experiment condition. Under the same experimental conditions, the regeneration efficiency can be ranked in the following order: AMP+SG>AMP+MEA>AMP+DEA. It was demonstrated that the aqueous blends of AMP and SG was easier to regenerate with saving energy and less loss of absorption capacity than other amines. It was concluded that the aqueous blends of AMP and SG was fitted for industry.