Solubility of Carbon Dioxide in Mixtures of 2-Amino-2-Methyl-1-Propanol and N-Methyl-2-Pyrrolidone at Absorption and Desorption Conditions

This work is a part of the evaluation of a novel technique for carbon capture that can be used for CCS (carbon capture and storage) in industry. The technique is based on chemical amine absorption and involve the sterically hindered amine 2-amino-2-methyl-1-propanol (AMP) in an organic solvent, N-methyl-2-pyrrolidone (NMP). The systems have shown promising potential for carbon dioxide removal because of the low regeneration temperatures required (70-90°C), compared to conventional amine solutions, such as aqueous monoethanolamine (MEA). This makes it possible to use low grade heat for the regeneration of the amine solution. In order to evaluate the absorption and desorption behavior of the AMP in NMP system, experiments were performed for two different amine concentrations, 15 and 25 wt% AMP, at absorption and desorption conditions, 40 and 88°C. Experiments with several absorption and desorption cycles in succession were also performed. The results showed that the AMP in NMP would reach higher rich loadings for applications with a higher CO2 partial pressure. However, a very low lean loading can be reached even with a lower regeneration temperature of 88°C. These results indicate that the AMP in NMP system could be suitable for CCS in industry or bio-CCS