Third generation capture system: precipitating amino acid solvent systems
conference paper
This work summarises the results of the design of novel separation processes for CO2 removal from flue gas based on precipitating amino acid solvents. The processes here described (DECAB, DECAB Plus and pH-swing) use a combination of enhanced CO2 absorption (based on the Le Chatelier’s principle) and / or enhanced CO2 desorption (based on pH-shift), which contribute substantially to the reduction of regeneration energy. An evaluation of these processes has been developed based on literature data, thermodynamic principles and experimental data. As solvent example, the potassium salt of taurine was selected. The results show that these processes are environmentally friendly (no emissions to the air, lower ecotoxicity) and have lower reboiler energy consumption than conventional MEA. The DECAB Plus process has been identified as the option with lower energy consumption (66% of conventional MEA- ie ca 2.4 GJ/t CO2). This study has established the potential of precipitating amino acids as an energy effective alternative to alkanol amines. The future work will focus on determining the cost of CO2 avoidance and investigating other solvents that will further lead to benefits over conventional processes.
TNO Identifier
485327
Source title
2nd Brazilian Congress on CO2 in the Oil, Gas and Biofuels Industries, April 2013, Rio de Janeiro, Brazil
Collation
11 p.
Files
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