(11b) Low Viscosity Water-Lean Diamine Solvents for Carbon Dioxide Capture

Authors: 
Koech, P. K., Pacific Northwest National Laboratory
Malhotra, D., Pacific Northwest National Laboratory
Nguyen, M., Pacific Northwest National lab
Heldebrant, D. J., Pacific Northwest National Laboratory
Glezakou, V. A., Pacific Northwest National Laboratory
Zheng, F., Pacific Northwest National Laboratory
Rousseau, R., Pacific Northwest National Laboratory
Carbon dioxide capture, storage (CCS), utilization and conversion of large anthropogenic CO2 released from point sources such as coal fired power plants are possibly effective ways to minimize emissions. Toward this goal numerous CO2 capture processes have been developed, the most mature of these technologies utilizes aqueous primary and secondary alkanolamines such as monoethanolamine (MEA) or diethanolamine (DEA) for chemical absorption of CO2. Deployment of these aqueous amine solvents to market is limited by the high regeneration temperature due to the high heat capacity of water. Novel water-lean transformational solvent systems have been developed to address this limitation. We have combined multiple solvent chemistries and key findings from different solvent classes to develop a new class of water-lean diamine solvents with potential to be energy efficient CO2 capture materials. These diamines bind CO2 at standard temperature and pressure (STP) to form liquid carbamate salts with high gravimetric capacity and low viscosity without the need for co-solvents. Herein we will discuss the synthesis, characterization and testing of these novel amine solvents.