Carbon dioxide emissions from electricity production and other industrial processes account for the largest contribution towards greenhouse gas emission in United States. Capture, storage and utilization of CO2 from flue gas are possibly effective ways of alleviating adverse environmental effects. Numerous CO2 capture processes have been developed including aqueous amines such as MEA or diethanolamine (DEA). However, the energy requirements are prohibitively high due to the energy requirements associated with boiling and condensing of water. Several water lean solvents system has been developed to address these energy penalties. These technologies include nano-material organic hybrids (NOHMs), task-specific, protic and reversible ionic liquids, phase change solvents and CO2 binding organic liquids (CO2BOLs). As part of our ongoing study, a new energetically efficient water-lean amine-based solvent system has been identified and tested in our group. These solvent molecules were designed to possess high degree of internal hydrogen bonding which was identified a critical factor towards reducing the viscosity in our CO2 binding organic liquid (CO2BOLs) systems. They formed liquid carbamates and exhibited high gravimetric CO2 capacity (17-20 wt%). The CO2-rich solvent viscosities were found to be ~300 cP and they displayed low regeneration temperatures (70-100°C) which means lower grade heat can be utilized for regeneration. This solvent class exhibited excellent recyclability over multiple CO2 absorption and regeneration cycles but suffered from volatility issues. We are preforming structure activity relationship to design molecules with reduced volatility while retaining the low viscosity. Synthesis, characterization and performance of the newly developed non-volatile class of non-aqueous amine based solvents with high CO2 capture capacity will be presented.

Non-aqueous amine-based solvents as carbon dioxide capture materials

256th National Meeting (2018)

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