Reducing The Cost of CO2 Capture From Flue Gases Using Phase-change Solvent Absorption

There has been increasing interest in the development of alternative solvents for CO2 capture, including solvents that involve precipitation during CO2 absorption. Based on the precipitating species, there are two classes of phase- change solvents. One of the benefits of using phase-change solvents is the opportunity to use low grade heat (around 80 °C or higher) for precipitate dissolution. The objective of this paper is to carry out a cost-benefit analysis of phase-change solvents for CO2 capture. For each phase-change solvent class, multiple levels of heat integration are considered and their impact on total heat duty is quantified.