(71f) A Novel CO2 Absorption Process Enabled By Dedicated Biphasic Solvents: Solvent Screening and Process Development
AIChE Annual Meeting
Monday, November 14, 2016 - 9:45am to 10:06am
We are presently developing a novel absorption process enabled by a dedicated new class of biphasic solvents to further improve the performance of biphasic absorption processes by maximizing absorption kinetics and minimizing the concern of high solvent viscosity associated with high CO2 loading. Totally 34 solvent blends have been formulated and experimentally screened with respect to phase transition behavior, absorption kinetics, and vapor-liquid equilibrium performance. Preliminary results revealed that the phase transition, in terms of its dependence on CO2 loading and volumetric distribution between two phases, could be tuned with selection of solvent components or composition. The solvents could be formulated to have faster absorption rates than that of the benchmark 5M monoethanolamine (MEA) aqueous solution. The loading capacities of the solvents for CO2 stripping were 40 to 250% higher than 5M MEA and the stripping pressures generally ranged between 5 and 10 bar under the regenerated lean solution conditions at 120 °C.
In this presentation, an overview of the novel biphasic absorption process will be provided, the preliminary results of the biphasic solvent screening study will be updated, and their indications to the process techno-economic performance will be discussed.