Finding
more efficient gas–liquid scrubbing systems with
lower parasitic energy penalties is important for the future deployment
of carbon capture plants for large point source CO2 emitters.
Minimization of the energy penalty using advanced solvents is one
way to reduce the energy penalty. Nonaqueous, hydrophobic solvents
are one type of solvent in which the physical properties of the solvent
combined with low heats of absorption and low loading at high temperature
even with high CO2 pressure result in promising solvents
with low estimated reboiler heat duty. In this paper, a solvent composed
of a hydrophobic amine (2-fluorophenethylamine) combined with an acidic,
hydrophobic alcohol (octafluoropentanol) is studied mechanistically,
and the experimentally determined reaction products, heats of absorption,
and vapor liquid equilibria are reported. Approximating process models
are compared and indicate the potential to lower reboiler heat duty
in a commercial implementation.
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