This
work reviews research activities in the development of phase-change
CO2 capture solvents and processes. The focus is on liquid–liquid
phase-change solvents in which the CO2-lean phase can be
recycled to the absorber prior to regeneration hence the energy demands
may be substantially decreased compared to nonphase change processes.
The review briefly provides the basic chemical and physical principles
required to understand the phase-change behavior in postcombustion
CO2 capture systems. The reviewed work is further organized
per different solvent type into major sections including experimental
property measurement studies, experimental pilot plant studies, thermodynamic
and kinetic modeling studies, as well as process modeling and technoeconomic
assessment studies. In all sections we provide details regarding experimental
approaches, operating conditions of pilot plants, implementations
in different industries, and performance data. Key findings include
operating observations and performance indicators regarding the investigated
solvents and processes as well as a substantiated estimation of their
technology readiness level.