Efficient Regeneration of Physical and Chemical Solvents for CO2 Capture
Project No.: DE-FE0002196
NETL has partnered with the University of North Dakota to conduct research and training in evaluating the use of composite polymer membranes and porous membranes to recover CO2 from CO2-rich streams from pre-combustion coal gasification synthesis gas (syngas). In gasification combustion, fuel is converted into gaseous components by applying heat under pressure in the presence of steam. CO2 can be captured from the syngas that emerges from the coal gasification reactor before it is mixed with air in a combustion turbine. Here the CO2 is relatively concentrated and at a high pressure. Candidate membranes and solvent combinations are being tested in batch and continuous laboratory scale experiments using mixtures of CO2 and hydrogen (H2) to determine the rate of CO2 removal and solvent regeneration as a function of temperature, initial reservoir pressure, and permeate pressure (Figure 1).
The overall objective of the project is to utilize graduate and undergraduate students to determine the feasibility of using asymmetric polymer membranes and porous membrane contactors for the recovery of CO2 from CO2-rich solvent streams in which the solvent is used to absorb CO2 from gasification syngas. These membrane systems have the potential to eliminate or reduce the thermal and/or pressure cycling requirements of traditional solvent regeneration systems because they facilitate CO2 transport out of the solvent by increasing the interfacial contact area for mass transfer. This should reduce the cost of CO2 capture by increasing the energy efficiency of the solvent regeneration process.
|Figure 1: Membrane types that will be investigated in this study.