Post-spinning infusion of poly(ethyleneimine) into polymer/silica hollow fiber sorbents for CO2/N2 gas separation
Ying Labreche1, Ryan P. Lively2, Fateme Rezaei1, Grace Chen1, David S. Sholl1, Christopher W. Jones1,*, William J. Koros1,*
1 Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332-0100, USA
2 Algenol Biofuels, 28100 Bonita Grande Drive, Bonita Springs, Florida 34315, United States
Amine-loaded hollow fiber sorbents for post-combustion CO2recovery were created by utilizing a novel post-spinning infusion technique. This technique infused poly(ethyleneimine) (PEI) into cellulose acetate/mesoporous silica hollow fiber sorbents during the solvent exchange after spinning. A suitable post-spinning infusing solution was found to be 10% PEI in methanol with an infusion time of 4 h.
After amine infusion, the 51 wt% silica hollow fiber sorbents were found to have a nitrogen loading of 0.52 mmol/g-fiber and a CO2 uptake of 1.2 mmol/g-fiber at equilibrium. The amine-loaded fibers were formed into a shell-and-tube module and exposed on the shell side at 1 atm and 35 °C to simulated flue gas with an inert tracer (10 mol% CO2, 80 mol% N2 and 10 mol% He at 100% R.H.). The fibers were found to have a breakthrough CO2 capacity of 0.58 mmol/g-fiber, with a mass transfer propagation front velocity of 1.12 cm/s. The CO2 “equilibrium” uptake at 1 atm and 35 °C is 0.92 mmol/g-fiber. The sorption enthalpy release was monitored and the thermal front propagation velocity was 0.75 cm/s. Finally, the water uptake was found to be 3.2 mmol/g-fiber. The results indicate the post-spinning infusion method provides a new platform for ultimate scale-up of practical fiber sorbents for flue gas application.
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