Evaluating the Performance of Micro-Encapsulated CO2 Sorbents during CO2 Absorption and Regeneration Cycling

• DOI: 10.1021/acs.est.8b06442
• Publication Date: 2019-02-13T20:26:10Z
• Authors: Jennifer M. Knipe; Kathya P. Chavez; Katherine M. Horn...; Matthew A. Worthi...; Du T. Nguyen; Congwang Ye; William L. Bourcier; Sarah E. Baker; Joan F. Brennecke; Joshuah K. Stolaroff
• Keywords: Stripping (fiber)

We encapsulated six solvents with novel physical and chemical properties for CO2 sorption within gas-permeable polymer shells, creating Micro-Encapsulated Sorbents (MECS), to improve the absorption kinetics handling of postcombustion capture from flue gas. The were sodium carbonate (Na2CO3) solution, uncatalyzed two different promoters, ionic liquid (IL) solvents, one CO2-binding organic (CO2BOL). subjected each MECS multiple regeneration cycles measured working capacity as a function time identify promising candidate large-scale carbon capture. discovered that Na2CO3 Na2CO3-sarcosine had lower rates relative Na2CO3-cyclen over 30 min absorption, while CO2BOL Koechanol appeared permeate through capsule shell is thus unsuitable. rigorously tested most three (Na2CO3-cyclen, IL NDIL0309, NDIL0230) by subjecting them series 10 absorption/stripping cycles. curves highly reproducible these across cycles, demonstrating successful absorption/regeneration without degradation. As rate dynamic in loading per mass varies among MECS, process design parameters will ultimately dictate selection solvent.