CO 2 capture by dry alkanolamines and an efficient microwave regeneration process

Removal of acidic gases such as H 2 S and CO 2 is performed during the purification of raw natural gas, most commonly using amine gas treatment. However, this industrially entrenched method is limited by significant shortcomings including low operational capture efficiency, amine pipeline corrosion and a large energy penalty due to the sorbent regeneration process. To address these shortcomings, we have studied the use of perfluorinated silica-stabilized dry alkanolamines (DA f ) for CO 2 capture. Due to their micronized liquid domains, DA f display high operational CO 2 capture efficiency. Further, to minimize energy requirements for sorbent regeneration, microwave-assisted regeneration of the spent DA f sorbent was also studied and shown to decrease the energy requirements by about ten times. In contrast to very recent work, our results show that the use of DA f exhibits extraordinary recyclability, with a negligible decrease in absorption capacity over at least ten absorption–regeneration cycles, indicating the potential of this material for gas treatment applications.