Hans Thomann - Academia.edu (original) (raw)
Uploads
Papers by Hans Thomann
J. Chem. Soc., Chem. Commun., 1989
Journal of the American Chemical Society, 1987
Journal of the American Chemical Society, 1987
Near Surface Geophysics, 2015
Symposium on the Application of Geophysics to Engineering and Environmental Problems 2015, 2015
Methods in Enzymology, 1993
International Journal of Greenhouse Gas Control, 2012
We describe here the CO 2 sorption and desorption properties of hollow fiber sorbents-a polymer/z... more We describe here the CO 2 sorption and desorption properties of hollow fiber sorbents-a polymer/zeolite hybrid sorbent that possesses a coated bore that allows for exceedingly fast heat transfer between the heat transfer fluid and the sorbent. The fiber sorbents are intended for use in post-combustion CO 2 . The fiber sorption properties are tested chromatographically with simulated flue gas in the absence of a heat transfer fluid and are found via in situ thermal measurements to be highly non-isothermal, which results in up to 40% losses in CO 2 breakthrough capacities. The thermal front moving through the fiber wall was found to progress approximately 30% faster than the propagating speed of the CO 2 sorption front. Upon the addition of a heat transfer fluid (water) in the bores of the fibers, breakthrough CO 2 capacities were maintained at all flue gas superficial velocities studied (up to 50 cm/s). The propagation speed of the CO 2 front was reduced by 38% by the addition of cooling water in the bores, and the in situ thermal measurements revealed that the fiber sorbents were nearly isothermal during the CO 2 sorption step. One of the main conceptual advantages of a fiber sorbent CO 2 capture platform is the ability to transfer the released sorption enthalpy to the bore-side cooling water, which can then be later used in a beneficial way. By varying the cooling water velocity, in situ thermal measurements showed that 22,000 J per mol of flowing CO 2 could be transferred to the cooling water out of a possible 36,000 J per mol. Finally, plug flow-mode desorption experiments were performed, and a 40.5 mol% CO 2 product was obtained. The small scales of the system prohibit sharper thermal fronts, which likely causes unwanted product CO 2 and interstitial N 2 mixing.
J. Chem. Soc., Chem. Commun., 1989
Journal of the American Chemical Society, 1987
Journal of the American Chemical Society, 1987
Near Surface Geophysics, 2015
Symposium on the Application of Geophysics to Engineering and Environmental Problems 2015, 2015
Methods in Enzymology, 1993
International Journal of Greenhouse Gas Control, 2012
We describe here the CO 2 sorption and desorption properties of hollow fiber sorbents-a polymer/z... more We describe here the CO 2 sorption and desorption properties of hollow fiber sorbents-a polymer/zeolite hybrid sorbent that possesses a coated bore that allows for exceedingly fast heat transfer between the heat transfer fluid and the sorbent. The fiber sorbents are intended for use in post-combustion CO 2 . The fiber sorption properties are tested chromatographically with simulated flue gas in the absence of a heat transfer fluid and are found via in situ thermal measurements to be highly non-isothermal, which results in up to 40% losses in CO 2 breakthrough capacities. The thermal front moving through the fiber wall was found to progress approximately 30% faster than the propagating speed of the CO 2 sorption front. Upon the addition of a heat transfer fluid (water) in the bores of the fibers, breakthrough CO 2 capacities were maintained at all flue gas superficial velocities studied (up to 50 cm/s). The propagation speed of the CO 2 front was reduced by 38% by the addition of cooling water in the bores, and the in situ thermal measurements revealed that the fiber sorbents were nearly isothermal during the CO 2 sorption step. One of the main conceptual advantages of a fiber sorbent CO 2 capture platform is the ability to transfer the released sorption enthalpy to the bore-side cooling water, which can then be later used in a beneficial way. By varying the cooling water velocity, in situ thermal measurements showed that 22,000 J per mol of flowing CO 2 could be transferred to the cooling water out of a possible 36,000 J per mol. Finally, plug flow-mode desorption experiments were performed, and a 40.5 mol% CO 2 product was obtained. The small scales of the system prohibit sharper thermal fronts, which likely causes unwanted product CO 2 and interstitial N 2 mixing.