2018-07-082018-07-082018-07-08ICES_2018_319http://hdl.handle.net/2346/74256Stephanie Roohi, HX5Oscar Monje, AscentechJay Perry, NASAKevin Lange, Jacobs TechnologyICES302: Physio-chemical Life Support- Air Revitalization Systems -Technology and Process DevelopmentThe 48th International Conference on Environmental Systems was held in Albuquerque, New Mexico, USA on 08 July 2018 through 12 July 2018.This paper describes the initial development of a dynamic model of ammonia removal by chemisorption using Ammonasorb II (Calgon Carbon), a phosphoric-acid-treated activated carbon. The model is being developed using a commercial adsorption modeling software product (Aspen Adsorption™). An adsorption isotherm equation was derived based on aqueous solution chemistry and compared to measured ammonia capacities for Ammonasorb II under wet conditions. Predicted capacities using the measured phosphoric acid content of one carbon and parameters derived from solution chemistry show good agreement with measurements over a range of ammonia concentration. Both solution-phase and solid-phase equilibrium simulations were performed in support of the isotherm development. Using the dynamic model, a preliminary overall linear mass transfer coefficient was estimated by fitting available ammonia breakthrough data. Additional data are needed to more fully describe and validate the dynamic performance behavior. The model development is directed at sizing trace contaminant control beds for low volume applications such as spacesuits and suit loops where dynamic performance is critical.engtrace contaminant controlphosphoric acid impregnated activated carbonammonia removalammonia adsorptiondynamic modelingPresentation