Browsing by Author "Rahislic, Emir"
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Item Carbon Dioxide Removal by Ionic Liquid System (CDRILS): Ground Prototype Testing and Trace Contaminant Removal Integration(2023 International Conference on Environmental Systems, 2023-07-16) Kamire, Rebecca; Yates, Stephen F.; Rahislic, Emir; Triezenberg, Mark; Henson, Phoebe; Ford, Jack; Pipitone, Meghan; Pope, Eric; Gressly, Nathaniel; Kayatin, Matthew J.The Carbon Dioxide Removal by Ionic Liquid System (CDRILS) utilizes a continuously recirculated ionic liquid sorbent and hollow fiber membrane contactors for carbon dioxide removal from air. The CDRILS ground prototype was operated under varied process conditions to optimize performance and meet a 4-crew scale carbon dioxide removal rate of 4.16 kg/day at a carbon dioxide partial pressure of 2 mm Hg. Humidity and thermal management at scale, ongoing durability trials, and tests of updated components are key demonstrations that inform refined designs of the upcoming CDRILS flight demonstration unit. In addition, CDRILS has demonstrated trace contaminant removal from simulant cabin air without impact on the CDRILS carbon dioxide removal performance. Removal of trace contaminants from cabin air reduces the contaminant load within the cabin. Benefits to other systems that interface with the cabin air are also achieved. However, trace contaminant removal by CDRILS results in contaminant delivery to the CDRILS carbon dioxide and water condensate product streams, which may in turn be delivered to a Sabatier reactor or Water Processor Assembly. The relative partitioning of the contaminants between the two streams and impacts on downstream systems are evaluated.Item Carbon Dioxide Removal by Ionic Liquid System (CDRILS): Impacts of Trace Contaminants and Ground Prototype Testing(51st International Conference on Environmental Systems, 7/10/2022) Kamire, Rebecca; Henson, Phoebe; Yates, Stephen F.; Rahislic, Emir; Triezenberg, Mark; Dotson, Breydan; Skomurski, Sean; Ford, Jack; Pope, Eric; Pedersen, KristenThe Carbon Dioxide Removal by Ionic Liquid System (CDRILS) utilizes a continuously recirculated ionic liquid sorbent and hollow fiber membrane contactors for carbon dioxide removal from air. Endurance testing under realistic operating conditions and at realistic scale are critical for demonstration of the feasibility of the technology for revitalization of cabin air in human space missions. CDRILS has undergone challenge testing with trace contaminants and demonstration testing at full-scale on a ground prototype. Common contaminants present in the cabin air of ISS were divided into four groups based on chemical similarity and fed in simulant cabin air at varied concentration to the CDRILS scrubber or dissolved directly into the CDRILS liquid sorbent. The degree of capture and release of the contaminants, as well as the ability of CDRILS to withstand the chemical stressors, were evaluated. No decrease in carbon dioxide removal rate due to any of the contaminants was identified. In addition, the liquid sorbent was aged under simulated operating conditions for further evaluation of system durability. The full-scale CDRILS ground prototype was commissioned and operated as a demonstration of scale, validation of system modeling, and further evaluation of system durability.Item CDRILS Durability Upgrades and 4-crew-scale CO2 Removal Testing(2024 International Conference on Environmnetal Systems, 2024-07-21) Kamire, Rebecca; Yates, Stephen F.; Triezenberg, Mark; Rahislic, Emir; Gray, David; Henson, Phoebe; Pipitone, Meghan; Gressly, NathanielThe Carbon Dioxide Removal by Ionic Liquid System (CDRILS) utilizes a continuously recirculated ionic liquid sorbent and hollow fiber membrane contactors for carbon dioxide removal from air. The CDRILS 4-crew scale ground prototype and smaller-scale CDRILS breadboard demonstrations underwent extended durability trials during which previously reported aging effects were rigorously quantified. Membrane, sorbent, and system configuration upgrades have demonstrated benefits to long-term system durability compared to the baseline aging rate. Flight-scale membrane contactors have demonstrated 4-crew scale CO2 removal and have replaced the previously used developmental small-diameter contactors in parallel toward flight readiness. These upgraded materials and configurations are being incorporated into the 4-crew scale CDRILS flight demonstration unit design.