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A research grade gas cylinder from Airgas® simulates the impure feed mixture (80% He-10% N2-10% CO2); while a research grade pure He cylinder is used as the purge gas, which desorbs CO2 out of the adsorbent and regenerates the microchannel. The N2 in the feed stream is selected as a tracer gas, which exits the microchannel after insignificant interaction with the adsorbent. The difference in time between when CO2 exits the microchannel and when N2 exits is deemed to be the useful adsorption time and is monitored for all experiments. For switching between the feed gas stream and the purge gas stream, a solenoid-controlled, pneumatically actuated T-valve (MAC Valves Inc., external pilot, Pressure range: 170 – 1020 kPa) is used. This T-valve has a measured actuation time of 38 ms and ensures rapid switching of the gas streams, in addition to communicating the time instant at which switching occurs. The analog outputs from each of these instruments are monitored using a National Instruments SCXI-1000 data acquisition system via a 32-channel SCXI-1102 card module and an SCXI-1303 terminal block. Solenoid valve operation is controlled by the same data acquisition system using an SCXI-1161 power relay switch module. The SCXI-1000 system is connected via USB to a computer running a LabVIEW VI, which is responsible for synchronization of the data. A fraction of the gas reaching the microchannel outlet is fed to a Hiden HPR-20 transient mass spectrometer with a temporal resolution of 0.05 s to monitor the gas composition. The signal from the mass spectrometer is synchronized via an Ethernet cable with the same LabVIEW VI. The experimental procedure consists of sequential flow of impure feed gas and purge gas. Impure gas flow is continued for 40 s, although it takes lesser time for CO2 in the feed stream to saturate the entire adsorbent layer for all the experiments. Following 105PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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