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Modeling the Adsorption of Mixed-Gases Based on Pure Gas Adsorption Properties

Modeling the Adsorption of Mixed-Gases Based on Pure Gas Adsorption Properties. Nir Tzabar, Harry J. Holland, Cris H. Vermeer, Marcel H.J. ter Brake. Energy, Materials and Systems Faculty of Science and Technology University of Twente Enschede, Netherlands. Outline. Motivation

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Modeling the Adsorption of Mixed-Gases Based on Pure Gas Adsorption Properties

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  1. Modeling the Adsorption of Mixed-Gases Based on Pure Gas Adsorption Properties Nir Tzabar, Harry J. Holland, Cris H. Vermeer, Marcel H.J. ter Brake Energy, Materials and Systems Faculty of Science and Technology University of Twente Enschede, Netherlands

  2. Outline • Motivation • Pure gas adsorption measurements • Sips isotherms • Mixed gas adsorption calculations • Summary CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  3. 1. Motivation • Joule-Thomson (JT) sorption cryocoolers have no moving parts; therefore, are free of vibrations and have potentially a long lifetime. • Mixed-Regrigerants allows lower operating pressures for JT cryocoolers (relative to pure gases) and higher COPs. • This study is a step in a research on mixed-refrigerant JT sorption cryocooling Developinganeffective model todetermine the adsorption of mixed gases out of pure gas adsorptionisothermsfor the research on JT sorptioncryocoolers CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  4. Connecting Tube V1 Pi V2 V3 T P Sorption Cell Heater Coriolis Flow Controller Gas Source N2 / CH4 / C2H6 / C3H8 V 2. Pure gas adsorption measurements Vacuum Pump Experimental setup Norit-RB2 Activated carbon, steam activated, extruded carbon. CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  5. 2. Pure gas adsorption measurements Experimental results Nitrogen Methane Ethane Propane 300 K 320 K 340 K 360 K 380 K 400 K CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  6. 3. Sips Isotherms C – adsorption concentration p – pressure C0– the saturated adsorption concentration a – the adsorption affinity n – adsorption heterogeneity parameter CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  7. 3. Sips Isotherms Linearization: CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  8. 3. Sips Isotherms CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  9. 3. Sips Isotherms Symbols – Experimental results Solid lines – Sips model 300 K 320 K 340 K 360 K 380 K 400 K CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  10. 3. Sips Isotherms Modified Sips model CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  11. 3. Sips Isotherms Symbols – Experimental results Dashed lines – Modified Sips model Modified Sips model CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  12. 3. Sips Isotherms CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  13. 4. Mixed gas adsorption calculations The composition of the adsorbed phase: The adsorption selectivity: CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  14. 4. Mixed gas adsorption calculations Nitrogen - Propane Nitrogen - Ethane Nitrogen - Methane 300 K 300 K 300 K i j x – molar fraction in the adsorbed phase y – molar fraction in the vapor phase = 0.22 @ 10 bar CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  15. 5. Summary • The adsorption of nitrogen, methane, ethane, and propane on Norit-RB2 activated carbon have been measured. • The Sips adsorption model is used to describe the adsorption isotherms, and a linearization method is used to determine the parameters out of the experimental results. • A modified Sips model that incorporates the temperature dependence is suggested. • The adsorption model is further developed for the adsorption of gas mixtures. • The adsorption selectivity is discussed and the results of nitrogen-methane, nitrogen-ethane, and nitrogen-propane are presented. • Future work: • Pure gas adsorption measurements on other adsorbents • Experimental verification of the mixed gases adsorption model • Using the modified Sips model in a sorption compressor analysis CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

  16. Thank you for your attention CEC-ICMC, Tucson AZ, Nir Tzabar, July 2015

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