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High Purity/Recovery Separation of Propylene from Propyne Using Anion Pillared Metal-Organic Framework: Application of Vacuum Swing Adsorption (VSA)

Author

Listed:
  • Majeda Khraisheh

    (Department of Chemical Engineering, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar)

  • Fares AlMomani

    (Department of Chemical Engineering, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar)

  • Gavin Walker

    (Department of Chemical Sciences, SSPC, Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland)

Abstract

Propylene is one of the world’s most important basic olefin raw material used in the production of a vast array of polymers and other chemicals. The need for high purity grade of propylene is essential and traditionally achieved by the very energy-intensive cryogenic separation. In this study, a pillared inorganic anion SIF 6 2− was used as a highly selective C 3 H 4 due to the square grid pyrazine-based structure. Single gas adsorption revealed a very high C 3 H 4 uptake value (3.32, 3.12, 2.97 and 2.43 mmol·g −1 at 300, 320, 340 and 360 K, respectively). The values for propylene for the same temperatures were 2.73, 2.64, 2.31 and 1.84 mmol·g −1 , respectively. Experimental results were obtained for the two gases fitted using Langmuir and Toth models. The former had a varied degree of representation of the system with a better presentation of the adsorption of the propylene compared to the propyne system. The Toth model regression offered a better fit of the experimental data over the entire range of pressures. The representation and fitting of the models are important to estimate the energy in the form of the isosteric heats of adsorption (Q st ), which were found to be 45 and 30 kJ·Kmol −1 for propyne and propylene, respectively. A Higher Q st value reveals strong interactions between the solid and the gas. The dynamic breakthrough for binary mixtures of C 3 H 4 /C 3 H 6 (30:70 v / v )) were established. Heavier propylene molecules were eluted first from the column compared to the lighter propyne. Vacuum swing adsorption was best suited for the application of strongly bound materials in adsorbents. A six-step cycle was used for the recovery of high purity C 3 H 4 and C 3 H 6 . The VSA system was tested with respect to changing blowdown time and purge time as well as energy requirements. It was found that the increase in purge time had an appositive effect on C 3 H 6 recovery but reduced productivity and recovery. Accordingly, under the experimental conditions used in this study for VSA, the purge time of 600 s was considered a suitable trade-off time for purging. Recovery up to 99%, purity of 98.5% were achieved at a purge time of 600 s. Maximum achieved purity and recovery were 97.4% and 98.5% at 100 s blowdown time. Energy and power consumption varied between 63–70 kWh/ton at the range of purge and blowdown time used. The VSA offers a trade-off and cost-effective technology for the recovery and separation of olefins and paraffin at low pressure and high purity.

Suggested Citation

  • Majeda Khraisheh & Fares AlMomani & Gavin Walker, 2021. "High Purity/Recovery Separation of Propylene from Propyne Using Anion Pillared Metal-Organic Framework: Application of Vacuum Swing Adsorption (VSA)," Energies, MDPI, vol. 14(3), pages 1-19, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:609-:d:486858
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    References listed on IDEAS

    as
    1. Qasem, Naef A.A. & Ben-Mansour, Rached, 2018. "Adsorption breakthrough and cycling stability of carbon dioxide separation from CO2/N2/H2O mixture under ambient conditions using 13X and Mg-MOF-74," Applied Energy, Elsevier, vol. 230(C), pages 1093-1107.
    2. Hedin, Niklas & Andersson, Linnéa & Bergström, Lennart & Yan, Jinyue, 2013. "Adsorbents for the post-combustion capture of CO2 using rapid temperature swing or vacuum swing adsorption," Applied Energy, Elsevier, vol. 104(C), pages 418-433.
    3. Qasem, Naef A.A. & Ben-Mansour, Rached & Habib, Mohamed A., 2018. "An efficient CO2 adsorptive storage using MOF-5 and MOF-177," Applied Energy, Elsevier, vol. 210(C), pages 317-326.
    4. Qasem, Naef A.A. & Ben-Mansour, Rached, 2018. "Energy and productivity efficient vacuum pressure swing adsorption process to separate CO2 from CO2/N2 mixture using Mg-MOF-74: A CFD simulation," Applied Energy, Elsevier, vol. 209(C), pages 190-202.
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