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Modelling and optimization of ethane recovery process from natural gas via ZIF-8/water-glycol slurry with low energy consumption

Author

Listed:
  • Zhang, Ruihang
  • Wang, Zexin
  • Wei, Xiaoming
  • Peng, Xiaowan
  • Chen, Wan
  • Deng, Chun
  • Liu, Bei
  • Sun, Changyu
  • Chen, Guangjin

Abstract

Effective recovery of ethane from natural gas plays an increasingly important role as ethane is a good raw material for ethylene production. The conventional cryogenic separation process (CryoPro) is energy intensive. Absorption-adsorption coupling separation process (SorbPro) using ZIF-8 slurry may be a more energy-efficient technique as its operating conditions are milder (i.e., 273.15 K, ∼1 MPa). This paper aims to conduct the process modelling and optimization of SorbPro for CH4/C2H6 separation. The equilibrium stage method is used to model the mass transfer units (absorption-adsorption column, desorber, etc) and the key process operating parameters are optimized simultaneously by genetic algorithm. The results show that the ethane mole fraction can be enriched from 22 mol% in the feed gas to 90.04 mol%, the ethane recovery ratio reaches 90.34%, and the energy consumption per Nm3 ethane is 0.6792 kW h/Nm3, which is 25.6% lower than that of the CryoPro (0.9128 kW h/Nm3). It indicates that the SorbPro may be a more promising approach for recovering ethane from natural gas.

Suggested Citation

  • Zhang, Ruihang & Wang, Zexin & Wei, Xiaoming & Peng, Xiaowan & Chen, Wan & Deng, Chun & Liu, Bei & Sun, Changyu & Chen, Guangjin, 2023. "Modelling and optimization of ethane recovery process from natural gas via ZIF-8/water-glycol slurry with low energy consumption," Energy, Elsevier, vol. 263(PA).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pa:s0360544222025312
    DOI: 10.1016/j.energy.2022.125645
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    References listed on IDEAS

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