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Absorption degree analysis on biogas separation with ionic liquid systems.

Xin Zhang1, Suojiang Zhang2, Di Bao1

  • 1Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.

Bioresource Technology
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces "absorption degree" to evaluate biogas upgrading, combining thermodynamics and mass transfer. IL-NHD mixtures show high CO2 selectivity and fast absorption, with a 50wt% [bmim][NO3]+50wt% NHD blend recommended.

Keywords:
Absorption degreeBiogasIonic liquidsMass transferThermodynamics

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Area of Science:

  • Chemical Engineering
  • Separation Science

Background:

  • Biogas upgrading requires efficient separation of CO2 and CH4.
  • Existing studies often focus on either thermodynamics or mass transfer, not both.

Purpose of the Study:

  • To propose a new comprehensive evaluation criterion for biogas absorption performance.
  • To investigate the absorption characteristics of ionic liquid-polyethylene glycol dimethyl ether mixtures for biogas upgrading.

Main Methods:

  • Investigated Henry's law constants for CO2 and CH4 in IL-NHD mixtures.
  • Determined liquid-side mass transfer coefficients (kL).
  • Proposed and calculated a new 'absorption degree' criterion.

Main Results:

  • IL-NHD mixtures demonstrated high CO2/CH4 selectivity and fast CO2 mass transfer (kL).
  • The [bmim][NO3]+NHD mixtures showed high CO2 absorption degree but low CH4 absorption degree.
  • The 50wt% [bmim][NO3]+50wt% NHD mixture achieved the highest relative absorption degree.

Conclusions:

  • The 'absorption degree' criterion effectively combines thermodynamic and mass transfer properties for evaluating biogas upgrading.
  • Ionic liquid-NHD mixtures are promising for efficient biogas separation.
  • A specific mixture composition is recommended for optimal biogas upgrading performance.