High-energy density storage of natural gas in light Hydrocarbon solutions

Authors

  • S. W. Horstkamp,

    1. The Institute for Gas Processing and Utilization Technologies, School of Chemical Engineering and Materials Science, The University of Oklahoma, Norman, OK 73109
    Search for more papers by this author
  • K. E. Starling,

    1. The Institute for Gas Processing and Utilization Technologies, School of Chemical Engineering and Materials Science, The University of Oklahoma, Norman, OK 73109
    Search for more papers by this author
  • J. H. Harwell,

    1. The Institute for Gas Processing and Utilization Technologies, School of Chemical Engineering and Materials Science, The University of Oklahoma, Norman, OK 73109
    Search for more papers by this author
  • R. G. Mallinson

    1. The Institute for Gas Processing and Utilization Technologies, School of Chemical Engineering and Materials Science, The University of Oklahoma, Norman, OK 73109
    Search for more papers by this author

Abstract

The storage of natural gas in other light hydrocarbons is one procedure for automotive natural gas usage that reduces the requirement of high-pressure or cryogenic storage. Model solutions of methane in n-butane, propane, and a liquefied-bottled-gas mixture were simulated using the Benedict-Webb-Rubin-Starling equation of state to determine the pressures necessary to maintain a liquid phase with perturbations in both temperature (−1°C to 38°C) and mole fraction (50 to 80 mol% methane). Methane storage in these liquid solutions is between 45 and 93% of an equal “tank” volume of compressed natural gas (CNG) at 21 MPa and 15°C. The simulation results indicate that solutions of this type contain 40 to 67% of the energy of gasoline at pressures that range from 60 to 40% that of CNG at 21 MPa and 15°C.

Ancillary