sentences:  Low eluent consumption
  High product concentration
  High productivity
  Continuous process
  This system is useful in the supercritical fluid extraction to obtain large quantity of specific product.The drawbacks of the SMB are higher investment cost compared to single column operations, a higher complexity, as well as higher maintenance costs.But these drawbacks are effectively compensated by the better yield and a much lower solvent consumption as well as a much higher productivity compared to simple batch separations.