Main benefits
  • Mellapak and MellapakPlus show a significantly lower pressure drop compared to conventional structured packings
  • MellapakPlus for new columns leads to a smaller column diameter
  • MellapakPlus for existing columns results in a higher capacity at the same efficiency
  • MellapakPlus has up to 50% higher capacity at the same number of theoretical stages per meter compared to conventional Mellapak
Main applications
  • Chemical industry: ethyl benzene/styrene, tall oil, cyclohexonone/cyclohexanol, air separation
  • Petrochemical industry: quench columns, C3- and C4- splitters, xylene splitters
  • Refineries: vacuum and atmospheric columns
  • Absorption: natural gas drying, CO2 and H2S absorbers and strippers, ethylene oxide absorbers and strippers, acrylonitrile absorbers
  • MellapakPlus™ can be used from low vacuum from 1 mbar to high pressure applications 


  • Universal packing type
  • Suitable for a wide range of applications from low to very high liquid loads, from vacuum to moderate pressure for distillation and to high pressure for absorption and desorption systems
  • Available in a wide range of stainless steel types, alloys, and thermoplastics

Key characteristics

  • Pressure drop per theoretical stage 0.3 - 1.0 mbar
  • Pressure drop at 70-80% flooding about 2 mbar/m
  • Minimum liquid load approximately 0.2 m3/m2h
  • Maximum liquid load up to more than 200 m3/m2h (typically in desorption columns)

Preferred applications

  • Vacuum to moderate pressure
  • High pressure for selected applications
  • Increasing capacity of existing tray and packed column
MellapakPlus™ geometry in detail


The new style of packing incorporates a patented modification to the lower and upper end of each packing element. The corrugation angle in relation to the vertical is gradually reduced to zero at both ends of each sheet (see picture). This design modification of the corrugation angle causes a smooth and steady change of flow direction; it is no longer abrupt as with Mellapak™. The result is a reduction in pressure drop and in the shear force between the gas and liquid phase, and a reduction of gas velocity.

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