Polybloc®, impervious graphite block heat exchanger


Poybloc® graphite block heat exchangers are adapted to the heating, cooling, evaporation, condensation and absorption of highly corrosive liquid chemicals.

This design is one of the most versatile type of impervious graphite heat exchangers.

Rows of holes are drilled through graphite blocks both horizontally and vertically to form the process and service channels. Heat is transferred by conduction through the impervious graphite left between the rows of holes which separate the mediums being used. Graphite block heat exchangers consist in a stack of blocks encapsulated in a steel shell.

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Polybloc® features

  • Graphilor® isostatic or extruded graphite grades
  • Heat transfer area up to 1000 m2
  • Various block diameters: from Ø100 to 1500 mm
  • Design pressure
    • Full vacuum to 7 barg on both process and service sides as standard
    • Up to 16 barg on service and up to 12 barg on process side on request
  • Design temperature: from 200°C (BS), maximum 430°C (XC)
  • Various drilling diameters and patterns
  • Number of passes on process and service sides can be adjusted to achieve optimum velocities
  • Number of blocks can be adjusted to achieve the necessary heat transfer area


  • Gas / Liquid Separation Chamber
  • Header with Liquid Distribution for Falling Film Absorber
  • Protection against erosion
  • Dismountable Headers for easy



Polybloc® advantages

  • Versatile, modular, and simple design
  • Easy maintenance
  • Wide choice of graphite and impregnation types
  • Individual blocks can be replaced (no catastrophic failure


Polybloc® applications

  • Heating, Cooling, Condensation, Evaporation (falling film or forced circulation), Absorption
  • Heavy Chemistry: Phosphoric Acid, Titanium Dioxide, Hydrometallurgy, Vinyl Chloride Monomer, Epichlorohydrin, Plastics, Viscose, Aramid fiber, and many more…
  • Fine Chemistry, Specialty Chemistry, Pharmacy: Active Pharmaceutical Ingredient, Crop Protection, Fumed Silica, Silicones, Flavors and Fragrances, Vitamins, and many more…
  • Carbon and Stainless-Steel Pickling