Wiped Film Distillation

  • wiped_film_distillation_thc_cbd_short_path_fractional_separation_concentrate_clear_golden_water_terpene
  • Evaporation occurs on the wall of a cylindrical evaporator as the feed product falls down the cylinder wall and is heated above its boiling point by heat applied to the exterior of the cylinder.
  • Excludes the disadvantages of batch-distillation:
    • Lower pressure in the evaporator is possible
    • Reduces the residence time at high temperature, even in large units.

Result: Thermal decomposition is being avoided

Types of Thin Film Evaporators

  • Single Tube Falling Film Evaporator w/external condenser
  • Multiple Tube Falling Film Evaporator w/external condenser
  • Falling Film Degasser (packing) w/external condenser
  • Wiped Film Evaporator w/external condenser
  • Short Path Evaporator w/internal condenser

Thin Film (Wiped Film) Evaporators

thin_film_dhort_path_fractional_distillation_classes_clearclass_terpene_isolate_concentrate_distillate_cbd_thc_highcbd_crystal

  • Residence time:
    less than 1 minute
  • Pressure range:
    down to 1 mbar
  • Not an equilibrium device
  • ~ 1 theoretical plate
  • Condenser is external to Evaporator
  • 30oC rule —

   pressure f( temperature)

 

Falling Film Evaporators

falling_film_evaporators_short_path_distillation_cbd_thc_fractional_clear_class_training_consulting_highcbd

Residence time: several minutes

often with recycling

Pressure range: down to several mbar Not an equilibrium device

~ 1 theoretical stage

Short Path Evaporators
(a subset of Wiped Film Evaporator)

short_path_evaporator_steel_distillation_fraction_terpene_isolate_crystaline_pure_cbd_classes_clear_concentrate

  • Residence time:
    less than 1 minute
  • Pressure range:
    down to 0.001 mbar
  • Not an equilibrium device
  • ~1 theoretical plate
  • Condenser is inside the Evaporator
  • 30oC rule

Wiped Film   vs. Short Path

  • Thin Film Evaporator
    – External condensation
    –  Lowest operation   pressure: ~ 1 mbar
    –  Main application:
    Separation of high   contents of volatiles
  • Short Path Distillator
    – Internal condensation
    –  Lowest operation   pressure: 0.001 mbar
    –  Main application:
    Distillation of heat   sensitive products

 

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