EPDC/C Évaporateur à Film Descendant, Contrôlé par Ordinateur (PC)



The Computer Controlled Falling Film Evaporator, "EPDC/C", designed by EDIBON, allows to observe and control the operating processes of a falling film evaporator. It allows the monitoring of all the variables for a complete study of the process according to the working conditions and to investigate the effects of the variation of process parameters such as: vacuum, temperature, flow, etc. in the falling film evaporation.

Voir description générale


Description Générale

The objective of the evaporation is to concentrate a non-volatile solute, carrying out the elimination of a volatile compound.

Water is the volatile compound used in most evaporations.

The rising or falling film evaporators are very useful if high temperatures can degrade the product that we want to concentrate, so these evaporators work at less temperature. They can be used, for example, for the concentration of fruit juices, milk and dairy products, effluents, etc.

Basically, the unit consists of the following circuits:

The feed circuit that consists on a feed pump that introduces the product in a double jacket column, which has temperature sensors. The feed is done through the top of the column, where a joint with a pressure sensor has been assembled. The concentrated product leaves the tank through a cyclone placed at the bottom of the column and it is collected in a 500 ml

graduated vessel. This vessel is also connected to a 10 liters tank for the storage of the concentrated product.

The distillation circuit starts at the bottom of the column. It is also connected to the cyclone to separate the concentrated product and the distilled product. This last one goes through a Liebing West condenser. The distilled product is stored in a 500 ml graduated vessel that is connected to a 10-liter collection tank.

The steam circuit, introduced in the external jacket of the column, contains a pressure sensor for the control of the steam pressure. This sensor is connected to a high-pressure cutout control that opens or closes a control electrovalve for the steam inlet.

The vacuum circuit consists on a vacuum pump and a vacuum trap.

This Computer Controlled Unit is supplied with the EDIBON Computer Control System (SCADA), and includes: The unit itself + a Control Interface Box + a Data Acquisition Board + Computer Control and Data Acquisition Software Packages, for controlling the process and all parameters involved in the process.

Des exercices et pratiques guidées


  1. Determination of the capacity of the evaporator.
  2. Study of the capacity of the evaporator in function of the work conditions.
  3. Study of the relation between condensed and evaporated product.
  4. Verification of the global mass balance of the system.
  5. Study of the mass balance for the solute.
  6. Verification of the mass balance for the water.
  7. Determination of the concentration of a sugar solution.
  8. Calculation of the enthalpy of the volatile vapours.
  9. Calculation of the mass of steam used by means of an energy balance calculation.
  10. Determination of the economy of the evaporator.
  11. Determination of the efficiency of the steam generator.
  12. Investigation of the effects of varying the process parameters such as: vacuum, flow rate, temperature, etc.
  13. Concentration of fruit juices and vegetable extracts.
  14. Obtaining concentrated milk.


  1. 15.-Sensors calibration.

Other possibilities to be done with this Unit:

  1. Many students view results simultaneously. To view all results in real time in the classroom by means of a projector or an electronic whiteboard.
  2. Open Control, Multicontrol and Real Time Control. This unit allows intrinsically and/or extrinsically to change the span, gains, proportional, integral, derivative parameters, etc, in real time.
  3. The Computer Control System with SCADA and PID Control allow a real industrial simulation.
  4. This unit is totally safe as uses mechanical, electrical/electronic, and software safety devices.
  5. This unit can be used for doing applied research.
  6. This unit can be used for giving training courses to Industries even to other Technical Education Institutions.
  7. Control of the EPDC/C unit process through the control interface box without the computer.
  8. Visualization of all the sensors values used in the EPDC/C unit process.
  9. By using PLC-PI additional 19 more exercises can be done.
  10. Several other exercises can be done and designed by the user.




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