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Extractive Distillation

PSE/DISTEXT-E
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Who should attend?

  • This course provides a deeper technical understanding of an extractive distillation column and its principle.
Audience :
  • Anyone involved in the operation of extractive distillation columns (engineers, shift leaders, panel operators, field operators).

Level : Proficiency

Course Content

  • SOLVENT EFFECT ON LIQUID-VAPOR EQUILIBRIA

      • Typical composition of cuts to be treated: C4 and C6 cuts of a steamcracker or other units.
      • Natural volatility of compounds and focus on impurities to be removed, highlighting constraints and treatments available.
      • Action of the solvent and effects on relative volatilities of compounds for separation.
      • Effects of pressure, solvent ratio and feed composition.

  • BEHAVIOR OF AN EXTRACTIVE DISTILLATION COLUMN

      • Feed composition. Qualities required.
      • Mass balance, product recovery ratio, losses of solvent.
      • Analysis of operating parameters: pressure and its control system, solvent ratio, solvent temperature, thermal balance and liquid-vapor traffics.
      • Concentration profile: HC and solvent, behaviors in extractive and non-extractive zones.
      • Meaning of temperatures and of its profile.

  • DOWNSTREAM TREATMENT

      • Solvent recovery system and purification.
      • Make-up of solvent and adjustment of its composition in the solvent loop.
      • Superfractionation if needed.

  • OPERATING VARIABLES OF AN EXTRACTIVE DISTILLATION COLUMN

      • Instrumentation and process control scheme.
      • Meaning of tuned parameters.
      • Modification impact of: solvent ratio, reboiler ratio, solvent temperature and other parameters depending on the process configuration.

  • UPSETS & INCIDENTS

      • Solvent: decrease in flowrate, temperature modification, regeneration trouble and loss of recycling.
      • Feed: unexpected change in flowrate or composition.

Learning Objectives

  • Upon completion of the course, the participants will be able to:
  • know about the action of the solvent,
  • explain the significance of operating parameters,
  • analyze the effect of each parameter acting on the operation of the column and on the qualities of products,
  • counteract the most frequent incidents.

Ways & Means

  • Implementation of static simulation results with C4/ACN and C6/NMP treatment.
  • Working groups to study operating situations that could arise.