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Extractive Distillation

  • Anyone involved in the operation of ED columns (engineers, shift leaders, panel operators, field operators).
  • To deepen technical understanding of an ED column and its principle.
Learning Objectives
  • To know about the action of the solvent.
  • To explain the significance of operating parameters.
  • To analyze the effect of each parameter acting on the operation of the column and on the qualities of products.
  • To counteract the most frequent incidents.
Ways and means
  • Implementation of static simulation results with C4/ACN and C6/NMP treatment.
  • Working groups to study operating situations that could arise.

Solvent effect on liquid-vapor equilibria 0.75 day
  • 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 0.75 day
  • 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 0.5 day
  • 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 0.5 day
  • 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 and incidents 0.5 day
  • Solvent: decrease in flowrate, temperature modification, regeneration trouble and loss of recycling.
  • Feed: unexpected change in flowrate or composition.