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Extractive Distillation

DISTEXT-EN-P
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Who should attend?

  • This course provides a deeper technical understanding of an extractive distillation column, its principle and consequences on the operation of the whole unit.
Public :
  • Anyone involved in the operation/troubleshooting of extractive distillation columns (process/operation engineers, shift leaders, panel operators, field operators).

Level : Proficiency

Course Content

  • SOLVENT EFFECT ON VAPOR-LIQUID EQUILIBRIA

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

  • BEHAVIOR OF AN EXTRACTIVE DISTILLATION COLUMN

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

  • DOWNSTREAM PROCESSES

      • 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 controlled parameters.
      • Impact of the modification of: solvent ratio, reboiler ratio, solvent composition and temperature and other parameters depending on the process configuration. Consequences on the yields, the composition of products and the energy consumption.

  • TROUBLESHOOTING & PROCESS INCIDENTS

      • Solvent: decrease in flowrate, temperature modification, regeneration failure.
      • 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 meaning of the operating parameters,
  • analyze the effect of each parameter acting on the operation of the column and on the specifications of the products,
  • identify the most frequent disturbances and incidents.

Ways & Means

  • The content of this course can be adapted to the customer's needs. The pedagogy is focused on the units concerned, under cover of a secrecy agreement if necessary.
  • Implementation of static simulation results with C4/ACN and C6/NMP processes.
  • The case studies are dealt with in group and based on typical situations encountered in the operation of the related process units.