Cracking & Chemical Treatments of Purification


Who should attend?

  • This course brings technical information on the steamcracker sections focused on chemical transformations: feed cracking, cracked gas purification, hydrogenations or purification stages on a solid (drying).
Public :
  • Operating personnel in steamcracking plants: experienced filed operators, panel operators, shift leaders and all technicians involved in the operation of these sections.

Level : Proficiency

Course Content


      • Roles of the various sections.
      • Feedstock origins, products types, yields.

      • Definition of hydrocarbon families. Feedstock composition.
      • Potential outlets and main industrial uses of olefinic, diolefinic and aromatics hydrocarbons.

      • Chemical reactions, chemical reaction uses for the mass balance.
      • Studies of the thermodynamic conditions to make the chemical reaction feasible.
      • Chemical reactions limited by the chemical balance, rules to shift the chemical balance.
      • Rate of chemical reactions. Effect of a catalyst, catalyst behavior. Poisons and inhibitors.
      • Nota: these basic elements have been provided throughout the course as they enhance the understanding of the different topics.

      • Onsite unit description; operating conditions of the different sections, product yields.
      • Analysis of technical characteristics of desired transformations.
      • Elements of pyrolysis monitoring: definitions of the severity and the selectivity.
      • Influence of the operating parameters/pressure, temperature, flowrate, steam dilution ratio on the unit performances.
      • Impact of the feedstock origin on product yields.
      • Regulation and advanced process control.

      • Main washing systems for cracked gases: selection of systems implemented.
      • Amine washing system: absorption and regeneration.
      • Caustic washing system and treatment of waste caustic stream.
      • The sequence of washing stages in the scrubber.
      • Influence of the operating parameters on the quality of washing.

      • Adsorption-desorption balance.
      • Operation of cracked gases dryers during the drying and regeneration steps, drying optimization (temperature/run length relationship).

      • Role and purpose of the different hydrogenation processes, chemical reaction characteristics, main types of catalysts implemented.
      • Purification of hydrogen by methanation (if relevant).
      • Studies of selective hydrogenation units for C2, C3 and C4 cuts and hydrotreatment units for pyrolysis gasolines: analysis of the operating conditions of the unit, operating parameters of the plant, case studies for unit adjustment.

      • Incidents on the furnace: loss of feed flowrate, high temperature on one or more coils - Loss of firing - Loss of quench water…
      • Incidents on cracked gases scrubber : loss of caustic make-up, abnormal temperature of the caustic, loss of water washing at the top of the scrubber.
      • Incidents on dryers: insufficient regeneration, moist gas at outlet.
      • Incidents in the methanation section (if relevant): loss of the cold box and breakthrough of ethylene to the reactor.
      • Incidents on selective hydrogenations: management of feedstock inhibitors, changes of hydrogen quality, loss of catalyst activity and/or selectivity.
      • Nota: this part is delivered through case studies and analysis of feedback of on-site incidents.

Learning Objectives

  • Upon completion of the course, participants will be able to:
  • analyze chemical or physico-chemical phenomena involved in the different sections of the steamcracker, in order to solve problems in case of incidents,
  • explain the meaning of the main operating parameters of these processes and the influence of operating variables.

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.
  • Case studies done in groups based on typical running situations presented in the course.
  • Possible contribution of experienced staff in the daily operation of the plant.
To French entities : IFP Training is QUALIOPI certified ; you may contact your OPCO about potential funding.
Please contact our disabled persons referent to check the accessibility of this training program :