Modeling and simulation of an industrial-scale parex process

Marta S P Silva, Alírio E. Rodrigues, José P B Mota

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


The Parex unit for industrial-scale purification of p-xylene was studied through detailed simulation and the accuracy of the developed model tested against real industrial data. Starting from a comprehensive analysis of the construction and operation of the industrial unit, a simulation model was developed that incorporates the existing three major types of dead volumes: bed lines, which connect the beds to the rotary valve, circulation lines, which connect adjacent adsorbent chambers, and bed-head dead volumes, which are located upstream of each bed due to the existence of internals. By gathering operation data and surveys in the pumparound line and in the extract stream, three case studies were defined and compared with simulation results. The model is capable of predicting the performance of the industrial unit. Further simulations were made and compared with plant data to assess the effect of adsorbent capacity loss on the long-term performance of the unit.

Original languageEnglish
Pages (from-to)1345-1363
Number of pages19
JournalAiche Journal
Issue number4
Publication statusPublished - Apr 2015


  • Dead volumes
  • P-xylene
  • Parex
  • Simulated moving bed


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