pH Control Using an Identification Reactor

Su Whan Sung, In Beum Lee, Dae Ryook Yang

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


pH control plays an important role in chemical processes. However, pH control has been recognized as a very difficult control problem because of its nonlinearities and time-varying characteristics. A new pH control strategy using an identification reactor is proposed to incorporate both the nonlinearities and time-varying characteristics of the pH process. In this study, an equivalent titration curve between the pH value and the scaled total ion concentration of the titrating stream is obtained from the identification reactor, and the pH value is controlled in the main reactor using the obtained equivalent titration curve. A simple stability analysis is used to determine the tuning parameters of the PI controller. Simulation results show that the proposed control strategy can handle both the nonlinearities and time-varying characteristics.

Original languageEnglish
Pages (from-to)2418-2426
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Issue number7
Publication statusPublished - 1995 Jul 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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