Recovery of acetate by anion exchange with consecutive CO2-expanded methanol desorption: A model-based approach

Carlos I. Cabrera-Rodríguez, Carlos M. Cartin-Caballero, Evgenia Platarou, Florence A. de Weerd, Luuk A.M. van der Wielen, Adrie J.J. Straathof

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
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Production of bio-based acetate is commonly hindered by the high costs of the downstream processing. In this paper, a model is developed to describe a new method that recovers acetate salts using anion exchange resins, and subsequently desorbs and upgrades them using CO2-expanded alcohol. The model consists of equilibrium parameters for both the adsorption and desorption step. The calculated parameters are: for the adsorption KCl- Ac- =0.125, KCl- HCO3 - =0.206 and KOV,HAc=0.674[Formula presented], and for the desorption pKMeCO3 - Ac- =3.71. The maximum experimental concentration of acetic acid obtained in CO2-expanded methanol is 0.427 mol/kg (20 g/LMeOH) at an operating pressure of 31 bar. The model represents the expected trends for all species, and can be used to design a multicolumn system for the recovery and upgrading of carboxylates.

Original languageEnglish
Pages (from-to)56-65
Number of pages10
JournalSeparation and Purification Technology
Publication statusPublished - 12 Sep 2018


  • Acetate
  • Anion exchange
  • CO-expanded methanol
  • Desorption
  • Ion exchange modeling


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