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Recovery of acetate by anion exchange with consecutive CO2-expanded methanol desorption

A model-based approach

Journal Article (2018)
Author(s)

Carlos I. Cabrera-Rodríguez (TU Delft - BT/Bioprocess Engineering)

Carlos M. Cartin-Caballero (TU Delft - BT/Bioprocess Engineering, Universidad Nacional de Costa Rica)

Evgenia Platarou (TU Delft - Applied Sciences)

Florence A. de Weerd (TU Delft - Applied Sciences)

Luuk A.M. van der Wielen (University of Limerick, TU Delft - BT/Bioprocess Engineering)

Adrie J.J. Straathof (TU Delft - BT/Bioprocess Engineering)

DOI related publication
https://doi.org/10.1016/j.seppur.2018.03.068 Final published version
More Info
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Publication Year
2018
Language
English
Volume number
203
Pages (from-to)
56-65
Downloads counter
222
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Institutional Repository
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Abstract

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.