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

A model-based approach

Journal article (2018)

Authors

C.I. Cabrera Rodriguez BT/Bioprocess Engineering - AS
C.M. Cartin Caballero Universidad Nacional de Costa Rica, BT/Bioprocess Engineering - AS
E. Platarou Applied Sciences
F.A. de Weerd Applied Sciences
L.A.M. van der Wielen University of Limerick, BT/Bioprocess Engineering - AS
Adrie J.J. Straathof BT/Bioprocess Engineering - AS
Research Group
BT/Bioprocess Engineering (AS) (TU Delft)
Copyright: © 2018 C.I. Cabrera Rodriguez, C.M. Cartin Caballero, E. Platarou, F.A. de Weerd, L.A.M. van der Wielen, Adrie J.J. Straathof
DOI: https://doi.org/10.1016/j.seppur.2018.03.068
More Info
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Published Date

12-09-2018

Language

English

Faculty

Applied Sciences

Department

BT/Biotechnologie

Research Group

BT/Bioprocess Engineering

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.