Adsorption of glutamic acid on weakly basic ion exchanger: Equilibria

• Published in: Chemical engineering science 1995, Vol.50 (14), p.2203-2210
• Main Authors: Yoshida, Hiroyuki, Kishimoto, Noboru
• Format: Article
• Language: English
• Subjects: Adsorption; Applied sciences; Chemical engineering; Exact sciences and technology
• ISSN: 0009-2509; 1873-4405
• DOI: 10.1016/0009-2509(95)00077-I

Equilibria for adsorption of l-glutamic acid on a general weakly basic ion exchanger which has only one kind of fixed ammonium group are investigated theoretically and experimentally. The experimental equilibrium isotherm for adsorption of l-glutamic acid on the commercial weakly basic ion exchanger was independent of the initial concentration of l-glutamic acid but depended on pH of the solution significantly. The significant effect of pH in the experimental equilibrium isotherm disappeared in the plots of equilibrium amount of l-glutamic acid in the resin phase vs the concentration of the neutral l-glutamic acid in the liquid phase. This suggested that the adsorption of l-glutamic acid was controlled by the acid/base neutralization reaction between neutral l-glutamic acid and fixed ammonium group of the weakly basic ion exchanger. Theoretical equations for equilibrium isotherm for adsorption of l-glutamic acid on the weakly basic resin was derived by assuming acid/base neutralization reaction between carboxylic group of the neutral l-glutamic acid and the fixed ammonium group of resin. The experimental equilibrium isotherms for any constant pH and the effect of pH on the equilibrium amount of l-glutamic acid adsorbed on the weakly basic resin were determined well from the theoretical equations.