Abstract
One of the prerequisites to the development of a simulated moving bed (SMB) or a temperature-gradient SMB process for separation of succinic acid and lactic acid is to obtain their adsorption equilibrium data on a properly selected adsorbent. It was first found that an Amberchrom CG300C resin could function well as a qualified adsorbent for the separation processes of interest. On the basis of the selected adsorbent, the single-component adsorption equilibria of succinic acid and lactic acid were measured using a staircase frontal analysis method over the temperature range of (30 to 50) °C and the liquid-phase concentrations up to 10 g·L−1. The resultant adsorption data were correlated with the Langmuir and the bi-Langmuir adsorption models. For these two models, the effect of temperature on the Langmuir and the bi-Langmuir equilibrium constants was examined, which revealed that the adsorption of each acid onto Amberchrom CG300C was exothermic. Such a temperature effect was expressed mathematically, which...
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