Sorption kinetics of riboflavin from diluted lactose solution in batch systems

Adsorption of riboflavin in water and in lactose solution onto adsorbent resin Amberlite FPX66 was carried out in three different types of batch system. The solution with adsorbent resin was shaken in a temperature controlled shaker, or stirred in a vessel placed in a temperature controlled water-bath or the solution was recirculated through two packed and jacketed columns of different sizes. It was found that in all systems, the adsorption rate was slightly higher at a lower temperature in the range from 30 to 60 C. A pseudo-second-order kinetic model was consistent with the adsorption rate in the first two batch systems. In contrast, the adsorption rate of water and of lactose in the columns was consistent with a pseudo-first-order kinetic model at all tested flow rates.