Adsorption and desorption behaviour of taurine on macroporous adsorption resins

Adsorption of taurine on S-8, NKA2 and Amberlite XAD-1 resins was measured with respect to time and the results indicated that equilibrium was reached in 50min. The adsorption isotherns of taurine on D4006, AB-8, S-8, NKA2 we re recorded and compared with those using Amberlite XAD-1, XAD-3, XAD-6 and XAD-7 at 28 degreesC.. For an aqueous concentration range of 0-100mg g(-1) , each isotherm could be represented as a straight line. S-8 and XAD-1 resi ns had the highest solid/liquid distribution coefficients of 0.92 and 0.9. Since the locally produced S-8 resin is less expensive than XAD-1 resin, it was selected for further studies with adsorption isotherms being measured over the aqueous concentration range of 0-160 mg g(-1). These experimental results could be fitted By the Langmuir equation. The effects of pH, saltin g-out and temperature on the adsorption were studied with the results showi ng that the influence of temperature was the most important. A temperature- swing adsorption process was then tested to separate taurine from aqueous s olutions and gave a overall yield > 90% when taurine was adsorbed at 28 deg reesC and eluted by deionized water at 70 degreesC. (C) 2001 Society of Che mical Industry.