Adsorption of 1,3-propanediol from synthetic mixture using polymeric resin as adsorbents

摘要

The aim of this work was to separate 1,3-PDO from synthetic mixture using polymeric resins, Amberlite XAD-7 and XAD-16 resins. The equilibrium adsorption of 1,3-PDO onto two polymeric resins were investigated in single and binary systems.Experimental results of single component adsorption equilibrium indicated that the adsorption capacity (q) of 1,3-PDO at 160 g/L onto XAD-7 and XAD-16 was 835.96 and 584.61 mg 1,3-PDO/g dry resin, respectively. The equilibrium adsorption data were adequately characterized by Freundlich model. The value of KF and n of 1,3-PDO adsorbed on XAD-7 are much higher than those on XAD-16. This result suggested that the XAD-7 is favorable for 1,3-PDO adsorption than XAD-16 resin.Moreover, the value of adsorption capacity of 1,3-PDO in single and binary components were compared at the same conditions. The results showed that the selectivity of 1,3-PDO from XAD-7 was approximately six times higher than XAD-16 but, interestingly, in binary components, the adsorption capacity of 1,3-PDO at 160 g/L onto XAD-16 was higher than XAD-7. However, the mass of adsorbed/desorbed 1,3-PDO from XAD-16 at 160 g/L was higher than XAD-7, which demonstrated that the adsorption of 1,3-PDO onto XAD-16 is favorable than XAD-7 in binary components. Furthermore, the investigation about desorption by ethanol/water mixture at 50% (v/v) indicated that the desorption yield from XAD-7 was 80.91% which was lower than the XAD-16 (85.13%). This was due to more favorable adsorption characteristic of XDA-7 resin than XAD-16 resin.