Sorption of Vanillin by Highly Basic Anion Exchangers under Dynamic Conditions

Resumo

Features of the dynamic extraction of vanillin from aqueous solutions using highly basic anion exchangers with a gel or macroporous structure are studied. The possibility of their regeneration is evaluated and the most efficient desorbents for this aromatic aldehyde are selected. Using the macroporous-structure anion exchangers is shown to have advantages in recovering vanillin due to their more rapid and complete regeneration. The presence of vanillin dimers and trimers in the feed solution is confirmed by ESI-MS and found to result in expansion of the sorbent matrix and an increase in its capacity in the second and subsequent cycles.