Photocatalysis has been coupled with pervaporation to enhance the conversion and the selectivity in the partial oxidation of ferulic acid in aqueous solution to produce vanillin. Membranes in PEBAX® (polyether block amide) were prepared by solvent casting on glass plates and were utilized in a system where an annular photocatalytic slurry reactor and a pervaporation module were connected by a recirculating loop. The high selectivity of the membrane towards vanillin allowed to retain almost completely the reactant while pervaporating vapours of vanillin, which were deposited as pure crystals at ambient temperature. The simultaneous production and recovery of vanillin allow to increase the selectivity by avoiding the consecutive oxidation of the product. Concurrently, the photocatalytic particles remain in the reacting system so that there is no loss of catalyst and the permeate is absolutely powder-free.
G. CAMERA-RODA, V. AUGUGLIARO, A.CARDILLO, V. LODDO, G. PALMISANO, L. PALMISANO (2012). A PERVAPORATION PHOTOCATALYTIC REACTOR FOR THE GREEN SYNTHESIS OF VANILLIN. PORTO : Sociedade Portuguesa de Química.
A PERVAPORATION PHOTOCATALYTIC REACTOR FOR THE GREEN SYNTHESIS OF VANILLIN
CAMERA RODA, GIOVANNI;CARDILLO, ANTONIO GAETANO;
2012
Abstract
Photocatalysis has been coupled with pervaporation to enhance the conversion and the selectivity in the partial oxidation of ferulic acid in aqueous solution to produce vanillin. Membranes in PEBAX® (polyether block amide) were prepared by solvent casting on glass plates and were utilized in a system where an annular photocatalytic slurry reactor and a pervaporation module were connected by a recirculating loop. The high selectivity of the membrane towards vanillin allowed to retain almost completely the reactant while pervaporating vapours of vanillin, which were deposited as pure crystals at ambient temperature. The simultaneous production and recovery of vanillin allow to increase the selectivity by avoiding the consecutive oxidation of the product. Concurrently, the photocatalytic particles remain in the reacting system so that there is no loss of catalyst and the permeate is absolutely powder-free.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
