23-P-22 - The design of zeolites catalysts for the synthesis of organe blossom and apple fragrances

This chapter describes the design of zeolites catalysts for the synthesis of orange blossom and apple fragrances. The synthesis of the propylene glycol acetal of methylnaphthyl ketone and the ethylene glycol acetal of ethyl acetoacetate, which are flavoring materials with orange blossom and apple scent, respectively, have been obtained successfully in presence of different zeolites. A higher concentration of acid sites in the catalyst does not guarantee a better catalytic performance, and for acetalization reaction, the hydrophobic properties of catalyst are as important as the concentration of active sites. The control of the textural and adsorption properties plays a crucial role in optimizing a zeolite catalyst for the production of these two fragrances.