Synthesis of acetals using molecular sieves III The use of solid acids as catalysts

Abstract

AbstractThe synthesis of acetals from the corresponding carbonyl compounds and alcohols in high yield is described. Commercial silica‐alumina cracking catalysts, Y‐type molecular sieves partially exchanged with multivalent cations and sulfonated polystyrene resins are used as catalysts while a molecular sieve type A serves to shift the equilibrium by adsorbing the water formed. Proper activation of silica‐alumina and Y‐sieve catalyst is essential for obtaining a high catalytic activity. Procedures have been developed to regenerate the catalyst‐adsorbent combination.Compared to earlier techniques the synthesis of acetals has been improved substantially.