Método para preparar dialquiloxidianhidrohexitoles mediante la eterificación de dianhidrohexitoles utilizando un alcohol inferior, en presencia de un catalizador ácido

Un método para preparar una composición basada en dialquiloxidianhidrohexitoles mediante la eterificación de 1,4:3,6-dianhidrohexitoles con al menos un agente O-alquilante, en presencia de un catalizador sólido, y caracterizado por que el agente de eterificación se selecciona del grupo que comprende: - alcoholes; - y sus mezclas. A method for preparing a dialkyloxydianhyrohexitol (dimethylisosorbide) composition by etherification of dianhydrohexitol (isosorbide). The aim is to achieve a "clean" method that avoids the use of a methylation agent such as dimethyl sulfate or methyl chloride, which generates stoechiometric quantities of salts, or expensive dialkyl-carbonates, wherein only one of the two methyl groups participates in the preparation of mixed isosorbide ethers. The method involves using at least one O-alkylation agent and a catalyst including an acid or an acid salt, preferably a catalyst having Lewis or BrØnsted acid properties. A device for carrying out the method wherein the device includes a vaporization oven and a reaction oven is also described.