The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 26, 2016
Filed:
Aug. 05, 2013
Roquette Freres, Lestrem, FR;
Centre National DE LA Recherche Scientifique - Cnrs, Paris, FR;
Universite Claude Bernard Lyon 1, Villeurbanne, FR;
Mathias Ibert, La Chapelle d'Armentieres, FR;
Nadine Essayem, Saint Just Chaleyssin, FR;
Cyril Feche, Leyment, FR;
Alain Perrard, Saint-Foy-les-Lyon, FR;
ROQUETTE FRERES, Lestrem, FR;
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE-CNRS, Paris, FR;
UNIVERSITE CLAUDE BERNARD LYON 1, Villeurbanne, FR;
Abstract
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.