摘要:
The present invention relates to a method for preparing a dialkyloxydianhyrohexitol (dimethylisosorbide) composition by etherification of dianhydrohexitol (isosorbide). The aim of the invention is to achieve a "clean" method that avoids the use of a methylation agent such as dimethyl sulfate or methyl chloride, which generate stoechiometric quantities of salts, or expensive dialkyl-carbonates, wherein only one of the two methyl groups participates in the preparation of mixed isosorbide ethers. Said 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. The present invention further relates to a device for carrying out the method according to at least one of the previous claims, characterized in that said device includes a vaporization oven and a reaction oven.
摘要:
The invention relates to a method for the isomerisation of glucose into fructose in water in the presence of a solid base catalyst characterised by its reversibility of CO 2 adsorption at a low temperature, the catalyst being a catalyst comprising at least one supported or non-supported lanthanide oxide or a molecular sieve based on silicon containing the organic template thereof. The invention also relates to a method for preparing HMF from glucose, comprising the isomerisation of glucose into fructose.
摘要:
The invention relates to a method for producing furfural by reacting pentose in water and in the presence of carboxylic acid and a heterogeneous acid catalyst, said method being carried out in an aqueous solution of carboxylic acid as the reaction medium. The invention also relates to the production of furfural by reacting pentose in water and in the presence of carboxylic acid and a heterogeneous acid catalyst. The invention further relates to an aqueous solution of carboxylic acid rich in furfural.
摘要:
The invention relates to a method for preparing 5-hydroxymethylfurfural (HMF) by reacting hexose in water and in the presence of carboxylic acid. The present invention further relates to the preparation of 5-hydroxymethylfurfural (HMF) by reacting hexose in water and in the presence of carboxylic acid and of a heterogenous acid catalyst. The invention also relates to an HMF-rich carboxylic acid solution.
摘要:
The invention concerns solids comprising a single tungsten oxide layer on a zirconia support and/or titanium dioxide support, characterized in that the tungsten exhibits tetrahedral co-ordination, before and after calcining. The invention also concerns the method for preparing the solids, and their uses as acid catalysis reactions catalyst.
摘要:
The present invention relates to a compound a metal and a mesostructured support, wherein said mesostructured support comprises pores separated from each other by pore walls; and wherein said metal comprises atoms which are homogeneously and atomically dispersed at the surface and within the pore walls of said mesostructured support. The present invention also relates to a method of preparation of this compound, and its use as catalyst in a catalyzed reaction.