36 results about "2,5-Dimethylfuran" patented technology

Catalytic processes for the conversion of 2,5-dimethyl furan (DMF) to para-xylene are described. Para-xylene is a key product that is currently obtained commercially from petroleum sources. However, it has now been determined that the cycloaddition of ethylene to DMF provides an alternative route to para-xylene. Advantageously, the DMF starting material for the processes may be synthesized from carbohydrates (e.g., glucose or fructose), thereby providing a pathway that relies at least partly, if not completely, on renewable feedstocks.

The present disclosure provides methods to produce para-xylene, toluene, and other compounds from renewable sources (e.g., cellulose, hemicellulose) and ethylene in the presence of an acid, such as a Lewis acid. For example, cellulose and / or hemicellulose may be converted into 2,5-dimethylfuran (DMF) and 2-methylfuran, which may be converted into para-xylene and toluene, respectively. In particular, para-xylene can then be oxidized to form terephthalic acid.

The invention discloses a hydrophobic palladium / metal organic framework material which is a solid catalytic material prepared by taking a porous metal organic framework as a carrier, introducing elemental palladium by using an impregnation-reduction method, and then, carrying out polydimethylsiloxane coating treatment. The invention further discloses a method for preparing 2,5-dimethylfuran by selectively catalyzing hexose by using the hydrophobic palladium / metal organic framework material. The method comprises the steps: dissolving hexose into alcohol, and carrying out a reaction at 70-130 DEG C for 0.25-12 h under the action of an acidic additive by taking the hydrophobic palladium / metal organic framework material as a catalyst and polymethylhydrosiloxane as a hydrogen donor, wherein theconcentration of hexose in alcohol is 0.2-10wt%, and the total quantity of Pd contained in the used hydrophobic palladium / metal organic framework material is 0.1-5mol% relative to hexose. The hydrophobic palladium / metal organic framework material disclosed by the invention is stable in structure, and the catalytic efficiency is obviously higher than that of a commercially available palladium carbon and common palladium / metal organic framework material under the same condition.

The present disclosure provides methods to produce para-xylene, toluene, and other compounds from renewable sources (e.g., cellulose, hemicellulose, starch, sugar) and ethylene in the presence of a catalyst. For example, cellulose and / or hemicellulose may be converted into 2,5-dimethylfuran (DMF), which may be converted into para-xylene by cycloaddition of ethylene to DMF. Para-xylene can then be oxidized to form terephthalic acid.

Provided herein are methods of producing dialkylfurans, such as 2,5-dimethylfuran, and other alkyl furans, such as 2-methylfuran. For example, 2,5-dimethylfuran may be produced by reducing (5-methylfuran-2-yl)methanol or 2-(chloromethyl)-5-methylfuran.