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 invention discloses a catalyst for preparing 2,5-dimethylfuran through selective hydrogenolysis of 5-hydroxymethylfurfural and a preparation method of the catalyst. The catalyst consists of a catalyst carrier and carbon layer coated reactive metals, wherein the catalyst carrier comprises a carbon-based carrier, SiO2, TiO2 or Al2O3 and the like; and the reactive metals are selected from Co, Fe, Ni, Cu or Zn and other base metals. Compared with the conventional catalyst system, the catalyst disclosed by the invention has the advantages that (1) the reactive metal of the catalyst refers to a first transition metal, and the raw materials are cheap and readily available; (2) compared with a noble metal catalyst, the catalyst disclosed by the invention has extremely high activity and selectivity; and (3) the catalyst has magnetism and is easy to recycle.

The invention discloses a nickel-based catalyst and its preparation method and use in 5-hydroxymethylfurfural hydrogenation. The nickel-based catalyst has a general formula of NiAl or NiMAl, wherein M represents a metallic element selected from Zn, Mg and Mn, in NiAl, a mole ratio of Ni to Al is 1-3: 1, and in NiMAl, a mole ratio of Ni, M to Al is 1: 1: 1. Ni-based hydrotalcite as a precursor is roasted to form a high-dispersibility Ni-based catalyst with a high 5-hydroxymethylfurfural conversion rate (greater than 99%) and high 2, 5-dimethylfuran or 2, 5-dimethyltetrahydrofuran selectivity (greater than 95%). The nickel-based catalyst has the advantages of easily available raw materials, simple preparation method, operation convenience, low cost, repeatable utilization and latent economic benefits.

The invention relates to a method for preparing a 2,5-dimethyl furan by use of a fructose and a fructosyl biomass, and specifically relates to a method which comprises the following step: on the basis of adopting a mixed reaction medium of an ionic liquid and an organic solvent, and under the conditions of appropriate temperature and pressure, performing continuous dehydration and hydrogenation reactions on the fructose and the fructosyl biomass in the presence of a catalyst so as to convert the fructose and the fructosyl biomass into the 2,5-dimethyl furan. The method is used for preparing the target product by use of the biomass which is rich in fructose and is taken as the raw material by virtue of a one-pot method; a plurality of steps of reactions are coupled, the reaction steps are simple, the raw materials is cheap and regenerative, the operation is convenient and the product yield is high; a new method for preparing chemicals directly by use of the biomass is provided.

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 invention relates to a method for preparing DMF (2,5-dimethylfuran) from HMF (5-hydroxymethylfurfural) by catalytic hydrogenation. According to the method, a Co / rGO (cobalt and reduced graphene oxide) composite is used as a catalyst, the Co / rGO catalyst does not need reduction pretreatment, the conversion rate of HMF can reach 100% at 140-200 DEG C and under 1-2 MPa hydrogen pressure, and theyield of DMF exceeds 90%. The Co / rGO catalyst is cheaper than noble metal catalysts such as Pt and Pd, only C=O / C-O bond is dissociated, and the furan ring and C-C bond are not damaged, so that the catalyst has high selectivity to DMF, does not need pre-reduction treatment and has industrial application value.

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.

The invention relates to an acidic solid catalyst used for catalyzing conversion of fructose into 2,5-dimethylfuran in one step as well as a preparation method and application of the catalyst. The catalyst is composed of an acidic porous polymer loaded with metal nanoparticles, wherein the porous polymer is a multifunctional polymer, has different wettability and acidity, and can anchor metal ruthenium, platinum, rhodium, palladium, nickel and cobalt under milder conditions. The catalyst provided by the invention is used for catalyzing conversion of the fructose into the 2,5-dimethylfuran in one step, has excellent catalytic activity, high selectivity and strong stability, and provides a novel idea and method for conversion of bio-based materials into high-value-added chemicals.

The invention discloses a method for preparing 2,5-dimethyl furan through electrocatalytic reduction of 5-hydroxymethyl furfural by a ZrO2-doped graphite electrode. The method comprises the steps of preparing a 5-hydroxymethyl furfural / N,N-dimethyl acetamide stock solution through catalyzing dehydration of fructose; and implementing electrocatalytic reduction on the 5-hydroxymethyl furfural in an electrolytic bath by taking a ZrO2-doped graphite electrode as a negative electrode and a platinum electrode as a positive electrode, thus preparing the 2,5-dimethyl furan. The method disclosed by the invention successfully solves a problem of a 2,5-dimethyl furan preparation process through hydrogenation reduction of 5-hydroxymethyl furfural which is relatively high in equipment and catalyst expenses. The method, by taking ZrO2 as a catalyst, avoids use of precious metal (ruthenium, palladium and the like) in a conventional 5-hydroxymethyl furfural hydrogenation process, and simultaneously avoids direct use of H2 so as to effectively reduce cost of producing the 2,5-dimethyl furan; and the method disclosed by the invention is free from environmental pollution, relatively moderate in reaction condition and good in selectivity.

The invention provides a method for preparing 2,5-hexanedione under the catalysis of solid acid. The method comprises the following steps: adding an organic solvent with weak polarity, a solid acid catalyst and distilled water into a raw material 2,5-dimethylfuran and carrying out a reaction at a temperature of 80 to 200 DEG C for 1 to 12 h; quenching a reaction system so as to allow the temperature of the system to rapidly drop to normal temperature, taking out a reaction solution, then subjecting the reaction solution to filtering or centrifugation, drying the solid catalyst and recovering the dried solid catalyst; and collecting an organic phase, subjecting the obtained organic phase to reduced-pressure distillation and removing the organic solvent so as to obtain 2,5-hexanedione. The method provided by the invention has the advantages of easiness in separation and no pollution.

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.

The invention provides a method for preparing 2,5-dimethyl furan. The method comprises the following steps: under the action of a nickel metal catalyst, performing a hydrogenolysis reaction on 5-hydroxymethyl furfural in a solvent so as to obtain the 2,5-dimethyl furan, wherein the nickel metal catalyst is a loaded type double-metal catalyst; the nickel metal catalyst comprises effective active components including nickel and tungsten. According to the method provided by the invention, the nickel metal catalyst which takes nickel and tungsten as the effective components is adopted to catalyze HMF (Hydroxymethyl Furfural) to perform hydrogenolysis so as to obtain DMF (Dimethyl Formamide); the component nickel has a good hydrogenation capability, and can perform hydrogenation on an aldehyde group to be a hydroxymethyl group; the component tungsten has good Lewis acidity, can prompt breakage of a carbon-oxygen bond on the hydrogenolysis process of HMF, and can convert the hydroxymethyl group into a methyl group; under the dual functions of nickel and tungsten, the HMF can be efficiently and selectively converted into the DMF, and therefore, the yield of the DMF is relatively high.

The invention provides a method for preparing 2,5-dimethylfuran by catalyzing 5-hydroxymethylfurfural. The method includes the following steps that firstly, 5-hydroxymethylfurfural is added into organic solvent to prepare a 5-hydroxymethylfurfural solution; secondly, the 5-hydroxymethylfurfural solution is catalyzed by means of a heterogeneous iron-based catalyst for hydrodeoxygenation, and 2,5-dimethylfuran is obtained. According to the method, catalytic active metal of the heterogeneous iron-based catalyst in use is iron, and compared with noble metal ruthenium, palladium, platinum and the like, cost is low; compared with other non-noble metal catalysts, the heterogeneous iron-based catalyst is easy to prepare and convenient to operate, and catalytic activity and selectivity are high; the catalyst is used for catalyzing 5-hydroxymethylfurfural (HMF) to prepare 2,5-dimethylfuran (DMF), an efficient environment-friendly method is provided for preparation of DMF, and the heterogeneous iron-based catalyst recycled after catalytic reaction can be repeatedly used.