570 results about "Furaldehyde" patented technology

The provides compounds for the treatment of sickle-cell disease. In particular, the invention provides 5-membered heterocyclic anti-sickling agents that are highly effective and non-toxic, and methods for their use. The compounds include analogues and derivatives of naturally occurring occurring 5-hydroxymethyl-2-furfuraldehyde, 5-Ethyl-2-furfuraldehyde, 5-Methyl-2-furfuraldehyde, and 2-furfuraldehyde, and prodrug forms of the compound.

The invention discloses a method for synthesizing 2,5-furandicarboxylic acid through catalytic oxidation by using 5-hydroxymethylfurfural as a raw material. 5-hydroxymethylfurfural can be oxidized by using oxygen or air as an oxidant in the presence of a catalyst prepared by loading an alkaline carrier with noble metal with high efficiency and high selectivity to synthesize 2,5-furandicarboxylic acid. A catalytic reaction is easy to operate and mild in conditions; when 5-hydroxymethylfurfural is fully converted, the selectivity of the product-2,5-furandicarboxylic acid can reach more than 99%; the catalyst is good in reusability.

5-hydroxymethylfurfural of the formula II

is prepared via a 5-acyloxymethylfurfural as an intermediate.

The invention belongs to the technical field of productions of chemical products, in particular to a method for preparing 5-hydroxymethylfurfural. The method includes steps of taking a macromolecular polyphosphazene polymer matrix as a solid acid type heterogeneous catalyst, taking monosaccharide, disaccharide or polysaccharide as raw materials, reacting for 5minutes to 24 hours in single-component solvent or double-component solvent such as dimethyl sulfoxide, acetonitrile, methyl isobutyl ketone, water and the like at the temperature of 25-120 DEG C under normal pressure, and finally producing the 5-hydroxymethylfurfural efficiently. The method has the advantages that conversion efficiency of raw material is high, HMF selectivity is good, operation conditions are mild, reaction speed is high, the processing is simple and environment-friendly, the catalyst is easy to prepare and the like, corrosion to equipment and environment pollution due to common liquid strong-acid homogenous catalysts are avoided, and a new way is developed for preparing commodity chemicals and substitute fuels according to regenerative biological resources.

The invention relates to a method for synthesis of dimethyl furan-2, 5-dicarboxylate from 5-hydroxymethylfurfural by means of catalytic oxidation. The method adopts oxygen or air as the oxidant and uses a cheap metal catalyst for efficient and highly selective catalysis of 5-hydroxymethylfurfural oxidation esterification, thus synthesizing dimethyl furan-2, 5-dicarboxylate. The catalytic reactionof the method has simple operation and mild conditions, the reaction system has no need for adding alkali additive, the 5-hydroxymethylfurfural conversion rate reaches 99% or more, and the yield of the product dimethyl furan-2, 5-dicarboxylate can reach 99%.

The invention discloses a method for synthesizing 2,5-dihydroxymethylfuran by selective hydrogenation of 5-hydroxymethylfurfural. The method is characterized in that a magnetic metal-organic coordination polymer is used as an acid and base bifunctional catalyst, low-price and easily-obtained low carbon alcohol is used as an in-situ hydrogen donor, and the 5-hydroxymethylfurfural is efficiently transformed into the 2,5-dihydroxymethylfuran by a selective transfer hydrogenation reaction under mild operation conditions and the maximum yield of the 2,5-dihydroxymethylfuran can be up to 98.6 percent. The magnetic metal organic coordination polymer used in the method disclosed by the invention has the advantages of relatively-high acid-base strength, more acid-base sites, relatively-large specific surface area and suitable pore size; in addition, the magnetic metal organic coordination polymer is simple in preparation process, is easy to separate and recover and shows excellent catalytic activity and catalytic stability. Furthermore, the low carbon alcohol is used as the in-situ hydrogen donor in the invention, so that the use of molecular hydrogen is avoided and the safety of the reaction process is improved; besides, the low carbon alcohol can be used as a reaction solvent and the introduction of exogenous substances is reduced, and thereby the production cost can be further reduced.

A method of preparing 2,5-bis(hydroxymethyl)tetrahydrofuran comprises heating a reaction mixture comprising 2,5-(hydroxymethyl)furaldehyde, an organic solvent, and a catalyst system comprising nickel and zirconium at a temperature, for a time, and at a pressure sufficient to promote reduction of the 2,5-(hydroxymethyl)furaldehyde to 2,5-bis(hydroxymethyl)tetrahydrofuran to produce a product mixture comprising 2,5-bis(hydroxymethyl)tetrahydrofuran.

This invention relates to improved adhesion compositions and textile materials and articles treated therewith. The improved adhesion composition comprises a non-crosslinked resorcinol-formaldehyde and/or resorcinol-furfural condensate (or a phenol-formaldehyde condensate that is soluble in water), a rubber latex, and an aldehyde component such as 2-furfuraldehyde. The composition may be applied to textile substrates and used for improving the adhesion between the treated textile substrates and rubber materials. End-use articles that contain the treated textile-rubber composite include, without limitation, automobile tires, belts, and hoses as well as printing blankets.

The invention discloses a method for preparing 2,5-furan dicarboxylic acid through electro-catalytic oxidation of 5-hydroxymethylfurfural by a hydrotalcite-based layered catalyst. The method comprisesthe following steps: taking carbon fiber paper as a carrier, loading a layered hydroxide material on the carbon fiber paper through a hydrothermal reaction to serve as a working electrode, and implementing electro-catalytic oxidation by using a three-electrode system, thereby obtaining 2,5-furan dicarboxylic acid. The method has the following advantages: (1) the layered hydroxide catalyst is directly prepared by using a coprecipitation method, the synthesis method is simple and feasible, high-temperature calcination or high-pressure gas is not needed, and the energy consumption is low; (2) the carbon fiber paper is directly used as a substrate and has good contact with a catalyst material, so that the conductivity and the electron transmission efficiency are improved, and the cycling stability and the durability of the material are improved; and (3) the layered hydroxide material has an electro-catalytic oxidation performance on a biomass monomer, completes selective oxidation in a short time, and has excellent electro-catalytic oxygen production activity.

A process for preparing the organic aerogel and carbon aerogel by ordinary-pressure drying method includes reaction between resorcin and furaldehyde, in which the hexamethylene tetraamine is used as catalyst and organic reagent (isopropanol) is used as solvent, thermal setting to obtain organic gel, drying or baking to obtain organic aerogel, and charring in inertial gas to obtain carbon aerogel.

The invention provides a catalyst to prepare furfural gas 2-methylfuran and the preparation method. Silica is used as the carrier, copper oxide is used as the main active component and alkali metal or alkaline earth metal is used as the promoter. The preparation method of the catalyst adopts impregnation method. the catalyst has the advantages of high product yield, few by-products, little influence on environment, and long service life, etc, and is widely applicable in production of 2-methylfuran.

The invention belongs to the field of heterogeneous catalysts, and particularly provides an acid-base bifunctional solid catalyst and a preparation method thereof. The method comprises the steps that a silica-based mesoporous molecular sieve SBA-15 is selected as a carrier, ZrO2/SO4<2-> type solid superacid is loaded, obtained solid superacid is subsequently grafted with an acidic -SO3H group and a basic -NH2 group through a silane coupling reaction, and the acid-base bifunctional solid catalyst is obtained. The defects that in the reaction field of preparing 5-hydroxymethylfurfural (5-HMF) from cellulose, the activity is not high, and the selectivity is poor are overcome, and the preparation method of the acid-base bifunctional heterogeneous solid catalyst with a large specific surface area is provided.

The invention provides an immobilized metal porphyrin enzyme catalyst and a preparation method thereof. The catalyst can oxidatively catalyze hydroxymethyl furfural (HMF) to generate a furandicarboxylic acid (FDCA) on presence of a selective oxidant.

The invention discloses a preparation method of a xylogen-based magnetic solid acid catalyst. According to the method, xylogen which is enzymolysis residue is used as raw material and is sequentially subjected to pretreatment, dipping, carbonization and sulfonation to obtain xylogen-based magnetic solid acid catalyst. The preparation method of the xylogen-based magnetic solid acid catalyst has the advantages that the raw material price is low, the preparation cost is low, the prepared catalyst has the advantages of large specific surface area, high acid load, good thermal stability, has relatively high catalytic activity in cellulose hydrolyzation reaction, fructose cellulose hydrolyzation and 5-hydroxymethylfurfural etherification reaction and can be reused after being simply magnetically seperated.

The invention relates to a method for detecting a traditional Chinese medicine injection for treating cardiovascular and cerebrovascular diseases. The detection method comprises a thin-layer identification method for medicinal materials including radix salviae miltiorrhizae and safflower carthamus, an inspection method for 5-hydroxymethyl furfural, total solids, heavy metals, harmful elements and the like, a high-performance liquid chromatography method of salvianic acid A sodium, protocatechu aldehyde, 4-cumaric acid, rosmarinic acid, danshinolic acid B and danshinolic acid A and an ultraviolet measurement method for measuring total phenols content. The method for detecting the quality of the traditional Chinese medicine injection provided by the invention is good in stability and repeatability, can be used for accurately qualitatively and quantitatively detecting the content of all effective components and impurity components and can be used for comprehensively and objectively evaluating the quality of the traditional Chinese medicine injection so as to finally guarantee the clinical medication safety and curative effect of the traditional Chinese medicine injection.

The current invention provides a method for the manufacture of an ether of 5-hydroxymethylfurfural by reacting a hexose-containing starting material with an olefin in the presence of an acid catalyst

A method for preparing 2, 5-furan diformic acid by water phase catalytic oxidation of 5-hydroxymethylfurfural is as follows: bismuth compound supported Pt or Pd is used as a catalyst, molecular oxygen is used as an oxidant, water is used as a solvent, efficient oxidation of the 5-hydroxymethylfurfural into the 2, 5-furan diformic acid can be realized, no alkali is added in the process, and the method has the advantages of mild reaction conditions, less oxidation by-products, repeatedly used catalyst and important application prospect.