585 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 relates to a method for preparing furfural compounds from biomass. The method specifically comprises the preparation of a solid acid catalyst and a reaction process of the solid acid catalyst. The method disclosed by the invention can also be applied to biomass derivatives. The method comprises the steps of adding biomass or biomass derivatives and the solid acid catalyst to a reactor, filling with protective gas, and adopting an organic solvent / saturated inorganic salt aqueous-solution two-phase reaction system, thereby obtaining furfural and 5-hydroxymethylfurfural in a high yield manner under mild conditions. The method has the advantages that after the reaction is completed, the produced furfural and 5-hydroxymethylfurfural are efficiently extracted into an upper-layer organic phase, the solid acid catalyst and an unreacted substrate are retained in a bottom-layer water phase, the furfural, the 5-hydroxymethylfurfural or a mixture of the furfural and the 5-hydroxymethylfurfural can be obtained through simple separation, and fine chemicals and liquid fuels can be prepared in a manner that the furfural, the 5-hydroxymethylfurfural or the mixture of the furfural and the 5-hydroxymethylfurfural serves as a reaction intermediate; and the used catalyst is pollution-free and can be recovered and reused, so that the method has good industrial application prospects.

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 IIis 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.

A catalyst for preparing furfuryl alcohol by gas-phase hydrogenation of furaldehyde is prepared from MgO articles (less than 100 nm) as carrier, Cu (27-46 wt.%) and Co (2-6 wt.%). Its advantages are high activity, selectivity (100%) and stability, high conversion rate (above 99% after reaction for 10 hr), and simple preparing process.

The invention discloses and provides a method for producing 1,2-pentadiol in one-step hydrogenation by furaldehyde with wide source, low price, high development yield, simple process and small environmental contamination. The method comprises the following steps of: catalyzing furaldehyde serving as a raw material and compound oxide containing copper oxide serving as a catalyst on a continuous fixed bed; and hydrogenating to prepare the 1,2-pentadiol at a temperature of between 100 and 200 DEG C and pressure of between 4.0 and 10.0MPa, wherein the furaldehyde is high in conversion rate and the 1,2-pentadiol is high in selectivity. According to the method, the 1,2-pentadiol is produced by utilizing the renewable resource furaldehyde, the raw materials is rich in source and low in cost; a base metal is adopted as the catalytic material, so that the catalyst has low price; and the selective hydrogenation technology with short process flow, easy operation and no pollution is adopted.

The invention describes processes to prepare levulinic acid, formic acid and / or hydroxymethyl furfural from various biomass materials.

Accordingly, the current invention provides a method for the manufacture of a mixture of 5-hydroxymethylfurfural ethers by reacting a hexose-containing starting material or HMF with mixed alcohols in the presence of an acid catalyst.

A method for preparing hydroxymethylfurfural, which includes: a) mixing and dissolving triose or its derivatives and solvent 1 to obtain the first reaction mixture; b) reacting the obtained first reaction mixture with Alkaline Catalyst 1 to condense into hexose; c) mixing and dissolving the resulting hexose and solvent 2 to obtain the second reaction mixture; d) adding acid catalyst 2 to the second reaction mixture, then heating the second reaction mixture at 80˜280° C. to form the third reaction mixture including hydroxymethylfurfural; e) obtaining the hydroxymethylfurfural separating by separating from the third mixture. The method is a new synthetic way for preparing 4-hydroxymethylfurfural and 5-hydroxymethylfurfural.

The invention discloses a method for preparing dihydroxymethyl tetrahydrofuran, which comprises the following steps: arranging 5-hydroxymethylfurfural and a metal loaded carbon nitride material in a reactor, adding distilled water, introducing hydrogen gas, and reacting at 40-80 DEG C for 1-6 hours to obtain the dihydroxymethyl tetrahydrofuran, wherein the metal is a ruthenium / palladium / platinum loaded carbon nitride material; the loaded amount of the metal is 1-10%; the pressure of the hydrogen gas is 0.5-2 MPa; and the mass ratio of the metal loaded carbon nitride material to the 5-hydroxymethylfurfural is (0.2-0.8):1. The method is mild in reaction conditions and has high dihydroxymethyl tetrahydrofuran yield.

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 method for generating electricity using cow dung as fuel. The method comprises the following steps of: burning the cow dung in a steam boiler to prepare high-pressure steam; using the high-pressure steam to drive a steam turbine to rotate; and using the steam turbine to drive an electric generator to rotate for generating electric current, wherein the cow dung needs pre-treatment before being fed to a boiler furnace, and the pre-treatment comprises the following steps of: carrying out solid-liquid separation to fresh cow dung, so that the moisture content of the cow dung is smaller than or equal to 55%, and then wet cow dung is obtained; mixing and uniformly stirring the wet cow dung with furaldehyde residue to acquire the dung residue mixture; drying the dung residue mixture to acquire the dry dung residue mixture; thermoforming the dry dung residue mixture to acquire the cow dung electricity-generating fuel. The method uses the cow dung as the fuel to produce high-temperature and high-pressure steam which drives the steam turbine to rotate, so that the steam turbine drives the electric generator to rotate and generate electricity, thus the purpose of using cow dung to replace non-renewable resources such as coal or petroleum and the like to generate electricity is achieved.

The invention discloses an acid curing adhesive which comprises plant phenol, furfuryl alcohol and furfuraldehyde extracted from natural resources, strong alkali catalyst and urea, wherein the prescriptions and the weight percentages of the constituents are as follows: 50-70% of plant phenol, 20-40% of furfuryl alcohol, 0-20% of furfuraldehyde, 0-15% of urea and 0-10% of catalyst. The preparation method comprises the steps: weighing the raw materials according to the weight percentages, adding the plant phenol, the furfuraldehyde and the urea into a reaction kettle, adding the catalyst when the temperature is raised to 40-60 DEG C, carrying out heat preservation for 0.5-1.5 hours, warming the mixture to 80-90 DEG C, carrying out heat preservation for 0.5-1.5 hours, warming the mixture to 100-120 DEG C, carrying out heat preservation for 0.5-1.5 hours, cooling the mixture to 40-60 DEG C, adding the furfuryl alcohol into the mixture to adjust the PH value, warming the mixture to 90-110 DEG C when the PH value is 4-5.5, and keeping the reaction for 0.5-1.5 hours; cooling the mixture to 40-60 DEG C and adjusting the PH value to 6-7.

The invention discloses a method for preparing furaldehyde from a steam exploded stalk rinse solution catalyzed by using solid acid with an added polymerization inhibitor. The invention belongs to the technical field of bio-based chemical preparation. According to the invention, solid acid is used for replacing traditional strong acid in catalyzing pentose in steam exploded stalk rinse solution to subject to a cyclodehydration reaction, such that furaldehyde is prepared. During the reaction process, the polymerization inhibitor is added, such that side-reactions are inhibited. With modifications of the conditions, a maximum yield of furaldehyde reaches 37.5%, which is 68.1% of a theoretic yield. After the reaction, the solid catalyst can be repeatedly used, and can be reclaimed after high-temperature treatment. With the method, fractionated high-value utilization of three components of the stalks is realized. The solid acid is easy to be separated from a product, and can be reclaimed and reused, such that equipment corrosion can be avoided, and three-waste discharging can be reduced. With the added polymerization inhibitor, furaldehyde yield can be substantially improved. With the method for preparing furaldehyde from steam exploded stalk rinse solution catalyzed by using solid acid with added polymerization inhibitor, clean and high-efficiency conversion of the stalks is realized, such that a development trend of current green industries is satisfied. Therefore, the method has wide application prospect.

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 discloses a method for preparing 2,5-dimethyl furan by catalyzing selective hydrodeoxygenation of 5-hydroxymethyl furfural. The method comprises the following steps: by taking a supported metal as a catalyst, taking hydrogen as a hydrogen source, taking an organic solvent as a reaction solvent, converting 5-hydroxymethyl furfural into the 2,5-dimethyl furan under the proper reaction temperature, reaction time and stirring speed. According to the method disclosed by the invention, the reaction conditions are mild, and the equipment requirement is low; the operation process is simple and easy to master; the target product yield is high and can be 94.7 percent; the target products can be separated and purified by utilizing a method for combining simple atmospheric distillation with reduced pressure distillation; and moreover, the catalyst and the reaction solvent can be recycled and can be repeatedly used, the waste emission amount is small, and the method is green and environmentally friendly and has extremely high practicality and good industrial prospects.

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.

An integrated process is described for producing 2,5-furandicarboxylic acid and / or a derivative thereof from a six carbon sugar-containing feed, comprising: a) dehydrating a feed comprising a six-carbon sugar unit, in the presence of a bromine source and of a solvent, to generate an oxidation feed comprised of at least one of 5-hydroxymethylfurfural and / or a derivative or derivatives of 5-hydroxymethylfurfural in the solvent, together with at least one bromine containing species; b) contacting the oxidation feed from step (a) with a metal catalyst and with an oxygen source under oxidation conditions to produce an oxidation product mixture comprising 2,5-furandicarboxylic acid (FDCA) and / or a derivative thereof, the solvent, and a residual catalyst; c) purifying and separating the mixture obtained in step (b) to obtain FDCA and / or a derivative thereof and the solvent; and d) recycling at least a portion of the solvent obtained in step (c) to step (a).

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

The invention discloses a preparation method for 5-hydroxymethylfurfural. The preparation method is characterized by comprising the steps of mixing fructose, glucose or saccharose and dimethylsulfoxide, n-butyl alcohol, sec-butyl alcohol, cyclohexanol, 1,4-dioxane, polyethylene glycol 400 or acetonitrile according to the mass volume ratio of 1g: (5-10ml) and stirring; performing heating reaction in the presence of a solid acidic catalyst FeCl3.6H2O / C, and concentrating and purifying reaction liquid to obtain a product 5-hydroxymethylfurfural. Compared with the prior art, the preparation method disclosed by the invention has the characteristics of simple technology, convenient operation, low production cost, high yield and mild reaction conditions; the use of high-toxicity chemical raw materials is avoided, and the environment cannot be polluted; furthermore, the catalyst is low in price, readily available and high in efficiency and can be recycled for multiple times; environment protection aims of environment friendliness, low carbon, low price, ready availability and circulating sustainable development are fulfilled; and the preparation method is particularly suitable for industrial large-scale production.

The invention discloses raoultella terrigena for synthesizing 2,5-furan dicarboxylic acid and an application of the raoultella terrigena, and belongs to the technical field of microorganisms. The raoultella terrigena BF60 strain disclosed by the invention is preserved at the China Center for Type Culture Collection on August 26, 2014; and the preservation number is CCTCC No.M2014391. The raoultella terrigena is screened from the soil near the factory of producing 5-hydroxymethyl furfural. The yield of 2,5-furan dicarboxylic acid which is produced by whole-cell transformation on the raoultella terrigena can reach 7.95g / L; and a foundation is laid for further utilization of native raoultella terrigena to produce 2,5-furan dicarboxylic acid. The method for producing 2,5-furan dicarboxylic acid by using the raoultella terrigena disclosed by the invention is simple, and has a good application prospect.