581 results about "Furaldehyde" patented technology

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.

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 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 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.

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 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.