36results about How to "Short yield" patented technology

The disclosed high-yield synthesis method for cage polyamino silsesquioxanes comprises: at 50-80Deg, dripping the gamma-aminoprotriethoxy silane of 1mol into the mixed liquid with 5-10mol deionized water, 50-100ml solvent with ethanol and cyanogen, 0.1-0.3ml trialkylamine as structural inhibitor and 2-5ml catalyst with amine compound; at 50-80Deg, refluxing and stirring for 18h, and removing the solvent at normal temperature to obtain the coarse product; cleaning by deionized water with mass as 10-20 times then by the acetone; finally, vacuum drying. This invention can speed up hydrolysis and the structural form, decreases side reaction.

The invention relates to a method for preparing isopentenol from 3-methyl-3-butenol, which performs isomerization reaction on a raw material of 3-methyl-3-butenol to generate the isopentenol in the presence of a catalyst in an atmosphere containing hydrogen, wherein the reaction pressure is normal pressure, the reaction temperature is between 50 and 90 DEG C, the reaction time is between 25 and 40 minutes, the catalyst uses Al2O3 as a carrier, a load active component is metal Pd, the content of the Pd in the catalyst in percentage by weight is between 0.1 and 2.0 percent, the particle size of the catalyst is between 80 and 200 meshes, and the weight ratio of the raw material to the catalyst is 30-100:1. Compared with the prior art, the method has obvious improvement, the catalyst is simpler, and the content of the active component is lower, thus the preparation is easier and the cost is lower; the reaction condition is mild; and on the premise of ensuring the selectivity and the product yield of a perfect product, the reaction time is greatly shortened. The reduction of the preparation cost of the catalyst and shortening of the reaction time finally reduce the overall production cost greatly.

The invention discloses a method for synthesizing bisphenol-F with the catalysis of phosphotungstic acid modified short channel HPW-Zr/SBA-15 catalyst. According to the method, the bisphenol-F is catalytically synthesized by taking the phosphotungstic acid modified short channel HPW-Zr/SBA-15 as a catalyst and taking phenol and formaldehyde as raw materials. The adopted catalyst is synthesized through a one step method by taking polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) as a template, taking tetraethylortho silicate as a silicon source, taking phosphotungstic acid as a catalyst active component, and taking zirconium oxychloride as a modifying agent, and is simple in preparation process, short in channel, favourable to improve the mass transfer and reaction efficiency, high in reaction activity, short in reaction time, high in catalytic efficiency, easy to separate, reusable, green and environment-friendly; any organic solvent is not required to be added in the reaction process.

The invention discloses a method and a device for preparing a hexafluoropropylene oxide oligomer. The device comprises a pipeline reactor, a liquid phase separation tank connected with the pipeline reactor, and a gas-liquid separation tank connected with the liquid phase separation tank, the pipeline reactor comprises a spiral pipeline filled with a filler, the spiral pipeline spirally extends vertically, a gas-liquid contact port is arranged at the upper end of the spiral pipeline, a the hexafluoropropylene oxide and catalyst mixed solution enters the pipeline reactor through the gas-liquid contact port, and flows from the upper end to the lower end along the spiral pipeline, a hexafluoropropylene oxide oligomer generated in the pipeline reactor flows into the liquid phase separation tankand realizes layering, a discharge valve is arranged at the outlet of the liquid phase separation tank, and the flow rate is controlled by the discharge valve to make the weight of the product flowing into the gas-liquid separation tank consistent with the weight of the product deposited in the liquid phase separation tank. The method and the device can increase the yield of hexafluoropropylene oxide oligomer.

The invention relates to a preparation method for high-purity jasminoidin, particularly a preparation method for high-purity jasminoidin based on liquid-liquid partitioning extraction, which comprises the following steps: pulverizing gardenia, soaking in water, carrying out ultrasonic-assisted extraction, filtering, combining the extraction liquids, and concentrating while depressurizing to obtain a gardenia extraction concentrate; regulating the pH value of the gardenia extraction concentrate to alkaline, and extracting while stirring at high speed by using a low-carbon alcohol as a solvent, thus obtaining an extraction liquid rich in jasminoidin; decolorizing the obtained extraction liquid, and concentrating the decolorized extraction liquid while depressurizing to obtain a decolorized concentrate; pouring the decolorized concentrate into an organic acid ester while stirring so as to crystallize and precipitate jasminoidin; and separating out crystallized jasminoidin precipitate, washing with the organic acid ester, and repeatedly washing the precipitate to obtain the high-purity jasminoidin. The preparation method provided by the invention completely discards chromatography, has the advantages of simple operation process, short production period, high efficiency and high yield and purity of the product, and is suitable for industrial production.

The invention discloses a solid acid catalyst and a preparation method and application thereof in esterification transesterification. The preparation method of the solid acid catalyst comprises the following steps of carrying out a liquid phase deposition reaction on a graphene oxide suspension dissolved with an aluminum salt to obtain aluminum oxide modified graphene oxide, and carrying out a mixed reaction on the aluminum oxide modified graphene oxide and concentrated sulfuric acid to obtain the solid acid catalyst. The preparation method is simple to operate, the method has the advantages of simple operation, mild conditions, very good catalysis effect on esterification and transesterification of the kitchen waste oil, realization of the fatty acid methyl ester yield higher than 90%, easy separation of the solid acid catalyst from the product, cyclic utilization after simple treatment, no pollution, and substantial reduction of the production cost of biodiesel prepared from the kitchen waste oil.

The invention belongs to the technology field of plant natural product preparation, and specifically discloses a extracting liquid for extracting plant polyphenol from rapeseed cake or rapeseed peel, peanut shell, apple, persimmon, grape, citrus, radish, soybean, jujube, pomegranate peel, banana peel, sweet potato, haw peel, tomato, nut, oat or lichee and a extracting method. The extracting liquid is a hydrogen peroxide solution with a pH value of 7.5 to 10.0, a sodium hypochlorite solution with a pH value of 7.5 to 10.0, a potassium hypochlorite solution with a pH value of 7.5 to 10.0, or a calcium hypochlorite solution with a pH value of 7.5 to 10.0. The preparation method comprises following steps: grinding the raw materials mentioned above, sieving, extracting with the extracting liquid mentioned above, optionally carrying out a supersonic treatment or a microwave treatment during the extracting process, and removing the slag through a centrifugal separation treatment so as to obtain the plant polyphenol leaching liquid. The extracting liquid for extracting plant polyphenol and the extracting method has the advantages of wide plant polyphenol sources and a very good industrial promotion and application prospect.

The invention provides a method for extracting spectinomycin from fermentation culture. A liquid ion exchanger is adopted to extract spectinomycin, sulfonic group in the liquid ion exchanger has highcombining ability with spectinomycin, so that spectinomycin can be selectively extracted quickly and accurately from a system containing a lot of impurities. By adopting the method, spectinomycin yield can be up to higher than 65%, purity can reach 98%, extracted spectinomycin is high in quality and meets EP and USP quality standards, and the method has the advantages of short period, little sewage discharge and low production cost.

The invention relates to a novel synthesis method for cis-octahydropyrrolo[3,2-b]pyrrole, and mainly solves the technical problems that raw materials are expensive, reaction conditions are harsh, a reaction route is long, the reaction operation is inconvenient, and a large number of isomers are generated through ring closure in the conventional cis-octahydropyrrolo[3,2-b]pyrrole preparation process. The method comprises the following steps of: performing alkylation reaction of industrially available 3-pyrrolidone serving as an initiative raw material and an allyl compound directly under the action of acid to obtain a 3-tetrahydro-pyrrolidone substitute; performing reductive amination reaction to obtain a 3-aminopyrrolidine derivative; performing protective group adding reaction; and performing ozonization reduction ring-closing reaction and dehydroxylation reaction on the 3-aminopyrrolidine derivative added with the protective group to obtain a corresponding cis-octahydropyrrolo[3,2-b]pyrrole derivative. The target product and important intermediates can be widely applied to synthesizing various pyrrole derivatives.

The invention discloses a preparation method of multi-hydroxy flavone shown as a formula. R can be hydrogen, hydroxyl and the like. Multi-hydroxy flavone has the pharmacological actions of virus resistance, bacterium resistance, tumor resistance, oxidation resistance, cardiovascular and cerebrovascular disease resistance and the like, and the synthesis of the multi-hydroxy flavone has a great practical value. The method comprises the following steps of: reacting 3,4-dimethoxy-5-substituted benzoyl chloride and 2-hydroxyl-4-methoxyacetophenone serving as raw materials to obtain a substituted benzoic acid aryl ester compound; rearranging to obtain a 1,3-disubstituted propanedione compound; generating a 7,3',4'-trimethoxy-5'-substituted flavone compound under the actions of a catalyst and microwaves; and hydrolyzing to obtain a 7,3',4'-trihydroxy-5'-substituted flavone compound. The method has the advantages of simple process, short reaction time, high yield, high product purity, large-scale production and wide application prospect.

The invention discloses a method for smelting and trapping platinum and rhenium from a spent aluminum-based catalyst. The method comprises the following steps: roasting and ball-milling the spent aluminum-based catalyst containing platinum to obtain crushed spent aluminum-based catalyst particles; uniformly mixing the spent aluminum-based catalyst particles with a trapping agent, a slag former and a fluxing agent to obtain a mixed material; and carrying out reduction iron matte smelting trapping on the mixed material, and obtaining smelting slag and iron matte alloy containing platinum and rhenium respectively. According to the method for smelting and trapping the platinum and the rhenium from the spent aluminum-based catalyst, the yield of the platinum and the rhenium in the iron matte is larger than 99.5% and 85.0% respectively from raw materials to the iron matte. The method has the advantages of simple process, high yield of platinum and rhenium, low cost, subsequent extraction of platinum from the enriched product, reduction of acid consumption, small environmental pollution and the like.

The invention discloses a preparation method of alpha-hydroxyl ketone compounds, which comprises the following steps: (1) adding sodium metal into an inert organic solvent, heating to 97-140 DEG C to melt sodium metal, and stirring the sodium metal to obtain fine particles; (2) keeping the temperature, and dropwise adding the mixture of inert organic solvent and alkyl fatty acid ester while stirring; and (3) after dropwise addition, keeping the temperature to react, cooling the mixture after reaction to room temperature, dropwise adding an acid to transform, standing until the mixture delaminates, washing the oil phase, drying, and distilling under reduced pressure to obtain the alpha-hydroxyl ketone compounds. The invention does not need to independently prepare sodium sand, and has the advantages of short reaction time, high product yield, simple technique, high safety and reliability, high production efficiency and stable product quality. The invention does not need to quickly stiror quench, and also does not need to independently prepare sodium sand, thereby solving the problem of large-scale industrial production.

The invention discloses a method for enriching copper and nickel from a secondary nickel return material of copper smelting slag, and belongs to the technical field of hydrometallurgy. The secondary nickel return material is a copper slag return material with the Cu/Ni < = 2: 1 obtained by carrying out multi-stage crushing, fine grinding and separation on the copper smelting slag, the secondary nickel return material is pulpified in a sulfuric acid solution to obtain a pulpified solution, and the pulpified solution is further subjected to normal-pressure presoaking and pressure leaching to obtain a nickel-copper-enriched leaching solution. The method for enriching the copper and the nickel from the secondary nickel return material of the copper smelting slag meets the requirements of a nickel electrolysis system precursor solution, solves the problems of low metal yield, high production cost, high environmental protection pressure and the like in the traditional pyrogenic treatment process, and has the outstanding characteristics of short production flow, high metal yield, low production cost, energy conservation and environmental protection.

The invention provides a method for preparing a flomoxef intermediate 1, which comprises the step of reacting a compound 3 with selenium dioxide in the presence of an auxiliary agent to obtain the intermediate 1. The method is mild in reaction condition, the molar yield is greater than 65%, the HPLC purity is greater than 98%, and the method has the advantages of being short in route, high in yield, environmentally friendly and suitable for industrial production.