84 results about "Solid acid" patented technology

The application provides a synthesis method of p-benzoquinone dioxime. The synthesis method comprises the following steps: (1) adding solid acid into an ethanol solution of phenol to obtain a mixed solution A, then vacuumizing and filling with inert gas; dissolving nitrite into ethanol, uniformly mixing to obtain an ethanol solution of nitrite, then vacuumizing and filling with inert gas; in an inert gas atmosphere, adding the ethanol solution of nitrite into the mixed solution A dropwise to perform nitrosation reaction, to obtain a reaction liquid B; in the inert gas atmosphere, adding an ethanol solution of hydroxylamine into the obtained reaction liquid B to perform oximation reaction; after the reaction is completed, filtering the obtained reaction liquid C, performing reduced pressure distillation on the obtained filtrate, and performing washing, filtering and drying on the obtained residual liquid of the reduced pressure distillation, to obtain p-benzoquinone dioxime. The method provided by the application reduces the occurrence of side reactions, improves the conversion rate of the reaction, and improves the yield and purity of p-benzoquinone dioxime.

This invention belongs to the field of catalyst technology, specifically relating to a solid acid catalyst, its preparation method, and its application. The invention provides a method for preparing a solid acid catalyst, comprising the following steps: mixing a dichlorohydrin solution, N-methylpyrrolidone, and silica sol, and sequentially aging and calcining them to obtain a ZrO2-SiO2 support; mixing the ZrO2-SiO2 support with a sulfuric acid solution, and sequentially impregnating and calcining them to obtain the solid acid catalyst. The preparation method provided by this invention, through a sequential sol-gel method and sulfuric acid solution impregnation, prepares SO4 with uniform size and dispersion. 2‑ The ZrO2-SiO2 solid acid catalyst has widely available and low-cost raw materials, and its preparation process is safe and easy to control, allowing for large-scale production. Furthermore, the obtained solid acid catalyst exhibits excellent performance in treating tail gas from acetylenic diol production, making it suitable for the industrial production of acetylenic diol.

The application discloses a method for preparing carboxylic acid from olefin and its alcohol, and belongs to the field of catalytic synthesis. The method comprises the following steps: contacting raw material gas containing olefin and its alcohol, CO and a solid acid catalyst, and reacting to obtain carboxylic acid; the olefin and its alcohol are selected from at least one of C4-C8 olefin and C4-C8 alcohol; and the solid acid catalyst comprises a zeolite molecular sieve. The method can efficiently and stably obtain carboxylic acid, in particular, the product carboxylic acid has high selectivity, and correspondingly, the energy consumption of production and separation is low, and the method has wide application prospect. Compared with the prior art, the catalyst is safe, green and stable; the catalyst can be regenerated repeatedly without obvious decrease in activity; the catalyst has low production cost, few processing steps and low three-waste discharge.

The application discloses a method for efficiently preparing 1,4-anhydro mannitol, comprising the following steps: mixing bio-based mannitol, a ketone compound and a solid acid catalyst in a reactor to generate a dehydration reaction, hydrolysis, crystallization, and obtaining 1,4-anhydro mannitol; by introducing a ketone compound as a ketal reagent, and through environment-friendly solid acid catalysis, 1,4-position selective dehydration of mannitol is realized, and 1,4-anhydro mannitol ketal and monodehydration mannitol by-product are easy to separate, and the product separation process is simplified. The efficient preparation method of 1,4-anhydro mannitol provided by the application simultaneously solves the problems of low selectivity of 1,4-anhydro mannitol and difficult product separation, and opens up a new route for the preparation of 1,4-anhydro mannitol.

The invention discloses a sulfur-tolerant platinum-based catalyst and a preparation method thereof, and the preparation method of the sulfur-tolerant platinum-based catalyst comprises the following steps: weighing roasted ZrO2 as a carrier, weighing ammonium metatungstate, completely dissolving in deionized water, dropwise adding the solution until the carrier is completely immersed, and carrying out ultrasonic treatment; standing at room temperature, drying, and roasting in air at 500-600 DEG C to prepare a tungsten oxide loaded solid acid composite carrier WO3-ZrO2; and weighing chloroplatinic acid, completely dissolving the chloroplatinic acid in deionized water, dropwise adding the solution into the composite carrier, completely immersing the composite carrier, carrying out ultrasonic treatment, standing at room temperature, drying, and roasting in air at 250-350 DEG C to obtain the sulfur-tolerant platinum-based catalyst. The catalyst is simple in preparation method, has relatively strong tolerance to different sulfur species, and has good low-temperature catalytic performance and catalytic stability to low-carbon alkane.

The present application relates to the technical field of fluorinated chemical industry, and particularly relates to a method for removing perfluoroisobutene in mixed gas, comprising the following steps: passing the mixed gas containing perfluoroisobutene through a perfluoroisobutene absorption membrane to remove perfluoroisobutene therein; wherein the perfluoroisobutene absorption membrane comprises a perfluoroisobutene absorbent, the perfluoroisobutene absorbent comprises solid alcohol and solid acid, and the mass ratio of the solid alcohol to the solid acid is (70-95):(5-30). The method can completely absorb perfluoroisobutene in the mixed gas, the crude cracking gas generated in the process of producing hexafluoropropylene by thermal cracking is treated by the method, the perfluoroisobutene removal effect is good, the cracking gas is not polluted, no additional purification operation is needed, the utilization rate of the absorbent is more than 90%, and the method has good popularization and application value.

A method for manufacturing of porous polymer structures, in particular membranes, the method comprising the steps of providing a mixture of one or more polymers and one or more salt nano- and / or microparticles, primary shaping said blend, and removing said one or more salt particles, wherein at least part of the one or more salt nano- and / or microparticles is one or more solid acids, and whereby the ratio of polymer-to-particle is in the range of 3:1 to 1:10 by weight. Also provided are mixtures suitable to obtain such porous polymer structures, porous polymer structures as described herein, shaped articles containing such structures, and the use of such porous polymer structures, shaped articles and mixtures.

This invention discloses a mesoporous silica-based composite material with phosphotungstic acid simultaneously immobilized with titanium oxide and its cellulose hydrolysis method, belonging to the field of biomass catalytic conversion technology. This invention aims to solve the problems of easy desorption of active components, low catalytic efficiency, and poor cycle stability in existing solid acid catalysts during cellulose hydrolysis. This method uses an ionic liquid as the reaction medium and a titanium-silicon-supported phosphotungstic acid composite material with a two-dimensional hexagonal ordered mesoporous structure prepared by a one-step hydrothermal synthesis as the solid acid catalyst, catalyzing the hydrolysis of cellulose to reduce sugars in the presence of water. This invention achieves highly efficient cellulose conversion through the synergistic catalytic effect of the two acid sites combined with the good solubility of cellulose in the ionic liquid. The catalyst exhibits excellent recyclability, the process conditions are well-defined, it meets the requirements of green chemistry, and it is applicable to the field of biomass resource utilization.

This invention provides a solid acid catalyst comprising a divinylbiphenyl polymer as a backbone and a sulfonate group as an active center; wherein the divinylbiphenyl polymer comprises substituted or unsubstituted divinylbiphenyl monomer structural units and optionally substituted or unsubstituted divinylbenzene monomer structural units; in both the substituted or unsubstituted divinylbiphenyl monomer structural units and the substituted or unsubstituted divinylbenzene monomer structural units, the substituents are each independently C1-C5 alkyl groups. This invention selects suitable polymeric monomers and polymerizes them to obtain a polymer backbone with a stable backbone structure and a large specific surface area; after sulfonation, the backbone structure is maintained, and the resulting catalyst has a stable acid active center.

This utility model relates to the field of organic synthesis technology, and discloses a high-purity cyclopentyl methyl ether etherification reaction production device, comprising a base and a controller. The controller is located on the left side of the top of the base, and a mixing tank is fixedly connected to the top of the base. A pump body is installed on the right side of the mixing tank, with a drain pipe fixedly connected to the top of the pump body and a suction pipe fixedly connected to the bottom of the pump body. A second valve is fixedly installed on the outside of the suction pipe. This high-purity cyclopentyl methyl ether etherification reaction production device, through the inclusion of a reactor shell and other components, uses an inlet to add 570 mL of spherical strong acidic cationic catalyst with a particle size of 0.8-1.0 mm. The product material is directly fed into a distillation column for separation. The temperature of the distillation column bottom is controlled at 75-90℃. The cyclopentyl methyl ether and methanol mixed solution collected from the column has a purity greater than 99%. The solid acid catalyst replaces the liquid acid, solving the problems of strong corrosiveness of catalysts (such as concentrated sulfuric acid) and complex subsequent processing.

The application discloses a kind of low ring body hydrogen-containing silicone oil and preparation method thereof, belong to the technical field of silicone material.The preparation method includes: preparation gradient acid strength core-shell solid acid catalyst;Siloxane raw materials are mixed, and the raw material mixed solution is obtained by dehydration and deoxidation pretreatment;The catalyst is loaded in fixed bed reactor, and the raw material mixed solution is continuously introduced to carry out ring-opening polymerization reaction;Reaction effluent is continuously sent into thin film evaporator, first remove unreacted monomer, then remove ring body and low boiling point substance, collect the product at the bottom of kettle, i.e.low ring body hydrogen-containing silicone oil.The application designs a kind of gradient acid strength core-shell solid acid catalyst, the core is sulfated zirconium oxide, shell is 2-3nm mesoporous SiO2.Limited effect is used in pore, and the limited ring-opening polymerization of cyclosiloxane is realized in fixed bed reactor, chain back-bite into ring is inhibited from space.Combination continuous thin film evaporation separates product in time, so that ring body content is lower than traditional scheme.

The application discloses a method for preparing methyl isobutyrate by propylene carbonylation, and belongs to the field of catalytic chemistry. The method comprises the following steps: feeding raw materials containing propylene, carbon monoxide and methanol into a reactor loaded with a solid acid catalyst, and reacting under predetermined reaction conditions to obtain a product containing methyl isobutyrate. The application provides a new method for preparing methyl isobutyrate by propylene carbonylation with the solid acid catalyst. The method for preparing methyl isobutyrate has the advantages of cheap and easily obtained raw materials, small corrosion of the system, easy separation of the product, less discharge of three wastes, easy engineering of the fixed bed process, and suitability for single large-scale production.

The application discloses a method for preparing energy storage type lignin micro / nano spheres with controllable morphology, and mainly relates to preparation of lignin spherical micro / nano spheres in a solid acid solvent-water system. By controlling reaction conditions such as solid acid concentration, reaction temperature and reaction time, the purpose of controllable morphology and size can be achieved, and the prepared lignin micro / nano spheres have excellent electrochemical performance and good energy storage performance. The method can realize efficient separation of lignin from wood fiber raw materials at low temperature and normal pressure, and can directly prepare microspheres in the lignin recovery process. Compared with conventional methods, the preparation method is simple, the yield is high, and large-scale preparation of lignin microspheres with controllable size can be realized. The chemical modification of lignin and the use of high-toxicity chemical reagents are avoided, cost is saved, environmental pollution is reduced, and the method has good practicability.

This invention discloses a method for the catalytic hydrogenation of bio-based small molecule diols to prepare monohydric alcohols. The method includes the following steps: placing an aqueous solution of a bio-based small molecule diol in a high-pressure reactor, adding an activated carbon-supported metal catalyst and a solid or liquid acid, then introducing hydrogen gas at a certain pressure, and stirring the reaction at a certain temperature for a period of time to obtain the monohydric alcohol; the small molecule diol is one of ethylene glycol, 1,2-propanediol, 1,4-butanediol, 1,2-pentanediol, 1,5-pentanediol, and 1,2-hexanediol; the activated carbon raw material is widely available, easy to prepare, and recyclable. The catalyst preparation process is simple, reusable, inexpensive, has high catalytic activity, and the reaction conditions are relatively mild, making it easy to promote.

This invention discloses a highly efficient method for synthesizing cyanuric acid in the field of green chemistry and chemical engineering. The method uses urea as a raw material and reacts it in a decahydronaphthalene solvent under the catalysis of a phosphotungstic acid-confined three-dimensional ordered macroporous alumina solid acid catalyst. Specifically, urea, solvent, and catalyst are mixed and heated under nitrogen protection. After cooling, filtration, and solvent washing, the resulting filter cake is separated from the crude product by stirring with hot water. The separated catalyst is dried and can be recycled. The filtrate containing the product is cooled, crystallized, filtered, washed, and dried to obtain high-purity cyanuric acid. The catalyst used in this method is prepared using a template method and confinement technology, exhibiting a stable structure and significantly inhibiting the loss of active components. This invention features a simple and efficient process, easy catalyst recovery and recycling, and high product yield and purity, demonstrating promising prospects for industrial application.

The application discloses a preparation method of diphenyl 2,4,6-trimethylphenyl sulfonium trifluoromethanesulfonate. Diphenyl sulfoxide, trifluoromethanesulfonic acid and mesitylene are used as starting materials, and diphenyl 2,4,6-trimethylphenyl sulfonium trifluoromethanesulfonate is generated through reaction under the catalysis of trifluoroacetic anhydride and solid acid, and then the crude product is obtained through liquid separation and concentration, and then the product is obtained through washing and second concentration. The mass ratio of the diphenyl sulfoxide, trifluoromethanesulfonic acid, mesitylene, trifluoroacetic anhydride and solid acid is 1:0.8-1.0:0.7-0.9:2.0-3.0:0.3-0.5. The reaction needs to be carried out in an organic solvent system. The product has high purity, the content of metal impurities can be controlled below 60 ppb, there is only one impurity under liquid phase condition, and the product can fully meet the use requirements as an electronic chemical raw material.

This invention discloses a synthesis process for methylal, belonging to the field of methylal technology, comprising the following steps: In a reactor, formaldehyde and methanol are reacted at a molar ratio of 1:1.5-4.5 under the action of an organic-inorganic composite solid acid catalyst at 50-75°C for 40-240 min, with the reflux ratio controlled at 1-4:1, and the fraction collected at 40-46°C from the top of the column to obtain industrial-grade methylal product; the organic-inorganic composite solid acid catalyst is phosphotungstic acid supported on multi-component mesoporous microspheres grafted with sulfonic acid-based acrylamide. The methylal synthesis process provided by this invention uses an organic-inorganic composite solid acid catalyst to synthesize industrial-grade methylal. This organic-inorganic composite solid acid catalyst is easy to separate from the product, has low corrosiveness to equipment, high catalytic effect, wear resistance, and good recyclability, making it a novel, efficient, green, and environmentally friendly production method.

The present application relates to a preparation method of a semi-coke wastewater oil removal agent, which comprises the following steps: modifying the lipophilicity of solid acid, and compounding the modified lipophilic solid acid with a silicic acid hydrosol to prepare the semi-coke wastewater oil removal agent. The present application utilizes the acidic point of the solid acid to reduce the pH of the wastewater, realizes acidification demulsification, changes the state of the emulsified oil, and utilizes the lipophilicity of the modified solid acid to form the aggregation center of the oil after demulsification, so that the oil remains stable. Then, the adsorption and flocculation of the silicic acid hydrosol are utilized to assist the rapid precipitation separation of the solid acid after oil removal, and the oil and suspended matters are removed twice. In addition, the solid acid has a large specific surface area and rich pore structure, and has a certain adsorption effect on the organic pollutants in the wastewater, so that the pollutant concentration in the wastewater can be reduced during oil removal.

This invention provides an environmentally friendly UV ink and its preparation method, belonging to the field of UV ink preparation technology. This application constructs a rigid bio-based spirocyclic acetal framework using vanillin / pentaerythritol. After solid acid catalytic dehydration and filtration, the water is removed to reduce acid residue side reactions. An excess of isocyanate is then used for end-capping to obtain a terminal isocyanate-based prepolymer, transforming the framework into a quantitatively functionalized polyurethane platform. Through bifunctional end-capping, the carbonyl-containing photosensitive structure and the hindered tertiary amine synergy are covalently locked. Intramolecular hydrogen abstraction / electron transfer efficiently generates active free radicals, reducing the migration sources of external small molecule initiators / amines. Simultaneously, acrylic double bonds are introduced to provide the main crosslinking sites. The fully esterified latent ionization fragment remains hydrophobic and water-resistant during use, and during recycling, it is saponified in an alkaline hydrothermal solution to generate carboxylate, promoting ink film swelling, fragmentation, and dispersion. These three factors synergistically achieve a unified approach of low migration compliance, stability during use, and triggering deinking during recycling.

The application discloses a silicon-zirconium super strong solid acid catalyst for synthesizing ethylene glycol by one-step method of synthesis gas, a preparation method and application, and belongs to the technical field of catalytic chemistry. The preparation method comprises the following steps: placing a mixed solution containing a zirconium source, a template agent I and ethanol in a closed container, pre-crystallizing, and obtaining a zirconium source gel; slowly adding a mixed solution containing a silicon source, a template agent II, acid and water to the zirconium source gel under stirring, obtaining a mixed gel, placing the mixed gel in a closed container, hydrothermally crystallizing, washing and drying the hydrothermally crystallized product, and then roasting to obtain a silicon-zirconium super strong solid acid catalyst, and further metal modification can be continuously carried out. The catalyst prepared in the application can realize one-step continuous preparation of ethylene glycol by using water, hydrogen and carbon monoxide as raw materials in a fixed bed reactor.

The present application relates to a kind of perfluorosulfonic acid type solid acid and its metal load catalyst and its preparation method and application.Belong to solid acid catalyst technical field.The catalyst includes at least one perfluorosulfonic acid resin, at least one carrier and optional metal salt or metal precursor;Wherein, perfluorosulfonic acid resin content accounts for 5-35 wt% of the total mass of catalyst, and the loading of metal salt or metal precursor is 0-5 wt%;Carrier particle has 5-20 nm mesoporous pore size, and ≥0.6 cm3 / g of pore volume and 500-1000 m2 / g of specific surface area.The catalyst described in the present application shows excellent catalytic activity and higher reaction selectivity in the isomerization of olefins and other reactions, long catalytic life, can maintain high activity under mild conditions, and is easy to regenerate, with good industrial application prospect.

This invention discloses a composite high-temperature proton exchange membrane for fuel cells, its preparation method, and its applications. The raw materials for this composite high-temperature proton exchange membrane include polyethersulfone (PES), polyvinylpyrrolidone (PVP), and phosphate-type solid acids; the phosphate-type solid acids include dihydrogen phosphate and pentahydrogen phosphate. This invention uses two phosphate-type solid acids to prepare the composite membrane. Compared to doped membranes with only dihydrogen phosphate or pentahydrogen phosphate added, the addition of dihydrogen phosphate increases the operating temperature of the pentahydrogen phosphate-doped membrane, and the addition of pentahydrogen phosphate increases the proton conductivity of the dihydrogen phosphate-doped membrane. Due to its high conductivity and the absence of phosphate loss, the composite membrane of this invention results in a battery with superior performance and lifespan.

The present application belongs to the field of pesticide pollution remediation, and provides a preparation method of modified biochar, comprising the following steps: (1) preparing an alkali solution with a certain volume; (2) weighing plant starch and stirring and dispersing the starch in the alkali solution to obtain a starch dispersion liquid; (3) mixing a crosslinking agent with the remaining alkali solution, and then adding the mixture into the starch dispersion liquid dropwise, and stirring and reacting under constant temperature to obtain a reaction liquid; (4) adding soluble iron salt and alkaline potassium salt into the reaction liquid in sequence, and continuing to stir and react to obtain a mixture; (5) drying the obtained mixture to form a solid; and (6) placing the dried solid into a tube furnace, and pyrolyzing and carbonizing the solid under a nitrogen atmosphere at high temperature, and then performing acid pickling and drying to obtain starch-based modified biochar. The starch-based modified biochar prepared through chemical crosslinking modification and metal salt loading synergistic modification is suitable for remediation of long-acting herbicide contaminated water bodies and soil, and also has the effect of improving soil acidity.

The application discloses a kind of strong adhesion high water-retention forest and prairie chitosan-based gel fire extinguishing agent and application thereof, belong to gel fire extinguishing agent technical field.The chitosan-based gel fire extinguishing agent provided in the application includes two components A and B, wherein component A is a mixture containing carboxymethyl chitosan-based compound, solid acid, preservative and water;Component B is a mixture containing water-retaining agent, crosslinking agent, inorganic filler, flame retardant and water.The chitosan-based gel fire extinguishing agent has the advantages of low component viscosity, high adhesion, strong water-retention, and the biological material used is biodegradable, making it have the advantage of green environmental protection.The gel fire extinguishing agent provided in the application can quickly and uniformly cover the surface of combustible materials in the form of gel at room temperature, has strong adhesion, can effectively avoid loss, and also has excellent fire extinguishing efficiency and anti-reignition ability, providing a new method for forest fire prevention, and has promotional value.

The application provides a catalyst for preparing a binary fatty nitrile through direct aminolysis nitrilation of a dicarboxylic acid ester, a preparation method and application of the catalyst, the catalyst comprising a carrier full-silicon molecular sieve and a metal oxide active component loaded on the carrier. The application provides a molecular sieve supported metal oxide type solid acid catalyst with dispersed active sites and high space-time yield of binary fatty nitrile and mild reaction conditions, which is applied to catalyze the preparation of a binary fatty nitrile, has mild reaction conditions, reduces production energy consumption, improves the dispersity and utilization rate of the active sites of the catalyst, has high space-time yield of the binary fatty nitrile, and reduces the theoretical design size of a reactor.

This invention belongs to the field of solid acid catalyst preparation, and specifically discloses an aqueous-phase stable cadmium-based catalyst for aldose isomerization reactions and its applications. The catalyst preparation method includes obtaining a supported cadmium-based catalyst using a precursor calcination method, precipitation method, or supported method. The obtained catalyst powder is applied to the isomerization reaction of sugars (especially xylose) in an aqueous phase, with a catalyst-to-sugar mass ratio of 1:1 to 1:50, and the reaction is carried out at 80℃ to 150℃ for 10 to 240 minutes. After the reaction, the catalyst can be recovered by centrifugation, and the reaction solution can be purified by ion exchange resin to remove cadmium and concentrated by evaporation to obtain a high content of isomerized products. The catalyst of this invention exhibits good stability, high efficiency, and reusability in aqueous phase reactions, and can be applied to the isomerization of other sugars such as glucose, mannose, and ribose.

This invention discloses a method for preparing dioctyl terephthalate (DOTP) from polyethylene terephthalate (PET), comprising: crushing, washing, and drying waste PET to obtain PET particles; depolymerizing the obtained PET particles in the presence of ethylene glycol and a composite depolymerization catalyst to obtain a depolymerization product; adding the obtained depolymerization product to octanol and a transesterification catalyst for transesterification reaction; after the reaction is completed, post-treatment yields dioctyl terephthalate; wherein the composite depolymerization catalyst is a mixture of zinc oxide and germanium dioxide; and the transesterification catalyst is a supported solid acid catalyst. This invention features high raw material utilization and good environmental performance, using waste PET as raw material to prepare DOTP via transesterification reaction, thus solving the pollution problem of waste PET; simultaneously, ethylene glycol, octanol, and the catalyst can be recycled during the reaction, reducing raw material consumption and wastewater.

The application discloses a method for preparing methyl valerate by butene carbonylation, and belongs to the field of catalytic chemistry. Raw materials containing butene, carbon monoxide and methanol are introduced into a reactor loaded with a solid acid catalyst, and a product containing methyl valerate is obtained through reaction. The application provides a new method for preparing methyl valerate by butene carbonylation with a solid acid catalyst. The method for preparing methyl valerate has the advantages of cheap and easily obtained raw materials, small corrosion of the system, easy separation of the product, less waste discharge, easy engineering of the fixed bed process, and suitability for single large-scale production.