591 results about "Solid acid" patented technology

The invention provides a metal organic sulfonic acid-based solid acid catalyst applied to nylon 6 recovery and depolymerization and a preparation method thereof, and realizes upgrading and recovery of waste nylon 6. The main contents are as follows: (1) a structural design and a preparation method of the metal organic framework sulfonic acid-based solid acid catalyst; and (2) the solid acid is used for catalytic depolymerization of nylon 6. The problems that equipment corrosion is aggravated by inorganic acid in the nylon 6 recovery process and a liquid-phase catalyst is difficult to separate and recover are solved, and the application prospect is good.

The invention relates to the field of caprolactam production, and discloses a green and efficient production process and device. The process comprises the following steps: continuously oximating cyclohexanone and hydroxylamine in a microreactor under the catalysis of mesoporous silica solid acid; carrying out gas phase rearrangement on cyclohexanone-oxime in the presence of a ZSM-5 molecular sieve under the assistance of microwaves; coupling, rectifying and purifying the crude product through a four-stage molecular sieve membrane; and performing catalytic cracking on the by-product to obtain N2 / H2O and recycling. The device comprises a micro-reaction unit, a microwave-radial reactor, a membrane coupling rectifying tower group and a tail gas cracking unit. Zero emission of ammonium sulfate is achieved, the product purity is larger than or equal to 99.95%, and energy consumption is reduced by 45%.

A method of forming a substituted or unsubstituted gamma-lactone includes forming a reaction mixture that includes a substituted or unsubstituted cyano(C4-C10)alkene and / or a hydrolysis reaction product thereof. The reaction mixture also includes an acid, a solid acid catalyst, or a combination thereof. The method includes allowing the reaction mixture to react to form the substituted or unsubstituted gamma-lactone.

The invention relates to the technical field of crystalline porous materials, in particular to a covalent organic framework material and a preparation method and application thereof.The preparation method includes the steps that a tridentate organic ligand monomer, a bidentate organic ligand monomer and a solid acid catalyst are evenly mixed to obtain a mixture, the rotating speed of a double-screw extruder is set to be 5-35 r / min, the temperature is set to be 80-140 DEG C, and the mixture is extruded to obtain a covalent organic framework material; and adding the mixture into a double-screw extruder, heating, kneading, mixing, washing and drying to obtain the COF material. Shear force and heat are provided through a double-screw extruder, a molten reaction monomer is used as a reaction medium, a toxic solvent is not needed, the preparation method is simple, rapid, green and environmentally friendly, the obtained COFs material is high in crystallinity, the COF material is expected to be further processed and formed through a specific extrusion head, continuous large-scale production is achieved, and the method is suitable for industrial production. And the COFs material synthesized by the method disclosed by the invention has good flame retardant property.

The invention provides a BVPE preparation method based on solid acid catalysis and continuous flow reaction, and relates to the technical field of disubstituted ethane preparation, and the method comprises the following steps: mixing a compound 1, a polymerization inhibitor, a solid acid catalyst and a solvent to form a reaction liquid; enabling the reaction liquid to pass through a fixed bed continuous flow reactor, and reacting at 20-180 DEG C for 1-45 minutes to obtain a compound 2; post-treating, separating and purifying a product; wherein the solid acid catalyst is an HZSM-5 type molecular sieve or acidic resin, the product purity and yield are high, the HZSM-5 type molecular sieve or acidic resin is adopted as the solid acid catalyst, residual pollution of traditional protonic acid (such as p-toluenesulfonic acid) is avoided, in embodiments 1-3, the product GC purity reaches 98.6%-99.1%, the yield reaches 88.8%-93.8%, and the product GC purity and the yield are remarkably higher than those of a contrast (the purity is 96.1%, and the yield is 74.2%).

The invention belongs to the technical field of chemical synthesis, and particularly relates to a method for preparing 5-methylfurfural by using 2-methylfuran. The special solid acid catalyst is used for replacing traditional phosphorus oxychloride, hydrogen chloride and phosphorus-containing wastewater are eliminated from the source, and the sulfolane is used for replacing DMF (Dimethyl Formamide), so that solvent residues in the product are reduced. The solid catalyst SO4 < 2-> is modified to form a strong Bronsted acid site (-SO3H) which cooperates with Ce < 3 + > / Ce < 4 + > redox to inhibit carbon deposition, selectively activate 2-methylfuran alpha-C and inhibit side reactions, so that the selectivity and yield of a target product are improved. Na2CO3 neutralization is replaced by electrochemical neutralization, salt slag solid waste is eliminated, and environmental pollution is reduced. After the organic phase is dried and dewatered through a molecular sieve, most of the solvent is removed through rotary evaporation, and the residual crude product is subjected to centrifugal molecular distillation, so that unreacted raw materials and trace impurities are effectively removed, and the product purity is remarkably improved.

The invention discloses a catalytic method for converting alpha-olefin in an alkane-olefin mixture into internal olefin and application, raw materials and a solid acid catalyst are carried out in a fixed bed or a reaction kettle, the reaction temperature is 50-150 DEG C, the reaction pressure is 15-400 psi, and the reaction environment is an inert gas atmosphere; when the reaction is carried out on the fixed bed, the mass space velocity of the solid acid catalyst is 1h <-1 >-20h <-1 >; when the reaction is carried out in the reaction kettle, the conversion frequency of the raw materials is 5000 mol substrate mol acid site density <-1 > h <-1 > to 50000 mol substrate mol acid site density <-1 > h <-1 >; wherein the raw material is an alkane-alkene mixture; the solid acid catalyst comprises an active component and a carrier, wherein the carrier contains at least one inorganic oxide; the active component has a structure as shown in a formula (1) and / or a formula (2), in the formula (1) and the formula (2), R is alkyl or phenyl, and n is greater than or equal to 1. According to the catalysis method provided by the invention, the conversion rate of alpha-olefin can be increased, and the proportion of skeleton isomerization products and oligomers in internal olefin products can be reduced.

The invention discloses a cationic polymer acid-resistant thickening agent as well as a preparation method and application thereof, and belongs to the technical field of oil-gas field development. The polymer thickening agent is prepared from the following components in percentage by mass: 65 to 85 weight percent of acrylamide, 15 to 35 weight percent of methacryloyloxyethyl trimethyl ammonium chloride, 0.01 to 0.05 weight percent of dicationic functional monomer and 1 to 8 weight percent of cosolvent, the acid liquor system comprises the following components in percentage by mass: 5wt%-30wt% of solid acid, 0.01 wt%-0.6 wt% of a cationic polymer acid-resistant thickener, 0.5 wt%-5.0 wt% of a corrosion inhibitor, 0.3 wt%-1.0 wt% of an iron ion stabilizer and the balance of water; wherein the solid acid consists of 5wt%-15wt% of a solid metal catalyst and 85wt%-95wt% of solid particle acid; the acid liquid system has excellent slow release performance, is simple in formula, convenient to transport, low in cost and suitable for site construction, and has wide market prospects.

The invention discloses a solid acid catalyst for synthesizing cyclic peroxide and application of the solid acid catalyst, and belongs to the technical field of catalytic synthesis. The solid acid catalyst has a core-shell structure, and the core-shell structure sequentially comprises the following components from inside to outside: a) a core: ZSM-5 zeolite, the surface of which is grafted with an amino group, and the aperture of which is 0.54-0.58 nm; b) an intermediate layer: a phosphorylated titanium dioxide layer containing Ti-O-P bonds; and c) a shell: a nitrogen-doped sulfonated carbon layer, the surface sulfonic group density is 1.6 mmol / g-1. 8mmol / g, a temperature-sensitive polymer network is grafted in the shell layer, and the tail end of the temperature-sensitive polymer network is modified with a sulfonic group. The problems of harsh reaction conditions, low product purity, poor catalyst stability and insufficient environmental friendliness in the prior art are solved.

The invention belongs to the technical field of fuel cells, and discloses a metal organic framework material with proton conductivity and a preparation method and application thereof. Pyrazolo [3, 4-c] pyridine is used as a ligand, a binuclear cuprous cluster is used as a connection point, a two-dimensional layered structure is constructed through the ligand and the binuclear cuprous cluster, a cuprous multi-nitrogen heterocyclic metal organic framework is formed, the cuprous multi-nitrogen heterocyclic metal organic framework is oxidized, and the cuprous multi-nitrogen heterocyclic metal organic framework is obtained. Divalent copper ions and monovalent copper ions exist in the oxidized cuprous multi-nitrogen heterocyclic metal organic framework, and the metal organic framework material with proton conductivity is obtained. The proton conductivity of the metal organic framework material can be remarkably improved by adopting a metal post-synthesis modification oxidation technology, and the proton conductivity of the metal organic framework material is comparable with that of commercial Nafion, and an oxidized sample shows extremely high chemical stability; the problem of poor stability of a non-fluorinated hydrocarbon polymer proton exchange membrane and inorganic solid acid researched in the prior art is solved.

The invention discloses a method for catalyzing melamino-formaldehyde resin methylation reaction by solid acid. According to the invention, epoxy silane coupling agent grafted modified nanocellulose is introduced into sulfonated styrene-divinyl benzene cross-linked copolymer microspheres for in-situ crystal cross-linking, so that the problems that the traditional sulfonated polystyrene resin is poor in mechanical strength and solution solubility resistance, low in cycle index, easy to swell and fall off and the like are effectively solved; the prepared solid acid resin has the characteristics of high reaction activity, high proton transfer rate, high mechanical strength, high cyclicity and easiness in solid-liquid separation, and by utilizing the solid acid resin to catalyze the etherification reaction of the melamino-formaldehyde resin, the reaction temperature and the production energy consumption are reduced, the reaction time is shortened, the product quality and the production efficiency are improved, and the production cost is reduced. The problems of environmental protection and energy consumption caused by the generation of a large amount of VOCs in the etherification reaction of the traditional liquid catalyst for synthesizing the high-etherified melamine formaldehyde resin and the by-product inorganic salt in the subsequent process are solved.

The application provides an acid ester composite diesel anti-wear agent and a preparation method thereof, and belongs to the technical field of diesel additives, and comprises the following steps: S1, preparing a silanized solid acid catalyst; S2, preparing C18 polyol ester; S3, mixing an acid type anti-wear component and the C18 polyol ester, and then stirring after heating, and then adding tetrahydropyrazole pyridine derivatives and a diluent to continue stirring, and then cooling and filtering to obtain the acid ester composite diesel anti-wear agent. The application can improve the lubricity and anti-wear performance of low-sulfur diesel at a lower additive dosage, and has low corrosion and good oxidation stability.

The invention provides a solid acid catalyst and application thereof in esterification reaction of polyethoxy dihydric alcohol and acrylic acid, and relates to the technical field of preparation of polyethylene glycol diacrylate. The solid acid catalyst is a UIO-66-SO3H catalyst based on a UIO-66 framework, the catalyst is prepared from ZrCl4, formic acid, terephthalic acid and 2-sulfonic acid terephthalic acid through a reaction, the catalyst can catalyze an esterification reaction of polyethyoxyl dihydric alcohol and acrylic acid under the solvent-free condition, a subsequent desolventizing step is avoided, energy consumption is reduced, and the method is suitable for industrial production. And the prepared polyethoxy glycol diacrylate product is colorless and transparent in color, high in purity, low in polymerization degree, moderate in viscosity and wider in application space.

The invention provides a method for preparing isobutanol by directional conversion of methanol and ethanol, which comprises the following steps: by taking methanol and ethanol as raw materials, converting methanol and ethanol into isobutanol under the action of a Cu-doped composite metal oxide catalyst, a precursor of the catalyst is hydrotalcite-like, Cu in the catalyst is dispersed in a carrier in an atomic scale, and the loading capacity of Cu is 0.1-1.5 wt%. The Cu-doped composite metal oxide solid acid-base catalyst designed and prepared by the invention is easy to synthesize, the Cu species are highly dispersed on the oxide carrier, the catalyst has the characteristics of high activity, high selectivity and high stability in the reaction for preparing isobutanol by directional conversion of methanol and ethanol, and under the conditions of 300 DEG C and normal pressure, the conversion rate of ethanol is 99.5%, the selectivity of isobutanol is higher than 60%, and the catalyst is suitable for industrial production. In a 600h stability test, the ethanol conversion rate is greater than 80%, and the C-C coupling product selectivity is greater than 80%; meanwhile, the product is easy to separate, the whole process has economical efficiency and practicability, the sustainable development concept is met, and the method has good industrial application prospects in the field of biomass conversion.

The invention relates to a method for preparing bio-based isosorbide dimethyl ether through resin catalysis, and belongs to the technical field of organic synthesis. Adding corn starch into a sulfuric acid solution, hydrolyzing into glucose, and filtering to obtain a glucose solution; adding a solid acid catalyst into the concentrated glucose solution, and filtering after reaction; carrying out reduced pressure distillation on the filtrate to obtain an isosorbide crude product, and purifying through recrystallization; the preparation method comprises the following steps: adding isosorbide, a methylation reagent and a basic catalyst into a reaction kettle, stirring for reaction, cooling and filtering; and distilling the filtrate, and collecting fractions to obtain high-purity isosorbide dimethyl ether. The solid acid catalyst is sorbic acid based styryl macroporous cation exchange resin; the styryl macroporous cation exchange resin is soaked in sulfuric acid to be activated and then is mixed with sorbic acid chloride, 2-thiophenecarbonyl chloride and zinc chloride to react, and then washing and drying are performed to prepare the solid acid catalyst; the isosorbide dimethyl ether prepared by the method disclosed by the invention is high in purity and relatively high in yield.

The invention relates to the technical field of catalysis, and particularly discloses a method for preparing pure biodiesel from kitchen waste oil through enzyme catalytic desulfurization. The method comprises the following steps: adding a Sm2O3 / ZrO2 solid acid catalyst into the kitchen waste oil for pretreatment to obtain pretreated waste oil, and then adding lipase into the pretreated waste oil for catalyzing transesterification to obtain the biodiesel. According to the method for preparing the pure biodiesel from the kitchen waste oil through enzyme catalytic desulfurization, in-situ esterification and synchronous desulfurization of free fatty acid can be completed in a single-step reaction, the stability of a conversion reaction is effectively improved, the production process is simplified, and the conversion efficiency of preparing the biodiesel from the kitchen waste oil is improved.

The invention relates to the technical field of high polymer material recovery, in particular to a composite catalyst for preparing DMT through PET alcoholysis and a preparation method and application of the composite catalyst. The composite catalyst comprises a solid acid material which is obtained by carrying out proton transfer reaction on silica gel of which the surface is grafted with aluminum alkyl and perfluoroalkyl sulfonic acid of which the general formula is Rf-SO3H, wherein Rf is a perfluoroalkyl group with the carbon atom number of 1-10. Through the synergistic effect of the components, the composite catalyst shows excellent performance in the process of degrading PET (Polyethylene Terephthalate) by monohydric alcohol. When methanol is used as an alcoholysis agent, the yield of the main product dimethyl terephthalate (DMT) can reach 95% or above, the catalytic efficiency is high, the stability is good, an efficient catalyst is provided for industrialization of chemical recovery of PET, and the method has important economic and environmental values.

This invention relates to the field of chemical synthesis technology and discloses a method for preparing 2,5-furandicarboxylic acid from fructose, comprising the following steps: preparing reaction system A containing fructose, an organic bromide, a solid acid catalyst, and water; performing a dehydration reaction to separate the solid acid catalyst and obtain a fructose dehydration reaction solution; preparing reaction system B containing the fructose dehydration reaction solution, a co-oxidant, an oxidation catalyst, and acetic acid; performing an oxidation reaction under an oxidizing gas atmosphere; separating the product to obtain 2,5-furandicarboxylic acid. This invention utilizes a co-oxidant, which can reduce the requirement for fructose concentration in the one-pot preparation of 2,5-furandicarboxylic acid while ensuring the yield and purity of FDCA, thereby improving production efficiency. Furthermore, it reduces or even eliminates the use of hydrobromic acid in the oxidation reaction, thus reducing corrosion to equipment.

The invention belongs to the field of photovoltaic technology, and provides a photovoltaic packaging adhesive film, a preparation method and application thereof, and a recovery method of a photovoltaic module. The photovoltaic packaging adhesive film comprises the following raw materials in specific amounts: matrix resin, a low-temperature cross-linking agent, a low-temperature catalyst, a silane coupling agent, an ultraviolet light stabilizer, an organic peroxide initiator, an assistant cross-linking agent and an alcohol compound serving as a reversible dynamic transesterification reaction group, the matrix resin is EVA (ethylene vinyl acetate), POE (polyolefin elastomer) and / or ethylene-butylene copolymer; the low-temperature cross-linking agent is a carboxylic ester type cross-linking agent, a bisoxazoline type cross-linking agent and / or a metal-organic ligand cross-linking agent with the reaction temperature of 150 DEG C or below; the low-temperature catalyst is a polynuclear metal catalyst, a solid acid resin catalyst, a solid base catalyst and / or a bimetallic MOF derivative catalyst with the reaction temperature of 150 DEG C or below. The adhesive film can realize recycling of the adhesive film and a photovoltaic module in a more efficient and energy-saving manner, is wide in adaptability, and has high crosslinking degree, peel strength and PID resistance.

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.

The invention provides a synthesis method of nonanoic acid-2, 2-dinitropropyl ester, which comprises the following steps: mixing an organic solvent, 2, 2-dinitropropanol, nonanoic acid and a solid acid catalyst, and heating to react; the preparation method of the solid acid catalyst comprises the following steps: mixing and dipping a zirconyl nitrate aqueous solution and microsphere silica gel, separating a solid, carrying out heat treatment on the solid at 80-150 DEG C, soaking the solid subjected to heat treatment in sulfuric acid, and roasting the soaked solid at 400-600 DEG C to obtain the solid acid catalyst. According to the synthesis method of the nonanoic acid-2, 2-dinitropropyl ester, the use of liquid strong acid is avoided, the operation is simple, the corrosion to reaction equipment is reduced, and the solid acid catalyst can be repeatedly utilized.

The present invention provides a method for producing carbon monoxide, which includes a step of generating carbon monoxide by a decomposition reaction of a raw material of at least one of formic acid or a formic acid alkyl ester in the presence of a solid acid catalyst. The solid acid catalyst has a BET specific surface area of 590 m 2 / g or less.

A process for dimerizing and oligomerizing olefins to distillate fuels which utilizes a solid acid catalyst for ethylene oligomerization in a first stage and a metal catalyst for further oligomerization in a second stage. Distillate fuels can be produced from the process. Oligomerized olefins may be recycled to the first stage oligomerization reaction to ensure sufficient oligomerization of smaller olefins.

The present invention belongs to the field of medicinal chemistry, and specifically relates to coumarin-chalcone hybrid derivatives as phosphodiesterase 2 inhibitors and their applications. The present invention expands hybrid derivatives based on the structures of coumarin and chalcone, provides novel small molecule compounds that are inhibitors of PDE2, and the obtained compounds have good PDE2 inhibitory activity. These compounds have the potential to treat central nervous system diseases such as memory defects, cognitive impairments, anxiety, and depression, and can be used as active ingredients to prepare drugs that inhibit the activity of PDE2. Moreover, the preparation is easy, the reaction is rapid, the yield is high, the post-treatment is simple, and the solid acid catalyst left after post-treatment filtration can still be recycled, greatly reducing the reaction time and experimental cost.

The present invention relates to a preparation method and application of a black soldier fly worm sand biomass carbon-based solid acid catalyst. The preparation method comprises the following steps: first, the black soldier fly worm sand is sieved with a sieve, and then the sieved black soldier fly worm sand is added to a sodium hydrosulfide solution and stirred and soaked for several hours. The pretreated black soldier fly worm sand is washed three times with deionized water and dried in an oven for 24 hours. Finally, the pretreated and dried worm sand is pyrolyzed and carbonized at high temperature in a nitrogen atmosphere for several hours to obtain a biochar-based solid acid catalyst material. The present invention uses biomass worm sand as raw material, which is cheap and easily available, reduces the production cost of solid acid catalysts and biodiesel, and improves the utilization value of renewable resources. In the present invention, the carbon-based material is pretreated with a sodium hydrosulfide solution, which not only improves the acid catalytic activity of the catalyst, but also improves the pore structure of the catalyst, thereby improving the catalytic activity of the carbon-based material as a whole, and is expected to become a highly competitive clean process route.

The present disclosure provides a catalyst for SRO reaction. The catalyst comprises a solid acidic substance and a metal. In this case, at least 20% of the total pore volume of the catalyst corresponds to pores of the catalyst having a pore diameter of 10 nm or more. The present disclosure also provides a method using the catalyst.

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 preparation and by-product recycling process of acesulfame potassium, and belongs to the technical field of food additive production and processing. Amino sulfonic acid is added into N-butyl pyridine hydrogen sulfate ionic liquid and triethylamine in batches to obtain a homogeneous mixed solution; secondly, the mixed solution and diketene are introduced into a micro-channel reactor to perform a condensation reaction; and the discharge liquid is introduced into a polystyrene sulfonic acid resin loaded SO3 fixed bed reactor to perform a cyclization reaction; subsequently, the cyclization product is subjected to hydrolysis, decolorization, potassium salt crystallization and drying to obtain the acesulfame potassium product; and the crystallization mother liquor is separated through a nanofiltration membrane, and the intercepted liquid is an ionic liquid and triethylamine mixture, which is directly reused. The application inhibits the self-polymerization of diketene through the micro-channel reactor, replaces concentrated sulfuric acid with solid acid to avoid waste acid pollution, and realizes efficient recycling of by-products by combining nanofiltration membrane separation and catalytic depolymerization technology, and has the characteristics of green environmental protection and economic efficiency.

The invention provides a preparation method and application of a solid acid catalyst for cyclohexanone-oxime gas phase rearrangement, and the method comprises the following steps: in the presence of a solvent, mixing and stirring a silicon source, an amine modifier and an activator for reaction; mixing the obtained reaction liquid with an acid treatment agent, and stirring while keeping the temperature; after heat preservation is finished, adding a strong acid modifier, continuously sealing, preserving heat and stirring, and after heat preservation is finished, evaporating the solution to dryness to obtain a catalyst precursor; and roasting the catalyst precursor to obtain the strongly acidic solid acid catalyst. The catalyst has good catalytic performance in the reaction process of preparing caprolactam through cyclohexanone-oxime gas phase rearrangement, the cyclohexanone-oxime conversion rate is high, caprolactam selectivity is high, impurities are few, the service life of the catalyst is long, generation of ammonium sulfate in a traditional technology is avoided, economic benefits are good, cost is low, and the catalyst is environmentally friendly.