440 results about "Solid acid" patented technology

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%.

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 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 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 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 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 discloses an epoxy-ring-opening bifunctional catalyst and a preparation method and application thereof, and belongs to the technical field of catalyst materials and biomass chemical engineering, the catalyst takes a mesoporous molecular sieve SBA-15 as a carrier, tungsten and molybdenum active components are combined with an aluminum-doped silicon-based framework through co-assembly and a hydrothermal method, and the mesoporous molecular sieve SBA-15 is prepared into the epoxy-ring-opening bifunctional catalyst. The total loading amount of tungsten and molybdenum is 10wt% of the mass of a silicon source, the molar ratio of W to Mo is (3: 7)-(7: 3), and the molar ratio of silicon to aluminum is (10-30). The preparation method comprises the following steps: self-assembly of a template agent, co-hydrolysis of a silicon-aluminum source and a tungsten-molybdenum source, hydrothermal crystallization, temperature programming calcination and the like. The catalyst is applied to preparation of biomass polyol from methyl vegetable oleate by one-pot epoxy-ring opening, and epoxidation and ring opening reactions are simultaneously realized under mild conditions. The polyol obtained by the invention has the characteristics of low viscosity, low acid value and high hydroxyl value.

The invention discloses a method for catalyzing hydrolysis of hexafluorophosphate radicals by using a bifunctional solid acid material, the main active sites of the bifunctional solid acid material in the method are a Brnsted acid site formed by combining protonated sulfate radicals (HSO4 <->) with hydroxyl groups on the surface of TiO2 and a Ti < 4 + > (Lewis acid) site enhanced by induction of the Brnsted acid site, and in the catalytic hydrolysis process, the Brnsted acid site and the Ti4 < + > (Lewis acid) site can be used for catalyzing hydrolysis of the hexafluorophosphate radicals by using the bifunctional solid acid material. Ti4 < + > (Lewis acid site) generates strong adsorption and activation effects on PF6 <->, adjacent HSO4 <-> (Brnsted acid site) and PF6 <-> generate H.. F-P interaction, and the two sites apply a synergistic stretching effect on a P-F bond from different directions, so that a stable regular octahedron structure of PF6 <-> is greatly damaged, a reaction energy barrier of P-F bond breakage is remarkably reduced, efficient hydrolysis of PF6 <-> is realized, and the reaction time is shortened. The method has the advantages that the hydrolysis efficiency is high, the hydrothermal stability is good, extreme acid and alkali environments are not needed, the bifunctional catalyst is easy to regenerate and the like, and a brand new technical path and a solution are provided for harmless treatment of the hexafluorophosphoric acid-containing wastewater.

The invention relates to the field of acidic copper plating intermediates, in particular to a solid acid catalyst, a preparation method and a method for preparing an acidic copper plating intermediate 2-sulfydryl-4, 6-dimethyl pyrimidine by applying the solid acid catalyst. The invention relates to a solid acid catalyst for preparing an acidic copper plating intermediate 2-mercapto-4, 6-dimethyl pyrimidine, which comprises a porous carbon material loaded with p-toluenesulfonic acid. The p-toluenesulfonic acid is loaded by taking the porous carbon material as a carrier, abundant loading sites are provided for the p-toluenesulfonic acid, and the acidic active components are uniformly dispersed, so that the contact efficiency of a catalytic reaction is enhanced. Compared with the traditional liquid acid catalyst, the solid acid form can realize the separation of the catalyst and the product through simple filtration, thereby avoiding the corrosion of the liquid acid to equipment and the subsequent complex separation steps such as neutralization and extraction, and obviously reducing the process cost and environmental load. Meanwhile, the loss of active components can be reduced due to the chemical stability of the porous carbon material, and a foundation is laid for recycling of the catalyst.

The present invention relates to the technical field of organic synthesis. Disclosed is a method for synthesizing allyl alcohol. The synthesis method comprises the following steps: adding a water-soluble acid-resistant high-boiling-point organic solvent to an aqueous allyl acetate solution and stirring the mixture to form a homogeneous solution; then heating the homogeneous solution, and performing a hydrolysis reaction under the action of a solid acid catalyst to obtain a mixture solution containing allyl alcohol; and then distilling the mixture solution to separate out the high-boiling-point organic solvent to obtain a crude allyl alcohol product. The synthesis method provided by the present invention can significantly improve the single-pass hydrolysis conversion rate of allyl acetate at low costs and achieve efficient and continuous industrial production of allyl alcohol. Moreover, the method can realize the separation of allyl alcohol from the high-boiling-point organic solvent simply by means of a simple distillation separation process. The separated organic solvent has high purity and light color and can be reused. The method has no waste liquid and waste residue generated.

The invention discloses an electrochemical polishing solution for laser additive manufacturing of a tantalum material and a preparation method and process, and relates to the technical field of surface treatment of metal workpieces. According to the electrochemical polishing solution, an alcohol-salt system is adopted for electropolishing treatment, and compared with a traditional electropolishing solution, the electrochemical polishing solution has the advantages of electrochemical and chemical stability, relatively high conductivity, relatively high controllability, relatively low toxicity, low volatility, environment friendliness and the like; the electropolishing solution has the characteristics of no volatilization, no odor, low toxicity to a human body and the like by adding the inorganic solid acid formed by replacing sulfamic acid sulfuric acid hydroxyl with amino, and not only has the oxidation capacity of sulfuric acid, but also can promote dissolution and improve the material removal rate by the amino; the electrochemical polishing solution is mild in process parameter, insensitive to temperature, capable of implementing polishing at room temperature, small in corrosion to electrolysis equipment and capable of being used for a long time.

The application discloses a method for efficiently separating and utilizing whole components of wood fiber raw materials, and belongs to the field of wood fiber raw material utilization. The application utilizes a binary solid acid-water solvent system composed of dilute sulfuric acid and salicylic acid to pretreat wood fiber raw materials, so that hemicellulose and lignin in the wood fiber raw materials can be effectively removed at a lower pretreatment temperature, the specific surface area and porosity of the raw materials are improved, and the materials are easy to be hydrolyzed by cellulase, and the materials can be prepared into wood nanofibers after treatment; hemicellulose dissolved in the reaction solution is prepared into furfural through dehydration reaction; and the reaction solution can be recovered into lignin by simple water dilution. Through the combined use of the two groups of solid acids, the lignin is not only effectively separated from the raw materials under the mild conditions, but also selectively degraded hemicellulose, and the lignin is protected, so that the utilization rate of the three components of the wood fiber raw materials is effectively improved.

The invention relates to a biomass low-temperature carbonization accelerant as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out water washing pretreatment on powder obtained by crushing a biomass raw material, and then carbonizing in an inert atmosphere to obtain biomass carbon powder; acidizing the biomass carbon powder to obtain carbon-based solid acid; the carbon-based solid acid and a transition metal salt auxiliary agent are mixed and ground, and the biomass low-temperature carbonization accelerant is prepared. The biomass low-temperature carbonization accelerant is a composite catalyst composed of carbon-based solid acid and transition metal salt; wherein the carbon-based solid acid is used as a main catalytic substrate, provides abundant Bronsted acid loci-SO3H, and is mainly used for catalyzing the dehydration reaction of biomass; transition metal ions are used as Lewis acid sites and generate a synergistic effect with the carbon-based solid acid to jointly catalyze depolymerization, dehydrogenation and aromatization reactions, so that deep carbonization can be initiated and completed at a relatively low temperature of 250-400 DEG C, and the carbonization rate is remarkably higher than that of an existing carbonization catalyst.

The present application relates to the production field of organic chemical raw material cyclohexene, and discloses a production method of cyclohexene.The method comprises the following steps: carrying out cracking reaction on cyclohexylbenzene and / or dicyclohexylbenzene raw material and a solid acid catalyst to obtain cyclohexene and benzene; and the solid acid catalyst is selected from at least one of amorphous silicon aluminum, molecular sieve and solid supported inorganic acid.The method has the advantages of high raw material conversion rate, high cyclohexene yield and no by-product cyclohexane, etc.

The invention relates to a preparation method of a catalyst for preparing 1-hexyl methyl acetate by addition of n-heptene and acetic acid, which comprises the following steps: impregnating a carrier sulfonic acid group strong acid resin into a heteropoly acid solution, stirring at 20-50 DEG C for 8-24 hours, and controlling the mass ratio of the sulfonic acid group strong acid resin to the heteropoly acid solution to be (10: 1)-(1: 3); and after stirring, filtering, and drying a solid obtained after filtering at 80-140 DEG C to obtain a finished product. The invention also provides a synthetic method for synthesizing 1-hexyl methyl acetate by using the catalyst. The supported solid acid catalyst can be recycled from reaction slurry through simple liquid-solid separation means such as filtration and centrifugation, and good product selectivity can be obtained.

The invention provides a continuous production device and method of volatile dimethyl silicone oil, continuous production of the volatile dimethyl silicone oil is realized, the problem of low one-way yield is solved, and the method comprises the following specific steps: S1, vaporizing a dimethyl siloxane ring body and hexamethyldisiloxane through a vaporizer to obtain a gas-phase mixture; s2, introducing the gas-phase mixture into a reaction tower, and generating a dimethyl silicone oil mixture from the gas-phase mixture under the action of a solid acid catalyst; s3, short-chain volatile dimethyl silicone oil in the dimethyl silicone oil mixture is pulled out from the tower top, and a volatile dimethyl silicone oil mixture is obtained; enabling long-chain liquid-phase dimethyl silicone oil to fall into a tower kettle, heating the long-chain liquid-phase dimethyl silicone oil through a reboiler, reentering the reaction tower, and continuously reacting with the gas-phase mixture obtained in the step S1; and S4, further separating the volatile dimethyl silicone oil mixture obtained in the step S3 to obtain MDM, MD2 M and MD3M, and returning the residual MM and dimethyl siloxane ring bodies to the step S1 for recycling.

The present invention provides a solid acid alkylation catalyst and its preparation method and use, the preparation method includes the steps of: S1: mixing aluminum source, water, alkali source, template agent, silicon source and seed crystal to form gel, carrying out crystallization reaction to obtain MWW structure molecular sieve (wherein the template agent is composed of main template agent and sub-template agent with a molar ratio of 0.5-20:1); S2: calcining the MWW structure molecular sieve obtained in S1 to remove template agent, then carrying out ammonium exchange, and calcining again to obtain H type molecular sieve; S3: mixing the H type molecular sieve obtained in S2 with inorganic oxide and nitric acid solution, kneading and molding to obtain solid acid alkylation catalyst. The present invention uses the method of seed crystal and two kinds of template agents to cooperate in crystallization, directly synthesizing MWW structure molecular sieve without using hexamethyleneimine, piperidine, homopiperazine, and further obtaining solid acid alkylation catalyst.

The application relates to the technical field of catalysts, and discloses a composite organic acid catalyst for acetate production, a preparation method and application thereof.The composite organic acid catalyst for acetate production comprises silica-supported organic acid; the silica-supported organic acid is silica-supported methyl sulfonic acid and silica-supported alkane disulfonic acid; and the mass ratio of the silica-supported methyl sulfonic acid and the silica-supported alkane disulfonic acid is 1.5:0.4-1.4.Through the technical scheme, the problem that the yield of acetate is not high due to the insufficient catalytic effect of the solid acid catalyst in the prior art is solved.