237results about "Peroxy compound preparation" patented technology

The invention belongs to the technical field of acyclic compounds, and particularly relates to a preparation method of tert-butyl peroxyisobutyrate. Stirring and cooling a solvent, a tert-butyl hydroperoxide aqueous solution and deionized water to obtain a mixed solution A; adding liquid caustic soda and a solid base catalyst into the mixed solution A under a stirring condition, and continuously stirring for reaction to obtain a mixed solution B; under the stirring condition, isobutyryl chloride and a water-soluble distributing agent are added into the mixed solution B, stirring reaction continues to be conducted, and a mixed solution C is obtained; standing and layering the mixed solution C, separating to obtain a tert-butyl peroxyisobutyrate crude product, and refining the tert-butyl peroxyisobutyrate crude product to obtain the tert-butyl peroxyisobutyrate. According to the method, the raw material utilization rate is increased, the reaction speed is increased, the reaction time is shortened, and the product yield is high.

The invention provides a synthesis process of tert-amyl peroxy-2-ethylhexyl carbonate, and relates to the technical field of organic synthesis.The synthesis process comprises the following steps that S1, caustic soda liquid and water are pumped into a reaction kettle; s2, tert-amyl hydroperoxide is added into the reaction kettle for a salt forming reaction; s3, after the salt forming reaction is finished, adding a catalyst, dropwise adding isooctyl chloroformate, and carrying out condensation reaction to obtain a crude product of tert-amyl 2-ethylhexyl peroxide; and S4, carrying out alkali washing and water washing on the peroxide 2-ethylhexyl tert-amyl carbonate crude product to obtain a finished product. The catalyst is a tree-shaped structure catalyst of a silica gel carrier, and has the advantages of high conversion rate and high yield.

The present invention relates to the technical field of tert-butyl hydroperoxide, and discloses a tert-butyl hydroperoxide processing homogeneous reaction kettle, the tert-butyl hydroperoxide processing homogeneous reaction kettle comprises a homogeneous reaction kettle body, a material inlet and a connection port, the material inlet and the connection port are arranged at the top of the homogeneous reaction kettle body, and a mixing mechanism is arranged in the homogeneous reaction kettle body, a heating mechanism is arranged on the outer side of the homogeneous reaction kettle body, a mixing mechanism comprises a driving motor, a connecting rod, a supporting rod, a stirring plate and a guide groove, and the driving motor is mounted in the middle of the top of the homogeneous reaction kettle body. According to the homogeneous reaction kettle for processing the tert-butyl hydroperoxide, tert-butyl hydroperoxide reactant mixed liquid is stirred by the stirring plate and the guide groove, so that the mixed liquid can move upwards or downwards, the reactants of the tert-butyl hydroperoxide can be comprehensively mixed, and the reactants of the tert-butyl hydroperoxide react more thoroughly; impurities in the tert-butyl hydroperoxide are reduced, and the quality of the tert-butyl hydroperoxide is improved.

The invention discloses a preparation method of tert-butyl peroxyneodecanoate, which is characterized in that zinc oxide is uniformly dispersed on a graphene oxide / attapulgite composite carrier interface in a nano-particle form through a hydrothermal method to form a supported catalyst with a high specific surface area, active sites are fully exposed, the catalytic efficiency is obviously improved, and the catalytic activity is improved. Zinc oxide and a carrier form strong interaction, in the reaction process, an adaptive alkaline system is optimized, the composite catalyst shows high selectivity in a sodium hydroxide / tert-butyl hydroperoxide system, the residual quantity of byproducts is smaller than or equal to 0.01%, reaction conditions are mild, high-temperature and high-pressure equipment is not needed, the catalyst can be recycled, and the content of metal ions in waste liquid is smaller than or equal to 0.1 ppm; the purity of the obtained product tert-butyl peroxyneodecanoate is more than or equal to 99.5%, the active oxygen content reaches 7.2-7.5%, the decomposition temperature is more than or equal to 120 DEG C, the 10h half-life period temperature is 75-80 DEG C, the initiation efficiency is more than or equal to 95% when the tert-butyl peroxyneodecanoate is used as an initiator, the light transmittance is more than or equal to 92%, the molecular weight distribution index is less than or equal to 2.5, no implosion phenomenon exists in the polymerization process, and the advantages of high efficiency, low consumption

The present invention relates to a method for obtaining disinfection and / or sterilisation solutions from a mixture of an alcohol and a dialkyl carbonate. Said mixture is placed in contact with O2 to obtain hydrogen peroxide (H2O2) by means of a photocatalytic reaction, followed by treatment of the resulting mixture with a catalyst to obtain peroxycarboxylic acid and final dilution with water. The present invention also relates to a system for carrying out the process continuously, as well as the preparation on demand of the active disinfection and / or sterilisation solution obtained using same.

Disclosed is the use of a dividing-wall column in a process for co-producing propylene oxide and styrene monomer. Feed streams to a dividing-wall column comprise a bottoms product produced in recovering crude propylene oxide from an epoxidation reaction product, a hydrogenated byproduct styrene monomer production, and a light fraction of a bottoms product withdrawn from the dividing-wall column. Products from the dividing-wall column comprise an overhead product comprising ethylbenzene for recycle to an oxidation zone, an intermediate product comprising methylbenzyl alcohol and acetophenone as feed to a dehydration zone to produce styrene monomer, and a bottoms product comprising methylbenzyl alcohol and heavy materials.

The invention belongs to the technical field of medical analysis, and particularly relates to a method for separating chemical components in hemsley rockvine root. According to the present invention, various chromatography methods are adopted to carry out separation and purification, such that sitroside (I), vanillyl glycolII (II), 5-hydroxymaltol (III), vanillic acid (IV), afzelin (V), 2, 3-dihydroxypyrazole (9E, 11E)-13-hydroxypyrazole (9, 11-dienoate), and 2, 3-dihydroxypyrazole (10E, 12E)-9-hydroxypyrazole (10, 12-dienoate) are obtained from hemsley rockvine root. Wherein the compounds II, III, VI and VII are separated from the hemsley rockvine root for the first time, and development and quality control of the hemsley rockvine root medicinal material are facilitated.

The application discloses a composite catalyst and application thereof in synthesis of alkyl peroxide. The composite catalyst comprises a molecular sieve main catalyst with medium Brnsted acidity and a Lewis acid cocatalyst supported by a non-acid carrier. The composite catalyst provided by the application has the advantages of high activity, high reaction selectivity and long-term stability in the reaction for synthesizing alkyl peroxide.

The present invention relates to the technical field of the preparation of methyl ethyl ketone peroxide, and particularly relates to a preparation method of methyl ethyl ketone peroxide with low water content, which comprises the following steps: (1) adding hydrogen peroxide into a reaction kettle, adding a catalyst and stirring evenly, and then slowly dropping methyl ethyl ketone into the reaction kettle under stirring, and carrying out a reaction after the dropping is completed; (2) after the reaction is completed, adding a water separator into the reaction mixture, standing for stratification, and taking the upper-layer liquid; (3) freezing the upper-layer liquid, filtering the frozen liquid, and adding dimethyl phthalate into the filtrate for dilution to obtain the product. In the preparation method of methyl ethyl ketone peroxide with low water content of the present invention, by adding a freezing treatment process, the synthesized methyl ethyl ketone peroxide is frozen at -30 to -50 °C, greatly reducing the water content of methyl ethyl ketone peroxide. The water content of the prepared methyl ethyl ketone peroxide product is 4-5%, and the active oxygen content is 8-9%. The reaction performance and curing performance are good, and it has high production application value.

The application belongs to the technical field of chemical synthesis, and particularly relates to a preparation method of diisopropyl peroxydicarbonate and application of the diisopropyl peroxydicarbonate. The preparation method comprises the following steps: firstly, isopropyl chloroformate and an ester-soluble organic solution are added into a three-necked flask, stirring is started, hydrogen peroxide solution is added, when the temperature of the mixture in the flask is stabilized at-5 DEG C, sodium hydroxide solution is slowly added into the three-necked flask, and the time and temperature in the reaction process are controlled; finally, the organic phase is separated, washed with water, dried with anhydrous sodium sulfate, and obtained. The preparation method is safe and controllable, the yield of the diisopropyl peroxydicarbonate is high, the stability is good, the diisopropyl peroxydicarbonate can be directly used for the preparation of polyvinylidene fluoride, a chain transfer agent is not needed, polymerization can be carried out under low-temperature conditions, the molecular chain regularity of the polyvinylidene fluoride is improved, abnormal structures are few, the crystallinity is high, and the comprehensive performance is good.

The present invention relates to a method for preparing a mixture containing cyclohexanol and cyclohexanone, comprising the step of hydrogenating cyclohexyl hydroperoxide in cyclohexane in the presence of a Raney nickel catalyst to obtain cyclohexanol and cyclohexanone.

The invention belongs to the technical field of acyclic compounds, and particularly relates to a preparation method of tert-butyl peroxymaleate. Adding a tert-butyl hydroperoxide aqueous solution into deionized water, mixing, stirring and cooling to obtain a mixed solution; under a stirring condition, sequentially adding liquid caustic soda and sodium nitrate into the mixed solution, and continuing to stir and react after the liquid caustic soda and the sodium nitrate are added to obtain a reaction solution I; under the stirring condition, maleic anhydride is added into the reaction liquid I, stirring reaction continues after adding is completed, and reaction liquid II is obtained; under the stirring condition, acid is added into the reaction liquid II, stirring reaction continues after adding is completed, and reaction liquid III is obtained; adding deionized water into the reaction liquid III for washing, and performing suction filtration to obtain a tert-butyl peroxymaleate crude product; and washing and drying the tert-butyl peroxymaleate crude product to obtain the tert-butyl peroxymaleate. No organic solvent is added, the method is environmentally friendly, the cost is saved, and meanwhile the product yield can be increased to 93% or above.

The present invention discloses a process for preparing m-chloroperbenzoic acid by using a molecular sieve catalyst, belonging to the technical field of chemical catalytic preparation, and comprising the following steps: S1, dissolving m-chlorobenzoic acid in an organic solvent, adding the molecular sieve catalyst, uniformly stirring, and then dropwise adding an aqueous oxidant solution with a mass fraction of 15% to 30% for an oxidation reaction; S2, after the oxidation reaction is completed, separating the molecular sieve by using a filter for the next reaction; S3, after separation, extracting and separating the organic phase, distilling and recovering the organic solvent to obtain m-chloroperbenzoic acid crystals. The present invention overcomes the defects and deficiencies in the existing process methods, such as low effective yield and serious wastewater pollution. A solid molecular sieve is used as the catalyst. The catalyst has stable properties, simple separation, the solvent can be recycled and reused in the process, the product yield is high, environmental problems caused by other oxidation methods are avoided, and it is beneficial to large-scale industrial production.

The application relates to the field of thermal catalysis, and discloses a method for preparing 1-cyclohexylbenzene hydrogen peroxide by solvent-free thermal catalytic selective oxidation of cyclohexylbenzene with molecular oxygen. The method uses a metal bromide as a catalyst, azobisisobutyronitrile or t-butyl hydroperoxide as an initiator, and pure oxygen as an oxidant, and can effectively selectively oxidize cyclohexylbenzene (CHB) into 1-cyclohexylbenzene hydrogen peroxide under normal pressure, solvent-free conditions and at a temperature above 90 DEG C. The catalytic system has the advantages of low cost, simple operation process, high catalytic oxidation efficiency and high selectivity of the target oxidation product.

This invention discloses a method for preparing tert-butyl benzoate peroxide using a microchannel reactor, comprising the following steps: adding liquid alkali to tert-butyl hydroperoxide, allowing it to stand and separate into layers, and obtaining the lower sodium salt; passing the obtained sodium salt into the microchannel reactor, simultaneously passing benzoyl chloride into the microchannel reactor for mixing and reaction; passing the material emanating from the microchannel reactor into an RTB reactor for incubation and reaction to obtain crude tert-butyl benzoate peroxide; purifying the crude tert-butyl benzoate peroxide to obtain tert-butyl benzoate peroxide. This invention employs continuous feeding and achieves the synthesis reaction through a microchannel reactor, reducing the reaction time from several hours to tens of seconds to several minutes, significantly improving reaction efficiency. The entire reaction process in the microchannel reactor used in this invention is a continuous reaction, which is safe and environmentally friendly, has high production efficiency, requires a small equipment footprint, is simple to operate, reduces manual operation, and lowers production costs.

ELIMINATION OF IMPURITIES WITHIN AN ORGANIC PEROXIDE The present invention relates to the use of a zeolitic adsorbent material, to purify organic peroxides, and more particularly to eliminate the impurities present in these compositions of organic peroxides.

In one aspect, the disclosure relates to a method for oxidizing alkanes to produce industrially useful solvents and other compounds. In a further aspect, the method includes the steps of contacting an alkane or mixture of alkanes with a core-shell nanoparticle and an oxidant to produce a mixture and then irradiating the mixture with UV and / or visible light. The methods are selective for desired products and do not produce overoxidized species such as, for example, carbon dioxide. In a still further aspect, the methods are scalable and can be conducted for a short time under relatively mild conditions. In an aspect, the core-shell nanoparticle includes a metal-oxide containing semiconductor core, an amorphous, radiation transparent shell, and optional metal nanoparticle dopants in the shell. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

The invention discloses organic ketone peroxide neutralization reaction equipment which structurally comprises a reaction tank, a motor is fixedly installed at the middle end of the top of the reaction tank, the output end of the motor drives a stirring rod arranged at the middle end in the reaction tank to rotate, a lifting plate is installed on the upper middle portion of the stirring rod, the lower end of the lifting plate is connected with an exhaust hood, and the exhaust hood wraps the stirring rod. According to the present invention, according to the height of the liquid in the reaction tank during the neutralization reaction process, the floating ball is suspended on the liquid surface so as to drive the lifting plate to perform lifting adjustment, such that the defoaming plate is driven to be located at the upper layer of the liquid; the stirring rod rotates and drives the connecting outer ring and the eight defoaming plates to synchronously rotate at the same time, and the spring guide rods apply elastic guidance to the defoaming plates, so that the defoaming plates repeatedly and elastically swing on the spring guide rods, and the long needles arranged on the bottom surfaces of the defoaming plates puncture bubbles generated in the neutralization reaction process.

The invention relates to the related technical field of synthesis of materials, and particularly provides a synthesis method of liquid organic peroxide. The synthesis method comprises the following steps: S101, premixing an oxygen-containing organic compound and inorganic acid to obtain a reaction premix; s102, the reaction premix obtained in the step S101 and hydrogen peroxide are sequentially conveyed to a filling reactor and a delay pipeline, and the reaction premix and the hydrogen peroxide are subjected to a peroxidation reaction in the filling reactor and the delay pipeline; wherein an inner cavity of the filling reactor is filled with austenitic stainless steel; and step S103, carrying out oil-water separation on the reaction product obtained in the step 102 to obtain the liquid organic peroxide. By filling the austenitic stainless steel in the filling reactor, the yield and purity of the product, especially chromium-nickel type austenitic stainless steel, can be obviously improved.

The invention relates to the technical field of disinfectants, in particular to a disinfectant production process for improving stability by utilizing a synergistic effect. The method comprises the following steps: preparing raw materials, preparing and premixing a stabilizer solution, adding acetic acid and hydrogen peroxide, reacting, aging, filtering and treating a product. In the disinfectant production process for improving the stability by utilizing the synergistic effect, four stabilizers are prepared into dilute solutions and mixed in proportion, the dilute solutions and peracetic acid can generate the synergistic effect, decomposition of peracetic acid is inhibited from the molecular level, catalytic decomposition of hydrogen peroxide by metal ions is avoided through nonmetal material equipment with a light shielding system, and the stability of the disinfectant is improved. Decomposition reaction caused by illumination is prevented, and product stability is improved; meanwhile, in the aspect of safety, the explosion risk of a container during hydrogen peroxide storage and the injury to operators during mixing are avoided; and in the aspects of cost and convenience, the production cost is reduced, a consumer does not need to mix by himself, and the use convenience of the product is improved.

This invention belongs to the field of acyclic compound synthesis technology, specifically relating to a production process for 1,1-dimethyl-3-hydroxybutyl hydrogen peroxide. The production process includes the following steps: (1) preparing a metal salt solution A; preparing a solution B from 1,3,5-tris(4-carboxyphenyl)benzene; oxidizing carbon nanotubes to form carbon oxide nanotubes, and then preparing a suspension from molecular sieves, metal oxides, and carbon oxide nanotubes; (2) adding solution B to the suspension, continuing to add solution A for reaction, and after post-treatment, obtaining a catalyst precursor; (3) calcining the catalyst precursor in an inert atmosphere to obtain a catalyst; (4) activating the catalyst to catalyze the reaction of 2-methyl-2,4-pentanediol and hydrogen peroxide to obtain 1,1-dimethyl-3-hydroxybutyl hydrogen peroxide. This invention further improves the selectivity and yield of 1,1-dimethyl-3-hydroxybutyl hydrogen peroxide by designing the catalyst.

To provide a process for preparing a peroxyester or peroxycarbonate with improved storage stability and reduced hydroperoxide content.SOLUTION: The present disclosure relates to a process for preparing a peroxyester or peroxycarbonate comprising: a) reacting an organic hydroperoxide with an acid halide, an acid anhydride, or a haloformate, in the presence of a base, b) separating an aqueous layer after completion of step a), c) adding a reducing agent to an organic layer after the aqueous layer has been separated in step b), wherein the reducing agent is an agent capable of reducing the organic hydroperoxide to the corresponding alcohol, d) ensuring that the mixture of step c) has a pH of greater than 6.8 by maintaining or increasing the pH of the mixture of step c), and e) maintaining the pH of greater than 6.8 for at least 5 seconds.SELECTED DRAWING: None

The application discloses a preparation method of dibenzoyl peroxide, and relates to the technical field of organic peroxide preparation. The preparation method comprises the following steps: preparing dibenzoyl peroxide crude product and initial synthesis obtained recycling mother liquor; taking out two parts from the initial synthesis obtained recycling mother liquor, and reacting with a sodium hydroxide solution, hydrogen peroxide, a surfactant aqueous solution and benzoyl chloride; at least the benzoyl chloride is contained in the multiple materials, and the multiple materials are pre-mixed by a pre-mixer; heat preservation reaction is carried out, and after the reaction is completed, centrifugal separation is carried out to obtain the dibenzoyl peroxide crude product and second synthesis obtained recycling mother liquor; and the dibenzoyl peroxide crude product is sequentially subjected to water washing and solid-liquid separation to obtain a finished product. The pre-mixer is used to realize instant super-uniform mixing of the materials, the reaction is more uniform, the product is fine and small in particle size, the particle size distribution is uniform, the reaction yield is high, the amount of water used for subsequent washing is reduced, the recycling of the mother liquor reduces the discharge amount of high-salinity organic waste liquid from the source, and the preparation cost is reduced.

The invention discloses a cross-linking agent, a preparation method, a cross-linked polyethylene cable material and a cable, and relates to the technical field of cross-linking agents. The invention provides a cross-linking agent for cross-linking polyethylene. The cross-linking agent is a peroxide cross-linking agent with carbon-carbon double bonds at the tail end of a molecular structure. As the tail end of the molecular structure of the peroxide cross-linking agent provided by the invention has a carbon-carbon double bond, the peroxide cross-linking agent provided by the invention has the characteristics of high cross-linking reaction speed, short cross-linking time and few cross-linking byproducts when being used for cross-linking polyethylene, so that a cable with good use stability can be obtained; and moreover, the production efficiency of the high-voltage cable can be effectively improved, the cable degassing time is shortened, the cable degassing energy consumption is reduced, and the production cost is saved.

The present disclosure relates to a process for the preparation of a tertiary alkyl organic peroxide comprising: a) reacting in a first condensation stage a component comprising at least one tertiary alcohol group with a compound comprising at least one tertiary hydroperoxide function in the presence of a catalyst and optionally a co-catalyst, b) separating the aqueous phase from the organic phase in a dehydration stage, and c) separating the aqueous phase from the organic phase in a second condensation stage in the presence of a catalyst and optionally a co-catalyst to form a mixture comprising an organic phase and an aqueous phase, the organic phase comprising a tertiary alkyl organic peroxide. The component containing at least one tertiary alcohol group is further reacted with the compound containing at least one tertiary hydroperoxide group, the molar ratio between the compound containing at least one tertiary hydroperoxide functional group and the component containing at least one tertiary alcohol group being at least 3: 1 in the first condensation stage, and the molar ratio between the compound containing at least one tertiary hydroperoxide functional group and the component containing at least one tertiary alcohol group being at least 2: 1 in the second condensation stage. And wherein dehydration does not occur during the first condensation stage.

The present disclosure relates to organic peroxide formulation comprising at least one organic peroxide; and at least one unsaturated scorch retarder having the structure of general formula (I): wherein, R1 is selected from OH, O-R5, or a saturated or unsaturated, linear, branched, or cyclic C1 to C8 alkyl group; R2 is on each occurrence independently selected from H or a saturated or unsaturated, linear or branched C1 to C8 alkyl group; R3 is on each occurrence independently selected from H, O-R6, or a saturated or unsaturated, linear or branched C1 to C8 alkyl group; R4 is on each occurrence independently selected from OH, O-R6, or a saturated or unsaturated, linear or branched C1 to C8 alkyl group; R5 is selected from a saturated or unsaturated, linear or branched C1 to C8 alkyl group or -[CH2]n-OCOCR4CR2R3; R6 is on each occurrence independently selected from a saturated or unsaturated, linear or branched C1 to C8 alkyl group; and n is from 2-8, with the proviso that one but not both of R2 and R3 are H, or wherein R1 and R2 are joined to form a 5, 6, or 7 membered ring, said ring being formed of atoms selected from C, O, and S and containing one or two carbon-carbon double bonds and one or two carbonyl groups, said ring being optionally substituted with one or more saturated or unsaturated, linear or branched C1 to C8 alkyl groups; R3 is H; and R4 and R6 are as described above, or wherein R3 and R4 are joined to form a 5, 6, or 7 membered ring, said ring being formed of atoms selected from C, O, and S and containing one or two carbon-carbon double bonds, said ring optionally substituted with one or more saturated or unsaturated, linear or branched C1 to C8 alkyl groups; R2 is H; and R1, R5, R6 and n are as described above.

The application provides a synthesis method of di-(3,5,5-trimethylhexanoyl) peroxide and an equipment for implementing the synthesis method. The method comprises the following steps: conveying an alkaline solution, a hydrogen peroxide solution and a 3,5,5-trimethylhexanoyl chloride solution into a micro-mixer, mixing the solutions, and then feeding the mixed solution into a micro-reactor to perform a preliminary reaction, so as to obtain a first oil-water mixture; transferring the first oil-water mixture into a reaction kettle to continue the reaction, so as to obtain a second oil-water mixture; performing liquid separation treatment on the second oil-water mixture, and obtaining an oil phase; performing post-treatment on the oil phase, so as to obtain di-(3,5,5-trimethylhexanoyl) peroxide. By taking the micro-mixer and the micro-reactor as the core to prepare di-(3,5,5-trimethylhexanoyl) peroxide, local heat accumulation can be controlled through fast heat removal, the risk of combustion and explosion of thermally unstable organic peroxide can be reduced, the contact area between the oil phase and the water phase can be increased, the reaction rate can be increased, and the production efficiency can be greatly improved.

The application belongs to the technical field of chemical product production, and particularly relates to a catalyst composition and a method for preparing peroxy acid. The catalyst composition contains an acidic catalyst and a stabilizer, wherein the stabilizer is a nitrogen-containing alkaline compound with a lone pair of electrons on the N atom. The specific catalyst composition can be used to prepare peroxy acid, and the conversion rate of hydrogen peroxide is greater than 95%, the selectivity of the prepared peroxy acid is greater than 70%, and the final obtained peroxy acid product is used to prepare caprolactone, so that the conversion rate of cyclohexanone is greater than 95%, and the selectivity of the prepared caprolactone is greater than 95%.

The photochemical synthesis method for preparing the solid hydrogen peroxide compound comprises the following steps: (1) loading a benzyl compound and a salt, an acid or urea into a reactor and introducing oxygen or air to form a reaction system, irradiating the reaction system with a light source containing ultraviolet light, controlling the reaction temperature to be between room temperature and 60 DEG C, and allowing the reaction to proceed for at least 10 minutes; and (2) crystallizing, separating and drying the liquid system containing the hydrogen peroxide compound to obtain the solid hydrogen peroxide compound. The present application provides a new technical solution for preparing the solid hydrogen peroxide compound. The method is simple and safe, and overcomes the defects of the reaction mechanism of the photocatalyst system.

The application belongs to the field of catalysts and preparation thereof, and particularly relates to a catalyst, a preparation method and a method for preparing peroxy acid. The catalyst comprises modified molecular sieves and heteropoly acid supported on the modified molecular sieves, wherein the surface of the modified molecular sieves is modified with alkyl and amino groups. When the catalyst is used to prepare peroxy acid, the conversion rate of organic acid can be improved, the equilibrium conversion rate is higher than 60%, the selectivity of the prepared peroxy acid is higher than 98%, and the catalyst can be recycled and reused, and is suitable for industrial production.