279results about How to "Simple post-processing" patented technology

A laser cutting machine for metal plate cutting relates to the technical field of laser cutting machines and comprises a horizontally-arranged cutting table, a receding groove and a sliding U-shaped plate are sequentially arranged at the top of the cutting table in the length direction of the cutting table in a penetrating mode, the sliding U-shaped plate is horizontally arranged in a sliding mode, and a three-axis module is arranged at the position, above the receding groove, of the top of the cutting table. The laser cutting gun is installed on the three-axis module, a plurality of supporting rollers are horizontally arranged in the sliding U-shaped plate side by side, the two ends of each supporting roller are correspondingly and rotationally connected with the opposite inner walls of the sliding U-shaped plate, a horizontally-arranged partition plate is fixedly arranged on the inner wall of the avoiding groove, and a transferring assembly is arranged at the bottom of the partition plate. A discharging assembly and a fixing box are arranged on the left side and the right side of the partition plate correspondingly. The problem that cut finished products in kerfs of an existing laser cutting machine are difficult to take out is solved. And when cutting scraps are cleaned, shutdown disassembly operation is needed. And the positioning accuracy of the cutting area is low. And the post-treatment process of the cutting excess materials is tedious.

The invention discloses a method for synthesizing pyroxasulfone, which comprises the following steps: by taking a raw material A and air as raw materials, carrying out oxidation reaction under the catalysis of a Fe (III) catalyst to obtain pyroxasulfone. The method has the advantages of mild reaction conditions, high yield, less three wastes, avoidance of hydrogen peroxide use and storage reactions, low cost and suitableness for industrial production.

The invention discloses a screening method for 3D printing powder. The screening method comprises the following steps that powder needing to be screened is prepared; s2, performing screening modes of different levels according to the powder attribute information of the powder: primary screening of the powder; powder is subjected to multi-stage screening; screening fine powder; the screening process is monitored, an alarm detection mechanism is installed, and whether blockage occurs in the screening process or not is judged according to the screening result; different grades of screening modes are carried out by detecting powder attribute information of powder, the alarm mechanism is arranged, whether blockage occurs in the screening process or not is judged according to the screening result, the alarm detection mechanism can be based on the weight of falling materials, when the weight of discharged materials reaches a certain pressure value, it is indicated that work is normal, and the working efficiency is improved. And if the pressure is lower than a normal numerical value, the blanking amount is small, blockage is caused, the blockage and accumulation phenomena of particle materials on the screen are effectively prevented, the continuity and the stability of the screening process are ensured, and the printing quality and the printing consistency are improved.

The invention discloses an asymmetric diimine zinc complex and a preparation method and application thereof.The preparation method of the asymmetric diimine zinc complex comprises the steps that acenaphthequinone, a first dehydrating agent, a first catalyst, first substituted aniline and a solvent are subjected to a first reaction, and a monoimine ketone compound is obtained; and performing a second reaction on the monoimine ketone compound, a zinc salt, a second dehydrating agent, second substituted aniline and a second catalyst to obtain the asymmetric diimine zinc compound. According to the preparation method of the asymmetric diimine zinc compound, zinc salt is added in the reaction process, generated unstable large-steric-hindrance groups are used for replacing diimine for stable complexation, a corresponding zinc complex is generated and can be separated from a reaction system in time in the reaction process, the reaction equilibrium can be effectively promoted to be carried out to a positive reaction, and the yield of the asymmetric diimine zinc compound is improved. And the large-steric-hindrance group substituted diimine zinc complex can be synthesized with high selectivity and high yield.

The invention belongs to the field of conducting polymers, and discloses a method for synthesizing an n-type conducting polymer poly (benzodifuran diketone) (PBFDO). The method comprises the following steps: in an inert atmosphere, dispersing benzodifuran diketone (BFDO), S8 and organic alkali in an organic solvent, then carrying out a heating reaction, and after the reaction is finished, pouring into a dialysis bag for dialysis to obtain the n-type conductive polymer PBFDO. The conductivity of the prepared n-type conductive polymer poly (benzodifuran diketone) (PBFDO) is as high as 2300 S cm <-1 >.

The invention provides a polymer composite gel for heavy metal ion adsorption and a preparation method and application thereof, diatomite DE, chitosan CS, polyethyleneimine PEI and sodium alginate SA are used as raw materials, and polymer modification crosslinking is promoted through an ionic crosslinking method to form the composite gel. Compared with the prior art, SA is a biodegradable natural polysaccharide material, contains rich hydroxyl and carboxyl functional groups and is used as a controllable modification site, DE is used as an inorganic clay material, has a layered porous structure and contains rich active sites, and CS and PEI polymer surfaces have rich amino and hydroxyl groups and are used as ion adsorption sites. Meanwhile, PEI is used as a nucleation site and an ionic cross-linking agent to promote material modification and cross-linking to form composite gel. The composite gel is used as an ion adsorbent, can be adsorbed through chemical chelation between functional groups and ions, and can also be physically adsorbed through a porous structure, so that the composite gel shows efficient ion adsorption performance.

The invention belongs to the field of organic synthesis, and particularly relates to a synthesis method and application of amlodipine impurities. The method comprises the following steps: 1) weighing raw materials and a solvent, uniformly mixing, heating the system to reflux, dropwise adding alkali liquor, uniformly mixing, reacting, adding acid liquor after the reaction is completed, adding an organic solvent for extraction after spin-drying, combining organic phases, concentrating, and carrying out vacuum pump pull-drying treatment to obtain an impurity L; and 2) adding a solvent into the impurity L, uniformly mixing, adding an active ester catalyst, reacting, drying by a vacuum pump, washing the product, drying the organic phase, and spin-drying to obtain the target impurity. The synthesis method provided by the invention is simpler to operate, avoids a long path of amlodipine impurity synthesis, is milder in reaction condition, is simpler in post-treatment, does not involve a complicated separation process, and is high in product purity.

The invention provides a preparation method of high-purity bis (2, 4, 4-trimethylpentyl) phosphinic acid, and belongs to the technical field of organic synthesis. The preparation method comprises the steps that a phosphorus source, diisobutylene, an initiator, a solvent and a catalyst are added into a sealed reaction kettle capable of being stirred and heated to be subjected to a reaction, the high-purity bis (2, 4, 4-trimethylpentyl) phosphinic acid is obtained, the phosphorus source is sodium hypophosphite or hypophosphorous acid, and the catalyst is disulfide. According to the preparation method provided by the invention, the disulfide is adopted as the catalyst to be added into the reaction, so that the reaction can be effectively promoted to shorten the reaction time and improve the yield and purity of the product, and meanwhile, the side reaction is few, the post-treatment is simple, and the product impurity content is low.

The invention belongs to the technical field of organic synthesis and drug intermediate preparation, and relates to a resolution preparation method of a monepantel key intermediate. In the first aspect, the invention provides a preparation method of a compound shown as a formula 3, which comprises the following steps: # imgabs0 #, in which R1 is selected from TMS, TES, TBDMS, TIPS, TBDPS or # imgabs1 #, the reaction is as follows: # imgabs2 # comprises the following steps: step 2, reacting a compound shown as a formula 2 with an ammonia source and a cyaniding reagent to obtain the compound shown as the formula 3; according to the method 2, the reaction is as follows: # imgabs3 # comprises the following steps: step 5, a compound shown in a formula 7 is subjected to the action of ammonia gas to obtain a compound shown in a formula 3; on the second aspect, the invention provides a preparation method of a compound shown as a formula 5, and the reaction is as follows: # imgabs4, in which R1 is as described in the first aspect; the method comprises the following steps: step 3, obtaining a compound shown as a formula 5 from a compound shown as a formula 3 under the action of a resolving agent. The method disclosed by the invention is higher in yield, simpler in post-treatment and simple and convenient to operate, and has a good industrial production prospect.

The invention discloses a preparation method of a dotenorad key intermediate (a compound shown as a formula I), which comprises the following steps: alkalizing 2-aminothiophenol to generate 2-aminothiophenol sodium salt, carrying out cyclization reaction on the 2-aminothiophenol sodium salt and formaldehyde, and finally condensing the 2-aminothiophenol sodium salt and 3, 5-dichloro-4-methoxybenzoyl chloride to obtain the dotenorad key intermediate (the compound shown as the formula I).

The invention provides a method for continuously preparing imidacloprid, which comprises the following steps: (1) introducing 2-chloro-5-chloromethylpyridine, an imidazolidine solution and an acid-binding agent solution into a microchannel reaction device, and carrying out condensation reaction to obtain a reaction solution; and (2) sequentially carrying out heat preservation treatment and post-treatment on the reaction liquid obtained in the step (1) to obtain the imidacloprid. According to the invention, 2-chloro-5-chloromethylpyridine without solvent dilution, imidazolidine, the acid-binding agent and the organic solvent are taken as raw materials and are directly introduced into the microchannel reaction device for one-step condensation reaction to obtain the imidacloprid reaction liquid crude product, so that the dosage of imidazolidine can be reduced, the reaction time can be shortened, the reaction rate can be improved, continuous production can be realized, and the production cost can be reduced. The method has the advantages of low production cost, high intrinsic safety, high raw material utilization rate, high product selectivity and the like; in addition, a DMF solvent is not needed, the post-treatment process is simplified, and meanwhile, the problem that DMF in the wastewater is difficult to biochemically treat is solved.

The invention provides ATP / CCS / SA-PEI aerogel as well as a preparation method and application thereof, attapulgite ATP, carboxylated chitosan CCS, polyethyleneimine PEI and sodium alginate SA are adopted as raw materials, and polymer modification and crosslinking are promoted through an ionic crosslinking method to form the aerogel. The preparation method comprises the following steps: firstly, adding a prepared CCS solution into an SA solution to obtain a CCS / SA solution; the preparation method comprises the following steps: adding a CCS solution into a reaction kettle, adding an ATP suspension, finally adding a PEI solution, uniformly mixing, pouring into a plastic mold, freeze-drying, cross-linking, washing with water, and freeze-drying again to obtain the ATP / CCS / SA-PEI aerogel. The aerogel prepared in the invention has the advantages of large specific surface area, many adsorption groups, good adsorption performance on dye pollutants and heavy metal ions, good thermal stability, reusability, and good application value in the removal of dye pollutants and heavy metal ions in sewage.

The invention discloses a preparation method of octafluorocyclopentene, which comprises the following two steps of: firstly, reacting 4-cyclopentene-1, 3-diketone with a selective fluorine reagent in acetonitrile under the condition of reflux to generate a crude product second mixture, purifying the second mixture, and putting the purified second mixture into a second-step reaction to obtain the octafluorocyclopentene. Reacting with diethylamino sulfur trifluoride in dichloromethane to generate a third mixture; the method has the advantages of environment-friendly and simple reaction process, no generation of three wastes, low cost, easy obtaining, simple reaction process, mild reaction, no generation of waste gas pollution even if nitrogen protection is needed, easy operation, and suitableness for industrial production.

The invention discloses a method for separating and purifying squalene from squalene fermentation liquor, and belongs to the technical field of squalene extraction. The method comprises the following steps: 1) pretreatment: adding a wall breaking reagent into squalene fermentation liquor for wall breaking, or concentrating the squalene fermentation liquor and then adding the wall breaking reagent for wall breaking; 2) extraction: adding an organic solvent and a demulsifier, layering to obtain a water phase and an organic phase, and collecting the organic phase; 3) impurity removal: adding an aqueous solution, layering to obtain an aqueous phase and an organic phase, and collecting the organic phase; and 4) distilling: distilling to obtain purified squalene. The method is simple to operate, low in equipment investment, simple in post-treatment and low in extraction cost, and the obtained squalene refined product is high in yield, high in purity and suitable for industrialization.

The invention discloses an N-phenyl phenothiazine super-crosslinked polymer catalyst and a preparation method and application thereof.The method comprises the steps that Friedel-Crafts reaction is utilized, N-phenyl phenothiazine (I), dimethyl formal (II) and lewis acid are dissolved in a solvent, the mixture is stirred to react for 12-36 hours at the temperature of 60-120 DEG C, cooling and filtering are conducted, then extraction is conducted for 12-24 hours through a Soxhlet extractor, cooling and filtering are conducted again, and the N-phenyl phenothiazine super-crosslinked polymer catalyst is obtained. And drying the obtained solid to obtain the N-phenyl phenothiazine super-crosslinked polymer catalyst. The prepared N-phenyl phenothiazine super-crosslinked polymer catalyst can be applied to photocatalytic synthesis of 6-difluoromethyl phenanthridine derivatives, the reaction condition is mild, the catalytic efficiency is high, the selectivity is good, the catalyst can be recycled for multiple times, and the method is simple and easy to operate and has wide application potential.

The present application relates to the technical field of laser processing, especially to a lock processing and cutting device, which comprises a machine table and a transfer module installed on the machine table; a laser head is fixedly installed at the end of the execution component of the transfer module; a conveying assembly for conveying a sheet is fixedly installed above the machine table; wherein a positioning assembly for side positioning of the sheet and a stop assembly for stopping the end of the sheet are installed above the machine table; through the synergistic effect of the positioning assembly and the stop assembly, the present application realizes accurate positioning of the sheet, effectively guarantees the cutting accuracy and consistency of the lock panel; secondly, the traditional bench type single piece processing is replaced by a pipeline type continuous operation; the conveying, positioning and cutting processes of the sheet can be seamlessly connected, the auxiliary time of equipment waiting and manual intervention is reduced, the production efficiency is greatly improved, the finished product and waste after cutting can be automatically separated along the pipeline, and the post-processing process is greatly simplified.

The invention discloses an efficient pretreatment system and method for kitchen waste, and the pretreatment system comprises a material receiving and conveying unit, a first-stage hydraulic pulping and sorting unit, a second-stage hydraulic pulping and sorting unit, a solid-liquid separation unit, a desanding unit, an oil-water separation unit and an impurity conveying unit. According to the system, kitchen waste can be efficiently crushed into fine slurry through the two-stage hydraulic pulping and sorting unit, the pulping effect and the impurity removal rate are improved, organic matter loss is reduced, the fine slurry is subjected to deslagging and refining through the solid-liquid separation unit and the sand removal unit in sequence, follow-up equipment blockage or damage can be avoided, the operation safety of the system is improved, and the service life of the system is prolonged. According to the system, solid-liquid separation and oil-water separation of the kitchen waste can be effectively realized, so that convenience is provided for subsequent resource utilization, and the resource utilization efficiency is improved; when the system is applied to kitchen waste treatment, the pulping effect can be improved, follow-up treatment is facilitated, the follow-up treatment process is simplified, and the kitchen waste treatment speed and efficiency are improved.

The invention relates to modified epoxy resin and a preparation method thereof.The preparation method comprises the steps that S1, nano aluminum nitride and mesoporous silica are subjected to an ultrasonic reaction in an organic solvent, then a reaction product is sequentially subjected to centrifugal separation, filtering, washing and drying, and a precursor AlN-coated SiO2 is obtained; s2, the precursor AlN-coated SiO2 and epoxy resin are mixed and then heated to a molten state, heat preservation is conducted in the molten state, modified epoxy resin is obtained, and the modified epoxy resin is used as a heat conduction epoxy plastic packaging material for semiconductor structure packaging. Nanometer aluminum nitride and mesoporous silica are subjected to an ultrasonic reaction to obtain a precursor AlN-coated SiO2, and the precursor AlN-coated SiO2 is doped with epoxy resin, so that the heat-conducting property of the modified epoxy resin is remarkably enhanced, the modified epoxy resin can provide an additional heat dissipation way when being applied to semiconductor structure packaging, the requirement of electronic packaging for a high-heat-conducting packaging material is met, and the service life of the high-heat-conducting packaging material is prolonged. Meanwhile, the modified epoxy resin has good thermal property and mechanical property.

The invention relates to the technical field of fluorine-containing chemicals, and provides a perfluoroketone compound as well as a preparation method and application thereof, the structural formula of the perfluoroketone compound is as shown in # imgabs0 #, and Rf1, Rf2 and Rf3 are the same or different and are independently selected from C1-C8 straight-chain or branched-chain perfluoroalkyl groups. The perfluoroketone has the beneficial effects that the carbon number of the perfluoroketone is controllable, and perfluoroketones with different boiling points can be obtained according to requirements; according to the method for preparing the perfluoroketone compound, the adopted raw materials are low in cost, good in safety and stability, non-toxic, harmless and easy to store, the reaction process is controllable, the selectivity is high, products are easy to separate, aftertreatment is simple, and the method is suitable for actual technological production; the perfluoroketone provided by the invention has a relatively low dielectric constant and relatively good heat transfer performance, is non-combustible, and has a very good application prospect in the aspects of semiconductors, refrigeration systems and fire fighting.

The invention provides a synthesis method of a brissentan intermediate, and relates to the field of chemical drugs. The synthesis method comprises the following steps: performing chlorination reaction on a compound 1 to synthesize a compound 2; performing substitution reaction on the compound 2 and the compound 3 to synthesize a compound 4; carrying out Miyaura boronation reaction on the compound 4 to generate a compound 4i, and carrying out coupling reaction on the compound 4i and a compound 5 to synthesize a compound 6. The synthesis method avoids the use of chemicals with high toxicity and danger coefficient, reduces the use of catalysts, and is easy for large-scale production.

The present invention discloses a method for preparing nano-scale silver-coated copper powder with low silver content in a limited area, comprising the following steps: firstly, surface pretreatment of copper powder is performed; then, the pretreated copper powder is mixed with Schiff base solution and amino acid complexing agent to obtain copper powder precursor solution; silver salt solution is slowly dripped into the copper powder precursor solution for reaction; after the reaction, a de-crosslinking agent is added to perform solid-liquid separation, and the obtained solid product is washed and dried to obtain nano-scale silver-coated copper powder with low silver content. The present invention adds Schiff base auxiliary agent, and the cross-linked network formed by the Schiff base auxiliary agent in water not only plays the role of dispersant and complexing agent, but also can limit copper balls in the grid to replace with silver ions. The one-step method is adopted to prepare silver-coated copper powder, and the process is simple. The prepared silver-coated copper powder has low silver content, uniform and dense silver shell coating, high conductivity and oxidation resistance.

This invention discloses a highly efficient asymmetric synthesis method for aryl propionic acid drug molecules. The method uses racemic aldehydes as substrates and thiamine pyrophosphate-dependent enzymes as biocatalysts. Electrolysis is performed in a diaphragm-free electrolytic cell under conditions of an external redox dielectric and constant current, in a buffer salt solution and nitrogen atmosphere. This method achieves dynamic kinetic oxidation of aldehydes via bioelectrocatalysis, enabling the high-efficiency and high enantioselectivity synthesis of aryl propionic acid drug molecules. The method eliminates the need for redox agents and additives, is simple to operate, operates under mild reaction conditions, and is green and sustainable. This invention applies bioelectrocatalysis to asymmetric synthesis, providing a green and efficient new enzymatic synthetic route for the asymmetric synthesis of aryl propionic acid drug molecules, which has significant application prospects in the pharmaceutical industry.

The invention discloses a method for dehalogenation reduction of electron-rich aryl halide, which comprises the following step: by taking aryl halide as a raw material, carrying out heating reaction in the presence of phosphorous acid, elemental iodine and a solvent to prepare a corresponding aromatic compound. According to the method, the defect that expensive transition metal catalysts and equivalent metal reagents need to be used for participation in current mainstream methods is directly avoided, the electron-rich aryl halide is subjected to one-step dehalogenation reduction to obtain the corresponding aromatic hydrocarbon by taking low-cost, low-toxicity and relatively stable phosphorous acid as a reducing agent and taking the iodine elementary substance as a catalyst, and the method has the advantages of no metal participation, simple operation, low cost and the like. The method has the advantages of simple operation, low cost, environmental protection and the like, avoids the use of a metal reagent and the limitation that special equipment is not easy to amplify production, after the phosphorous acid reaction is finished, byproducts are generally phosphoric acid and corresponding phosphorus salts thereof and can be quickly removed by washing, the post-treatment is simple, and the method is beneficial to industrial production.

The invention discloses a method for preparing dapinustat by a one-pot method. According to the method, at least one of glycine ester and glycine ester salt is free under the alkaline condition and then reacts with chloroformate, 1, 3-dicyclohexylpyrimidine-2, 4, 6 (1H, 3H, 5H)-triketone is added into the reaction product, heating reaction is performed, finally ester hydrolysis and acidification are performed, separation and purification are performed, the dapinustat is obtained, the yield of the product is 82.5%, and the purity is 99.9% (HPLC). According to the invention, a one-pot reaction strategy is adopted, the cost is greatly reduced, the operation is simple and convenient, the reaction condition is mild, and the method is suitable for industrial large-scale production.

The invention relates to a preparation method of Tovorafenib (Tovorafenib). According to the preparation method disclosed by the invention, HATU is adopted for amidation, so that the reaction time can be effectively shortened, and the yield can be improved; according to the invention, an amino-free compound is selected as an initial raw material, so that the interference of amino on the reaction during amidation is avoided, and the reaction yield is increased; according to the preparation method disclosed by the invention, a cyclic compound is constructed from an initial raw material and then is combined into a target product, the existing commercial compound is selected, key synthesis steps are focused, the operation method is simple and convenient, and the reaction steps are greatly shortened; the post-treatment of the multi-step reaction is simple, and the method is suitable for batch production.

The application discloses a method for preparing mesoporous zeolite under normal temperature and pressure and application thereof, and the preparation method comprises the following steps: (1) preparation of a functional protein biomodule: cationic polypeptide is loaded on yeast to obtain a biomodule aqueous solution; (2) deposition of silicon and aluminum: the pH of the biomodule solution obtained in the step (1) is adjusted to neutral, then a silicon source, an aluminum source and a titanium source are added into the solution, and the solution is incubated on a shaking table for 3 days; (3) calcination: the solid obtained in the step (2) is collected by centrifugation, washed with ethanol and water alternately for 3 times, and calcined at 500 DEG C for 4h under an air atmosphere to obtain a zeolite molecular sieve adsorption material. The application can prepare porous molecular sieve small balls by using a simple method, and can provide a brand-new thought for synthesizing molecular sieve materials.

The invention belongs to the technical field of materials, and relates to a high-performance PCR composite material and a preparation method thereof, the high-performance PCR composite material comprises 10-20 parts of polyethylene, 0.1-0.5 part of an initiator, 0.1-0.5 part of a catalyst, 50-60 parts of a PCR return material, 10-20 parts of TPU, HEMA and 5-10 parts of an antioxidant. The preparation method comprises the following steps: (1) blending the PCR return material with polyethylene to obtain a blend; (2) mixing HEMA (hydroxyethyl methacrylate), TPU (thermoplastic polyurethane), an initiator and a catalyst, and reacting to obtain HEMA-g-TPU; the blend and HEMA-g-TPU are subjected to plasma activation, and a modified blend and modified HEMA-g-TPU are obtained; and (3) adding the modified blend and the modified HEMA-g-TPU into a twin-screw extruder, adding an antioxidant, and processing by the extruder to obtain the high-performance PCR composite material particles. The problem that the mechanical property of the PCR returned material is insufficient can be effectively solved.

The invention discloses a simple method for preparing aldehyde in N, N-dimethylformamide by using halogenated hydrocarbon under the promotion of metal samarium and manganese chloride. The preparation method comprises the following steps: adding halogenated hydrocarbon into N, N-dimethylformamide while stirring, and then sequentially adding metal samarium powder and manganese chloride powder; the reaction system is carried out under an anhydrous condition. Stirring at room temperature until the reaction is complete; and carrying out solvent recovery on the obtained reaction mixed solution. And carrying out column chromatography separation on the crude product, and distilling to remove the solvent to obtain aldehyde, wherein the yield is 60-95%.

The present invention relates to artificial intelligence technology, and discloses a data skew correction method, including: receiving a data skew correction instruction input by a user, extracting an original data set from multiple servers according to the data skew correction instruction, performing data amplification processing and adding random number processing on the original data set to obtain a data set to be partitioned, performing a partition operation on the data set to be partitioned to obtain a partitioned data set, performing statistics on the partitioned data set based on a pre-built tuple evaluation model to obtain a tuple partitioned data set, performing data skew correction on the tuple partitioned data set using a partition correction algorithm and redistributing it to the multiple servers to complete the data skew correction. The present invention also proposes a data skew correction device and a computer-readable storage medium. The present invention can realize an accurate and efficient data skew correction function.

The invention discloses a method for preparing phenyl acetate with high selectivity. A phosphoric acid solution is added into a magnesium chloride solution, stirring and heating are performed to obtain a suspension, the suspension is dried to constant weight to obtain a white solid, the white solid is ground to obtain powder, and the powder is calcined to obtain the catalyst. Then mixing phenol and a catalyst, placing the mixture in an oil bath for reflux reaction, dropwise adding acetic anhydride, distilling after the reaction is finished, and collecting a fraction at 190-195 DEG C, namely phenyl acetate. According to the magnesium chloride loaded phosphoric acid type catalyst (MgCl2-H3PO4) prepared by the method disclosed by the invention, phenol and acetic anhydride react without a solvent, MgCl2-H3PO4 is a solid catalyst, can be recycled only by filtering and can be repeatedly used after being washed, and MgCl2-H3PO4 also improves the selectivity of phenyl acetate and reduces the production cost.