Catalyst for synthesizing vinyl acetate by acetylene method as well as preparation method and application of catalyst

Abstract

The invention discloses a catalyst for acetylene method synthesis of vinyl acetate, a preparation method and application thereof, and relates to the technical field of acetylene gas phase method synthesis of vinyl acetate, in the preparation process of the catalyst, a mixed solvent is used for dissolving an active component, then a carrier is impregnated, the volume of water in the mixed solvent is 20-95%, and the volume of water in the carrier is 20-95%; the residual volume is one or a mixture of two of methanol, ethanol, n-propanol, isopropanol, n-butanol and isobutanol, or a mixture of three or more than three solvents. The solvent can significantly reduce the polarity of the solution, and experiments and characterization show that the agglomeration of the active components is significantly reduced, the dispersion of the active components is enhanced, and the performance of the catalyst is improved.

Description

Technical Field

[0001] This invention relates to the field of acetylene gas-phase synthesis of vinyl acetate, specifically to catalysts, preparation methods, and applications for acetylene-based vinyl acetate synthesis. Background Technology

[0002] Vinyl acetate, abbreviated as VAc, is a widely used chemical material, ranking among the top 50 producers globally. Due to the unsaturated bonds in its structure, VAc exhibits strong self-polymerization and polymerization applications with other compounds, thus possessing a wide range of uses. Downstream applications of VAc typically include the production of vinyl acetate-vinyl chloride copolymer (EVC), vinyl acetate-ethylene copolymer emulsion (VAE), polyvinyl alcohol (PVA), copolymer resin (EVA), polyvinyl acetate (PVAc), and acetal resins, among other derivatives. With technological research and development and industrial upgrading, its downstream products are widely used in the automotive, photovoltaic, real estate, and synthetic fiber industries. VAc is one of the core raw materials for EVA, but domestic supply has seen very little new capacity addition. Furthermore, considering the overall supply and demand situation in the industry, the supply of EVA photovoltaic materials has been extremely tight in recent years. With the implementation of waste sorting and the improvement of environmental laws in recent years, national requirements for environmentally friendly packaging are also increasing annually. Considering various factors, a significant gap is expected in the demand for downstream products such as VAE and EVA from vinyl acetate.

[0003] Vac production processes can be categorized by raw material source into acetylene and ethylene methods. In countries rich in oil resources, the ethylene method is generally used; however, in countries rich in coal and natural gas resources such as Russia, China, and South Africa, the acetylene method is used. Especially in my country, over 70% of Vac production uses the acetylene method. The acetylene method for Vac production has the following advantages: lower initial investment, simpler technology, and a wider range of raw material sources, generally using purified calcium carbide acetylene or natural gas as raw materials. In the acetylene method for Vac production, the activity of the catalyst varies depending on the metal active component it supports, arranged in the following order of activity: Hg > Bi > Cd > Zn > Ni > Mg > Co > Fe > Ca > Ba. Hg itself is highly toxic and causes serious environmental pollution. According to the Minamata Convention, the use of thermometers and sphygmomanometers containing Hg has been banned in China this year. In the PVC industry, Hg catalysts are expected to be phased out by 2025. Bi and Cd are expensive, so zinc acetate (Zn(OAc)2) is currently used as the active component of catalysts in industry. The catalyst used in industrial production is Zn(OAc)2 supported on activated carbon (AC). This catalyst has a single-pass conversion rate of 12%~16% for acetylene and 25%~40% for acetic acid, and its lifespan is generally low. The low catalytic activity and stability are difficult to meet industrial requirements.

[0004] The loading of the active component has a significant impact on the catalytic activity and lifetime of the catalyst. For Zn(OAc)₂ / AC catalysts, some researchers have studied the relationship between loading and catalyst performance, suggesting that there is an optimal value for the loading of Zn(OAc)₂. Akio Mitsutani et al. found that when Zn(OAc)₂ is loaded... 2 / When the Zn(OAc)2 content in the AC catalyst reaches a certain value (25-35g of Zn(OAc)2 is adsorbed on every 100g of AC), the active component is uniformly distributed on the surface of the activated carbon in a monolayer state, and the catalyst performance is optimal.

[0005] In the field of Vac synthesis via acetylene, some researchers have explored alternative approaches by modifying the active components of catalysts used in acetylene-based Vac production. A research laboratory in the United States developed a novel Zn-containing catalyst, using ZnSiF6 as the new active component. This catalyst performed well in laboratory-level tests, lowering the reactor reaction temperature and increasing the conversion rate of raw materials compared to the prepared Zn(OAc)2 / AC. It also exhibited advantages such as less decomposition and less coking of byproducts. However, due to the presence of fluorine (F) in the catalyst, pilot-scale production was not conducted. Japanese scholar Saburo Miyazawa developed a series of catalysts with oxides as active components, such as binary and ternary oxides like V₂O₅-ZnO, Fe₂O₃-ZnO, 16ZnO-32Fe₂O₃-V₂O₅, and 24ZnO-8Cr₂O₃-V₂O₅. Laboratory tests at a reaction temperature of 250℃ showed that the catalytic activity of these oxides was significantly higher than that of the laboratory-prepared Zn(OAc)₂ / AC catalyst. However, the excessively high reaction temperature led to higher production costs and a rapid decline in catalyst activity, ultimately preventing the industrial-scale application of this catalyst. In 1986, the Jilin Chemical Fiber Research Institute in my country developed a ZnO-ZnCl₂ / AC catalyst. This catalyst used ZnO as the main catalyst, ZnCl₂ as a co-catalyst, and AC as a support. It was prepared using a series of physicochemical methods and pilot-scale testing was conducted. However, due to the release of Cl₂ during the reaction... - Free Cl - The catalyst has a severe corrosive effect on equipment, which makes it unsuitable for industrial application.

[0006] The support is a crucial component of a catalyst, serving not only as a dispersant and support for the active component. This research focuses on typical gas-solid reactions, which are interfacial reactions. The active component of the catalyst generally requires a support with a sufficiently large specific surface area to disperse it. The support also prevents the active component from partially melting or recrystallizing, effectively isolating microcrystals and preventing Oswald ripening and agglomeration at high temperatures. Furthermore, the support imparts mechanical strength to the catalyst, preventing breakage or pulverization during use, thereby reducing catalyst bed resistance and ensuring uniform fluid distribution within the reactor.

[0007] Due to their low mechanical strength and tendency to accumulate carbon on their surfaces at high temperatures, many researchers have focused their efforts on surface structure modification, surface chemical property modification, and the development of non-activated carbon supports. Many experts have attempted to use non-activated carbon materials, such as molecular sieves, alumina, derived carbon, and porous carbon microspheres, as supports to replace activated carbon. Xu Hang et al. used mesoporous molecular sieves as catalyst supports and loaded Zn(OAc)₂ ionic liquids as the active component to obtain a novel catalyst (SILC) with excellent stability. Wu Xueyi et al. prepared a Zn(OAc)₂ / AC-γ-Al₂O₃ catalyst with a composite support, which showed a nearly 13% increase in space-time yield compared to the Zn(OAc)₂ / AC catalyst under the same reaction conditions. Shao Shouyan et al. used resin microspheres obtained by copolymerizing acrylonitrile and vinylidene chloride, and obtained a derived carbon support through high-temperature calcination. The active component of the catalyst remained Zn(OAc)₂, and this type of catalyst exhibited good mechanical strength. The active component of the catalyst remains Zn(OAc)₂, and this type of catalyst exhibits good mechanical strength. Jiang Yongzhou et al. used carbon microspheres as catalyst supports and employed an excess impregnation method to load the active component Zn(OAc)₂ onto them, preparing catalysts with different loading amounts. They also investigated the effects of various variables on the catalyst activity and analyzed the causes of catalyst deactivation.

[0009] Catalysts generally consist of an active component and a support, and impregnation is one of the most common methods for catalyst preparation. Researchers typically dissolve the active component in a solvent to prepare a solution, which is then loaded onto a support. In this process, the solvent acts as a bridge between the active component and the support, playing a crucial role. We note that water is the most common solvent in catalyst production, while activated carbon, being a non-polar material, presents a significant polarity difference. Activated carbon is hydrophobic, and when used as a support, the loaded active component content is relatively low, making it prone to agglomeration and uneven dispersion. Summary of the Invention

[0010] The purpose of this invention is to provide a catalyst for the synthesis of vinyl acetate by the acetylene process, a preparation method thereof, and its application. One of the technical problems to be solved by this invention is that the active components in the acetylene process for the synthesis of vinyl acetate are poorly dispersed on the support and have a low loading. The low loading and poor dispersion of the active components directly lead to a low catalyst conversion rate.

[0011] The second technical problem to be solved by the present invention is to provide a method for preparing a catalyst corresponding to one of the above-mentioned technical problems.

[0012] The third technical problem to be solved by the present invention is to provide a method for synthesizing vinyl acetate using the catalyst described in one of the above-mentioned technical problems.

[0013] To achieve the above objectives, the present invention provides the following technical solution: a catalyst for the synthesis of vinyl acetate by the acetylene method, wherein the active component is dissolved in a mixed solvent during the catalyst preparation process, and then the support is impregnated. The volume of water in the mixed solvent is between 20-95%, and the remaining volume is a mixture of one or two of methanol, ethanol, n-propanol, isopropanol, n-butanol, and isobutanol, or a mixture of three or more solvents.

[0014] As a further preferred embodiment of the present invention: the mixed solvent is a mixture of methanol and water in a certain proportion, wherein the volume of water is between 20-95%; or the mixed solvent is a mixture of ethanol and water in a certain proportion, wherein the volume of water is between 20-95%; or the mixed solvent is a mixture of n-propanol and water in a certain proportion, wherein the volume of water is between 20-95%; or the mixed solvent is a mixture of isopropanol and water in a certain proportion, wherein the volume of water is between 20-95%; or the mixed solvent is a mixture of n-butanol and water in a certain proportion, wherein the volume of water is between 20-95%; or the mixed solvent is a mixture of isobutanol and water in a certain proportion, wherein the volume of water is between 20-95%.

[0015] As a further preferred embodiment of the present invention: the carrier is activated carbon, the active component is zinc acetate, and the water used to dissolve the zinc acetate is replaced with a mixed solvent.

[0016] As a further preferred embodiment of the present invention: zinc acetate is dissolved in a mixed solvent, and then a carrier is added, wherein the mass ratio of the active component: carrier: mixed solvent is 1:1-2:5-30.

[0017] As a further preferred embodiment of the present invention, the zinc content in the catalyst is 3-40%.

[0018] A method for preparing a catalyst for the acetylene-to-vinyl acetate synthesis process, the method comprising the following steps: S1. Treat the carrier: Select commercially available activated carbon as the carrier and perform impurity and ash removal treatment; S2. Prepare a mixed solvent by mixing water in a mixed solvent with a volume of 20-95% and the remaining volume consisting of one or two of methanol, ethanol, n-propanol, isopropanol, n-butanol, and isobutanol, or by mixing three or more solvents. S3. Take a certain mass of zinc acetate, and dissolve the zinc acetate in the mixed solvent according to the mass ratio of active component: support: mixed solvent of 1:1-2:5-30. Then add the support and mix the catalyst preparation materials. S4. After dissolving, mechanically stir for 12-24 hours; S5. After stirring, dry the mixture at 80℃ for 12-24 hours. S6. After the material has cooled, it is loaded into the reactor, and a fixed bed or fluidized bed reactor is selected.

[0019] A method for producing vinyl acetate, wherein vinyl acetate is synthesized using a catalyst prepared by the above-mentioned preparation method, with acetic acid and acetylene as raw materials, under the catalyst.

[0020] As a further preferred embodiment of the present invention: the raw material composition is acetylene:acetic acid = (1-12):1 in molar ratio, the reaction temperature is controlled at 165℃-235℃, and the pressure is normal.

[0021] The beneficial effects of this invention are as follows: 1. It reduces the overall polarity of the solution, making the overall polarity closer to that of activated carbon.

[0022] 2. It greatly improves the dispersibility of active components on the carrier and increases the loading capacity.

[0023] 3. The catalyst preparation process is simple, low in cost, and has good activity.

[0024] In summary, the catalyst for the synthesis of vinyl acetate by the acetylene process provided by this invention can significantly reduce the solvent polarity of the solution. Through experiments and characterization, it was found that the aggregation of the active components was significantly reduced, the dispersion of the active components was enhanced, and the catalyst performance was improved. Attached Figure Description

[0025] Figure 1 This represents the contact angle between the mixed solvent and activated carbon in an embodiment of the present invention.

[0026] Figure 2 This is a mapping diagram of the pure water prepared in the embodiments of the present invention.

[0027] Figure 3This is a mapping diagram of the mixed solvent prepared in the embodiments of the present invention.

[0028] Figure 4 This is a performance diagram of the catalyst prepared using a mixed solvent in an embodiment of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Reference Figures 1-4 A catalyst for the synthesis of vinyl acetate by the acetylene process, wherein the active component is dissolved in a mixed solvent during the catalyst preparation process, and then the support is impregnated. The volume of water in the mixed solvent is between 20-95%, and the remaining volume is a mixture of one or two of methanol, ethanol, n-propanol, isopropanol, n-butanol, and isobutanol, or a mixture of three or more solvents.

[0031] The preparation methods include the following: Weigh a certain mass of alcohol, add a certain amount of water, and prepare a mixed solvent; Weigh a certain mass of zinc acetate and add it to the above mixed solvent; Weigh a certain amount of activated carbon and add it to the above zinc acetate solution. Mix mechanically for a period of time. Place the mixture obtained after stirring in a drying oven to allow the moisture in it to evaporate and dry. The dried material is mechanically crushed or thoroughly ground. When the obtained catalyst is loaded into the reactor to prepare vinyl acetate by the acetylene gas-phase method, it is necessary to first activate it with acetic acid for a period of time before introducing acetylene to carry out the reaction.

[0032] Example 1 A method for preparing a catalyst for the acetylene-to-vinyl acetate synthesis process and its application includes the following steps: 2 L of methanol and 18 L of water are measured using a graduated cylinder and mixed. 1 kg of zinc acetate is weighed to prepare a mixed solvent A. The weighed zinc acetate is placed in the mixed solvent and mechanically stirred at room temperature to ensure thorough mixing. Then, 1 kg of activated carbon is weighed and added to the prepared solution. After stirring for 24 hours, the resulting mixture is placed in an oven for drying. After thorough drying, the material is removed and mechanically crushed. The crushed material is placed in a reactor, activated first by acetic acid vapor, and then acetylene is introduced. The reaction conditions are: reaction temperature 165-235℃, and feed volume hourly space velocity (VHSV) 300-900 h⁻¹. -1 The raw material composition is acetylene:acetic acid molar ratio of 1-12:1. Under the above conditions, the catalyst catalyzes the gas-phase preparation of vinyl acetate from acetylene, with an acetic acid conversion rate of 68%.

[0033] Example 2 A method for preparing a catalyst for the acetylene-to-vinyl acetate synthesis process and its application includes the following steps: 1 L of methanol, 1 L of ethanol, and 18 L of water are measured using a graduated cylinder and mixed. 1 kg of zinc acetate is then weighed to obtain a mixed solvent B. The weighed zinc acetate is placed in the mixed solvent and mechanically stirred at room temperature to ensure thorough mixing. 1 kg of activated carbon is then weighed and added to the prepared solution. After stirring for 24 hours, the resulting mixture is placed in an oven for drying. After thorough drying, the material is removed and mechanically crushed. The crushed material is placed in a reactor, activated first by acetic acid vapor, and then acetylene is introduced. The reaction conditions are a reaction temperature of 165-235℃ and a feed volume hourly space velocity of 300-900 h⁻¹. -1 The raw material composition is acetylene:acetic acid molar ratio of 1-12:1. Under the above conditions, the catalyst catalyzes the gas-phase preparation of vinyl acetate from acetylene, with an acetic acid conversion rate of 60%.

[0034] Example 3 A method for preparing a catalyst for the acetylene-to-vinyl acetate synthesis process and its application includes the following steps: 1 L of methanol, 1 L of ethanol, 1 L of n-butanol, and 17 L of water are measured using a graduated cylinder and mixed. 1 kg of zinc acetate is then weighed to obtain a mixed solvent C. The weighed zinc acetate is placed in the mixed solvent and mechanically stirred at room temperature to ensure thorough mixing. 1 kg of activated carbon is then weighed and added to the prepared solution. After stirring for 24 hours, the resulting mixture is placed in an oven for drying. After thorough drying, the material is removed and mechanically crushed. The crushed material is placed in a reactor, activated first by acetic acid vapor, and then acetylene is introduced. The reaction conditions are a reaction temperature of 165-235℃ and a feed volume hourly space velocity of 300-900 h⁻¹. -1The raw material composition is acetylene:acetic acid molar ratio of 1-12:1. Under the above conditions, the catalyst catalyzes the gas-phase preparation of vinyl acetate from acetylene, with an acetic acid conversion rate of 47%.

[0035] Example 4 A method for preparing a catalyst for the acetylene-to-vinyl acetate synthesis process and its application are disclosed, comprising the following steps: 1 L of ethanol, 1 L of n-propanol, 1 L of isobutanol, and 17 L of water are measured using a graduated cylinder and mixed. 1 kg of zinc acetate is then weighed to obtain a mixed solvent D. The weighed zinc acetate is placed in the mixed solvent and mechanically stirred at room temperature to ensure thorough mixing. 1 kg of activated carbon is then weighed and added to the prepared solution. After stirring for 24 hours, the resulting mixture is placed in an oven for drying. After thorough drying, the material is removed and mechanically crushed. The crushed material is placed in a reactor, activated first by acetic acid vapor, and then acetylene is introduced. The reaction conditions are a reaction temperature of 165-235℃ and a feed volume hourly space velocity of 300-900 h⁻¹. -1 The raw material composition is acetylene:acetic acid molar ratio of 1-12:1. Under the above conditions, the catalyst catalyzes the gas-phase preparation of vinyl acetate from acetylene, with an acetic acid conversion rate of 45%.

[0036] Example 5 A method for preparing a catalyst for the acetylene-to-vinyl acetate synthesis process and its application includes the following steps: 1 L of methanol, 1 L of n-propanol, 1 L of isobutanol, and 17 L of water are measured using a graduated cylinder and mixed. 1 kg of zinc acetate is then weighed and placed in the mixed solvent. The mixture is mechanically stirred at room temperature until the zinc acetate solution is thoroughly mixed. 1 kg of activated carbon is then weighed and added to the prepared solution. After stirring for 24 hours, the resulting mixture is placed in an oven for drying. After thorough drying, the material is removed and mechanically crushed. The crushed material is placed in a reactor, activated first by acetic acid vapor, and then acetylene is introduced. The reaction conditions are a reaction temperature of 165-235℃ and a feed volume hourly space velocity of 300-900 h⁻¹. -1 The raw material composition is acetylene:acetic acid molar ratio of 1-12:1. Under the above conditions, the catalyst catalyzes the gas-phase preparation of vinyl acetate from acetylene, with an acetic acid conversion rate of 40%.

[0037] Example 6 A method for preparing a catalyst for the acetylene-to-vinyl acetate synthesis process and its application includes the following steps: 1 L of methanol, 1 L of n-propanol, 1 L of isopropanol, 1 L of n-butanol, and 16 L of water are measured using a graduated cylinder and mixed. 1 kg of zinc acetate is then weighed and placed in the mixed solvent. The mixture is mechanically stirred at room temperature until the zinc acetate solution is thoroughly mixed. 1 kg of activated carbon is then weighed and added to the prepared solution. After stirring for 24 hours, the resulting mixture is dried in an oven. After thorough drying, the material is removed and mechanically crushed. The crushed material is placed in a reactor, activated first by acetic acid vapor, and then acetylene is introduced. The reaction conditions are: reaction temperature 165-235℃, and feed volume hourly space velocity (VHSV) 300-900 h⁻¹. -1 The raw material composition is acetylene:acetic acid molar ratio of 1-12:1. Under the above conditions, the catalyst catalyzes the gas-phase preparation of vinyl acetate from acetylene, with an acetic acid conversion rate of 38%.

[0038] Example 7 A method for preparing a catalyst for the acetylene-to-vinyl acetate synthesis process and its application includes the following steps: 1 L of ethanol, 1 L of n-propanol, 1 L of n-butanol, 1 L of isobutanol, and 16 L of water are measured using a graduated cylinder and mixed. 1 kg of zinc acetate is then weighed and placed in the mixed solvent. The mixture is mechanically stirred at room temperature until the zinc acetate solution is thoroughly mixed. 1 kg of activated carbon is then weighed and added to the prepared solution. After stirring for 24 hours, the resulting mixture is dried in an oven. Once fully dried, the material is removed and mechanically crushed. The crushed material is then placed in a reactor, activated first by acetic acid vapor, and then acetylene is introduced. The reaction conditions are: reaction temperature 165-235℃, and feed volume hourly space velocity (VHSV) 300-900 h⁻¹. -1 The raw material composition is acetylene:acetic acid molar ratio of 1-12:1. Under the above conditions, the catalyst catalyzes the gas-phase preparation of vinyl acetate from acetylene, with an acetic acid conversion rate of 35%.

[0039] Table 1. Conversion rate of acetic acid in different mixed solvents Example Mixed solvents Acetic acid conversion rate Example 1 2L methanol, 18L water 68% Example 2 1L methanol, 1L ethanol, 18L water 60% Example 3 1L methanol, 1L ethanol, 1L n-butanol, 17L water 47% Example 4 1L ethanol, 1L n-propanol, 1L isobutanol, 17L water 45% Example 5 1L methanol, 1L n-propanol, 1L isobutanol, 17L water 40% Example 6 1L methanol, 1L n-propanol, 1L isopropanol, 1L n-butanol, 16L water 38% Example 7 1L ethanol, 1L n-propanol, 1L n-butanol, 1L isobutanol, 16L water 35% In summary, catalysts in which water constitutes 20-95% of the volume of the mixed solvent, and the remaining volume consists of one or two of methanol, ethanol, n-propanol, isopropanol, n-butanol, and isobutanol, or a mixture of three or more solvents, are used to catalyze the gas-phase preparation of vinyl acetate from acetylene, achieving an acetic acid conversion rate of 35-68%. The polarity of the solvents can be determined by contact angle testing, i.e., pure water > mixed solvent A > mixed solvent B > mixed solvent C > mixed solvent D.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A catalyst for the synthesis of vinyl acetate by the acetylene method, characterized in that: The active component is dissolved in the mixed solvent during the preparation of the catalyst, and then the carrier is impregnated, wherein the volume of water in the mixed solvent is between 20-95%, and the remaining volume is one or two of methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, or three or more solvents are mixed.

2. The catalyst for the synthesis of vinyl acetate by acetylene method according to claim 1, characterized by that: The mixed solvent is mixed with methanol and water in a certain proportion, wherein the volume of water is between 20-95%; or the mixed solvent is mixed with ethanol and water in a certain proportion, wherein the volume of water is between 20-95%; or the mixed solvent is mixed with n-propanol and water in a certain proportion, wherein the volume of water is between 20-95%; or the mixed solvent is mixed with isopropanol and water in a certain proportion, wherein the volume of water is between 20-95%; or the mixed solvent is mixed with n-butanol and water in a certain proportion, wherein the volume of water is between 20-95%; or the mixed solvent is mixed with isobutanol and water in a certain proportion, wherein the volume of water is between 20-95%.

3. The catalyst for the synthesis of vinyl acetate by acetylene method according to claim 1, characterized by that: The carrier is activated carbon, and the active component is zinc acetate. The water used to dissolve zinc acetate is replaced with a mixed solvent.

4. The catalyst for the synthesis of vinyl acetate by acetylene method according to claim 3, characterized by that: Zinc acetate is dissolved in a mixed solvent, and then the carrier is added, wherein the mass ratio of the active component: carrier: mixed solvent is 1:1-2:5-30.

5. The catalyst for the synthesis of vinyl acetate by acetylene method according to claim 1, characterized by that: The content of zinc in the catalyst is 3-40%.

6. A process for the preparation of a catalyst for the synthesis of vinyl acetate by the acetylene method, characterized in that: The preparation method of the catalyst according to any one of claims 1-5 comprises the following steps: S1. The carrier is treated: a commercial activated carbon is selected as the carrier, and impurity removal and ash removal treatment are performed; S2. A mixed solvent is prepared according to the following: the volume of water in the mixed solvent is between 20-95%, and the remaining volume is one or two of methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, or three or more solvents are mixed; S3. A certain amount of zinc acetate is taken, and the mass ratio of the active component: carrier: mixed solvent is 1:1-2:5-30. Zinc acetate is dissolved in the mixed solvent, and then the carrier is added. The preparation materials of the catalyst are mixed and stirred; S4. After dissolution, mechanical stirring is performed, and the stirring time is 12-24 hours; S5. After stirring, drying treatment is performed, and the treatment temperature is 80°C. The drying time is 12-24 hours; S6. After the material cools down, it is loaded into a reactor, and a fixed bed or a fluidized bed reactor is selected.

7. A process for the production of vinyl acetate, characterized by: The catalyst prepared by the preparation method of claim 6 is used to synthesize vinyl acetate from acetic acid and acetylene as raw materials.

8. The method of producing vinyl acetate according to claim 7, characterized by: The molar ratio of the raw materials is acetylene: acetic acid = (1-12):1, and the reaction temperature is controlled at 165-235°C under normal pressure.

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