High-purity monovinyl alcohol ether as well as preparation method and application thereof

Abstract

The invention discloses high-purity monovinyl alcohol ether as well as a preparation method and application thereof. The preparation method comprises the steps that a mixed system containing a catalyst and dihydric alcohol is subjected to vacuum dehydration treatment, then ethylene and oxygen are introduced for a reaction, the high-purity monovinyl alcohol ether is prepared, and the catalyst comprises palladium chloride and IB group metal chloride. The preparation method provided by the invention can effectively avoid side reaction, has high conversion rate, few byproducts and higher reaction selectivity and safety, and the prepared monovinyl alcohol ether has high purity and can be widely applied to the field of synthesis of polyether.

Description

Technical Field

[0001] This invention belongs to the technical field of monovinyl alcohol ethers, specifically relating to a high-purity monovinyl alcohol ether, its preparation method, and its application. Background Technology

[0002] Ethylene glycol monoethylene ether, diethylene glycol monoethylene ether, and 1,4-butanediol monoethylene ether are all vinyl ether compounds. They are colorless and transparent liquids that can be used as reactive diluents and crosslinking agents for UV cationic curing coatings. They can adjust the viscosity of the coating and improve its final performance. Compared with traditional acrylates, vinyl ethers are less toxic, have a higher flash point, are odorless, and are safer and more efficient. They can also be used as crosslinking agents and solvents to improve the curing effect and performance of paints. As a stabilizer, vinyl ethers help maintain the stability of industrial circulating water and reduce scaling and corrosion. Currently, they are widely used as polycarboxylate superplasticizer polyether monomer initiators in high-speed rail projects, cross-sea bridges, nuclear power dams, and skyscrapers.

[0003] Ethylene glycol monovinyl ether, diethylene glycol monovinyl ether, and 1,4-butanediol monovinyl ether are typically produced industrially by reacting acetylene with ethylene glycol, diethylene glycol, and 1,4-butanediol under alkaline catalysis. The reaction temperature is usually between 150-180°C, and the reaction can be carried out under normal or pressurized conditions. Due to the small distance between the two hydroxyl groups, the resulting monovinyl alcohol ether continues to react with acetylene to form divinyl alcohol ether, resulting in low conversion and low selectivity, which poses a challenge to the industrial production of monovinyl alcohol ethers.

[0004] Therefore, there is an urgent need to develop a method for preparing monovinyl alcohol ethers that can effectively avoid the generation of byproducts, has high selectivity, high conversion rate and short reaction cycle. Summary of the Invention

[0005] The main objective of this invention is to provide a high-purity monovinyl alcohol ether, its preparation method, and its application, in order to overcome the shortcomings of the prior art.

[0006] To achieve the aforementioned objectives, the technical solution adopted by this invention includes:

[0007] The first aspect of the present invention provides a method for preparing high-purity monovinyl alcohol ether, comprising: subjecting a mixed system containing a catalyst and a diol to vacuum dehydration treatment, followed by introducing ethylene and oxygen to react and obtain high-purity monovinyl alcohol ether, wherein the catalyst comprises palladium chloride and a Group IB metal chloride.

[0008] A second aspect of the present invention provides a high-purity monovinyl alcohol ether prepared by the above-described preparation method.

[0009] A third aspect of the invention provides the application of the high-purity monovinyl alcohol ether in the field of polyether synthesis.

[0010] Compared with the prior art, the present invention has at least the following beneficial effects:

[0011] (1) The method for preparing high-purity monovinyl alcohol ether provided by the present invention is simple, has low energy consumption, can effectively reduce the synthesis time of monovinyl alcohol ether, and has good economic benefits.

[0012] (2) The method for preparing high-purity monovinyl alcohol ether provided by the present invention can effectively avoid the occurrence of side reactions, has a high conversion rate, few by-products, and has high reaction selectivity and safety.

[0013] (3) The method for preparing high-purity monovinyl alcohol ether provided by the present invention is to polymerize ethylene with diol and oxygen under high temperature and high pressure. The raw materials are safe, the process route is green and efficient, the product conversion rate is high, and the distillation product has high purity. It can be widely used in the synthesis of various polyethers. Detailed Implementation

[0014] In view of the problems existing in the prior art, the inventors of this invention have conducted extensive and in-depth research and have provided a high-purity monovinyl alcohol ether, its preparation method and application. The method mainly involves using ethylene and diol as the main raw materials, continuously introducing oxygen into a fluidized bed, and generating high-purity monovinyl alcohol ether under the catalytic action of palladium chloride and Group IB metals.

[0015] The following will provide a further explanation of the technical solution, its implementation process, and its principles.

[0016] The first aspect of the present invention provides a method for preparing high-purity monovinyl alcohol ether, comprising: subjecting a mixed system containing a catalyst and a diol to vacuum dehydration treatment, followed by introducing ethylene and oxygen to react and obtain high-purity monovinyl alcohol ether, wherein the catalyst comprises palladium chloride and a Group IB metal chloride.

[0017] In some embodiments, the total Pd content in the mixture is 3–12 g / L. In this invention, a total Pd content within this range can significantly reduce the impurity content of monovinyl alcohol ethers in the product.

[0018] Furthermore, the total Pd content in the mixed system is 5–10 g / L. Within this preferred range, the generation of impurities can be further reduced.

[0019] In some embodiments, the content of Group IB metals in the mixture is 1–5 g / L. In this invention, the content of Group IB metals within this parameter range can significantly reduce the impurity content of divinyl alcohol ethers in the product.

[0020] Furthermore, the content of Group IB metals in the mixed system is 2–4 g / L. Within this preferred range, the generation of impurities can be further reduced.

[0021] In some embodiments, the Group IB metal chloride contains at least one of the Group IB metal elements: Ag, Au, and Cu.

[0022] Furthermore, the group IB metal chlorides include at least one of AgCl, AuCl3, and CuCl2, but are not limited to this.

[0023] Furthermore, the Group IB metal chloride includes AgCl or AuCl3. In the catalyst of the present invention, the high palladium content in palladium chloride enables it to directly catalyze the oxidation of ethylene and the insertion of diols; the Group IB metal chloride can provide Cl... - Maintaining the Pd coordination environment; regenerating Pd through redox cycles. 2+ This avoids catalyst deactivation and enables a circular economy.

[0024] In some embodiments, the preparation method of the high-purity monovinyl alcohol ether specifically includes: dissolving a catalyst containing palladium chloride and group IB metal chloride in a diol to form the mixed system, evacuating the vacuum, heating to a specified temperature, and performing vacuum dehydration treatment on the mixed system.

[0025] Furthermore, the mass ratio of the diol to the catalyst is 50–81:1.

[0026] Furthermore, the diol includes, but is not limited to, at least one of ethylene glycol, diethylene glycol, and 1,4-butanediol.

[0027] Furthermore, the vacuum degree used in the vacuum dehydration process is -0.01 to -0.10 MPa.

[0028] Furthermore, the temperature is increased to the specified temperature at a rate of 1 to 5 °C / min.

[0029] Furthermore, the specified temperature is 120–150°C. Temperatures below 120°C will result in a longer reaction cycle, while temperatures above 150°C will lead to more impurities being generated.

[0030] Furthermore, the specified temperature is 130–140°C. Within this preferred temperature range, the reaction cycle is more efficient, and the product purity is higher.

[0031] Furthermore, the vacuum dehydration process takes 10 to 30 minutes.

[0032] Furthermore, the water content of the mixed system after vacuum dehydration is less than 10 ppm. In this invention, the main purpose of vacuum dehydration is to reduce the water content of the system and reduce the generation of impurities.

[0033] In some embodiments, the preparation method of the high-purity monovinyl alcohol ether specifically includes: continuously introducing ethylene and oxygen into a mixed system that has undergone vacuum dehydration to carry out the reaction, continuously adding diol during the reaction process, keeping the reaction pressure constant, and obtaining the high-purity monovinyl alcohol ether.

[0034] Furthermore, the molar ratio of the total amount of oxygen, ethylene, and diol is 1:(2-3):(1.8-2.2). If the molar ratio is not within this range, the reaction may easily generate impurities.

[0035] Furthermore, the molar ratio of the total amount of oxygen, ethylene, and diol is 1:(2.2–2.8):(1.9–2.1). Within this preferred range, the purity of the product is higher.

[0036] Furthermore, the reaction temperature is consistent with the specified temperature.

[0037] Furthermore, the reaction pressure is 0.3–0.6 MPa.

[0038] Furthermore, the reaction pressure is 0.4–0.5 MPa.

[0039] Furthermore, the volumetric flow rate of the ethylene is 1200–3200 hr. -1 .

[0040] Furthermore, the volumetric flow rate of the ethylene is 1600–2800 hr. -1 .

[0041] Furthermore, the volumetric flow rate of the oxygen is 600–1600 hr. -1 .

[0042] Furthermore, the volumetric flow rate of the oxygen is 800–1400 hr. -1 .

[0043] Furthermore, the method for preparing the high-purity monovinyl alcohol ether further includes: distilling, condensing, and rectifying the product obtained after the reaction to obtain the high-purity monovinyl alcohol ether.

[0044] In some embodiments, the conversion rate of the high-purity monovinyl alcohol ether is 66-96%.

[0045] In some more specific embodiments, the method for preparing the high-purity monovinyl alcohol ether may include the following steps:

[0046] S1. Dissolve a catalyst containing palladium chloride with a total Pd content of 3-12 g / L and a Group IB metal chloride with a Group IB metal content of 1-5 g / L in a diol to form the mixed system.

[0047] S2. Vacuum the mixture and heat it to the reaction temperature of 120-150°C at a heating rate of 1-5°C / min. Dehydrate the mixture for 10-30 minutes to reduce the water content of the mixture to less than 10 ppm.

[0048] S3. Ethylene and oxygen are continuously introduced into the mixed system after vacuum dehydration to carry out the reaction. Diol is continuously added during the reaction to keep the reaction pressure constant.

[0049] S4. The reaction products obtained are continuously carried out by ethylene and oxygen, and after distillation and condensation, a collection liquid is formed.

[0050] S5. The collected liquid is then distilled to obtain the high-purity monovinyl alcohol ether.

[0051] The method for preparing high-purity monovinyl alcohol ethers provided by this invention can be carried out in a reactor.

[0052] Specifically, the reaction mechanism of the method for preparing high-purity monovinyl alcohol ethers provided in this invention is as follows:

[0053]

[0054] The R group includes any one of CH2CH2, CH2CH2-O-CH2CH2, and CH2CH2CH2CH2.

[0055] A second aspect of the present invention provides a high-purity monovinyl alcohol ether prepared by the above-described preparation method.

[0056] In some embodiments, the high-purity monovinyl alcohol ether includes at least one of ethylene glycol monovinyl ether, diethylene glycol monovinyl ether, and 1,4-butanediol monovinyl ether, but is not limited thereto.

[0057] In some embodiments, the purity of the high-purity monovinyl alcohol ether is ≥99.5%.

[0058] A third aspect of the present invention provides the application of the high-purity monovinyl alcohol ether in the field of polyether synthesis. In the field of polyether synthesis, using the high-purity monovinyl alcohol ether of the present invention as a raw material results in high reactivity, high purity of the obtained polyether product, and good application performance.

[0059] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Modifications or equivalent substitutions made by those skilled in the art based on their understanding of the technical solutions of this invention, without departing from the spirit and scope of the invention, should be covered within the protection scope of this invention.

[0060] For experiments not specifically described in the examples, the procedures or conditions can be performed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available. Other unmentioned raw materials and instruments are all conventionally chosen and do not involve the core technical means of this invention.

[0061] Example 1

[0062] A method for preparing a high-purity monovinyl alcohol ether, with the raw materials having a molar ratio of oxygen:ethylene:total ethylene glycol = 1:2:1.8, includes the following steps:

[0063] S1. Dissolve 0.06 g of palladium chloride and 0.12 g of CuCl2 as catalysts in 0.2 mol of ethylene glycol to form a mixed system; wherein the total Pd content in the mixed system is approximately 3 g / L, and the Cu content of Group IB metal is approximately 5 g / L;

[0064] S2. Add the mixture to the reactor, remove the air in the reactor, set the relative vacuum to -0.01MPa, heat to the specified temperature of 120℃ at a heating rate of 1℃ / min, and perform vacuum dehydration treatment for 30min to make the water content of the system lower than 10ppm.

[0065] S3. 2 mol of ethylene and 1 mol of oxygen are continuously introduced to carry out the reaction, while the temperature remains constant. The ethylene gas flow rate is 1200 h / min. -1 The oxygen gas flow rate is 600 hr. -1 During the reaction, 1.6 mol of ethylene glycol was continuously added to maintain the reaction pressure in the reactor at a constant 0.6 MPa.

[0066] S4. The reaction products are continuously carried out of the reactor by ethylene and oxygen, and after distillation and condensation, a collection liquid is formed, in which the conversion rate of monovinyl glycol ether is 76.00%.

[0067] S5. The collected liquid is distilled to obtain monovinyl glycol ether with a purity of 99.5%.

[0068] Example 2

[0069] A method for preparing a high-purity monovinyl alcohol ether, with the raw materials having a molar ratio of oxygen:ethylene:total ethylene glycol = 1:2.2:2, includes the following steps:

[0070] S1. Dissolve 0.13g palladium chloride and 0.10g AuCl3 as catalysts in 0.3mol ethylene glycol to form a mixed system; wherein the total Pd content in the mixed system is approximately 5g / L, and the Au content of Group IB metal is approximately 4g / L;

[0071] S2. Add the mixture to the reactor, remove the air in the reactor, set the relative vacuum to -0.03MPa, heat to the specified temperature of 130℃ at a heating rate of 2℃ / min, and perform vacuum dehydration treatment for 25min to make the water content of the system less than 10ppm.

[0072] S3. 2.2 mol of ethylene and 1 mol of oxygen are continuously introduced to carry out the reaction, while the temperature remains constant. The volumetric flow rate of ethylene gas is 1600 hr. -1 The oxygen gas flow rate is 800 hr. -1 During the reaction, 1.7 mol of ethylene glycol was continuously added to maintain the reaction pressure in the reactor at a constant 0.4 MPa.

[0073] S4. The reaction products are continuously carried out of the reactor by ethylene and oxygen, and after distillation and condensation, a collection liquid is formed, in which the conversion rate of monovinyl glycol ether is 96.00%.

[0074] S5. The collected liquid is distilled to obtain monovinyl glycol ether with a purity of 99.9%.

[0075] Example 3

[0076] A method for preparing a high-purity monovinyl alcohol ether, with the raw materials having a molar ratio of oxygen:ethylene:diethylene glycol total = 1:2.5:1.9, includes the following steps:

[0077] S1. Dissolve 0.22 g of palladium chloride and 0.08 g of AgCl as catalysts in 0.2 mol of diethylene glycol to form a mixed system; wherein the total Pd content in the mixed system is approximately 7 g / L, and the Ag content of Group IB metals is approximately 3 g / L;

[0078] S2. Add the mixture to the reactor, remove the air in the reactor, set the relative vacuum to -0.05MPa, heat to the specified temperature of 135℃ at a heating rate of 3℃ / min, and perform vacuum dehydration treatment for 20min to make the water content of the system lower than 10ppm.

[0079] S3. 2.5 mol of ethylene and 1 mol of oxygen are continuously introduced to carry out the reaction, while the temperature remains constant and the ethylene gas flow rate is 2000 hr. -1 The oxygen gas flow rate is 1000hr / h -1 During the reaction, 1.7 mol of diethylene glycol was continuously added to maintain the reaction pressure in the reactor at a constant 0.45 MPa.

[0080] S4. The reaction products are continuously carried out of the reactor by ethylene and oxygen, and after distillation and condensation, a collection liquid is formed, in which the conversion rate of monovinyl diethylene glycol ether is 88.00%.

[0081] S5. The collected liquid is distilled to obtain monovinyl diethylene glycol ether with a purity of 99.6%.

[0082] Example 4

[0083] A method for preparing a high-purity monovinyl alcohol ether, with the raw materials having a molar ratio of oxygen:ethylene:total 1,4-butanediol = 1:2.8:2.1, includes the following steps:

[0084] S1. Dissolve 0.15g palladium chloride and 0.03g AuCl3 as catalysts in 0.1mol 1,4-butanediol to form a mixed system; wherein the total Pd content in the mixed system is approximately 10g / L, and the Au content of Group IB metals is approximately 2g / L;

[0085] S2. Add the mixture to the reactor, remove the air in the reactor, set the relative vacuum to -0.08MPa, heat to the specified temperature of 140℃ at a heating rate of 4℃ / min, and perform vacuum dehydration treatment for 15min to make the water content of the system lower than 10ppm.

[0086] S3. 2.8 mol of ethylene and 1 mol of oxygen are continuously introduced to carry out the reaction, while the temperature remains constant and the ethylene gas flow rate is 2800 hr. -1 The oxygen gas flow rate is 1400 hr. -1 During the reaction, 2 mol of 1,4-butanediol was continuously added to maintain the reaction pressure in the reactor at a constant 0.5 MPa.

[0087] S4. The reaction products are continuously carried out of the reactor by ethylene and oxygen, and after distillation and condensation, a collection liquid is formed, in which the conversion rate of 1,4-butanediol monovinyl ether is 82.00%.

[0088] S5. The collected liquid is distilled to obtain 1,4-butanediol monovinyl ether with a purity of 99.7%.

[0089] Example 5

[0090] A method for preparing a high-purity monovinyl alcohol ether, with the raw materials having a molar ratio of oxygen:ethylene:total diethylene glycol = 1:3:2.2, includes the following steps:

[0091] S1. Dissolve 0.38 g of palladium chloride and 0.04 g of CuCl2 as catalysts in 0.2 mol of diethylene glycol to form a mixed system; wherein the total Pd content in the mixed system is approximately 12 g / L, and the Cu content of Group IB metal is approximately 1 g / L;

[0092] S2. Add the mixture to the reactor, remove the air in the reactor, set the relative vacuum to -0.10MPa, heat to the specified temperature of 150℃ at a heating rate of 5℃ / min, and perform vacuum dehydration treatment for 10min to make the water content of the system lower than 10ppm.

[0093] S3. 3 mol of ethylene and 1 mol of oxygen are continuously introduced to carry out the reaction, while the temperature remains constant. The ethylene gas flow rate is 3200 hr⁻¹. 1 The oxygen gas volumetric flow rate is 1600 hr- 1 During the reaction, 2 mol of diethylene glycol was continuously added to keep the reaction pressure in the reactor constant at 0.3 MPa.

[0094] S4. The reaction products are continuously carried out of the reactor by ethylene and oxygen, and after distillation and condensation, a collection liquid is formed, in which the conversion rate of monovinyl diethylene glycol ether is 66.0%.

[0095] S5. The collected liquid is distilled to obtain monovinyl diethylene glycol ether with a purity of 99.8%.

[0096] Comparative Example 1

[0097] The method for preparing high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that the molar ratio of each raw material is oxygen: ethylene: ethylene glycol = 1:3.2:1.5, i.e., 1 mol of oxygen, 3.2 mol of ethylene, and 1.5 mol of ethylene glycol.

[0098] The monovinyl glycol ether content in the collected liquid was 55.00%, and the purity of the monovinyl glycol ether after distillation was 95.6%.

[0099] Comparative Example 2

[0100] The method for preparing a high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that:

[0101] The molar ratio of each raw material is oxygen: ethylene: ethylene glycol = 1:1.8:2.5. That is, 1 mol of oxygen, 1.8 mol of ethylene, and 2.5 mol of ethylene glycol.

[0102] The collected liquid contained 50.0% monovinyl glycol ether, and the purity of the monovinyl glycol ether after distillation was 90.8%.

[0103] Comparative Example 3

[0104] The method for preparing a high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that the reaction temperature is adjusted to 100°C.

[0105] The monovinyl glycol ether content in the collected liquid was 45.00%, and the purity of the monovinyl glycol ether after distillation was 93.2%.

[0106] Comparative Example 4

[0107] The method for preparing high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that the reaction pressure is adjusted to 0.7 MPa.

[0108] The monovinyl glycol ether content in the collected liquid was 56.00%, and the purity of the monovinyl glycol ether after distillation was 96.8%.

[0109] Comparative Example 5

[0110] The method for preparing a high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that:

[0111] In the mixed system, palladium chloride with a total Pd content of 2 g / L and AuCl3 with a Group IB metal content of 4 g / L were used as catalysts.

[0112] The monovinyl glycol ether content in the collected liquid was 38.5%, and the purity of the monovinyl glycol ether after distillation was 89.5%.

[0113] Comparative Example 6

[0114] The method for preparing a high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that:

[0115] In the mixed system, palladium chloride with a total Pd content of 13 g / L and AuCl3 with a Group IB metal content of 4 g / L were used as catalysts.

[0116] The collected liquid contained 81% monovinyl glycol ether, and the purity of the monovinyl glycol ether after distillation was 93.5%.

[0117] Comparative Example 7

[0118] The method for preparing a high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that:

[0119] The catalyst consists only of AuCl3 with a group IB metal content of 10 g / L.

[0120] The monovinyl glycol ether content in the collected liquid was 46.5%, and the purity of the monovinyl glycol ether after distillation was 87.8%.

[0121] Comparative Example 8

[0122] The method for preparing a high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that:

[0123] The catalyst consists only of palladium chloride with a total Pd content of 15 g / L.

[0124] The collected liquid contained 82% monovinyl ethylene glycol ether, and the purity of the monovinyl ethylene glycol ether after distillation was 92.5%.

[0125] Comparative Example 9

[0126] The method for preparing a high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that:

[0127] The reaction temperature was adjusted to 170℃.

[0128] The collected liquid contained 38% monovinyl glycol ether, and the purity of the monovinyl glycol ether after distillation was 85%.

[0129] Comparative Example 10

[0130] The method for preparing a high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that:

[0131] The reaction pressure was adjusted to 0.25 MPa.

[0132] The collected liquid contained 48% monovinyl glycol ether, and the purity of the monovinyl glycol ether after distillation was 89%.

[0133] Comparative Example 11

[0134] The method for preparing a high-purity monovinyl alcohol ether provided in this comparative example differs from that in Example 2 only in that:

[0135] Vacuum dehydration treatment was not performed.

[0136] The collected liquid contained 85% monovinyl glycol ether, and the purity of the monovinyl glycol ether after distillation was 92%.

[0137] Therefore, as can be seen from the embodiments and comparative examples of the present invention, the monovinyl alcohol ether prepared by the method of the present invention has high conversion rate and high purity.

[0138] All aspects, embodiments, features, and examples of this invention are to be regarded as illustrative in all respects and are not intended to limit the invention, the scope of which is defined only by the claims. Other embodiments, modifications, and uses will become apparent to those skilled in the art without departing from the spirit and scope of the invention as claimed.

[0139] In addition, the inventors of this case also conducted experiments with other raw materials, process operations, and process conditions described in this specification, referring to the aforementioned embodiments, and obtained relatively ideal results in all cases.

[0140] Although the invention has been described with reference to illustrative embodiments, those skilled in the art will understand that various other changes, omissions, and / or additions can be made without departing from the spirit and scope of the invention, and that elements of the described embodiments can be substituted with substantially equivalents. Furthermore, many modifications can be made without departing from the scope of the invention to adapt particular situations or materials to the teachings of the invention. Therefore, this invention is not intended to be limited to the specific embodiments disclosed for carrying out the invention, but rather is intended to encompass all embodiments falling within the scope of the appended claims.

Claims

1. A method for preparing high-purity monovinyl alcohol ether, characterized in that, include: A mixture containing a catalyst and a diol is subjected to vacuum dehydration, followed by the introduction of ethylene and oxygen to react and produce a high-purity monovinyl alcohol ether. The catalyst comprises palladium chloride and a Group IB metal chloride.

2. The preparation method according to claim 1, characterized in that: The total Pd content in the mixed system is 3-12 g / L, preferably 5-10 g / L; And / or, the content of Group IB metals in the mixed system is 1-5 g / L, preferably 2-4 g / L; And / or, the Group IB metal chloride contains at least one of the Group IB metal elements selected from Ag, Au, and Cu; Preferably, the group IB metal chloride includes at least one of AgCl, AuCl3, and CuCl2, with AgCl or AuCl3 being particularly preferred.

3. The preparation method according to claim 1, characterized in that, Specifically, it includes: The catalyst containing palladium chloride and Group IB metal chloride is dissolved in a diol to form the mixed system. The system is then evacuated, heated to a specified temperature, and subjected to vacuum dehydration.

4. The preparation method according to claim 3, characterized in that: The mass ratio of the diol to the catalyst is 50–81:1; And / or, the diol includes at least one of ethylene glycol, diethylene glycol, and 1,4-butanediol; And / or, the vacuum degree used in the vacuum dehydration process is -0.01 to -0.10 MPa; And / or, raise the temperature to the specified temperature at a rate of 1 to 5 °C / min; And / or, the specified temperature is 120–150°C, preferably 130–140°C; And / or, the vacuum dehydration treatment time is 10 to 30 minutes; And / or, the water content of the mixed system after vacuum dehydration is less than 10 ppm.

5. The preparation method according to claim 3, characterized in that, Specifically, it includes: Ethylene and oxygen are continuously introduced into a vacuum-dehydrated mixture to carry out the reaction. Diol is continuously added during the reaction while maintaining a constant reaction pressure to obtain the high-purity monovinyl alcohol ether.

6. The preparation method according to claim 5, characterized in that: The molar ratio of the total amount of oxygen, ethylene and diol is 1:(2-3):(1.8-2.2), preferably 1:(2.2-2.8):(1.9-2.1); And / or, the temperature of the reaction is consistent with the specified temperature; And / or, the reaction pressure is 0.3 to 0.6 MPa, preferably 0.4 to 0.5 MPa; And / or, the volumetric flow rate of the ethylene is 1200–3200 hr. -1 Preferably 1600-2800hr -1 ; And / or, the volumetric flow rate of the oxygen is 600–1600 hr. -1 Preferably 800-1400hr -1 .

7. The preparation method according to claim 1, characterized in that: The conversion rate of the high-purity monovinyl alcohol ether is 66-96%.

8. High-purity monovinyl alcohol ether prepared by any one of claims 1-7.

9. The high-purity monovinyl alcohol ether according to claim 8, characterized in that: The purity of the high-purity monovinyl alcohol ether is ≥99.5%.

10. The application of the high-purity monovinyl alcohol ether according to claim 8 or 9 in the field of polyether synthesis.

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