A process for the preparation of dicumyl peroxide

Abstract

The application provides a preparation method of dicumyl peroxide. The preparation method is a condensation reaction of cumene hydroperoxide and alpha,alpha-dimethyl benzyl alcohol under the condition of an inhibitor and an acidic catalyst, and vacuum dehydration is simultaneously performed in the condensation reaction process. The combined inhibitor can greatly inhibit the decomposition of cumene peroxide and dicumyl peroxide, and finally realizes high conversion rate of raw materials, high selectivity of products and intrinsic safety of the reaction process. The conversion rate of cumene hydroperoxide is more than 99.5%, and the selectivity of dicumyl peroxide is more than 98%.

Description

Technical Field

[0001] This invention belongs to the field of organic synthesis technology, specifically relating to a method for preparing dicumyl peroxide. Background Technology

[0002] Dicumyl peroxide (DCP) is a commonly used symmetrical dialkyl organic peroxide, also known as a vulcanizing agent. It is a white crystalline solid with a melting point of 39℃–40℃ and a decomposition temperature of 120℃–125℃. It is stable at room temperature, gradually turning slightly yellow upon exposure to light, and has a theoretical active oxygen content of 5.92%. DCP can be used as a vulcanizing agent for natural and synthetic rubbers, such as EPDM, nitrile rubber, and silicone rubber. It can also be used as an initiator for polymerization reactions and as a crosslinking agent for polyethylene resins, such as polyethylene (PE), chlorinated polyethylene (CPE), and polystyrene (PS). DCP is also used as an initiator for the synthesis of expandable polystyrene (EPS) and a foaming agent for polyethylene vinyl acetate (EVA). After crosslinking, DCP significantly improves the physical properties of the polymer, increasing its heat resistance, chemical resistance, pressure resistance, crack resistance, and mechanical strength. DCP is widely used in industries such as wire and cable, footwear, and building materials. In recent years, with the continuous expansion of the polymer materials market, the demand for DCP has been increasing year by year, and the market potential is huge.

[0003] Currently, the industrial production of dicumyl peroxide (DCP) employs a batch reactor process. This process uses cumyl peroxide as raw material, oxidizing it to cumyl hydroperoxide (CHP) via air oxidation. A portion of the CHP is then reduced to α,α-dimethylbenzyl alcohol (DMBA). Subsequently, CHP and α,α-dimethylbenzyl alcohol undergo a condensation reaction under an acidic catalyst to produce DCP. Following alkaline washing, water washing, and crystallization, the final product is obtained. The condensation reaction process is as follows:

[0004] Main reaction:

[0005]

[0006] Side reactions:

[0007]

[0008] The reaction process reveals that the main reaction is a dehydration chemical equilibrium process. During the condensation reaction, the main side reactions include the dehydration of DMBA to produce α-methylstyrene (AMS), the acid-catalyzed decomposition of CHP to produce phenol and acetone, the acid-catalyzed decomposition of DCP to produce phenol, acetone, and DMBA, followed by further acid-catalyzed dehydration of DMBA to produce AMS. The byproduct phenol and AMS undergo alkylation to produce 4-cumylphenol, and AMS itself polymerizes to form dimers and trimers. All of these decomposition, alkylation, and polymerization reactions are strongly exothermic; if the reactions get out of control, they will cause an explosion.

[0009] Therefore, the condensation process has the following technical problems: (1) The main reaction is an acid-catalyzed reaction, but CHP and DCP are prone to secondary decomposition under acid catalysis; (2) The main reaction is an equilibrium reaction, and the water generated in the system needs to be removed in time; (3) The reaction endpoint is difficult to control, the raw materials are not fully reacted, which affects the product quality, and the over-reaction leads to the secondary decomposition of DCP.

[0010] US4266081A discloses a method for preparing dicumyl peroxide using a strong acid-weak base salt (such as zinc chloride) as a catalyst. This patent has problems such as easy hydrolysis of the catalyst, strong corrosiveness, and large dosage.

[0011] US4413148A discloses a method for preparing dicumyl peroxide. This patent uses polar solvents such as triethyl phosphate, which are almost not distilled away by water during the continuous removal of water generated in the reaction, to achieve the purpose of inhibiting the decomposition of CHP and DCP. However, it still has the problem of low DCP selectivity. In particular, when the CHP conversion rate reaches more than 90%, the DCP selectivity is only about 90%. At the same time, there is the problem of adding a large amount of high-boiling-point polar solvent.

[0012] CN103145597B and CN104860861A disclose a method for producing dicumyl peroxide, which relates to a method for reducing byproducts during the dicumyl peroxide condensation reaction. This patent employs a batch production process with a DCP selectivity of less than 94%, still exhibiting the problem of low DCP selectivity in the condensation reaction.

[0013] CN102827051A relates to a method for synthesizing dicumyl peroxide, disclosing a method for synthesizing dicumyl peroxide using benzyl alcohol and an oxidizing liquid as raw materials. Although this patent has reduced the content of byproducts such as phenol and acetone, the content of byproducts such as phenol and acetone is still as high as 3.5-4.2%, resulting in low DCP product yield and high byproduct content.

[0014] CN117690069A relates to a reaction method and apparatus for dicumyl peroxide (DCP). This patent involves circulating the reaction liquid between a reaction vessel and a thin-film reactor, with water generated during the reaction being removed by a vacuum system connected to both the reaction vessel and the thin-film reactor. However, this patent suffers from a narrow reaction temperature control range, poor DCP product selectivity, and high byproduct content.

[0015] In summary, the current industrial-scale condensation process for producing dicumyl peroxide suffers from problems such as high catalyst consumption, poor product selectivity, poor process controllability, low safety factor, and / or low production efficiency. Summary of the Invention

[0016] In view of the shortcomings of the existing technology, one of the objectives of this invention is to provide a method for preparing dicumyl peroxide, which can achieve both high conversion rate of raw materials and high selectivity of products, and the reaction process is safe.

[0017] To achieve its objective, the present invention provides the following technical solution:

[0018] A method for preparing dicumyl peroxide, wherein dicumyl peroxide and α,α-dimethylbenzyl alcohol undergo a condensation reaction under the conditions of an inhibitor and an acidic catalyst, and vacuum dehydration is carried out simultaneously during the condensation reaction.

[0019] The main reaction of this invention is a chemical equilibrium process. As the condensation reaction proceeds, the amount of water produced gradually accumulates, and the concentration of acid catalyst in the reaction system gradually decreases, thus slowing down the reaction rate. This invention removes the water produced during the condensation reaction in a timely manner under vacuum, ensuring a sufficient concentration of acid catalyst to achieve the catalytic purpose. The reaction temperature control for the preparation of DCP by the condensation reaction of CHP and DMBA is extremely stringent. CHP and DCP are highly susceptible to secondary decomposition under the action of acidic catalysts, especially towards the end of the reaction when the conversion rate of CHP exceeds 95%, at which point DCP is prone to secondary decomposition, leading to overheating, overpressure, or even explosion accidents.

[0020] The inventors discovered that the synergistic effect of two inhibitors, organic polyphosphonic acids and imidazole compounds, terminated the free radical ROO. · Decomposition and free radical C6H5(CH3)2CO ·The decomposition of CHP is particularly pronounced towards the end of the reaction. Under high CHP conversion and in the presence of an acidic catalyst, DCP remains largely undecomposed, ultimately achieving high feed conversion, high product selectivity, and inherent safety of the reaction process. Specifically, the conversion rate of cumene hydroperoxide is over 99.5%, and the selectivity of dicumene peroxide is over 98%. Furthermore, due to the minimal decomposition of CHP and DCP under the action of the combined inhibitors, the selection range for feed concentrations is wide, the reaction temperature has high operational flexibility, and it is easy to control, facilitating large-scale industrial production.

[0021] In one embodiment of the present invention, the inhibitor is a composition of an organic polyphosphonic acid and an imidazole compound; preferably, the organic polyphosphonic acid is selected from methylene and / or ethylphosphonic acid, more preferably one or more of aminotrimethylenephosphonic acid, hydroxyethylidene diphosphonic acid, ethylenediaminetetramethylenephosphonic acid, and diethylenetriaminepentamethylenephosphonic acid, more preferably aminotrimethylenephosphonic acid and / or hydroxyethylidene diphosphonic acid; preferably, the imidazole compound is selected from imidazole and its derivatives, more preferably one or more of imidazole, methylimidazolium, 2-mercaptoimidazolium, and 2-mercaptobenzimidazole, more preferably imidazole and / or methylimidazolium; preferably, the mass ratio of the organic polyphosphonic acid to the imidazole compound in the inhibitor is 1:1-1:20, preferably 1:4-1:16, more preferably 1:8-1:12; preferably, based on the total mass of the cumene hydroperoxide, the amount of the combined inhibitor is 50-300 ppm, preferably 100-200 ppm, more preferably 120-160 ppm.

[0022] In one embodiment of the present invention, the acidic catalyst is selected from inorganic acids and / or organic acids, preferably one or more of sulfuric acid, hydrochloric acid, phosphoric acid, perchloric acid, p-toluenesulfonic acid, dodecylbenzenesulfonic acid, and trichloroacetic acid, more preferably one or more of sulfuric acid, perchloric acid, p-toluenesulfonic acid, and dodecylbenzenesulfonic acid; preferably, the amount of the acidic catalyst is 10-200 ppm, more preferably 50-150 ppm, more preferably 80-120 ppm, based on the total mass of cumene hydroperoxide. Preferably, the acidic catalyst is prepared as an aqueous solution, preferably with a mass concentration of 10-50 wt%, more preferably 20-40 wt%.

[0023] In one embodiment of the present invention, the molar ratio of cumene hydroperoxide and α,α-dimethylbenzyl alcohol in the condensation reaction is (0.8-1.5):1, preferably (0.9-1.2):1, and more preferably (1.0-1.1):1.

[0024] In one embodiment of the present invention, cumene hydroperoxide is added to the reaction system in solution form during the condensation reaction; preferably, the mass concentration of the cumene hydroperoxide solution is 24-88 wt%, more preferably 35-70 wt%, and more preferably 50-60 wt%.

[0025] In one embodiment of the present invention, the reaction temperature of the condensation reaction is 30-70°C, preferably 40-60°C, and more preferably 45-55°C.

[0026] In one embodiment of the present invention, the vacuum degree of the condensation reaction is 2-20 kPa, preferably 4-16 kPa, and more preferably 8-12 kPa.

[0027] In one embodiment of the present invention, the reaction time of the condensation reaction is 1-6 hours, preferably 2-5 hours, and more preferably 3-4 hours.

[0028] Another object of the present invention is to provide dicumyl peroxide.

[0029] A dicumyl peroxide, wherein the dicumyl peroxide is prepared by the above-described preparation method.

[0030] The technical solution provided by this invention has the following beneficial effects:

[0031] In this invention, the conversion rate of cumene hydroperoxide is over 99.5%, and the selectivity of dicumene hydroperoxide is over 98%. Furthermore, this invention offers a wide range of raw material concentrations, high operational flexibility in reaction temperature, and ease of control, which is beneficial for large-scale industrial production. Detailed Implementation

[0032] To facilitate understanding of the present invention, the following description, in conjunction with embodiments, will further illustrate the invention. It should be understood that the following embodiments are merely for a better understanding of the invention and do not imply that the invention is limited to these embodiments.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The term "and / or" may be used herein to include any and all combinations of one or more of the associated listed items.

[0034] The present invention will be further illustrated by specific embodiments below, but it should not be construed as the present invention being limited thereto.

[0035] Where specific experimental steps or conditions are not specified in the examples, the corresponding conventional experimental steps or conditions in this technical field can be followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0036] Cumene peroxide solution: Wanhua Chemical Group Co., Ltd., mass concentration 24-88wt%;

[0037] α,α-Dimethylbenzyl alcohol: Aladdin Reagent (Shanghai) Co., Ltd., purity ≥99.0%.

[0038] The reaction conversion rate and selectivity were determined using the external standard curve method of liquid chromatography.

[0039] The chromatographic analysis conditions were as follows: Shimadzu SPD-20A liquid chromatograph; column oven: CT0-10ASvp; column temperature: 35℃; column: T3 column; mobile phase: water and acetonitrile, water / acetonitrile = 25:75 (vol / vol); total flow rate: 1 ml / min; residence time: 40 min; detector wavelength: 254 nm.

[0040] All ppm values ​​are mass ppm.

[0041] Example 1

[0042] Under stirring conditions, 99.9% pure α,α-dimethylbenzyl alcohol, 50 wt% cumene hydroperoxide solution (solvent: cumene), a combination inhibitor of aminotrimethylphosphonic acid and imidazole, and 25 wt% p-toluenesulfonic acid aqueous solution were added sequentially to a 1 L autoclave. The reaction was carried out at 45 °C and a vacuum of 8 kPa for 2 h. Liquid chromatography analysis showed that the conversion rate of cumene hydroperoxide was 100%, and the selectivity of cumene hydroperoxide was 99.6%. The molar ratio of cumene hydroperoxide to α,α-dimethylbenzyl alcohol was 1:1. Based on the total mass of cumene hydroperoxide, the amount of p-toluenesulfonic acid was 80 ppm, and the amount of the combination inhibitor of aminotrimethylphosphonic acid and imidazole was 120 ppm, with a mass ratio of aminotrimethylphosphonic acid to imidazole of 1:8.

[0043] Example 2

[0044] Under stirring conditions, 99.9% pure α,α-dimethylbenzyl alcohol, 60 wt% cumene hydroperoxide solution (solvent: cumene), a combination inhibitor of hydroxyethylidene diphosphonic acid and imidazole, and 30 wt% aqueous solution of dodecylbenzenesulfonic acid were added sequentially to a 1 L autoclave. The reaction was carried out at 55 °C and a vacuum of 12 kPa for 5 h. Liquid chromatography analysis showed that the conversion rate of cumene hydroperoxide was 100%, and the selectivity of cumene hydroperoxide was 99.5%. The molar ratio of cumene hydroperoxide to α,α-dimethylbenzyl alcohol was 1.1:1. Based on the total mass of cumene hydroperoxide, the amount of dodecylbenzenesulfonic acid was 120 ppm, and the amount of the combination inhibitor of hydroxyethylidene diphosphonic acid and imidazole was 160 ppm, with a mass ratio of hydroxyethylidene diphosphonic acid to imidazole of 1:12.

[0045] Example 3

[0046] Under stirring conditions, 99.9% pure α,α-dimethylbenzyl alcohol, 35 wt% cumene hydroperoxide solution (solvent: cumene), a combination inhibitor of aminotrimethylphosphonic acid and imidazole, and 50 wt% aqueous solution of dodecylbenzenesulfonic acid were added sequentially to a 1 L autoclave. The reaction was carried out at 40 °C and 4 kPa for 3 h. Liquid chromatography analysis showed that the conversion rate of cumene hydroperoxide was 99.8%, and the selectivity of cumene hydroperoxide was 99.0%. The molar ratio of cumene hydroperoxide to α,α-dimethylbenzyl alcohol was 0.9:1. Based on the total mass of cumene hydroperoxide, the amount of sulfuric acid used was 150 ppm, and the amount of the combination inhibitor of aminotrimethylphosphonic acid and imidazole was 200 ppm, with a mass ratio of aminotrimethylphosphonic acid to imidazole of 1:4.

[0047] Example 4

[0048] Under stirring conditions, 99.9% pure α,α-dimethylbenzyl alcohol, 70 wt% cumene hydroperoxide solution (solvent: cumene), a combination inhibitor of hydroxyethylidene diphosphonic acid and methyl thioimidazole, and 10 wt% perchloric acid aqueous solution were added sequentially to a 1 L autoclave. The reaction was carried out at 60 °C and a vacuum of 16 kPa for 4 h. Liquid chromatography analysis showed that the conversion rate of cumene hydroperoxide was 99.7%, and the selectivity of cumene hydroperoxide was 99.3%. The molar ratio of cumene hydroperoxide to α,α-dimethylbenzyl alcohol was 1.2:1. Based on the total mass of cumene hydroperoxide, the amount of perchloric acid was 200 ppm, and the amount of the combination inhibitor of hydroxyethylidene diphosphonic acid and methyl thioimidazole was 100 ppm, with a mass ratio of hydroxyethylidene diphosphonic acid to methyl thioimidazole of 1:16.

[0049] Example 5

[0050] Under stirring conditions, 99.9% pure α,α-dimethylbenzyl alcohol, 24 wt% cumene hydroperoxide solution (solvent: cumene), a combination inhibitor of aminotrimethylphosphonic acid and imidazole, and 40 wt% perchloric acid aqueous solution were added sequentially to a 1 L autoclave. The reaction was carried out at 70 °C and a vacuum of 20 kPa for 1 h. Liquid chromatography analysis showed that the conversion rate of cumene hydroperoxide was 99.8%, and the selectivity of cumene hydroperoxide was 98.1%. The molar ratio of cumene hydroperoxide to α,α-dimethylbenzyl alcohol was 1.5:1. Based on the total mass of cumene hydroperoxide, the amount of perchloric acid was 10 ppm, and the amount of the combination inhibitor of aminotrimethylphosphonic acid and imidazole was 50 ppm, with a mass ratio of aminotrimethylphosphonic acid to imidazole of 1:1.

[0051] Example 6

[0052] Under stirring conditions, 99.9% pure α,α-dimethylbenzyl alcohol, 88 wt% cumene hydroperoxide solution (solvent: cumene), a combination inhibitor of ethylenediaminetetramethylenephosphonic acid and imidazole, and 20 wt% p-toluenesulfonic acid aqueous solution were added sequentially to a 1 L autoclave. The reaction was carried out at 30 °C and a vacuum of 2 kPa for 6 h. Liquid chromatography analysis showed that the conversion rate of cumene hydroperoxide was 99.6%, and the selectivity of cumene hydroperoxide was 98.5%. The molar ratio of cumene hydroperoxide to α,α-dimethylbenzyl alcohol was 0.8:1. Based on the total mass of cumene hydroperoxide, the amount of p-toluenesulfonic acid was 50 ppm, and the amount of the combination inhibitor of ethylenediaminetetramethylenephosphonic acid and imidazole was 300 ppm, with a mass ratio of ethylenediaminetetramethylenephosphonic acid to imidazole of 1:20.

[0053] Example 7

[0054] Under stirring conditions, 99.9% pure α,α-dimethylbenzyl alcohol, 50 wt% cumene hydroperoxide solution (solvent: cumene), a combination inhibitor of aminotrimethylphosphonic acid and 2-mercaptoimidazole, and 25 wt% aqueous phosphoric acid were added sequentially to a 1 L autoclave. The reaction was carried out at 45 °C and a vacuum of 8 kPa for 2 h. Liquid chromatography analysis showed that the conversion rate of cumene hydroperoxide was 99.5%, and the selectivity of dicumene hydroperoxide was 98.1%. The molar ratio of cumene hydroperoxide to α,α-dimethylbenzyl alcohol was 1:1. Based on the total mass of cumene hydroperoxide, the amount of phosphoric acid was 80 ppm, and the amount of the combination inhibitor of aminotrimethylphosphonic acid and 2-mercaptoimidazole was 120 ppm, with a mass ratio of aminotrimethylphosphonic acid to 2-mercaptoimidazole of 1:8.

[0055] Example 8

[0056] Under stirring conditions, 99.9% pure α,α-dimethylbenzyl alcohol, 60 wt% cumene hydroperoxide solution (solvent: cumene), a combination inhibitor of ethylenediaminetetramethylenephosphonic acid and methyl thioimidazole, and 30 wt% aqueous solution of dodecylbenzenesulfonic acid were added sequentially to a 1 L autoclave. The reaction was carried out at 55 °C and 12 kPa for 5 h. Liquid chromatography analysis showed that the conversion rate of cumene hydroperoxide was 99.7%, and the selectivity of cumene hydroperoxide was 98.2%. The molar ratio of cumene hydroperoxide to α,α-dimethylbenzyl alcohol was 1.1:1. Based on the total mass of cumene hydroperoxide, the amount of dodecylbenzenesulfonic acid was 120 ppm, and the amount of the combination inhibitor of ethylenediaminetetramethylenephosphonic acid and methyl thioimidazole was 160 ppm, with a mass ratio of ethylenediaminetetramethylenephosphonic acid to methyl thioimidazole of 1:12.

[0057] Comparative Example 1

[0058] Compared to Example 1, aminotrimethylphosphonic acid was not added under the same conditions.

[0059] Liquid chromatography analysis showed that the conversion rate of dicumyl peroxide was 100% and the selectivity of dicumyl peroxide was 93.5%.

[0060] Comparative Example 2

[0061] Compared to Example 1, methimazole was not added under the same conditions.

[0062] Liquid chromatography analysis showed that the conversion rate of cumene hydroperoxide was 99.5%, and the selectivity of dicumene hydroperoxide was 89.6%.

[0063] Comparative Example 3

[0064] Compared to Example 1, under the same conditions, no aminotrimethylphosphonic acid and methimazole inhibitors were added.

[0065] Liquid chromatography analysis showed that the conversion rate of cumene hydroperoxide was 98.0% and the selectivity of dicumene hydroperoxide was 78.6%.

[0066] It is readily understood that the above embodiments are merely illustrative examples for clear explanation and do not imply that the invention is limited thereto. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing dicumyl peroxide, characterized in that, The preparation method involves the condensation reaction of cumene hydroperoxide and α,α-dimethylbenzyl alcohol under the conditions of inhibitor and acidic catalyst, with vacuum dehydration occurring simultaneously during the condensation reaction. The inhibitor is a combination of an organic polyphosphonic acid and an imidazole compound; wherein the organic polyphosphonic acid is selected from one or more of aminotrimethylenephosphonic acid, hydroxyethylidene diphosphonic acid, ethylenediaminetetramethylenephosphonic acid, and diethylenetriaminepentamethylenephosphonic acid, and the imidazole compound is selected from one or more of imidazole, methyl thioimidazole, 2-mercaptoimidazole, and 2-mercaptobenzimidazole; The acidic catalyst is selected from inorganic acids and / or organic acids.

2. The preparation method according to claim 1, characterized in that, The organic polyphosphonic acid is selected from aminotrimethylenephosphonic acid and / or hydroxyethylidene diphosphonic acid; The imidazole compound is selected from imidazole and / or methimazole; The mass ratio of the organic polyphosphonic acid and the imidazole compound in the inhibitor is 1:1 to 1:20; Based on the total mass of the cumene hydroperoxide, the dosage of the combined inhibitor is 50-300 ppm.

3. The preparation method according to claim 2, characterized in that, The mass ratio of the organic polyphosphonic acid and the imidazole compound in the inhibitor is 1:4-1:16; Based on the total mass of the cumene hydroperoxide, the dosage of the combined inhibitor is 100-200 ppm.

4. The preparation method according to claim 3, characterized in that, The mass ratio of the organic polyphosphonic acid and the imidazole compound in the inhibitor is 1:8-1:12; Based on the total mass of the cumene hydroperoxide, the dosage of the combined inhibitor is 120-160 ppm.

5. The preparation method according to claim 1 or 2, characterized in that, The acidic catalyst is selected from one or more of sulfuric acid, hydrochloric acid, phosphoric acid, perchloric acid, p-toluenesulfonic acid, dodecylbenzenesulfonic acid, and trichloroacetic acid.

6. The preparation method according to claim 5, characterized in that, The acidic catalyst is selected from one or more of sulfuric acid, perchloric acid, p-toluenesulfonic acid, and dodecylbenzenesulfonic acid; The amount of the acidic catalyst is 10-200 ppm, based on the total mass of cumene hydroperoxide.

7. The preparation method according to claim 6, characterized in that, The amount of the acidic catalyst is 50-150 ppm, based on the total mass of cumene hydroperoxide.

8. The preparation method according to claim 7, characterized in that, The amount of the acidic catalyst is 80-120 ppm, based on the total mass of cumene hydroperoxide.

9. The preparation method according to claim 1, characterized in that, In the condensation reaction, the molar ratio of cumene hydroperoxide and α,α-dimethylbenzyl alcohol is (0.8-1.5):1; And / or, in the condensation reaction, cumene hydroperoxide is added to the reaction system in solution form; And / or, the reaction temperature for the condensation reaction is 30-70℃; And / or, the vacuum degree of the condensation reaction is 2-20 kPa; And / or, the reaction time of the condensation reaction is 1-6 hours.

10. The preparation method according to claim 9, characterized in that, In the condensation reaction, the molar ratio of cumene hydroperoxide and α,α-dimethylbenzyl alcohol is (0.9-1.2):1; The mass concentration of the cumene hydrogen peroxide solution is 24-88 wt%. And / or, the reaction temperature for the condensation reaction is 40-60℃; And / or, the vacuum degree of the condensation reaction is 4-16 kPa; And / or, the reaction time of the condensation reaction is 2-5 hours.

11. The preparation method according to claim 10, characterized in that, In the condensation reaction, the molar ratio of cumene hydroperoxide and α,α-dimethylbenzyl alcohol is (1.0-1.1):1; The mass concentration of the cumene hydrogen peroxide solution is 35-70 wt%. And / or, the reaction temperature for the condensation reaction is 45-55℃; And / or, the vacuum degree of the condensation reaction is 8-12 kPa; And / or, the reaction time of the condensation reaction is 3-4 hours.

12. The preparation method according to claim 11, characterized in that, The mass concentration of the cumene hydrogen peroxide solution in the condensation reaction is 50-60 wt%.

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