Working carrier and working solution for producing hydrogen peroxide by anthraquinone method and method for producing hydrogen peroxide

Abstract

The invention relates to a working carrier and a working solution for producing hydrogen peroxide by an anthraquinone process. The working carrier contains 2, 7-substituted dialkyl anthraquinone; in the working solution, a working carrier comprises 2, 7-substituted dialkyl anthraquinone, and a solvent is trioctyl phosphate and diisobutyl carbinol and / or tetrabutyl urea and does not contain heavy aromatics. According to the working solution, the oxidation efficiency can be improved while the hydrogen efficiency is high, so that the size of an oxidation device can be reduced, and the overall equipment investment in hydrogen peroxide production is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of chemical synthesis. Further, the present invention relates to a working carrier, a working solution and a production method for producing hydrogen peroxide by the anthraquinone method. Background Art

[0002] The anthraquinone method for producing hydrogen peroxide is the most mature production method in industry, and more than 98% of the hydrogen peroxide production capacity uses this method. The method of using 2-alkyl anthraquinone as a hydrogen carrier for recycling to produce hydrogen peroxide began in the early 20th century and has been improved many times to make this method increasingly mature. In this method, a working solution is prepared by mixing 2-alkyl anthraquinone with an organic solvent. Under the conditions of a pressure of 0 to 3.0 MPa, a temperature of 55 to 65 °C, and in the presence of a catalyst, the working solution is hydrogenated with H2, and then countercurrently oxidized with air or oxygen at 40 to 44 °C. After extraction, regeneration, refining and concentration, an aqueous hydrogen peroxide solution product is obtained.

[0003] The working solution is the core of the cyclic production of hydrogen peroxide by the anthraquinone method and usually consists of two parts. One is a mixture of alkyl anthraquinone and its tetrahydro derivatives as the working (reaction) carrier; the other is a solvent that can dissolve both alkyl anthraquinone and alkyl anthrahydroquinone, or a solvent mixture composed of a non-polar solvent that can dissolve alkyl anthraquinone and a polar solvent that can dissolve alkyl anthrahydroquinone in a certain proportion. The non-polar solvent uses heavy aromatic hydrocarbons (C9 - C 12 aromatic hydrocarbons, AR), and the polar solvent mainly uses trioctyl phosphate (TOP).

[0004] CN109911859B discloses a working solution for preparing hydrogen peroxide by the anthraquinone method. Its solvent system includes AR, trioctyl phosphate (TOP), and o-methylcyclohexyl acetate (2-MCA). This working solution uses 2-MCA to replace part of TOP, which can effectively improve the solubility of anthraquinone in the working solution, thereby improving the oxidation efficiency and hydrogenation efficiency.

[0005] Although the existing technologies for producing hydrogen peroxide by the anthraquinone method have made some improvements in improving the performance of the working solution and achieved certain effects, there are still the following problems: One of the problems is that the working solution inevitably contains a large amount of heavy aromatic hydrocarbons AR; heavy aromatic hydrocarbons belong to Class 3 flammable liquids, and their components are mainly C9 or C 10The fraction, namely the mixture of trimethylbenzene and tetramethylbenzene isomers, also contains a small amount of xylene, naphthalene and gum; the heavy aromatic hydrocarbon is a flammable liquid, which can burn when the surrounding environment reaches the combustion conditions (such as ignition source, combustion promoter, etc.) and is extremely prone to side reactions. When the equipment such as storage tanks or towers through which the material passes is at atmospheric pressure, there may be a risk of gas-phase combustion and explosion due to seal failure and air inhalation; The second problem is that the working carrier mainly uses ethyl anthraquinone. Ethyl anthraquinone has low solubility in organic solvents and is easy to degrade. Therefore, it is necessary to control the single-pass conversion rate and require clay and alkali treatment in each cycle, resulting in low device efficiency and high consumption; More importantly, the production mode of alternating acid and alkali is extremely prone to safety accidents.

[0006] CN104085859B discloses a working fluid solvent system for the production of H2O2 by the anthraquinone method, and its mass fraction composition is: AR (C9-C 10 ) 30%-80%, TOP 10%-40%, isooctyl acetate 10%-30%. The isooctyl acetate plays a leading role in this working fluid system. Isooctyl acetate has the characteristics of high solubility in 2-ethylanthraquinone and 2-ethyltetrahydroanthraquinone and high extraction distribution coefficient of H2O2. This working fluid solvent system includes a five-component mixed solvent system and a three-component mixed solvent system. In addition to the commonly used AR and TOP, the added solvents are isooctyl acetate, cyclohexyl acetate and cyclohexyl propionate.

[0007] CN116062702A and CN116062700A disclose working fluids with 2,6-disubstituted dialkylanthraquinone as the working carrier, tetrabutylurea or diisobutyl methanol as the solvent and without heavy aromatic hydrocarbons, as well as corresponding production methods of hydrogen peroxide. Although the working fluid has the advantages of high hydrogen efficiency, simple composition, easy preparation, no toxic and harmful heavy aromatic hydrocarbons, and elimination of the gas-phase combustion and explosion risk, the high hydrogen efficiency also brings difficulties to the subsequent oxidation process. In industry, the non-catalytic auto-oxidation method is adopted in the oxidation process. To completely oxidize hydroanthraquinone, the oxidation tower is generally designed as the largest reaction device in the whole process flow, with high equipment investment. And under the condition of high hydrogen efficiency, the oxidation time is long, the possibility of hydrogen peroxide decomposition increases, resulting in low hydrogen peroxide yield, and the residual oxidation liquid entering the subsequent process brings safety risks. Summary of the Invention

[0008] The inventor unexpectedly discovered during the research and exploration of the anthraquinone process for producing hydrogen peroxide that when a 2,7-disubstituted alkyl anthraquinone or a mixture of a 2,7-disubstituted alkyl anthraquinone and a 2,6-disubstituted alkyl anthraquinone is used as the working fluid carrier, not only can the solubility of the effective anthraquinone be increased, but also compared with the 2,6-disubstituted alkyl anthraquinone, the 2,7-disubstituted alkyl anthraquinone has a substitution position electronic effect different from that of the 2,6-disubstituted dialkyl, making the working fluid more easily oxidized, that is, reducing the oxidation time and increasing the oxidation efficiency while having a high hydrogen efficiency, thereby reducing the size of the oxidation device and lowering the overall equipment investment.

[0009] Therefore, one of the purposes of the present invention is to provide a working carrier in the working fluid for preparing hydrogen peroxide by the anthraquinone process different from the prior art, the second purpose is to provide a working fluid for preparing hydrogen peroxide by the anthraquinone process, and the third purpose is to provide a method for producing hydrogen peroxide that takes into account both high hydrogen efficiency and high oxidation efficiency.

[0010] To achieve the above-mentioned first purpose, the first aspect of the present invention provides a working carrier for producing hydrogen peroxide by the anthraquinone process, characterized in that the working carrier contains a 2,7-disubstituted alkyl anthraquinone.

[0011] To achieve the above-mentioned second purpose, the second aspect of the present invention provides a working fluid for producing hydrogen peroxide by the anthraquinone process, characterized in that the working carrier in the working fluid includes a 2,7-disubstituted alkyl anthraquinone, and a mixture of trioctyl phosphate (TOP) and diisobutyl carbinol (DIBC) and / or tetrabutylurea (TBU) without heavy aromatic hydrocarbons (AR) is used as the solvent.

[0012] To achieve the above-mentioned third purpose, the third aspect of the present invention provides a method for producing hydrogen peroxide, which is to obtain hydrogen peroxide by subjecting the working fluid for producing hydrogen peroxide by the anthraquinone process to a hydrogenation process, an oxidation process, and an extraction process, characterized in that the working fluid is the working fluid for producing hydrogen peroxide by the anthraquinone process provided in the second aspect of the present invention above.

[0013] The working carrier for producing hydrogen peroxide by the anthraquinone process provided by the present invention contains a 2,7-disubstituted alkyl anthraquinone with a substitution position electronic effect different from that of the 2,6-disubstituted alkyl anthraquinone, has a high solubility, and can be better applied to the production method of hydrogen peroxide; the working fluid formula with it as the working carrier not only has the advantages of eliminating the gas-phase combustion and explosion risk caused by the use of heavy aromatic hydrocarbons AR and the hydrogenation efficiency index can meet the requirements of hydrogen peroxide production, but more importantly, it is easily oxidized, that is, reducing the oxidation time and increasing the oxidation efficiency while having a high hydrogen efficiency, thereby reducing the size of the oxidation device, lowering the equipment investment, and reducing the low hydrogen peroxide yield caused by the long oxidation time and the increased possibility of hydrogen peroxide decomposition in the device and the safety risk brought by the residual oxidation liquid entering the subsequent process. Detailed Embodiments

[0014] A working carrier for producing hydrogen peroxide by the anthraquinone method provided by the present invention is characterized in that the working carrier contains 2,7-disubstituted alkyl anthraquinone.

[0015] The inventor found that when the mixture of alkyl anthraquinones in which 2,7-disubstituted alkyl anthraquinone participates is used as the working solution carrier, the solubility of effective anthraquinone can be increased, and due to the different substitution position electron effects brought about by the different substitution positions, the hydroanthraquinone generated after hydrogenation of 2,7-disubstituted alkyl anthraquinone is easier to be oxidized than that of 2,6-disubstituted alkyl anthraquinone.

[0016] The working carrier provided by the present invention can be 2,7-disubstituted alkyl anthraquinone or a mixture of 2,7-disubstituted alkyl anthraquinone and 2,6-disubstituted alkyl anthraquinone.

[0017] The 2,7-disubstituted alkyl anthraquinone has the structural formula as shown in (1), and the 2,6-disubstituted alkyl anthraquinone has the structural formula as shown in (2):

[0018]

[0019] In the structural formula (1) or (2), R1 and R2 are each independently selected from C1-C8 normal / isoalkyl substitution groups. Preferably, the R1 and R2 are each independently selected from C2-C5 normal / isoalkyl substitution groups. R1 in the structural formula (1) and R1 in the structural formula (2) may be the same or different, and R2 in the structural formula (1) and R2 in the structural formula (2) may be the same or different. The normal / isoalkyl substitution groups include, but are not limited to, ethyl, n-propyl, isopropyl, n-butyl, 1-methylpropyl, 2-methylpropyl, tert-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, tert-pentyl, 2,2-dimethylpropyl, 1,2-dimethylpropyl or 1-ethylpropyl.

[0020] Specifically, the 2,7-disubstituted alkyl anthraquinone includes, but is not limited to, one or more of 2,7-di-tert-pentyl anthraquinone, 2-tert-pentyl-7-tert-butyl anthraquinone, 2,7-di-tert-butyl anthraquinone, 2,7-dipropyl anthraquinone, 2,7-diisopropyl anthraquinone, 2,7-diethyl anthraquinone.

[0021] Specifically, the 2,6-disubstituted alkyl anthraquinone includes, but is not limited to, one or more of 2,6-di-tert-pentyl anthraquinone, 2-tert-pentyl-6-tert-butyl anthraquinone, 2,6-di-tert-butyl anthraquinone, 2,6-dipropyl anthraquinone, 2,6-diisopropyl anthraquinone, 2,6-diethyl anthraquinone.

[0022] When the working carrier is a mixture of 2,7-disubstituted alkyl anthraquinone and 2,6-disubstituted alkyl anthraquinone, it can not only effectively improve the solubility, but also reduce the concentration of a single anthraquinone in the working solution, which means that the chemical equilibrium is not easy to generate degradation products, and the single-pass conversion rate of each anthraquinone can be further improved during the reaction process. When the working carrier is a mixture of 2,7-disubstituted alkyl anthraquinone and 2,6-disubstituted alkyl anthraquinone, by weight content, the 2,7-disubstituted alkyl anthraquinone and the 2,6-disubstituted alkyl anthraquinone are mixed in any ratio. Preferably, the 2,7-disubstituted alkyl anthraquinone ≥ 50%.

[0023] Preferably, a single 2,7-disubstituted alkyl anthraquinone is used as the working carrier, such as 2,7-di-tert-amyl anthraquinone, 2,7-di-tert-butyl anthraquinone, 2,7-dipropyl anthraquinone, 2,7-diisopropyl anthraquinone, 2,7-diethyl anthraquinone. Among them, 2,7-di-tert-amyl anthraquinone, 2,7-di-tert-butyl anthraquinone, and 2,7-dipropyl anthraquinone are more preferred single working carriers.

[0024] The disubstituted alkyl anthraquinone used as the working carrier can be obtained by rectification after obtaining 2-alkyl anthraquinone by the method disclosed in CN111825511B.

[0025] The present invention also provides a working solution for producing hydrogen peroxide by the anthraquinone method, which is characterized in that the working solution uses 2,7-disubstituted alkyl anthraquinone or a mixture of 2,7-disubstituted alkyl anthraquinone and 2,6-disubstituted alkyl anthraquinone as the working carrier, and a mixture of trioctyl phosphate (TOP) and diisobutyl carbinol (DIBC) and / or tetrabutylurea (TBU) without heavy aromatics (AR) as the solvent.

[0026] The working carrier in the working fluid undertakes all chemical reactions occurring in the production process, and the main function of the solvent is to dissolve and transport the working carrier. The properties of the solvent not only directly determine the production capacity of the device, but also have a greater impact on the efficiency of hydrogenation, oxidation, and extraction operation processes, as well as the degradation of effective anthraquinone. Considering the impact on the subsequent extraction process, relatively speaking, TOP and MAC have a larger density. To reduce the density, an appropriate amount of DIBC and TBU can be added, which can reduce the density of the entire working fluid. In the solvent described in the present invention, for the volume content of each component, preferably, the tributyl phosphate (TOP) is not higher than 50%, more preferably, the tributyl phosphate (TOP) is not higher than 40%, and most preferably, the tributyl phosphate (TOP) is 5 - 30%; the rest is diisobutyl carbinol (DIBC) and / or tetrabutylurea (TBU), and DIBC and TBU can be mixed in any proportion. Preferably, the ratio of DIBC to TBU is 1:1 - 1:0. The mixed solvent may also contain o-methyl cyclohexyl acetate (2-MCA). Among them, tributyl phosphate (TOP) and o-methyl cyclohexyl acetate (2-MCA) can be mixed in any proportion. By volume, the proportion of tributyl phosphate (TOP) and o-methyl cyclohexyl acetate (2-MCA) is not higher than 50%. The solvents described above can all be commercially available products.

[0027] Considering that the 2,7-position or 2,6-position disubstituted alkyl anthraquinone used is expensive, and a high concentration will affect the physical properties (viscosity, density, etc.) of the working fluid, causing difficulties in subsequent extraction, as well as considering factors such as comprehensive fixed asset investment and efficiency, the content of the working carrier in the working fluid provided by the present invention is 80 g / L - 300 g / L, and preferably, the content of the working carrier is 100 g / L - 200 g / L. The working fluid described in the present invention is prepared by using the preparation method of the working fluid in the prior art.

[0028] The present invention further provides a method for producing hydrogen peroxide, which is to obtain hydrogen peroxide by subjecting the working fluid for producing hydrogen peroxide by the anthraquinone method to a hydrogenation process, an oxidation process, and an extraction process. The characteristic is that the working fluid is the working fluid provided in the second aspect of the present invention above.

[0029] In the production method, hydrogenation is to hydrogenate the working carrier with H2 in the presence of a hydrogenation catalyst to generate the corresponding alkyl hydroanthraquinone and / or hydrogenated alkyl hydroanthraquinone, obtaining a hydrogenated liquid; oxidation is to contact the hydrogenated liquid with oxygen or air to generate hydrogen peroxide, and at the same time, the alkyl hydroanthraquinone and / or hydrogenated alkyl hydroanthraquinone are restored to alkyl anthraquinone and / or hydrogenated alkyl anthraquinone; extraction is to extract hydrogen peroxide from the oxidation liquid with water, and the raffinate is recycled back to the hydrogenation process after post-treatment.

[0030] The present invention will be further described below through examples, but the present invention is not limited thereby.

[0031] Examples 1 - 5

[0032] Working fluid preparation method: Add 2,6 - and 2,7 - disubstituted alkyl anthraquinones according to the feeding amounts shown in Table 1, and use the existing technology working fluid preparation method to prepare a working fluid with a certain alkyl anthraquinone concentration.

[0033] Working fluid hydrogenation efficiency measurement method: The working fluid hydrogenation reaction is carried out in a high - pressure reactor with a volume of 300 mL. The detailed process is as follows: Add 200 mL of the working fluid and a hydrogenation catalyst (a noble metal catalyst produced by Changling Catalyst Factory, grade PHA - 1) into the reactor. After sealing and pressure testing, replace the air in the reactor with hydrogen 6 times. After replacement, adjust the back - pressure valve to keep the hydrogen pressure in the reactor at 0.3 MPa, heat up to about 60 °C, open the inlet valve, start stirring and timing. After 30 minutes of reaction, take a certain amount of hydrogenated working fluid. Centrifuge the taken hydrogenated working fluid to remove the hydrogenation catalyst suspended in the hydrogenated working fluid. Accurately measure 2 mL of the centrifuged hydrogenated working fluid, analyze it using the potassium permanganate titration method, and calculate the hydrogenation efficiency using the volume of the consumed KMnO4 solution. The value of the hydrogenation efficiency (unit: g / L, that is, the number of grams of 100% H2O2 contained in each liter of the working fluid, equivalent to the production amount of alkyl anthrahydroquinone in each liter of the working fluid) can directly reflect the high or low activity of the catalyst. The hydrogenation efficiency can be calculated according to the following simplified formula:

[0034]

[0035] In the formula, C KMnO4 represents the potassium permanganate concentration, V KMnO4 represents the volume of the potassium permanganate solution, and V sample represents the volume of the working fluid.

[0036] Oxidation time measurement method: Centrifuge the hydrogenated working fluid taken in the hydrogenation step to remove the catalyst suspended in the hydrogenated working fluid. Take 2 mL of the centrifuged hydrogenated liquid into a 50 - mL separatory funnel (20 mL of deionized water and 2 mL of 2 mol / L H3PO4 solution have been added to the separatory funnel in advance), then place the separatory funnel in a 45 °C constant - temperature water bath, and introduce high - purity oxygen into it at an oxygen flow rate of 40 mL / min. Start the stopwatch to time until the color of the hydrogenated working fluid turns bright yellow. The time consumed in this process is the oxidation time.

[0037] The data of hydrogenation efficiency and oxidation time are shown in Table 1.

[0038] Comparative Examples 1 and 2

[0039] These Comparative Examples 1 and 2 illustrate the hydrogenation efficiency and oxidation time of the working fluid in the prior art using 2,6 - di - tert - amyl anthraquinone as the working carrier and diisobutyl carbinol (DIBC) and tetrabutylurea (TBU) as solvents respectively.

[0040] The hydrogenation efficiency and oxidation time data are shown in Table 1.

[0041] Comparative Example 3

[0042] This comparative example illustrates the hydrogenation efficiency of the working fluid using 2-ethylanthraquinone as the working carrier in the prior art. Since there is no heavy aromatic hydrocarbon as the solvent, the solubility of 2-ethylanthraquinone in the single solvent of diisobutyl carbinol (DIBC) is only 50 g / L at room temperature.

[0043] The hydrogenation efficiency data are shown in Table 1.

[0044] Comparative Example 4

[0045] This comparative example illustrates the hydrogenation efficiency of the working fluid using 2-ethylanthraquinone as the working carrier in the prior art. Since there is no heavy aromatic hydrocarbon as the solvent, the solubility of 2-ethylanthraquinone in the single solvent system of tetrabutylurea (TBU) is only 80 g / L at room temperature.

[0046] The hydrogenation efficiency data are shown in Table 1.

[0047] Table 1

[0048]

[0049]

[0050] As can be seen from Table 1, the working fluid with 2,7-disubstituted alkyl anthraquinone as the working carrier has the characteristics of high hydrogen efficiency and short oxidation time. In particular, the working fluid with 2,7-disubstituted alkyl anthraquinone alone as the working carrier has a shorter oxidation time on the premise of high hydrogen efficiency compared to the working fluid with a mixture of 2,6- and 2,7-disubstituted alkyl anthraquinones as the working carrier.

[0051] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0052] In addition, it should be noted that, in the case of no contradiction, the various specific technical features described in the above specific embodiments can be combined in any suitable way. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0053] In addition, any combination can be made between different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A working carrier for the production of hydrogen peroxide by the anthraquinone process, characterized in that, The working carrier contains 2,7-disubstituted alkyl anthraquinones.

2. The working carrier according to claim 1, wherein The working carrier is 2,7-disubstituted alkyl anthraquinone or a mixture of 2,7-disubstituted alkyl anthraquinone and 2,6-disubstituted alkyl anthraquinone.

3. The working carrier according to claim 2, characterized in that, The 2,7-disubstituted alkyl anthraquinone has the structural formula as shown in (1), and the 2,6-disubstituted alkyl anthraquinone has the structural formula as shown in (2); in the structural formula (1) or (2), R1 and R2 are C1-C8 normal / isoalkyl substitution groups, preferably C2-C5 normal / isoalkyl substitution groups.

4. The working carrier according to claim 3, characterized in that, The said normal / isoalkyl substitution groups are selected from ethyl, n-propyl, isopropyl, n-butyl, 1-methylpropyl, 2-methylpropyl, tert-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, tert-pentyl, 2,2-dimethylpropyl, 1,2-dimethylpropyl or 1-ethylpropyl.

5. The working carrier according to any one of claims 1 to 3, characterized in that, The 2,7-disubstituted alkyl anthraquinone is one or more of 2,7-di-tert-amyl anthraquinone, 2-tert-amyl-7-tert-butyl anthraquinone, 2,7-di-tert-butyl anthraquinone, 2,7-dipropyl anthraquinone, 2,7-diisopropyl anthraquinone, 2,7-diethyl anthraquinone.

6. The working carrier according to claim 2 or 3, characterized in that, The 2,6-disubstituted alkyl anthraquinone is one or more of 2,6-di-tert-amyl anthraquinone, 2-tert-amyl-6-tert-butyl anthraquinone, 2,6-di-tert-butyl anthraquinone, 2,6-dipropyl anthraquinone, 2,6-diisopropyl anthraquinone, 2,6-diethyl anthraquinone.

7. A working solution for the production of hydrogen peroxide by the anthraquinone process, characterized in that, The working carrier in the working fluid includes 2,7-disubstituted alkyl anthraquinone, and a mixture of trioctyl phosphate (TOP) and diisobutyl carbinol (DIBC) and / or tetrabutyl urea (TBU) without heavy aromatic hydrocarbons (AR) is used as the solvent.

8. The working fluid according to claim 7, wherein, The working fluid contains 2,7-disubstituted alkyl anthraquinone or a mixture of 2,7-disubstituted alkyl anthraquinone and 2,6-disubstituted alkyl anthraquinone as the working carrier.

9. The working fluid according to claim 7, wherein, The 2,7-disubstituted alkyl anthraquinone has the structural formula as shown in (1), and the 2,6-disubstituted alkyl anthraquinone has the structural formula as shown in (2): In the structural formula (1) or (2), R1 and R2 are C1-C8 normal / isoalkyl substitution groups, preferably C2-C5 normal / isoalkyl substitution groups.

10. The working fluid according to claim 9, characterized in that, The said normal / isoalkyl substitution groups are selected from ethyl, n-propyl, isopropyl, n-butyl, 1-methylpropyl, 2-methylpropyl, tert-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, tert-pentyl, 2,2-dimethylpropyl, 1,2-dimethylpropyl or 1-ethylpropyl.

11. The working fluid according to claim 7 or 8, characterized in that, The 2,7-disubstituted alkyl anthraquinone is one or more of 2,7-di-tert-amyl anthraquinone, 2-tert-amyl-7-tert-butyl anthraquinone, 2,7-di-tert-butyl anthraquinone, 2,7-dipropyl anthraquinone, 2,7-diisopropyl anthraquinone, 2,7-diethyl anthraquinone.

12. The working fluid according to claim 8, characterized in that, The 2,6-disubstituted alkyl anthraquinone is one or more of 2,6-di-tert-amyl anthraquinone, 2-tert-amyl-6-tert-butyl anthraquinone, 2,6-di-tert-butyl anthraquinone, 2,6-dipropyl anthraquinone, 2,6-diisopropyl anthraquinone, 2,6-diethyl anthraquinone.

13. The working fluid according to claim 8, characterized in that, In the mixture of the 2,7-disubstituted alkyl anthraquinone and the 2,6-disubstituted alkyl anthraquinone, the 2,7-disubstituted alkyl anthraquinone and the 2,6-disubstituted alkyl anthraquinone are mixed in any proportion by weight content. Preferably, the 2,7-disubstituted alkyl anthraquinone ≥ 50%.

14. The working fluid according to claim 7, wherein By volume, the proportion of trioctyl phosphate (TOP) in the solvent is not higher than 50%, preferably not higher than 40%.

15. The working fluid according to claim 7, characterized in that, By volume, the proportion of trioctyl phosphate (TOP) in the solvent is not higher than 50%, and diisobutyl carbinol (DIBC) and tetrabutylurea (TBU) are mixed in any proportion.

16. The working fluid according to any one of claims 7 and 14-15, characterized in that, The solvent also contains 2-methylcyclohexyl acetate (2-MAC).

17. The working fluid according to claim 16, characterized in that, By volume, trioctyl phosphate (TOP) and 2-methylcyclohexyl acetate (2-MCA) in the solvent are mixed in any proportion. Preferably, the proportion of trioctyl phosphate (TOP) and 2-methylcyclohexyl acetate (2-MCA) is not higher than 50%.

18. The working fluid according to claim 7, wherein, The content of the working carrier is 80 g / L to 300 g / L, preferably 100 g / L to 200 g / L.

19. A method for producing hydrogen peroxide, in which the working solution for producing hydrogen peroxide by the anthraquinone method is subjected to a hydrogenation process, an oxidation process, and an extraction process to obtain hydrogen peroxide, characterized in that, The working solution for producing hydrogen peroxide by the anthraquinone method is selected from the working solutions described in any one of claims 7-16.

20. The method according to claim 19, characterized in that, During the hydrogenation process, in the presence of a hydrogenation catalyst, the working carrier is hydrogenated with H2 to generate the corresponding alkyl hydroanthraquinone, and a hydrogenated solution is obtained; during the oxidation process, the hydrogenated solution is contacted with oxygen or air to generate hydrogen peroxide, and at the same time the alkyl hydroanthraquinone is restored to alkyl anthraquinone; during the extraction process, hydrogen peroxide is extracted from the oxidation solution with water, and the raffinate is recycled back to the hydrogenation process after vacuum dehydration.

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