Purified aqueous hydrogen peroxide solution and method for producing same

Abstract

Provided are: a method for producing a purified aqueous hydrogen peroxide solution; and an aqueous hydrogen peroxide solution having a low total carbon concentration and a low organic acid concentration (particularly acetic acid concentration). The production method comprises: a step in which a crude aqueous hydrogen peroxide solution having a total carbon concentration of 15-500 (mg-C / L) and an organic acid concentration of 12 (mg-C / L) or more is brought into contact with a solvent containing one or more substances selected from the group consisting of C8-9 polyhydric alcohols, C9monohydric alcohols, and C8-9 ketone group-containing compounds; a step for separating the solvent from the aqueous hydrogen peroxide solution; and a step for purifying the separated aqueous hydrogen peroxide solution using a reverse osmosis membrane.

Description

Technical Field

[0001] The present invention relates to a purified aqueous hydrogen peroxide solution and a method for producing the same. Background Art

[0002] Due to its oxidizing power and strong bleaching and bactericidal properties, hydrogen peroxide is used as a bleaching agent, bactericide, and food additive for paper, pulp, and fiber. Furthermore, its usage is increasing in the electronics industry, for applications such as cleaning the surfaces of semiconductor substrates, chemical polishing of copper, tin, and other copper alloys, and etching of electronic circuits. Hydrogen peroxide used in the electronics industry and as a food additive requires high purity, and the demand for high-purity hydrogen peroxide is increasing. The anthraquinone process is a common method for producing hydrogen peroxide. However, aqueous hydrogen peroxide solutions produced using such methods using organic solvents contain impurities such as organic matter from the organic solvents used and metals from the device materials. Therefore, to obtain high-purity aqueous hydrogen peroxide solutions, aqueous hydrogen peroxide solutions produced using the anthraquinone process are purified. Common methods for purifying aqueous hydrogen peroxide solutions include distillation, cyclone separators, adsorption resins, ion exchange resins, and reverse osmosis membranes (Patent Document 1).

[0003] High-purity aqueous hydrogen peroxide requires a low total carbon concentration. Purification using a reverse osmosis membrane (RO membrane) can significantly reduce (or prevent) the total carbon concentration in aqueous hydrogen peroxide, but it cannot reduce the amount of organic acids (particularly acetic acid) that pass through it. In other words, conventional techniques have the problem of being unable to purify aqueous hydrogen peroxide solutions containing large amounts of acetic acid.

[0004] Several techniques are commonly used to remove acetic acid. For example, there are removal techniques using activated carbon, removal techniques using ion exchange resins, and separation techniques using distillation. However, none of these existing acetic acid removal methods are effective for hydrogen peroxide (hydrogen peroxide). Activated carbon removes acetic acid by adsorbing it, but when activated carbon comes into contact with hydrogen peroxide, the hydrogen peroxide undergoes violent decomposition. Therefore, contact between hydrogen peroxide and activated carbon is not feasible. Ion exchange resins also remove acetic acid by exchanging acetate ions with their ion exchange groups. However, acetic acid is a weak acid with a low degree of dissociation, and the ratio of acetate ions to ions is low, making ion exchange with ion exchange resins difficult. Furthermore, because hydrogen peroxide is acidic, acetic acid dissociates more slowly than when water is used as the solvent. For this reason, using ion exchange resins to remove acetic acid from hydrogen peroxide is also ineffective. Furthermore, the boiling point difference between hydrogen peroxide and acetic acid is minimal, making separation by distillation cost-effective.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2000-302418 Summary of the Invention

[0008] Technical problem to be solved by the invention

[0009] The technical problem to be solved by the present invention is to provide an aqueous hydrogen peroxide solution having a low total carbon concentration and a low organic acid concentration (particularly a low acetic acid concentration) and a method for producing the same.

[0010] Technical solutions to technical problems

[0011] To solve the above-mentioned technical problems, the inventors of the present invention conducted intensive studies and, as a result, discovered that by combining a step of contacting a crude aqueous hydrogen peroxide solution with a specific solvent, followed by separation, and a purification step using a reverse osmosis membrane, the organic acid concentration (particularly the acetic acid concentration) can be reduced, thereby enabling the production of an aqueous hydrogen peroxide solution with a reduced total carbon concentration. This has led to the completion of the present invention.

[0012] That is, the present invention includes the following aspects.

[0013] <1> A method for producing a purified aqueous hydrogen peroxide solution, comprising:

[0014] A step of contacting a crude aqueous hydrogen peroxide solution having a total carbon concentration of 15 to 500 (mg-C / L) and an organic acid concentration of 12 (mg-C / L) or more with a solvent containing one or more selected from a polyol having 8 to 9 carbon atoms, a monool having 9 carbon atoms, and a compound having 8 to 9 carbon atoms and a ketone group;

[0015] a step of separating the solvent from the aqueous hydrogen peroxide solution; and

[0016] This is a process of purifying the separated aqueous hydrogen peroxide solution using a reverse osmosis membrane.

[0017] <2> The production method according to <1> above, wherein the organic acid concentration is an acetic acid concentration.

[0018] <3> The production method according to <1> or <2> above, wherein the solvent comprises at least one selected from diisobutylcarbinol, 1-nonanol, 2-ethyl-1,3-hexanediol, 2,4-diethyl-1,5-pentanediol, and diisobutyl ketone.

[0019] <4> The production method according to any one of <1> to <3> above, wherein in the contacting step, the solvent used is a mixed solvent containing 70% by volume or less of at least one solvent selected from an aromatic solvent and a hydrocarbon solvent having 5 to 10 carbon atoms.

[0020] <5> The production method according to <4> above, wherein the mixed solvent contains one or more selected from the group consisting of 1,2,4-trimethylbenzene, toluene, and heptane.

[0021] <6> The production method according to any one of <1> to <5> above, wherein the purified aqueous hydrogen peroxide solution has a total carbon concentration of less than 15 (mg-C / L) and contains, as carbon-containing components other than organic acids, one or more selected from polyols having 8 to 9 carbon atoms, monools having 9 carbon atoms, and compounds having 8 to 9 carbon atoms and having a ketone group.

[0022] <7> The production method according to <6> above, wherein the purified aqueous hydrogen peroxide solution further has an organic acid concentration of less than 12 (mg-C / L).

[0023] <8> A purified aqueous hydrogen peroxide solution obtained by the production method according to any one of <1> to <7> above.

[0024] <9> An aqueous hydrogen peroxide solution having a total carbon concentration of less than 15 (mg-C / L) and a ratio of an organic acid concentration to the total carbon concentration of 30% or more and 100% or less.

[0025] Effects of the Invention

[0026] The present invention can provide an aqueous hydrogen peroxide solution having a low total carbon concentration and a low organic acid concentration (particularly, a low acetic acid concentration) and a method for producing the same. DETAILED DESCRIPTION

[0027] Hereinafter, the present invention will be described in detail.

[0028] The method for producing a purified aqueous hydrogen peroxide solution of the present invention comprises: a step of contacting a crude aqueous hydrogen peroxide solution having a total carbon concentration of 15 to 500 (mg-C / L) and an organic acid concentration of 12 (mg-C / L) or higher with a solvent containing one or more selected from a polyol having 8 to 9 carbon atoms, a monool having 9 carbon atoms, and a compound having 8 to 9 carbon atoms and a ketone group (hereinafter sometimes referred to as the "contact step"); a step of separating the solvent from the aqueous hydrogen peroxide solution (hereinafter sometimes referred to as the "separation step"); and a step of purifying the separated aqueous hydrogen peroxide solution using a reverse osmosis membrane (hereinafter sometimes referred to as the "purification step").

[0029] Hereinafter, each step will be described in detail.

[0030] Contact process

[0031] The present invention produces purified aqueous hydrogen peroxide using a crude aqueous hydrogen peroxide solution having a total carbon concentration of 15 to 500 mg-C / L and an organic acid concentration of 12 mg-C / L or higher as the starting material. The total carbon concentration and organic acid concentration in the crude aqueous hydrogen peroxide solution can be measured using the methods described in the Examples below.

[0032] The total carbon concentration in the crude aqueous hydrogen peroxide solution is preferably 20 to 450 (mg-C / L), more preferably 25 to 400 (mg-C / L). Meanwhile, the organic acid concentration in the crude aqueous hydrogen peroxide solution is preferably 12 to 150 (mg-C / L), more preferably 15 to 200 (mg-C / L).

[0033] The crude aqueous hydrogen peroxide solution used in the present invention can be produced by any method, including those produced by the anthraquinone method, alcohol oxidation method, redox method, direct method (direct oxidation method), electrolysis method, etc. The crude aqueous hydrogen peroxide solution may contain one or both of organic and inorganic impurities. The concentration of hydrogen peroxide contained in the crude aqueous hydrogen peroxide solution is not particularly limited, and may be, for example, 20 to 90% by mass, 30 to 80% by mass, 35 to 70% by mass, 40 to 60% by mass, etc.

[0034] Examples of organic impurities include, for example, the working solution composition and its degradation products in the anthraquinone method. Examples of degradation products include non-polar solvent degradation products (e.g., benzaldehydes, benzoic acids, phenols, benzyl alcohols, etc.), polar solvent degradation products (e.g., 2-ethylhexanol, 2-ethylhexanal, etc.), and anthraquinone degradation products (e.g., anthrone, oxyanthrone, tetrahydroxyanthrone, anthraquinone epoxide, tetrahydroanthraquinone epoxide, etc.). Examples of inorganic impurities include copper, zinc, chromium, palladium, rhodium, ruthenium, platinum, iron, nickel, aluminum, sodium, potassium, calcium, chlorine, sulfur, silica, and boron.

[0035] In the contacting step, the crude aqueous hydrogen peroxide solution is brought into contact with a solvent containing one or more selected from the group consisting of a polyol having 8 to 9 carbon atoms, a monool having 9 carbon atoms, and a compound having 8 to 9 carbon atoms and a ketone group.

[0036] The above-mentioned solvent is a polar solvent. It is believed that contacting the solvent with the crude aqueous hydrogen peroxide solution can cause the organic acid (particularly acetic acid) in the crude aqueous hydrogen peroxide solution to migrate toward the polar solvent. In the present invention, the organic acid is preferably acetic acid. In addition to acetic acid, other organic acids include formic acid and propionic acid, but the amount thereof is slightly less than that of acetic acid.

[0037] Examples of polyols having 8 to 9 carbon atoms include, but are not limited to, 2-ethyl-1,3-hexanediol, 2,4-diethyl-1,5-pentanediol, 2-ethyl-1,3-hexanediol, 1,5-diacetoxypentane, and 2-(2,2-diethoxyethyl)-1,3-propylene glycol. These may be used alone or in combination of two or more.

[0038] Examples of the monohydric alcohol having 9 carbon atoms include, but are not limited to, diisobutyl carbinol, 1-nonanol, 2-nonanol, 4-nonanol, 5-nonanol, and 2-methyl-3-octanol. These may be used alone or in combination of two or more.

[0039] Examples of the compound having 8 to 9 carbon atoms and having a ketone group include, but are not limited to, diisobutyl ketone, 4-propylcyclohexanone, 2-propylcyclohexanone, 5-methyl-2-octanone, 3-nonanone, 2-nonanone, 4-nonanone, and 5-nonanone. These may be used alone or in combination of two or more.

[0040] In the present invention, the solvent preferably includes at least one selected from the group consisting of diisobutyl carbinol, 1-nonanol, 2-ethyl-1,3-hexanediol, 2,4-diethyl-1,5-pentanediol, and diisobutyl ketone.

[0041] The method for contacting the crude aqueous hydrogen peroxide solution with the solvent is not particularly limited, and examples thereof include a method of adding the crude aqueous hydrogen peroxide solution and the solvent to a container and stirring. The amounts of the crude aqueous hydrogen peroxide solution and the solvent used are preferably a volume ratio of crude aqueous hydrogen peroxide solution:solvent = 1:0.05 to 1:20, more preferably 1:0.1 to 1:10.

[0042] For stirring the crude aqueous hydrogen peroxide solution and the solvent, it is preferable to use a stirring blade such as a disk turbine blade, a propeller blade, a paddle blade, or a tilted paddle blade.

[0043] The stirring time is preferably 1 to 60 minutes, more preferably 3 to 50 minutes.

[0044] In the contacting step, the solvent used is preferably a mixed solvent containing 70% by volume or less of at least one solvent selected from an aromatic solvent and a hydrocarbon solvent having 5 to 10 carbon atoms.

[0045] Examples of aromatic solvents include, but are not limited to, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 1,2,3-trimethylbenzene, toluene, o-xylene, p-xylene, m-xylene, cumene, dimethylbenzene, propylbenzene, o-ethyltoluene, p-ethyltoluene, m-ethyltoluene, 2-propyltoluene, 3-propyltoluene, 4-propyltoluene, 1,3-diethylbenzene, p-diethylbenzene, 5-ethyl-m-xylene, 2-ethyl-p-xylene, 4-ethyl-o-xylene, 1,2,4,5-tetramethylbenzene, and 1,2,3,5-tetramethylbenzene. These may be used alone or in combination of two or more.

[0046] Examples of hydrocarbon solvents having 5 to 10 carbon atoms include, but are not limited to, pentane, 3-methylpentane, pentene, hexane, cyclohexane, heptane, 1-heptene, octane, 3-methylhexane, 2-methylheptane, 3,3-dimethylpentane, nonane, 4-octyne, 2-methylheptane, decane, 3-methylpentane, 2-methylpentane, 2-heptene, and 2,3-dimethyl-1-pentene. These solvents may be used alone or in combination of two or more.

[0047] In the present invention, the above-mentioned solvent is more preferably a mixed solvent containing 5 to 60 volume % of at least one selected from aromatic solvents and hydrocarbon solvents having 5 to 10 carbon atoms, and particularly preferably a mixed solvent containing 10 to 50 volume % of at least one selected from aromatic solvents and hydrocarbon solvents having 5 to 10 carbon atoms.

[0048] Furthermore, it is more effective to remove organic acids without adding the aforementioned aromatic or hydrocarbon solvents. However, C9 diols and C9 alcohols present the following issues: they are expensive and difficult to mix due to their high viscosity. Therefore, dilution with aromatic and / or hydrocarbon solvents, which are inexpensive, have low viscosity, and are easily miscible, is preferable.

[0049] Separation process

[0050] In the contacting step, the organic acid (particularly acetic acid) in the crude aqueous hydrogen peroxide solution is moved to the aforementioned specific solvent (polar solvent) side, and in the separating step, the solvent is separated from the aqueous hydrogen peroxide solution, thereby obtaining an aqueous hydrogen peroxide solution having a reduced concentration of the organic acid (particularly acetic acid).

[0051] The method for separating the solvent from the aqueous hydrogen peroxide solution is not particularly limited, and examples thereof include separation methods using a separatory funnel, a centrifugal separator, a coalescer, a settler, and the like.

[0052] The organic acid (particularly acetic acid) concentration in the aqueous hydrogen peroxide solution after the separation step is preferably 5 to 100 mg-C / L, more preferably 10 to 80 mg-C / L. Meanwhile, the total carbon concentration in the aqueous hydrogen peroxide solution after the separation step is higher than the total carbon concentration in the crude aqueous hydrogen peroxide solution before the separation step.

[0053] Purification process

[0054] The purification step is a step of purifying the aqueous hydrogen peroxide solution after the separation step using a reverse osmosis membrane. The purification step can reduce the total carbon concentration of the aqueous hydrogen peroxide solution after the separation step.

[0055] The reverse osmosis membrane used in the present invention is not particularly limited as long as it has the ability to reduce the total carbon concentration in the aqueous hydrogen peroxide solution after the separation process. Examples of the form of the reverse osmosis membrane include flat membranes, pleated membranes, spiral membranes, tubular membranes, rod membranes, capillary membranes, spaghetti membranes, or hollow fiber membranes, or combinations thereof. Examples of the material of the reverse osmosis membrane include polyethyleneimine condensates, cellulose acetate, modified polyacrylonitrile, polybenzimidazole pyrone, polyetheramide, cellulose triacetate, polyamide carboxylic acid, cross-linked polyether, cross-linked polyamide, polyimide, polybenzimidazole, sulfonated phenylene oxide, polypiperazinamide, polyethyleneimine, toluene diisocyanate, polyethyleneimine chloride, sulfonated polyfurfuryl alcohol, sulfonated polysulfone, polyether urea, polyvinyl alcohol, polysulfone, polyamide polyvinyl alcohol, sulfonated polyethersulfone, or polyamide. The reverse osmosis membrane may be an asymmetric membrane or a composite membrane. The reverse osmosis membrane is preferably a composite membrane formed of polyamide.

[0056] When the aqueous hydrogen peroxide solution after the separation step is brought into contact with the reverse osmosis membrane, the treatment pressure applied to the reverse osmosis membrane can be within the range permitted by the reverse osmosis membrane, typically 8 MPa or less, preferably in the range of 0.3 to 5.0 MPa. The treatment temperature is preferably such that the hydrogen peroxide does not decompose excessively, preferably in the range of -20 to 40°C, more preferably 5 to 25°C. The reverse osmosis membrane can be incorporated into a reverse osmosis membrane module for use. The reverse osmosis membrane module can include a reverse osmosis membrane and a pressure-resistant container that securely supports the reverse osmosis membrane, and can further include a pressurizing mechanism for bringing the aqueous hydrogen peroxide solution into contact with the reverse osmosis membrane.

[0057] (Purified aqueous hydrogen peroxide solution)

[0058] The aqueous hydrogen peroxide solution obtained through the above-mentioned contacting step, separation step, and purification step preferably has a total carbon concentration of less than 15 (mg-C / L), more preferably 2 to 12 (mg-C / L).

[0059] Furthermore, the purified aqueous hydrogen peroxide solution preferably contains, as carbon-containing components other than the organic acid, one or more selected from the group consisting of polyols having 8 to 9 carbon atoms, monools having 9 carbon atoms, and compounds having 8 to 9 carbon atoms and having a ketone group. In other words, the purified aqueous hydrogen peroxide solution preferably contains the solvent used in the contact step.

[0060] Furthermore, the purified aqueous hydrogen peroxide solution preferably has an organic acid concentration of less than 12 (mg-C / L), and more preferably has an organic acid concentration of 2 to 10 (mg-C / L).

[0061] One embodiment of the present invention is an aqueous hydrogen peroxide solution having a total carbon concentration of less than 15 mg-C / L and a ratio of organic acid concentration to the total carbon concentration of 30% to 100%. The total carbon concentration is preferably 2 to 12 mg-C / L. Furthermore, the ratio of organic acid concentration to the total carbon concentration is preferably 33% to 91%.

[0062] Example

[0063] The present invention will be described in detail with reference to the following examples, but the present invention is not limited thereto.

[0064] The total organic carbon concentration (TOC concentration) of the aqueous hydrogen peroxide solution was measured using the following apparatus and method.

[0065] The TC value was determined by measuring the TOC value using a TOC (total organic carbon) meter.

[0066] Device: TOC-L manufactured by Shimadzu Corporation

[0067] Measurement Method: A sample is heated to 680°C in a furnace filled with purified air over a platinum catalyst, causing combustion and decomposition to convert it into carbon dioxide. The resulting carbon dioxide is cooled and dehumidified, and then compared to a calibration curve to determine the TC (total carbon) concentration in the sample. Subsequently, the same sample is acidified and aerated to convert the IC (inorganic carbon) in the sample into carbon dioxide. The IC concentration is then measured and determined. The TOC concentration is calculated by subtracting the IC concentration from the TC concentration.

[0068] The concentration of organic acids contained in the aqueous hydrogen peroxide solution was measured using ion chromatography. The apparatus configuration is as follows.

[0069] Device: DIONEX ICS-2100

[0070] Separation column: IonPac AS11-HS

[0071] Guard column: IonPac AG11-HC

[0072] Concentration column: IonPac-AC15 (4mm)

[0073] Suppressor: ASRS-3000

[0074] Detector: Conductivity detector

[0075] <Measurement conditions>

[0076] Column box temperature: 37°C

[0077] Sample introduction volume: 25 μL

[0078] Eluent: Potassium hydroxide aqueous solution

[0079] Eluent flow rate: 1.5mL / min

[0080] <Eluent concentration and time program>

[0081] [Table 1]

[0082]

[0083] [Preparation Example 1]

[0084] The total carbon and acetic acid concentrations of commercially available industrial-grade hydrogen peroxide containing 60% by mass were measured. The total carbon concentration was 171 mg-C / L, and the acetic acid concentration was 44 mg-C / L. The ratio of the acetic acid concentration to the total carbon concentration was 26%.

[0085] (Example 1)

[0086] 1000 mL of the aqueous hydrogen peroxide solution containing acetic acid prepared in Preparation Example 1 and 2000 mL of diisobutylcarbinol were placed in a glass beaker and stirred for 15 minutes using a disc turbine blade (10 cm in diameter) at 600 rpm.

[0087] After stirring, the mixture was transferred to a separatory funnel to separate the aqueous hydrogen peroxide solution and diisobutylcarbinol. The recovered aqueous hydrogen peroxide solution was transferred to a glass beaker along with 2000 mL of fresh diisobutylcarbinol and stirred. Stirring was performed at 600 rpm for 15 minutes using a disk turbine blade (10 cm diameter).

[0088] After stirring, the mixture was transferred to a separatory funnel to separate the hydrogen peroxide solution and diisobutyl carbinol. The acetic acid concentration of the resulting hydrogen peroxide solution dropped to 10 mg-C / L. The total carbon concentration was 225 mg-C / L.

[0089] The resulting aqueous hydrogen peroxide solution was then purified using a laboratory-scale reverse osmosis membrane system. The resulting purified aqueous hydrogen peroxide solution had a total carbon concentration of 9 mg-C / L and an acetic acid concentration (organic acid concentration) of 8 mg-C / L. This means the ratio of the organic acid concentration to the total carbon concentration was 89%. In addition to the organic acids, diisobutyl carbinol was also detected in the purified aqueous hydrogen peroxide solution.

[0090] (Examples 2 to 5)

[0091] A purified aqueous hydrogen peroxide solution was produced in the same manner as in Example 1, except that the solvents listed in Table 2 below were used instead of diisobutylcarbinol in Example 1. The total carbon concentration and acetic acid concentration (organic acid concentration) of the purified aqueous hydrogen peroxide solution obtained, the ratio of the organic acid concentration to the total carbon concentration, and the main carbon-containing components detected other than organic acids are shown in Table 2.

[0092] (Examples 6 to 9)

[0093] A purified aqueous hydrogen peroxide solution was produced in the same manner as in Example 1, except that the mixed solvent or two solvents described in Table 2 below were used instead of diisobutylcarbinol in Example 1. The total carbon concentration and acetic acid concentration (organic acid concentration) of the purified aqueous hydrogen peroxide solution obtained, as well as the ratio of the organic acid concentration to the total carbon concentration, and the main carbon-containing components detected other than organic acids are shown in Table 2.

[0094] [Preparation Example 2]

[0095] The total carbon and acetic acid concentrations of commercially available industrial-grade hydrogen peroxide containing 60% by mass were measured. The total carbon concentration was 149 mg-C / L, the acetic acid concentration was 57 mg-C / L, and the ratio of the acetic acid concentration to the total carbon concentration was 38%.

[0096] (Example 10)

[0097] The acetic acid-containing aqueous hydrogen peroxide solution obtained in Preparation Example 2 was treated in the same manner as in Example 1 to obtain a purified aqueous hydrogen peroxide solution. The resulting purified aqueous hydrogen peroxide solution had a total carbon concentration of 10 mg-C / L and an acetic acid concentration of 8 mg-C / L, with the ratio of acetic acid concentration to total carbon concentration being 80%. In addition to organic acids, diisobutyl carbinol was also detected in the purified aqueous hydrogen peroxide solution.

[0098] (Comparative Example 1)

[0099] The aqueous hydrogen peroxide solution containing acetic acid obtained in Preparation Example 1 was purified using a laboratory-scale reverse osmosis membrane apparatus without contacting it with a solvent. The resulting purified aqueous hydrogen peroxide solution had a total carbon concentration of 45 mg-C / L and an acetic acid concentration of 44 mg-C / L. The ratio of the acetic acid concentration to the total carbon concentration was 98%.

[0100] (Comparative Example 2)

[0101] The acetic acid-containing aqueous hydrogen peroxide solution obtained in Preparation Example 2 was purified using a laboratory-scale reverse osmosis membrane purification apparatus without contacting the solution with a solvent. The resulting purified aqueous hydrogen peroxide solution had a total carbon concentration of 58 mg-C / L and an acetic acid concentration of 57 mg-C / L. The ratio of the acetic acid concentration to the total carbon concentration was 98%.

[0102] (Comparative Examples 3 to 8)

[0103] A purified aqueous hydrogen peroxide solution was produced in the same manner as in Example 1, except that the solvents listed in Table 2 below were used instead of diisobutylcarbinol. The total carbon concentration and acetic acid concentration (organic acid concentration) of the purified aqueous hydrogen peroxide solution obtained, as well as the ratio of the organic acid concentration to the total carbon concentration, are shown in Table 2.

[0104] [Table 2]

[0105]

[0106] Diisomethylcarbinol (C9 monohydric alcohol)

[0107]

[0108] 1-Nonanol (C9 monohydric alcohol)

[0109]

[0110] 2-Ethyl-1,3-hexanediol (C8 polyol)

[0111]

[0112] 2,4-Dimethyl-1,5-pentanediol (C9 polyol)

[0113]

[0114] Diisobutyl ketone (C9 ketone compound)

[0115]

[0116] 1-Octanol (C8 monohydric alcohol)

[0117]

[0118] 1-Heptanol (C7 monohydric alcohol)

[0119]

[0120] 1-Decanol ((C10 monohydric alcohol)

[0121]

[0122] Trioctyl phosphate

[0123] 1,2,4-Trimethylbenzene

[0124] Toluene

[0125]

Claims

1. A method for producing a purified aqueous hydrogen peroxide solution, characterized in that: include: A step of contacting a crude aqueous hydrogen peroxide solution having a total carbon concentration of 15 to 500 mg-C / L and an organic acid concentration of 12 mg-C / L or more with a solvent containing one or more selected from a polyol having 8 to 9 carbon atoms, a monool having 9 carbon atoms, and a compound having 8 to 9 carbon atoms and a ketone group; a step of separating the solvent from the aqueous hydrogen peroxide solution; and This is a process of purifying the separated aqueous hydrogen peroxide solution using a reverse osmosis membrane.

2. The manufacturing method according to claim 1, wherein: The organic acid concentration is acetic acid concentration.

3. The manufacturing method according to claim 1 or 2, wherein: The solvent includes one or more selected from the group consisting of diisobutyl carbinol, 1-nonanol, 2-ethyl-1,3-hexanediol, 2,4-diethyl-1,5-pentanediol, and diisobutyl ketone.

4. The manufacturing method according to any one of claims 1 to 3, wherein: In the contacting step, the solvent used is a mixed solvent containing 70% by volume or less of at least one solvent selected from an aromatic solvent and a hydrocarbon solvent having 5 to 10 carbon atoms.

5. The manufacturing method according to claim 4, wherein: The mixed solvent contains at least one selected from 1,2,4-trimethylbenzene, toluene and heptane.

6. The manufacturing method according to any one of claims 1 to 5, wherein: The purified aqueous hydrogen peroxide solution has a total carbon concentration of less than 15 mg-C / L and contains, as carbon-containing components other than organic acids, one or more selected from polyols having 8 to 9 carbon atoms, monools having 9 carbon atoms, and compounds having 8 to 9 carbon atoms and having a ketone group.

7. The manufacturing method according to claim 6, wherein: The purified aqueous hydrogen peroxide solution also has an organic acid concentration of less than 12 mg-C / L.

8. A purified aqueous hydrogen peroxide solution, characterized in that: This is obtained by the production method according to any one of claims 1 to 7.

9. An aqueous hydrogen peroxide solution, characterized in that: The total carbon concentration is less than 15 mg-C / L, and the ratio of the organic acid concentration to the total carbon concentration is 30% or more and 100% or less.

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