Activated carbon molded body and its manufacturing method

Abstract

To provide a material capable of removing substances of large molecular weight such as coloring ingredients regardless of liquid viscosity and also suppressing cracking.SOLUTION: An activated carbon molded article comprises woody activated carbon, powdered activated carbon and / or fibrous activated carbon other than the woody activated carbon, and a binder. When the total amount of the activated carbon molding is 100 mass%, the binder represents 0 to 11.0 mass%.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an activated carbon molded body and a method for producing the same. [Background technology]

[0002] Activated carbon has excellent ability to adsorb various harmful substances, malodorous substances, etc., and has been used as an adsorbent in many fields, both for household and industrial use. For example, Patent Document 1 discloses an adsorption filter that uses coconut shell activated carbon as the main raw material and has excellent water permeability and high adsorption performance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2016 / 080241 Summary of the Invention [Problem to be solved by the invention]

[0004] However, as described in Patent Document 1, when coconut shell activated carbon is used, the meso-efficiency is low, and although high performance can be obtained in deodorizing applications such as VOC removal, high performance cannot be obtained in applications such as decolorization.

[0005] On the other hand, wood flour activated carbon may be used for substances with large molecular weights such as coloring components, but when wood flour activated carbon is used, there is a problem that it generates powder, which is unique to wood flour activated carbon, and a separation process is required from the treated liquid. In particular, when decolorizing highly viscous liquids, separation is difficult, and there is a problem that wood flour activated carbon cannot be used as a powder.

[0006] Furthermore, although wood flour activated carbon moldings have the advantage of being light and soft, they also have the drawback of being weak in strength and prone to cracking when dried after molding.

[0007] The present invention has been made in view of the above, and aims to provide a material that can remove substances with large molecular weights, such as coloring components, regardless of liquid viscosity and can also suppress cracking. [Means for solving the problem]

[0008] The present inventors have conducted extensive research to achieve the above-mentioned object and have found that by forming a molded body containing a combination of wood activated carbon and another activated carbon and a specific amount of binder, it is possible to remove substances with high molecular weights, such as coloring components, regardless of the liquid viscosity and to suppress cracking of the molded body. Based on this finding, the present inventors have conducted further research and have completed the present invention. That is, the present invention includes, for example, the following configurations.

[0009] Item 1. Contains wood activated carbon, powdered activated carbon and / or fibrous activated carbon other than the wood activated carbon, and a binder, and Activated carbon molded body containing 0 to 11.0 mass % of a binder, with the total mass of the activated carbon molded body being 100 mass %.

[0010] Item 2. The activated carbon molded body according to Item 1, wherein the mesopore volume in the pore volume distribution of the wood activated carbon is 30% or more.

[0011] Item 3. The activated carbon molded body according to Item 1 or 2, wherein the wood activated carbon is wood flour activated carbon.

[0012] Item 4. The activated carbon molded body according to any one of Items 1 to 3, wherein the activated wood carbon is contained in an amount of 20 to 85% by mass, with the total amount of the activated carbon molded body being 100% by mass.

[0013] Item 5. The activated carbon molded body according to any one of Items 1 to 4, wherein the powdered activated carbon is coconut shell activated carbon.

[0014] Item 6. The activated carbon molded body according to any one of Items 1 to 5, wherein the powdered activated carbon and / or fibrous activated carbon accounts for 10 to 75 mass % of the total amount of the activated carbon molded body, taken as 100 mass %.

[0015] Item 7. The activated carbon molded body according to any one of Items 1 to 6, wherein the binder is a fibrous binder.

[0016] Item 8. The activated carbon molded body according to Item 7, wherein the fiber binder is an organic fiber binder.

[0017] Item 9. The activated carbon molded body according to any one of Items 1 to 8, which is cylindrical.

[0018] Item 10. The activated carbon molded body according to any one of Items 1 to 9, having a thickness of 1.0 to 20 mm.

[0019] Item 11. A method for producing the activated carbon molded body according to any one of items 1 to 10, A step of suction molding from activated carbon slurry containing activated carbon powder and / or activated carbon fibrous other than activated carbon, and a binder, the binder content being 0 to 11.0% by mass, where the total amount of activated carbon and binder is 100% by mass. A manufacturing method comprising: [Effects of the Invention]

[0020] The activated carbon molded body of the present invention can remove substances with large molecular weights, such as coloring components, regardless of the viscosity of the liquid, and can also prevent the molded body from cracking. DETAILED DESCRIPTION OF THE INVENTION

[0021] In this specification, the term "containing" is a concept that encompasses all of "comprise," "consist essentially of," and "consist only of."

[0022] In addition, in this specification, when a numerical range is expressed as "A to B," it means A or more and B or less.

[0023] The activated carbon molded body of the present invention contains wood flour activated carbon, powdered activated carbon other than wood activated carbon and / or fibrous activated carbon, and a binder, and contains 0 to 11.0 mass% of the binder, with the total mass of the activated carbon molded body being 100 mass%.

[0024] 1. Wood activated carbon In the present invention, the wood activated carbon is intended to adsorb and remove polymers and the like in industrial applications.

[0025] The mesopore volume in the pore volume distribution of wood activated carbon is preferably 30% or more, more preferably 50 to 95%, from the viewpoint of facilitating adsorption and removal of polymers, etc. Wood activated carbon tends to have a large mesopore volume, but when a chemical activation method (particularly activation with zinc chloride) is employed, which will be described later, the mesopore volume can be reduced. In the case of wood flour-derived zinc chloride carbon used in this invention, the mesopore volume is particularly large, often reaching 50% or more. In the present invention, mesopores refer to pores with a diameter of 2 to 50 nm.

[0026] Of the carbon sources typically used as raw materials for activated carbon, it is preferable to use wood flour, wood, by-products from pulp production, etc. as the activated carbon precursor for this wood activated carbon. This makes it easier to obtain wood activated carbon with a large mesopore volume, making it easier to adsorb substances with large molecular weights, such as coloring components.

[0027] The activated carbon precursor may be a material that has been previously subjected to a carbonization treatment or a stabilization treatment by a conventional method. Carbonization refers to a treatment that releases elements other than carbon by heat treatment to produce a solid with a high carbon content, and stabilization refers to a treatment that increases thermosetting properties by oxidative dehydrogenation cyclization, condensation, etc. so that the desired shape can be maintained, and oxygen can be introduced into the activated carbon precursor to stabilize it through cross-linking with oxygen.

[0028] The carbonization atmosphere is preferably a non-oxidizing gas atmosphere, such as an inert gas such as nitrogen, argon, xenon, neon, helium, carbon dioxide, carbon monoxide, or combustion exhaust gas, or a mixed gas containing such an inert gas as a main component and other gases.

[0029] Other conditions for the carbonization treatment (such as the rate of temperature rise) are not particularly limited and can be set appropriately depending on the intended use, etc.

[0030] The infusibilization treatment may be carried out, for example, by applying hot air to the activated carbon precursor.

[0031] The atmosphere for the infusibilization treatment is preferably an oxygen-containing atmosphere, for example, one or more of air, oxygen, ozone, nitrogen oxides (such as nitric oxide), sulfur oxide, sulfurous acid, and the like.

[0032] The temperature for the infusibilization treatment is preferably a temperature at which the raw carbonaceous material does not soften or deform, for example, preferably 200 to 500°C, more preferably 250 to 350°C.

[0033] The time for the infusibilization treatment is not particularly limited, and from the viewpoint of productivity, it is preferably 1 to 10 hours, more preferably 1.5 to 6 hours.

[0034] Other conditions for the infusibility treatment (such as the rate of temperature rise) are not particularly limited and can be appropriately set depending on the intended use and the like.

[0035] Examples of the method used for activating the activated carbon precursor include known methods for producing activated carbon, such as a fixed bed method, a moving bed method, a fluidized bed method, and a rotary kiln method.

[0036] Examples of activation methods for activated carbon precursors include gas activation and chemical activation. Chemical activation, in particular, can increase the surface area and produce activated carbon with a large mesopore volume, making it easier to adsorb and remove polymers such as coloring components in industrial applications. Furthermore, chemically activated activated carbon contains many functional groups, particularly those containing oxygen atoms, which can coordinate with impurity metals to achieve a higher adsorption effect.

[0037] When the gas activation method is employed, the activation atmosphere may be, for example, a water vapor gas atmosphere, a carbon dioxide gas atmosphere, a mixed gas atmosphere of water vapor and carbon dioxide, a mixed gas atmosphere of water vapor and / or carbon dioxide and nitrogen, etc. Among these, the water vapor gas atmosphere, the mixed gas atmosphere of water vapor and carbon dioxide, and the mixed gas atmosphere of water vapor and nitrogen are preferred because they have a faster reaction rate. An activation gas containing water vapor, such as a mixed gas atmosphere or a mixed gas atmosphere of water vapor, carbon dioxide, and nitrogen, is preferred, with a water vapor gas atmosphere being more preferred. When a mixed gas atmosphere is used, the flow rate ratio of each component can be about 10 to 90% by volume. When water vapor gas is used as the activation gas, the water vapor partial pressure is preferably 10 to 100% by volume, more preferably 30 to 95% by volume.

[0038] When gas activation is employed, the activation temperature is not particularly limited and can be set according to the desired performance (particularly, cracking of the molded body, adsorption performance, etc.), and is, for example, preferably 750 to 1200° C., more preferably 800 to 1100° C. By setting the activation temperature within this range, activated carbon with more appropriate performance (particularly, cracking of the molded body, adsorption performance, etc.) can be obtained.

[0039] The activation time when the gas activation method is employed is not particularly limited and may be set according to the desired performance (particularly, cracking of the molded body, adsorption performance, etc.), and is preferably 30 to 300 minutes, more preferably 90 to 200 minutes. By setting the activation time within this range, activated carbon with more appropriate performance (particularly, cracking of the molded body, adsorption performance, etc.) can be obtained.

[0040] Furthermore, when a chemical activation method is employed, examples of the activation chemical include sodium hydroxide, potassium hydroxide, potassium carbonate, potassium sulfide, zinc chloride, phosphoric acid, etc., and from the viewpoints of cracking of the molded body, adsorption performance, etc., zinc chloride, phosphoric acid, etc. are particularly preferred, with zinc chloride being more preferred.

[0041] When a chemical activation method is employed, the activation temperature is not particularly limited and can be set according to the desired performance (particularly, cracking of the molded body, adsorption performance, etc.), and is, for example, preferably 500 to 800° C., more preferably 550 to 750° C. By setting the activation temperature within this range, activated carbon with more appropriate performance (particularly, cracking of the molded body, adsorption performance, etc.) can be obtained.

[0042] The activation time when chemical activation is employed is not particularly limited and may be set according to the desired performance (particularly, cracking of the molded body, adsorption performance, etc.), and is preferably 10 to 300 minutes, more preferably 20 to 200 minutes. By setting the activation time within this range, activated carbon with more appropriate performance (particularly, cracking of the molded body, adsorption performance, etc.) can be obtained.

[0043] After the activation treatment, if necessary, inorganic matter (ash content) in the carbon can be demineralized by washing with dilute hydrochloric acid, an aqueous alkali solution, etc., and then purified by repeated washing with water, followed by drying and sieving.

[0044] 2.Powdered activated carbon In the present invention, the powdered activated carbon is intended to improve moldability while suppressing cracking of the activated carbon molded body, and powdered activated carbon other than the above-mentioned wood-based activated carbon can be used.

[0045] From the viewpoint of easily suppressing cracking of the activated carbon molded body and easily improving moldability, this powdered activated carbon preferably has an activated carbon hardness of 90% or more, more preferably 95% or more, as measured in accordance with JIS K 1474. The higher the activated carbon hardness, the better, and although there is no particular upper limit, it is usually 99.9% or less.

[0046] The activated carbon precursor for this powdered activated carbon is not particularly limited as long as it is a carbon source that is normally used as a raw material for activated carbon, and examples thereof include plant materials other than wood, such as coconut shells, bagasse, and blackstrap molasses; fossil materials, such as peat, lignite, brown coal, bituminous coal, anthracite, petroleum distillation residue components, petroleum pitch, coke, and coal tar; synthetic resins, such as phenolic resin, vinyl chloride resin, vinyl acetate resin, melamine resin, urea resin, resorcinol resin, celluloid, epoxy resin, polyurethane resin, polyester resin, acrylic resin, and polyamide resin; synthetic rubbers, such as polybutylene, polybutadiene, and polychloroprene; synthetic wood; and synthetic pulp. Among these, plant materials are preferred from the viewpoint of low impurity content, and coconut shells are particularly preferred from the viewpoint of easily adsorbing polymers such as coloring components when combined with the above-mentioned activated wood carbon to produce a molded body, and of easily improving moldability while suppressing cracking of the activated carbon molded body. These powdered activated carbons can be used alone or in combination of two or more types.

[0047] The activated carbon precursor may be a material that has been previously subjected to a carbonization treatment or a stabilization treatment by a conventional method. Carbonization refers to a treatment that releases elements other than carbon by heat treatment to produce a solid with a high carbon content, and stabilization refers to a treatment that increases thermosetting properties by oxidative dehydrogenation cyclization, condensation, etc. so that the desired shape can be maintained, and oxygen can be introduced into the activated carbon precursor to stabilize it through cross-linking with oxygen.

[0048] The carbonization atmosphere is preferably a non-oxidizing gas atmosphere, such as an inert gas such as nitrogen, argon, xenon, neon, helium, carbon dioxide, carbon monoxide, or combustion exhaust gas, or a mixed gas containing such an inert gas as a main component and other gases.

[0049] Other conditions for the carbonization treatment (such as the rate of temperature rise) are not particularly limited and can be set appropriately depending on the intended use, etc.

[0050] The infusibilization treatment may be carried out, for example, by applying hot air to the activated carbon precursor.

[0051] The atmosphere for the infusibilization treatment is preferably an oxygen-containing atmosphere, for example, one or more of air, oxygen, ozone, nitrogen oxides (such as nitric oxide), sulfur oxide, sulfurous acid, and the like.

[0052] The temperature for the infusibilization treatment is preferably a temperature at which the raw carbonaceous material does not soften or deform, for example, preferably 200 to 500°C, more preferably 250 to 350°C.

[0053] The time for the infusibilization treatment is not particularly limited, and from the viewpoint of productivity, it is preferably 1 to 10 hours, more preferably 1.5 to 6 hours.

[0054] Other conditions for the infusibility treatment (such as the rate of temperature rise) are not particularly limited and can be appropriately set depending on the intended use and the like.

[0055] Examples of the method used for activating the activated carbon precursor include known methods for producing activated carbon, such as a fixed bed method, a moving bed method, a fluidized bed method, and a rotary kiln method.

[0056] Examples of methods for activating the activated carbon precursor include gas activation, etc. Gas activation can improve the strength of the resulting activated carbon molded body, suppress cracking, and also improve moldability.

[0057] When a gas activation method is employed, the activation atmosphere may be, for example, a water vapor gas atmosphere, a carbon dioxide gas atmosphere, a mixed gas atmosphere of water vapor and carbon dioxide, or a mixed gas atmosphere of water vapor and / or carbon dioxide and nitrogen. Among these, activation gases containing water vapor, such as a water vapor gas atmosphere, a mixed gas atmosphere of water vapor and carbon dioxide, a mixed gas atmosphere of water vapor and nitrogen, or a mixed gas atmosphere of water vapor, carbon dioxide, and nitrogen, are preferred because they have a faster reaction rate, and a water vapor gas atmosphere is more preferred. When a mixed gas atmosphere is used, the flow rate ratio of each component can be about 10 to 90% by volume. When water vapor gas is used as the activation gas, the partial pressure of the water vapor is preferably 10 to 100% by volume, 30 to 95% by volume is more preferable.

[0058] When gas activation is employed, the activation temperature is not particularly limited and can be set according to the desired performance (particularly, cracking of the molded body, adsorption performance, etc.), and is, for example, preferably 750 to 1200° C., more preferably 800 to 1100° C. By setting the activation temperature within this range, activated carbon with more appropriate performance (particularly, cracking of the molded body, adsorption performance, etc.) can be obtained.

[0059] The activation time when the gas activation method is employed is not particularly limited and may be set according to the desired performance (particularly, cracking of the molded body, adsorption performance, etc.), and is preferably 30 to 300 minutes, more preferably 90 to 200 minutes. By setting the activation time within this range, activated carbon with more appropriate performance (particularly, cracking of the molded body, adsorption performance, etc.) can be obtained.

[0060] After the activation treatment, if necessary, inorganic matter (ash content) in the carbon can be demineralized by washing with dilute hydrochloric acid, an aqueous alkali solution, etc., and then purified by repeated washing with water, followed by drying and sieving.

[0061] 3. Fibrous activated carbon Fibrous activated carbon means activated carbon that is in the form of fibres.

[0062] The average fiber diameter of the fibrous activated carbon is preferably 3 to 50 μm, and more preferably 5 to 30 μm, from the viewpoints that by combining it with the above-mentioned wood-based activated carbon to produce a molded body, it is easy to adsorb polymers such as coloring components, and it is easy to suppress cracking of the activated carbon molded body and to improve moldability. The average particle diameter of the fibrous activated carbon is measured by measuring the fiber length using a microscope and then determining the number distribution.

[0063] The average fiber length of the fibrous activated carbon is preferably 50 to 300 μm, and more preferably 50 to 200 μm, from the viewpoints of easily adsorbing polymers such as coloring components by combining it with the above-mentioned wood-based activated carbon to produce a molded body, easily suppressing cracking of the activated carbon molded body, and easily improving moldability. The average particle length of the fibrous activated carbon is measured using a microscope and then determined from the number distribution.

[0064] The above-mentioned fibrous activated carbon may be a known or commercially available product. These fibrous activated carbons may be used alone or in combination of two or more.

[0065] 4. Binder As the binder, a fibrous binder is preferred from the viewpoint that by combining the above-mentioned wood activated carbon with powdered activated material and / or fibrous activated carbon to produce a molded body, it is easy to adsorb polymers such as coloring components, and it is easy to suppress cracking and improve moldability.

[0066] Such a fiber binder is preferably one that can entangle and shape the above-mentioned wood activated carbon with powdered activated carbon and / or fibrous activated carbon by fibrillation, and can be widely used, regardless of whether it is a synthetic product or a natural product. Particularly preferred examples of such a fiber binder include organic fiber binders such as acrylic fiber, polyacrylonitrile fiber, and cellulose fiber. These binders can be used alone or in combination of two or more.

[0067] The freeness of the binder is preferably 100 mL or less, more preferably 1 to 60 mL, from the viewpoint that the production of a molded body by combining the above-mentioned wood flour activated carbon with powdered activated material and / or fibrous activated carbon facilitates adsorption of polymers such as coloring components, and facilitates suppression of cracking of the activated carbon molded body and improved moldability. The average particle size of the binder is measured using a Canadian standard freeness tester in accordance with JIS P8121.

[0068] 5. Activated carbon molded body The activated carbon molded body of the present invention contains the above-mentioned binder in an amount of 0 to 11.0 mass % based on 100 mass % of the total amount of the activated carbon molded body.

[0069] The content of the wood-based activated carbon is preferably 20 to 90% by mass, more preferably 25 to 85% by mass, and even more preferably 30 to 80% by mass, based on 100% by mass of the total amount of activated carbon molded bodies, from the viewpoints of facilitating adsorption and removal of polymers such as coloring components, suppressing cracking of the activated carbon molded body of the present invention, and improving moldability in industrial applications. When emphasis is placed on ease of adsorption and removal of polymers such as coloring components in industrial applications, the content is preferably 40 to 90% by mass (particularly 50 to 80% by mass), based on 100% by mass of the total amount of activated carbon molded bodies. When emphasis is placed on suppressing cracking of the activated carbon molded body of the present invention and improving moldability, the content is preferably 20 to 70% by mass (particularly 30 to 60% by mass), based on 100% by mass of the total amount of activated carbon molded bodies. When two or more types of wood-based activated carbon are used, it is preferable to adjust the total amount thereof to be within the above range.

[0070] The content of powdered activated carbon and / or fibrous activated carbon is preferably 10 to 80 mass%, more preferably 15 to 75 mass%, and even more preferably 20 to 70 mass%, based on the total mass of the activated carbon molded body (100 mass%), from the viewpoints of facilitating adsorption and removal of polymers such as coloring components, facilitating cracking of the activated carbon molded body of the present invention, and facilitating moldability. When emphasis is placed on ease of adsorption and removal of polymers such as coloring components in industrial applications, the content is preferably 10 to 60 mass% (particularly 20 to 50 mass%), based on the total mass of the activated carbon molded body (100 mass%). When emphasis is placed on facilitating cracking of the activated carbon molded body of the present invention and facilitating moldability, the content is preferably 30 to 80 mass% (particularly 40 to 70 mass%), based on the total mass of the activated carbon molded body (100 mass%). When two or more types of powdered activated carbon and / or fibrous activated carbon are used, it is preferable to adjust the total amount thereof to be within the above range.

[0071] When a binder is used, the content of the binder is 0 to 11.0% by mass, preferably 0.1 to 10.5% by mass, and more preferably 0.2 to 10.0% by mass, based on 100% by mass of the total amount of the activated carbon molded body. If the content of the binder exceeds 11.0% by mass, it will be impossible to adsorb and remove polymers such as adsorbent components in industrial applications, and it will not be possible to suppress cracking of the activated carbon molded body of the present invention, nor will it be possible to improve moldability.

[0072] The shape of the activated carbon molded body of the present invention is not particularly limited, and it can be molded into various shapes such as a cylindrical shape, a tablet shape, a honeycomb shape, a sheet shape, etc. Among these, a cylindrical shape is preferred from the viewpoint of fitting into a housing for a general industrial filter.

[0073] The shape of the activated carbon molded body of the present invention is not particularly limited, and its thickness is preferably 1.0 to 20 mm, more preferably 1.1 to 15 mm, from the viewpoints of facilitating adsorption and removal of polymers such as coloring components in industrial applications, facilitating suppression of cracking of the activated carbon molded body of the present invention, and facilitating improvement of moldability.

[0074] The activated carbon molded body of the present invention as described above can effectively adsorb and remove polymers such as coloring components, is easily inhibited from cracking, and has excellent moldability, and therefore can be used for purposes such as refining, decolorizing, and extraction of functional foods, etc.; decolorizing and refining raw resin materials; refining and decolorizing of edible oils, industrial oils, etc.; refining and decolorizing in sake brewing; and refining and decolorizing of functional resins, and is particularly suitable for use as a filter for treating liquids containing coloring components.

[0075] The activated carbon molded body of the present invention as described above contains, for example, wood activated carbon, powdered activated carbon and / or fibrous activated carbon other than the wood activated carbon, and a binder, and the activated carbon and the binder The activated carbon slurry containing 0 to 11.0% by mass of the binder, with the total amount of the binder being 100% by mass, can be produced by suction molding.

[0076] The activated carbon slurry contains wood-based activated carbon, powdered activated carbon and / or fibrous activated carbon, and a binder, and can be made into a slurry using a solvent such as water.

[0077] The suction molding is not particularly limited and can be carried out in a conventional manner using a suction pump. The activated carbon molded body of the present invention can be produced by suction molding, but it can also be dried after suction molding. The drying conditions are also not particularly limited and can be carried out in a conventional manner.

[0078] The molding method is not limited to the above-mentioned suction molding method, and other methods such as compression molding using a press and extrusion molding in which molding is performed by extrusion can also be used.

[0079] Furthermore, sink marks and tiny cracks may occur on the edge surfaces during molding, but these can be made even less likely to occur by adding a taper to the mold on the edge surface or by changing the mold structure. [Example]

[0080] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples.

[0081] The materials used in the following examples are as follows: Wood flour activated carbon (1): Powdered zinc chloride carbon (mesopore volume 84%, activated with zinc chloride) manufactured by Osaka Gas Chemicals Co., Ltd. Wood flour activated carbon (2): Powdered steam-activated carbon (mesopore volume 59%, steam activated) manufactured by Osaka Gas Chemicals Co., Ltd. Coconut shell activated carbon (1): Crushed coconut carbon A manufactured by Osaka Gas Chemicals Co., Ltd. (iodine adsorption capacity according to JIS K1474: 950 mg / g, activated carbon hardness: 95% or more, steam activated) Coconut shell activated carbon (2): Crushed coconut carbon B manufactured by Osaka Gas Chemicals Co., Ltd. (iodine adsorption capacity according to JIS K1474: 1,470 mg / g, activated carbon hardness: 95% or more, steam activated) Coconut shell activated carbon (3): Crushed coconut activated carbon C manufactured by Osaka Gas Chemicals Co., Ltd. (iodine adsorption capacity according to JIS K1474: 1,250 mg / g, activated carbon hardness: 95% or more, steam activated) Granular wood charcoal: Granular zinc chloride charcoal manufactured by Osaka Gas Chemicals Co., Ltd. (iodine adsorption capacity according to JIS K1474: 1,010 mg / g, activated carbon hardness: 60% or less, activated with zinc chloride) Fibre activated carbon: Activated carbon fiber manufactured by Osaka Gas Chemicals Co., Ltd. (average fiber diameter 10-20 μm, average fiber length 100-200 μm) Fiber binder (1): Bi-PUL50TWF manufactured by Toyobo Co., Ltd. (beaten in a food mixer; freeness according to JIS P8121: approximately 47 to 60 mL) Fiber binder (2): Bi-PUL50TWF manufactured by Toyobo Co., Ltd. (industrial beater beaten product; freeness according to JIS P8121: 47 mL or less).

[0082] Examples 1 to 5 and Comparative Examples 1 to 4 Wood flour activated carbon (1), coconut shell activated carbon (1) or (2), fiber binder (1), and optionally fibrous activated carbon were dissolved in water as a solvent to give an activated carbon concentration of 1.5 kg / 50 L, to obtain an activated carbon slurry having the composition shown in Table 1 below.

[0083] The obtained activated carbon slurry was suction molded using a suction pump and then dried overnight at 110°C to obtain cylindrical activated carbon molded bodies with a diameter of 60 mm and a thickness of 1.2 mm. In Table 1, "manual molding" in Examples 1 to 5 and Comparative Examples 1 to 4 indicates that the activated carbon was manually molded using a suction pump. This means that suction molding was performed by the work, and the "automatic molding machine" in Example 5 means that suction molding was performed by mechanically operating a suction pump.

[0084] The appearance of the obtained activated carbon molded body was then visually inspected for cracks, and those with visible cracks, even if they were minute, were rated as "cracked," while those with minute cracks of 10 mm or less that could not be visually observed were rated as "no cracks."

[0085] The results are shown in Table 1.

[0086] [Table 1]

[0087] Examples 6 to 8 and Comparative Example 5 70 parts by mass of wood flour activated carbon (1) or (2), 20 parts by mass of coconut shell activated carbon (3), activated carbon fiber or granular wood carbon, and 10 parts by mass of fiber binder (2) were dissolved in water as a solvent so that the activated carbon concentration was 15 to 25 kg / 300 L, to obtain an activated carbon slurry.

[0088] The obtained activated carbon slurry was charged into a suction pump using an automatic molding machine, suction molded, and then dried overnight at 110°C to obtain cylindrical activated carbon molded bodies with a diameter of 61 mm and a thickness of 1.2 mm.

[0089] Based on this, those that could be molded to a diameter of approximately 60 mm or more were evaluated as having moldability, and those that could only be molded to a diameter of less than approximately 60 mm were evaluated as not having moldability.

[0090] The results are shown in Table 2.

[0091] [Table 2]

[0092] Example 5 and Comparative Examples 6 to 7 Wood flour activated carbon (1), coconut shell activated carbon (1) or (2), and fiber binder (1) were dissolved in water as a solvent so that the activated carbon concentration was 1.5 kg / 50 L, to obtain an activated carbon slurry having the composition shown in Table 3 below.

[0093] The obtained activated carbon slurry was charged into a suction pump using an automatic molding machine, suction molded, and then dried overnight at 110°C to obtain cylindrical activated carbon molded bodies with a diameter of 61 mm and a thickness of 1.2 mm.

[0094] Using the obtained activated carbon molding, a filter was made into a test piece with an outer diameter of 61 mm, an inner diameter of 30 mm, and a length of 24 mm. A test piece of Higashimaru dark soy sauce diluted 10 times was applied to the filter. 3 L of the test solution was circulated at a rate of 175 cc / min using a liquid pump, and after 120 hours of treatment, the UV-vis absorbance of the test solution was measured, measuring the absorbance at 460 nm. The removal rate was calculated from the absorbance before circulation, and the results are shown in Table 3.

[0095] [Table 3]

Claims

1. A method for producing a cellulose ester-based cellulose membrane comprising: wood flour activated carbon; powdered activated carbon other than wood activated carbon and / or fibrous activated carbon; and a binder; The binder is contained in an amount of 7.0 to 11.0% by mass, with the total amount of the activated carbon molded body being 100% by mass, The total amount of the activated carbon molded body is 100% by mass, and the wood flour activated carbon is contained in an amount of 40 to 80% by mass. The binder is a fiber binder. Activated carbon molded body.

2. 2. The activated carbon molded body according to claim 1, wherein the wood flour activated carbon has a mesopore volume of 30% or more in a pore volume distribution.

3. 3. The activated carbon molded body according to claim 1, wherein the powdered activated carbon is coconut shell activated carbon.

4. 4. The activated carbon molded body according to claim 1, wherein the activated carbon powder and / or the activated carbon fiber is contained in an amount of 10 to 50 mass % based on 100 mass % of the total amount of the activated carbon molded body.

5. The activated carbon molded body according to any one of claims 1 to 4, wherein the fiber binder is an organic fiber binder.

6. The activated carbon molded body according to any one of claims 1 to 5, which is cylindrical.

7. The activated carbon molded body according to claim 6, having a thickness of 1.0 to 20 mm.

8. 8. The activated carbon molded body according to claim 7, having a diameter of 60 mm or more.

9. A method for producing the activated carbon molded body according to any one of claims 1 to 8, The present invention relates to a method for producing an activated carbon material, comprising: a wood powder activated carbon; a powdered activated carbon other than wood activated carbon and / or a fibrous activated carbon; and a binder; A step of suction molding from activated carbon slurry containing 7.0 to 11.0% by mass of binder, with the total amount of activated carbon and binder being 100% by mass. Equipped with The binder is a fiber binder. Manufacturing method.

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