Activated carbon molded article and production method of the same

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 Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

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

[0005] On the other hand, for substances with a large molecular weight such as coloring components, it is also conceivable to use wood powder activated carbon. However, when using wood powder activated carbon, there is a problem that powdering peculiar to wood powder activated carbon occurs and a separation step from the treatment liquid is required. In particular, in the decolorization of highly viscous liquids, separation is difficult, and there is a problem that wood powder activated carbon cannot be used as it is in powder form.

[0006] In addition, although the molded body made of wood powder activated carbon has the advantage of being light and soft, on the contrary, it has a problem that its strength is low and the molded body is likely to crack during drying after molding.

[0007] The present invention has been made in view of the above, and an object thereof is to provide a material that can remove substances with a large molecular weight such as coloring components regardless of liquid viscosity and can also suppress cracking.

Means for Solving the Problems

[0008] As a result of intensive studies to achieve the above object, the present inventor has found that by using a molded body containing a combination of woody activated carbon and other activated carbons and containing a specific amount of a binder, substances with a large molecular weight such as coloring components can be removed regardless of liquid viscosity, and cracking of the molded body can also be suppressed. Based on such findings, the present inventor further repeated studies and completed the present invention. That is, the present invention includes, for example, the following configurations.

[0009] Item 1. An activated carbon molded body containing woody activated carbon, powdered activated carbon and / or fibrous activated carbon other than the woody activated carbon, and a binder, and The activated carbon molded body contains 0 to 11.0% by mass of the binder with the total amount of the activated carbon molded body being 100% by mass.

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

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

[0012] Item 4. The activated carbon molded body according to any one of Items 1 to 3, wherein the woody activated 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 is contained in an amount of 10 to 75% by mass with the total amount of the activated carbon molded body being 100% by mass.

[0015] Item 7. The activated carbon molded body according to any one of Items 1 to 6, wherein the binder is a fiber 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 manufacturing the activated carbon molded body according to any one of Items 1 to 10, comprising a step of suction molding from an activated carbon slurry containing woody activated carbon, powdered activated carbon and / or fibrous activated carbon other than the woody activated carbon, and a binder, and containing 0 to 11.0% by mass of the binder with the total amount of the activated carbon and the binder being 100% by mass. The manufacturing method comprising this.

Effect of the Invention

[0020] The activated carbon molded body of the present invention can remove substances with a large molecular weight such as coloring components regardless of liquid viscosity, and can also suppress cracking of the molded body.

Mode for Carrying Out the Invention

[0021] In this specification, "containing" is a concept encompassing any of "comprise", "consist essentially of", and "consist of".

[0022] Also, in this specification, when a numerical range is indicated 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 powder activated carbon, powdered activated carbon other than woody activated carbon and / or fibrous activated carbon, and a binder, and contains 0 to 11.0% by mass of the binder based on 100% by mass of the total amount of the activated carbon molded body.

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

[0025] From the viewpoint of easily adsorbing and removing polymers and the like, the mesopore volume in the pore volume distribution of the woody activated carbon is preferably 30% or more, more preferably 50 to 95%. The woody activated carbon tends to have a large mesopore volume. However, when the chemical activation method described below is adopted (particularly, in the case of zinc chloride-activated charcoal derived from wood powder using zinc chloride activation), the mesopore volume is particularly large and often exceeds 50%. In the present invention, the mesopore means a pore having a diameter of 2 to 50 nm. In the case of using the zinc chloride-activated charcoal derived from wood powder using zinc chloride activation, the mesopore volume is particularly large and often exceeds 50%. In the present invention, the mesopore means a pore having a diameter of 2 to 50 nm.

[0026] As the activated carbon precursor of this woody activated carbon, among the carbon sources usually used as raw materials for activated carbon, it is preferable to use wood powder, wood, by-products during pulp production, etc. Thereby, it is easy to obtain a woody activated carbon having a large mesopore volume, and it is easy to adsorb substances having a large molecular weight such as coloring components.

[0027] The activated carbon precursor may be a material that has been carbonized or insolubilized in advance by a conventional method. Carbonization treatment means a treatment that releases elements other than carbon by heat treatment to produce a solid with a high carbon content. Insolubilization treatment means a treatment that increases thermosetting properties by oxidative dehydrogenation cyclization, condensation, etc. so as to maintain a desired shape, and oxygen can be introduced into the activated carbon precursor and stabilized by cross-linking with oxygen.

[0028] The atmosphere for carbonization treatment is preferably, for example, a non-oxidizing gas atmosphere. For example, methods of heating using inert gases such as nitrogen, argon, xenon, neon, helium, carbon dioxide, carbon monoxide, combustion exhaust gas, and mixed gases of these inert gases and other gases having these inert gases as the main component can be mentioned.

[0029] Other conditions for carbonization treatment (such as heating rate) are not particularly limited and can be appropriately set according to the intended use and the like.

[0030] Examples of the method of infusibilization treatment include blowing hot air onto the activated carbon precursor.

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

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

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

[0034] Other conditions for infusibilization treatment (such as heating rate) are not particularly limited and can be appropriately set according to the intended use and the like.

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

[0036] As activation methods for activated carbon precursors, for example, gas activation methods, chemical activation methods, etc. can be mentioned. Among them, by chemical activation, the surface area can be increased, and activated carbon with a large mesopore volume can be obtained. Therefore, it is easy to adsorb and remove polymers such as coloring components in industrial applications. In addition, since the chemically activated activated carbon contains many functional groups containing oxygen atoms in particular, a higher adsorption effect can be exerted by coordinating with impurity metals.

[0037] When adopting the gas activation method, as the activation atmosphere, 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. can be adopted. Among them, since the reaction rate is faster, 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, and a mixed gas atmosphere of water vapor, carbon dioxide and nitrogen are preferable, and a water vapor gas atmosphere is more preferable. In addition, when adopting a mixed gas atmosphere, the flow rate ratio of each component can be about 10 to 90% by volume. Further, when using water vapor gas as the activation gas, the water vapor partial pressure is preferably 10 to 100% by volume, and more preferably 30 to 95% by volume. When adopting the gas activation method, the activation temperature is not particularly limited and can be set according to the desired performance (especially cracking of the molded body, adsorption performance, etc.). For example, 750 to 1200 °C is preferable, and 800 to 1100 °C is more preferable. By setting the activation temperature within this range, activated carbon having more appropriate performance (especially cracking of the molded body, adsorption performance, etc.) can be obtained.

[0038] When adopting the gas activation method, the activation time is not particularly limited either and can be set according to the desired performance (especially cracking of the molded body, adsorption performance, etc.). 30 to 300 minutes is preferable, and 90 to 200 minutes is more preferable. By setting the activation time within this range, activated carbon having more appropriate performance (especially cracking of the molded body, adsorption performance, etc.) can be obtained.

[0039]

[0040] ​In addition, examples of the activating agent when the chemical activation method is adopted include sodium hydroxide, potassium hydroxide, potassium carbonate, potassium sulfide, zinc chloride, phosphoric acid, etc. From the viewpoints of, particularly, cracking of the molded body, adsorption performance, etc., zinc chloride, phosphoric acid, etc. are preferable, and zinc chloride is more preferable.

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

[0042] When the chemical activation method is adopted, the activation time is also not particularly limited and can be set according to desired performance (particularly cracking of the molded body, adsorption performance, etc.). 10 to 300 minutes is preferable, and 20 to 200 minutes is more preferable. By setting the activation time within this range, activated carbon having more appropriate performance (particularly cracking of the molded body, adsorption performance, etc.) can be obtained.

[0043] After the activation treatment, if necessary, inorganic substances (ash content) in the carbon can be washed and deashed with dilute hydrochloric acid, an alkaline aqueous solution, etc., and further purified by repeating water washing, followed by drying and sieving.

[0044] 2. Powder activated carbon In the present invention, the powdered activated carbon is intended to improve the 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 viewpoints of being likely to suppress cracking of the activated carbon molded body and being likely to improve the moldability, the hardness of the activated carbon measured in accordance with JIS K1474 is preferably 90% or more, and more preferably 95% or more for this powdered activated carbon. Note that the greater the activated carbon hardness, the more preferable it is, and there is no particular upper limit, but it is usually 99.9% or less.

[0046] The activated carbon precursor of this powdered activated carbon is not particularly limited as long as it is a carbon source commonly used as a raw material for activated carbon. For example, plant raw materials other than wood such as coconut shells, bagasse, and molasses; fossil-based raw 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 resins, vinyl chloride resins, vinyl acetate resins, melamine resins, urea resins, resorcinol resins, celluloid, epoxy resins, polyurethane resins, polyester resins, acrylic resins, and polyamide resins; synthetic rubbers such as polybutylene, polybutadiene, and polychloroprene; synthetic wood; synthetic pulp, etc. can be mentioned. . Among these, from the viewpoint of low impurity content, plant raw materials are preferred. Among them, from the viewpoint of easily adsorbing polymers such as coloring components by manufacturing a molded body in combination with the above-mentioned woody activated carbon and being able to improve the moldability while suppressing cracking of the activated carbon molded body, coconut shells are preferred. These powdered activated carbons can be used alone or in combination of two or more.

[0047] The activated carbon precursor may be a material that has been carbonized or infusibilized in advance by a conventional method. Carbonization treatment means a treatment that releases elements other than carbon by heat treatment to produce a solid with a high carbon content. Infusibilization treatment means a treatment that increases thermosetting properties by oxidative dehydrogenation cyclization, condensation, etc. so that a desired shape can be maintained, and oxygen can be introduced into the activated carbon precursor to be stabilized by cross-linking with oxygen.

[0048] The atmosphere for carbonization treatment is preferably, for example, a non-oxidizing gas atmosphere. For example, methods of heating using inert gases such as nitrogen, argon, xenon, neon, helium, carbon dioxide, carbon monoxide, combustion exhaust gas, and mixed gases of these inert gases as the main component and other gases can be mentioned.

[0049] Other carbonization treatment conditions (heating rate, etc.) are not particularly limited and can be appropriately set according to the intended use, etc.

[0050] The method of infusibilization treatment includes, for example, blowing hot air onto the activated carbon precursor.

[0051] The atmosphere for infusibilization treatment is preferably an oxygen-containing atmosphere. For example, one or more of air, oxygen, ozone, nitrogen oxides (such as nitric oxide), sulfur dioxide, sulfurous acid, etc. can be mentioned.

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

[0053] The time for infusibilization treatment is not particularly limited, and from the perspective of production, 1 to 10 hours is preferable, and 1.5 to 6 hours is more preferable.

[0054] Regarding other conditions for infusibilization treatment (such as heating rate), there are no particular restrictions, and they can be appropriately set according to the intended use, etc.

[0055] As the method used for activating the activated carbon precursor, for example, known methods for manufacturing activated carbon such as fixed bed method, moving bed method, fluidized bed method, rotary kiln method, etc. can be mentioned.

[0056] As the activation method of the activated carbon precursor, for example, gas activation method, etc. can be mentioned. By gas activation, the strength of the obtained activated carbon molded body can be improved, cracks can be suppressed, and the moldability can also be improved.

[0057] When the gas activation method is adopted, as the activation atmosphere, for example, a steam gas atmosphere, a carbon dioxide gas atmosphere, a mixed gas atmosphere of steam and carbon dioxide, a mixed gas atmosphere of steam and / or carbon dioxide and nitrogen, etc. can be adopted. Among them, since the reaction rate is faster, an activation gas containing steam such as a steam gas atmosphere, a mixed gas atmosphere of steam and carbon dioxide, a mixed gas atmosphere of steam and nitrogen, a mixed gas atmosphere of steam, carbon dioxide and nitrogen, etc. is preferable, and a steam gas atmosphere is more preferable. When a mixed gas atmosphere is adopted, the flow rate ratio of each component can be about 10 to 90% by volume. When steam gas is used as the activation gas, the partial pressure of the steam is preferably 10 to 100% by volume, more preferably 30 to 95% by volume.

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

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

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

[0061] 3. Fibrous activated carbon Fibrous activated carbon means activated carbon having a fibrous shape.

[0062] The average fiber diameter of the fibrous activated carbon is preferably 3 to 50 μm, more preferably 5 to 30 μm, from the viewpoint of easily adsorbing polymers such as coloring components and easily suppressing cracking of the activated carbon molded body and improving moldability by producing a molded body in combination with the above-mentioned woody activated carbon. The average particle diameter of the fibrous activated carbon is measured by using a microscope to measure the fiber length and by the number distribution.

[0063] The average fiber length of the fibrous activated carbon is preferably 50 to 300 μm, more preferably 50 to 200 μm, from the viewpoint of easily adsorbing polymers such as coloring components and easily suppressing cracking of the activated carbon molded body and improving moldability by producing a molded body in combination with the above-mentioned woody activated carbon. The average particle length of the fibrous activated carbon is measured by using a microscope to measure the fiber length and by the number distribution.

[0064] As the fibrous activated carbon as described above, known or commercially available products can be used. These fibrous activated carbons can be used alone or in combination of two or more.

[0065] 4. Binder As the binder, a fiber binder is preferable from the viewpoint of easily adsorbing polymers such as coloring components and easily suppressing cracking and improving moldability by producing a molded body in combination with the above-mentioned woody activated carbon, powder activated carbon and / or fibrous activated carbon.

[0066] Such a fiber binder is preferably one that can entangle and shape the above-mentioned woody activated carbon, 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. As such a fiber binder, for example, organic fiber binders such as acrylic fiber, polyacrylonitrile fiber, and cellulose fiber can be particularly preferably mentioned. These binders can be used alone or in combination of two or more.

[0067] The water filtration degree of the binder is preferably 100 mL or less, more preferably 1 to 60 mL, from the viewpoints of easily adsorbing polymers such as coloring components by manufacturing a molded body in combination with the above-mentioned wood powder activated carbon and powdered active material and / or fibrous activated carbon, easily suppressing cracks in the activated carbon molded body, and easily improving moldability. The average particle diameter of the binder is measured using a Canadian standard water filtration degree tester conforming to JIS P8121.

[0068] 5. Activated carbon molded body The activated carbon molded body of the present invention contains 0 to 11.0% by mass of the above-mentioned binder, with the total amount being 100% by mass.

[0069] In industrial applications, from the viewpoints of easily adsorbing and removing polymers such as coloring components, easily suppressing cracks in the activated carbon molded body of the present invention, and easily improving moldability, the content of the woody 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, with the total amount of the activated carbon molded body being 100% by mass. In industrial applications, when attaching importance to easily adsorbing and removing polymers such as coloring components, the content is preferably 40 to 90% by mass (particularly 50 to 80% by mass) with the total amount of the activated carbon molded body being 100% by mass. When attaching importance to easily suppressing cracks in the activated carbon molded body of the present invention and easily improving moldability, the content is preferably 20 to 70% by mass (particularly 30 to 60% by mass) with the total amount of the activated carbon molded body being 100% by mass. When using two or more types of woody activated carbon, it is preferable to adjust so that the total amount is within the above range.

[0070] From the viewpoint that the content of powdered activated carbon and / or fibrous activated carbon makes it easy to adsorb and remove polymers such as coloring components in industrial applications, and also makes it easy to suppress cracking of the activated carbon molded body of the present invention and improve moldability, based on the total amount of the activated carbon molded body being 100% by mass, 10 to 80% by mass is preferable, 15 to 75% by mass is more preferable, and 20 to 70% by mass is even more preferable. In industrial applications, when importance is attached to the ease of adsorbing and removing polymers such as coloring components, based on the total amount of the activated carbon molded body being 100% by mass, 10 to 60% by mass (particularly 20 to 50% by mass) is preferable. When importance is attached to the ease of suppressing cracking of the activated carbon molded body of the present invention and improving moldability, based on the total amount of the activated carbon molded body being 100% by mass, 30 to 80% by mass (particularly 40 to 70% by mass) is preferable. When using two or more types of powdered activated carbon and / or fibrous activated carbon, it is preferable to adjust so that the total amount is within the above range.

[0071] When using a binder, the content of the binder is 0 to 11.0% by mass, preferably 0.1 to 10.5% by mass, more preferably 0.2 to 10.0% by mass based on the total amount of the activated carbon molded body being 100% by mass. When the content of the binder exceeds 11.0% by mass, in industrial applications, polymers such as adsorption components cannot be adsorbed and removed, and also cracking of the activated carbon molded body of the present invention cannot be suppressed, and moldability cannot be improved.

[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 cylindrical, tablet-shaped, honeycomb-shaped, sheet-shaped, etc. Among them, a cylindrical shape is preferable from the viewpoint of fitting with a general industrial filter housing.

[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 viewpoint that in industrial applications, it makes it easy to adsorb and remove polymers such as coloring components, and also makes it easy to suppress cracking of the activated carbon molded body of the present invention and improve 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 also less likely to crack, and has excellent moldability. Therefore, it can be used for purification, decolorization, extraction, etc. of functional foods; decolorization, purification, etc. of resin raw materials; purification, decolorization, etc. of food oils, industrial oils, etc.; purification, decolorization, etc. during sake brewing; purification, decolorization, etc. of functional resins. In particular, it is preferably used as a filter for treating liquids containing coloring components, etc.

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

[0076] The activated carbon slurry contains woody activated carbon, powdered activated carbon and / or fibrous activated carbon, and a binder, and can be slurried using a solvent such as water.

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

[0078] Note that the molding method is not limited to the above-described suction molding method, and a compression molding method using a press machine, an extrusion molding method of extruding and molding, etc. can also be adopted.

[0079] Also, at the time of molding, sink marks may occur on the end face portion, or minute cracks may occur on the end face portion. However, by installing a taper on the mold of the end face or changing the mold structure, it can be made less likely to crack.

Examples

[0080] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to the aspects of these examples.

[0081] In addition, the materials used in the following examples are as follows. Wood powder activated carbon (1): Powdered zinc chloride carbon (mesopore volume 84%, zinc chloride activation) manufactured by Osaka Gas Chemical Co., Ltd. Wood powder activated carbon (2): Powdered steam-activated carbon (mesopore volume 59%, steam activation) manufactured by Osaka Gas Chemical Co., Ltd. Coconut shell activated carbon (1): Coconut crushed carbon A manufactured by Osaka Gas Chemical Co., Ltd. (iodine adsorption amount 950 mg / g according to JIS K1474, activated carbon hardness 95% or more, steam activation) Coconut shell activated carbon (2): Coconut crushed carbon B manufactured by Osaka Gas Chemical Co., Ltd. (iodine adsorption amount 1,470 mg / g according to JIS K1474, activated carbon hardness 95% or more, steam activation) Coconut shell activated carbon (3): Coconut crushed activated carbon C manufactured by Osaka Gas Chemical Co., Ltd. (iodine adsorption amount 1,250 mg / g according to JIS K1474, activated carbon hardness 95% or more, steam activation) Wood granular carbon: Granular zinc chloride carbon (iodine adsorption amount 1,010 mg / g according to JIS K1474, activated carbon hardness 60% or less, zinc chloride activation) manufactured by Osaka Gas Chemical Co., Ltd. Fibrous activated carbon: Activated carbon fiber (average fiber diameter 10 - 20 μm, average fiber length 100 - 200 μm) manufactured by Osaka Gas Chemical Co., Ltd. Fiber binder (1): Bi-PUL50TWF manufactured by Toyobo Co., Ltd. (beaten product with an edible mixer; filtration degree about 47 - 60 mL according to JIS P8121) Fiber binder (2): Bi-PUL50TWF manufactured by Toyobo Co., Ltd. (beaten product with an industrial beater; filtration degree 47 mL or less according to JIS P8121).

[0082] Examples 1 to 5 and Comparative Examples 1 to 4 Wood powder activated carbon (1), coconut shell activated carbon (1) or (2), fiber binder (1) and, if necessary, fibrous activated carbon were melted in water as a solvent so that the activated carbon concentration became 1.5 kg / 50 L to obtain an activated carbon slurry so as to have 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 a cylindrical activated carbon molded body with a diameter of 60 mm and a thickness of 1.2 mm. In Table 1, "hand molding" in Examples 1 to 5 and Comparative Examples 1 to 4 means that suction molding was performed manually using a suction pump, and "automatic molding machine" in Example 5 means that suction molding was performed by operating the suction pump mechanically. After that, it was visually confirmed whether or not cracks had occurred on the appearance of the obtained activated carbon molded body. Those with cracks that could be visually confirmed even if they were minute were evaluated as "with cracks", and those with no cracks that could not be visually confirmed even for minute cracks of 10 mm or less were evaluated as "without cracks".

[0084]

[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 powder activated carbon (1) or (2), 20 parts by mass of coconut shell activated carbon (3), activated carbon fiber or woody granular carbon, and 10 parts by mass of fiber binder (2) were melted in water as a solvent so that the activated carbon concentration became 15 - 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 and suction molded, and then dried overnight at 110°C to obtain a cylindrical activated carbon molded body with a diameter of 61 mm and a thickness of 1.2 mm.

[0089] After that, those that could be molded to a diameter of about 60 mm or more during molding were evaluated as having moldability, and those that could only be molded to a diameter of less than about 60 mm were evaluated as having no moldability.

[0090] The results are shown in Table 2.

[0091] ​

Table 2

[0092] Example 5 and Comparative Examples 6 to 7 Wood powder activated carbon (1), coconut shell activated carbon (1) or (2), and fiber binder (1) were melted in water as a solvent so that the activated carbon concentration became 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, and suction molding was performed. Then, it was dried overnight at 110°C to obtain a cylindrical activated carbon molded body having a diameter of 61 mm and a thickness of 1.2 mm.

[0094] Using the obtained activated carbon molded body, a test solution obtained by diluting Higashimaru thick soy sauce 10-fold was circulated through a test piece for a filter having an outer diameter of 61 mm, an inner diameter of 30 mm, and a length of 24 mm at a rate of 175 cc / min using a liquid feed pump. After treatment for 120 hours, the absorbance at 460 nm was measured by UV-vis absorbance measurement of the test solution, and the removal rate was calculated from the absorbance before circulation. The results are shown in Table 3. The test solution 3 L was circulated through the test piece for the filter at a rate of 175 cc / min using a liquid feed pump. After treatment for 120 hours, the absorbance at 460 nm was measured by UV-vis absorbance measurement of the test solution, and the removal rate was calculated from the absorbance before circulation. The results are shown in Table 3.

[0095]

Table 3

Claims

1. The present invention relates to a method for producing an activated carbon material comprising the steps of: (a) extracting activated carbon particles from activated carbon particles; (b) extracting activated carbon particles from activated carbon particles; and (c) extracting activated carbon particles from activated carbon particles. The activated carbon molded body contains 0.1 to 11.0 mass % of a binder, with the total amount of the activated carbon molded body being 100 mass %.

2. 2. The activated carbon molded body according to claim 1, wherein the wood-based 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 wood activated carbon is wood powder activated carbon.

4. The activated carbon molded body according to any one of claims 1 to 3, wherein the activated wood carbon (1) is contained in an amount of 20 to 85 mass%, with the total amount of the activated carbon molded body being 100 mass%.

5. The activated carbon molded body according to any one of claims 1 to 4, wherein the powdered activated carbon (2) is coconut shell activated carbon.

6. The activated carbon molded body according to any one of claims 1 to 5, wherein the activated carbon powder (2) and / or fibrous activated carbon is contained in an amount of 10 to 75 mass%, based on 100 mass% of the total amount of the activated carbon molded body.

7. The activated carbon molded body according to any one of claims 1 to 6, wherein the binder is a fibrous binder.

8. The activated carbon molded body according to claim 7, wherein the fibrous binder is an organic fibrous binder.

9. The activated carbon molded body according to any one of claims 1 to 8, which is cylindrical.

10. The activated carbon molded body according to any one of claims 1 to 9, having a thickness of 1.0 to 20 mm.

11. A method for producing the activated carbon molded body according to any one of claims 1 to 10, A step of suction molding from an activated carbon slurry containing activated carbon powder and / or fibrous activated carbon other than activated carbon, and a binder, and containing 0.1 to 11.0% by mass of the binder, with the total amount of activated carbon and binder being 100% by mass. A manufacturing method comprising:

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