JP2009057239A - Activated carbon preparation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an activated carbon preparation method which can give an activated carbon having excellent properties such as adsorptivity and desorptivity by using a ground material prepared by drying a cellulosic or starchy activated carbon raw material and grinding the dried material to a controlled particle diameter. <P>SOLUTION: The activated carbon preparation method comprises the grinding step of preparing a ground material by drying a cellulosic or starchy activated carbon raw material and grinding the dried product so as to have a particle diameter of 0.1 mm or less, a molding step of forming a molding by mixing the ground material with an activating component and compression-molding the resulting mixture into a predetermined shape, the firing step of preparing a fired product by drying and firing the molding, and the grinding step of grinding the fired product. In some embodiments, the grinding in the step of grinding the activated carbon raw material is performed by crushing with a mortar, and the activating component in the molding step comprises zinc chloride. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing activated carbon.

  Activated carbon is excellent in selective adsorption performance and desorption performance. Water treatment, liquid purifier, chemical / pharmaceutical manufacturing, catalyst, etc. for liquid phase treatment, or deodorant, air purifier for gas phase treatment. It is used for various purposes such as. Such activated carbon is manufactured from waste such as wood, sawdust, coconut shell, charcoal, coal / petroleum and its residue, polymers, sludge, etc. Used in.

  Here, an example of a specific application of the activated carbon will be described. For example, the granular activated carbon is used for an automobile canister for the purpose of recovering the organic solvent vapor in the gas phase. Automobile fuel gasoline is highly volatile, and gasoline vapor is generated from the gasoline fuel tank while the car is running or stopped. This gasoline vapor is combined with oxygen and nitrogen compounds to change into harmful substances such as aldehydes, causing air pollution. Therefore, the gasoline vapor is adsorbed and the generation of gasoline vapor from the fuel tank is suppressed. For purposes, the canister is usually mounted between the fuel tank and the engine. The gasoline vapor adsorbed by the granular activated carbon is desorbed by the air entering from the intake port as the engine rotates, and the regenerated gasoline is burned by the engine.

  Therefore, the activated carbon used in the canister is required to have not only high adsorption performance for adsorbing organic solvent vapor such as gasoline vapor, but also high desorption performance for desorbing the adsorbed organic solvent vapor. . In addition, since the desorption of the organic solvent vapor is repeatedly performed, for example, a high B.V. value which is usually measured using n-butane. W. C. Activated carbon having (butane working capacity) is required. As such activated carbon, there has been proposed a method for producing a chemically activated activated carbon for obtaining a chemically activated activated carbon in a relatively short time by using an activation chemical having a low water content (for example, Patent Document 1). reference).

In this production method, a mixture of activated carbon raw material capable of chemical activation and an activation chemical having a moisture content of 25% by weight or less and an activation component content of 60% by weight or more is heated and reacted by a conventional method to form a reaction product, Next, the activated carbon is obtained by firing, washing and drying. In recent years, however, the canisters are required to be smaller and lighter due to space restrictions when mounted on automobiles. Accordingly, this type of activated carbon including the activated carbon for the canister is filled. An activated carbon having a high density and higher adsorption performance and desorption performance per volume is desired.
Japanese Patent Laid-Open No. 7-138010

  By the way, in the case of using activated carbon raw materials such as sawdust and corn when using activated carbon raw materials such as sawdust and corn, these activated carbon raw materials are used due to problems in the manufacturing process or costs. The actual condition is that the pretreatment is not carried out to highly control the particle size and the like. However, as a result of extensive research conducted by the inventor, in particular, by producing activated carbon using a pulverized material obtained by drying and pulverizing the activated carbon raw material to a predetermined particle size, the adsorption performance and The inventors have found that activated carbon having high desorption performance can be obtained.

  This invention has been made in view of the above points, and by using a pulverized material in which the cellulosic or starchy activated carbon raw material is pulverized after drying and the particle size is highly controlled, adsorption performance, desorption performance, etc. The present invention provides a method for producing activated carbon that can obtain activated carbon having excellent characteristics.

  That is, the invention according to claim 1 is a mixture of a pulverizing step of drying a cellulosic or starchy activated carbon raw material to obtain a pulverized material by pulverization to a particle size of 0.1 mm or less, and the pulverized material and an activating component. An activated carbon comprising: a molding step for compression molding into a predetermined shape to obtain a molded product; a firing step for drying and firing the molded product to obtain a fired product; and a pulverizing step for pulverizing the fired product. Related to manufacturing method.

  Invention of Claim 2 concerns on the manufacturing method of the activated carbon of Claim 1 with which the grinding | pulverization in the grinding | pulverization process of the said activated carbon raw material is made | formed by grinding with a die.

  Invention of Claim 3 concerns on the manufacturing method of the activated carbon of Claim 1 or 2 in which the activation component in the said formation process consists of zinc chloride.

  Invention of Claim 4 concerns on the manufacturing method of the activated carbon of any one of Claim 1 thru | or 3 with which shaping | molding in the said shaping | molding process is made with a briquette machine.

  The invention of claim 5 relates to the method for producing activated carbon according to any one of claims 1 to 4, wherein the pulverization in the pulverization step of the fired product is pulverized to a particle size of 0.50 to 2.36 mm.

  According to the method for producing activated carbon according to the invention of claim 1, a pulverizing step of drying a cellulosic or starchy activated carbon raw material and pulverizing it to a particle size of 0.1 mm or less to obtain a pulverized material; Are formed by a molding step of mixing and compression molding into a predetermined shape to obtain a molded product, a firing step of drying and firing the molded product to obtain a fired product, and a pulverizing step of pulverizing the fired product. In addition to being able to be manufactured, it is possible to obtain activated carbon having characteristics excellent in adsorption performance and desorption performance.

  According to the invention of claim 2, in claim 1, since the pulverization in the pulverization step of the activated carbon raw material is performed by grinding with a mortar, activated carbon having higher adsorption performance and desorption performance can be obtained.

  According to the invention of claim 3, in claim 1 or 2, since the activation component in the molding step is made of zinc chloride, the yield of activated carbon is high and compression molding is easy to perform.

  According to the invention of claim 4, in any one of claims 1 to 3, since the molding in the molding step is performed by a briquette machine, the molding can be performed continuously and efficiently.

  According to the invention of claim 5, in any one of claims 1 to 4, since the pulverization in the pulverization step of the baked product is pulverized to a particle size of 0.50 to 2.36 mm, activated carbon is used as the adsorption / desorption material. The size is suitable for use.

  The manufacturing method of the activated carbon P of the present invention, as understood from FIG. 1, is a pulverization step S1 for drying the cellulosic or starchy activated carbon raw material M and pulverizing it to a particle size of 0.1 mm or less to obtain a pulverized material S; The pulverized material S and the activating component are mixed and compression molded into a predetermined shape to obtain a molded product S2; the molded product is dried and fired to obtain a fired product S3; and the fired product It comprises a pulverization step S4 for pulverization. Hereinafter, each process is explained in full detail.

  In the step of obtaining the pulverized material, that is, the pulverizing step S1, first, the cellulosic or starchy activated carbon raw material M is dried. Examples of the cellulosic activated carbon material include sawdust, waste wood, wood chip, wood dust, coconut shell, and waste bamboo. Examples of the starchy activated carbon raw material include millet, corn, millet, and millet. Since these activated carbon raw materials have a water content of about 50 wt%, for example, if they are sawdust, they are dried in advance so that they can be easily handled and pulverized easily in the pulverization step described below. The drying conditions of the activated carbon raw material are not particularly limited, but in order to perform pulverization more effectively and efficiently, the water content of the activated carbon raw material M after drying in the pulverization step S1 is desirably 5 wt% or less. For example, when the drying method is performed in a rotary kiln or the like, it is performed by exposing it to an air current of about 200 to 300 ° C. for several seconds to several tens of seconds.

  The activated carbon raw material dried as described above is pulverized to a particle size of 0.1 mm or less to obtain a pulverized material S. The activated carbon raw material is pulverized by a known pulverizer such as a ball mill, a roller mill, or a disk cutter. Then, the pulverized activated carbon raw material is classified to a particle size of 0.1 mm or less by a classifier, a sieve, or the like to obtain a pulverized material S in FIG. For example, when a sieve is used, in order to obtain a pulverized material having a target particle size, the sieve is prepared according to the size of the sieve opening. Specifically, when sieving is performed using a sieve having an opening of 0.1 mm, a pulverized material having a particle size of 0.1 mm or less is obtained. Thus, when the particle size of the pulverized material is 0.1 mm or less, it is easy to mix with an activation component described later, and activation and activation are facilitated. On the other hand, when the particle size of the pulverized material is larger than 0.1 mm, it is difficult to uniformly mix with the activating component and the activated material is not sufficiently activated, and it is difficult to obtain activated carbon having desired characteristics.

  In particular, the activated carbon raw material is preferably pulverized by grinding with a mortar. When pulverized by a mortar, the activated carbon raw material can be crushed while being pressed, and the pores derived from the plant tissue peculiar to cellulosic or starchy activated carbon raw material can be easily crushed while pulverizing, and the packing density tends to increase. Activated carbon having excellent adsorption capacity and desorption capacity can be obtained. In addition, for this grinding with a mortar, a known stone mortar type grinder is used.

  Next, in the molding step S2, the pulverized material S obtained in the pulverization step S1 is compression molded into a predetermined shape after mixing with the activating component to obtain a molded product. The activation component is not particularly limited as long as it is a component having an activation activity with respect to the activated carbon raw material, such as alkali metal (Li, Na, K, etc.) and calcium chloride, caustic soda, phosphoric acid, zinc chloride and the like. Examples thereof include chlorides, hydroxides, sulfates, nitrates, phosphates, carbonates of alkaline earth metals (Be, Mg, Ca, Sr, etc.). As the activating component, one or a mixture of two or more of these compounds can be used. In general, as a method of activating activated carbon, there may be a case where steam activation is performed in addition to the case where chemical activation is performed using an activating component as in the present invention. Tend to be higher.

  Especially, since the activated carbon of the outstanding characteristic is obtained, it is preferable that the activation component in the said formation process S2 consists of zinc chloride. When zinc chloride is used as the activating component, mixing and compression molding are relatively easy when mixing with the pulverized material and water. At this time, if the main component is zinc chloride, other compounds as described above may be contained. The pulverized material and the activation component are mixed using a known stirrer or the like, and the pulverized material is impregnated with the activation component. The activating component is usually used as an aqueous solution or the like, and its concentration, amount of use, etc. are appropriately adjusted according to the activated carbon raw material, pulverized material, type of activating component, and the like.

  In addition, when mixing the pulverized material, the activation component, and water, the amount of water is appropriately selected as desired. When a lump or the like is partially generated during mixing of the pulverized material, the activation component, and water, stirring may be performed with a cutter-type pulverizer or the like so that the following compression molding can be easily performed. Good. In addition, a binder or the like may be added during the mixing. Examples of the binder include coal tar, anhydrous tar, soft pitch, hard pitch, creosote oil, wood tar, wood tar oil, wood tar pitch, sodium lignin sulfonate, bentonite and the like.

  The mixture obtained as described above is compression molded by a known molding method such as press molding, extrusion molding, or disk pelleter to obtain a molded product. As the molding method, it is desirable that compression molding is performed by a briquette machine. The briquette machine has a large processing capacity as compared with other molding methods and can perform continuous and efficient compression molding, which is advantageous in terms of cost. About the compression molding of the said mixture, according to the use of activated carbon, it shape-molds by compression-molding to predetermined shapes, such as plate shape, pellet shape, briquette shape, tablet shape, spherical shape, cylindrical shape, lump shape, fiber shape.

  Thus, the molded product obtained in the molding step S2 is dried and fired in the firing step S3. The molded product contains a certain amount of moisture for convenience of molding, but if it contains excessive moisture, the molded body will expand due to rapid temperature rise, making it difficult to operate the furnace. In order to reduce the moisture content of the molded product, it is dried before firing. In addition, when activated carbon raw materials, such as sawdust, are used at the time of drying, the tar content is melted and the binder effect is exhibited.

  The drying conditions during the drying are not particularly limited, and the drying is performed in a temperature range of 100 to 250 ° C. In addition, when the drying temperature exceeds 300 ° C., the cellulosic or starchy activated carbon raw material starts to exothermically decompose, so that the above range is preferable. In addition, when the molded product is suddenly heated from room temperature at a high temperature, gas such as moisture and volatile organic compounds contained in the activated carbon raw material is generated and the molded product expands. The temperature may be raised.

  Next, the dried molded product is fired and carbonized to obtain a fired product. For the firing, a known heating / firing means such as a rotary kiln, tunnel kiln, electric furnace or the like is used. The molded product is fired and carbonized at 400 to 600 ° C. The above-described drying may be performed collectively in a single furnace with firing (carbonization). In this case, a rotary kiln or the like that can easily perform temperature control is used. After calcination, the baked product is thoroughly washed with hydrochloric acid or the like as a post-treatment and appropriately heat-treated and dried.

  The fired product is pulverized into activated carbon P in the pulverization step S4. The pulverization method is performed by a known pulverizer such as the pulverizer and roll crusher described above. Moreover, in order to improve a packing density, a rolling process may be performed using a mixer etc. as needed. The degree of pulverization is appropriately adjusted according to the application, and when used as an adsorbent / desorbent, the activated carbon preferably has a particle size of 0.50 to 2.36 mm. The activated carbon having a desired particle size is prepared by classification with a sieve or the like as described above.

  According to the method for producing activated carbon according to the present invention described above, after the cellulosic or starchy activated carbon raw material is dried, the activated carbon is produced after pulverizing to a particle size of 0.1 mm or less to obtain a pulverized material. Activated carbon having excellent adsorption / desorption performance can be obtained, and can be used for various applications such as adsorption / desorption of various gases and decolorization purification of liquids.

Next, examples of activated carbon obtained by the method for producing activated carbon of the present invention will be described.
[Example 1]
First, sawdust (using North American pine) was used as the activated carbon material. The sawdust was dried at 105 ° C. for about 18 hours with a thermostat. The dried sawdust was pulverized while being ground using a stone mill grinder (manufactured by Masuko Sangyo Co., Ltd., “Supermass colloider MKZA 15-30”). In addition, the material of the grindstone in the said stone mill type grinding crusher was silicon carbide, and it grind | pulverized narrowing the space | interval of a grindstone and a grindstone as much as possible.

  After the pulverization, a pulverized material having a particle size of 0.1 mm or less was obtained using a sieve having an opening of 0.1 mm by a tap classifier. Further, when the average particle size (μm) of the pulverized material was measured using a particle size distribution measuring device (manufactured by Shimadzu Corporation, “SALD-200V”), the average particle size was 34.8 μm. It was. In Table 1, conditions for each step such as drying and firing of activated carbon described below and conditions for other examples and comparative examples to be described later are collectively shown.

  Next, the pulverized material, the activation component zinc chloride and water were mixed. The blending ratio of zinc chloride and water at this time was adjusted so as to have the contents shown in Table 2 below. That is, with respect to 100 parts by weight of sawdust, zinc chloride was added in a solid content of 220 parts by weight, and water was added to be 30 parts by weight with respect to 100 parts by weight of sawdust. At this time, when water or zinc chloride was added to the sawdust, a lump was formed. After stirring for about 10 seconds with a cutter type pulverizer, the mixture was left as it was for a whole day and night (about 24 hours). In addition, the compounding ratio (part by weight) of zinc chloride in Table 2 shows the value converted into the solid content in the same manner for other examples and comparative examples described later.

  As described above, the mixture obtained by adding water and zinc chloride to the pulverized material was subjected to compression molding using a briquette machine (briquetter type granulator) to obtain a pellet-shaped molded product. As shown in Table 1 above, the molded product was dried at 120 ° C. for 2 hours and then at 150 ° C. for 16 hours. Then, the molded product after drying was placed in a crucible and baked. The firing conditions at this time were as follows: the temperature was raised to 100 ° C. in 10 minutes; Obtained.

  Subsequently, the fired product is pulverized by a roll crusher whose gap between rolls is adjusted to about 10 mm, and then sufficiently washed with hydrochloric acid and dried, and a sieve having an opening of 0.5 to 2.36 mm is used. Thus, activated carbon of Example 1 having a particle size of 0.5 to 2.36 mm was obtained.

[Example 2]
About the grinding | pulverization of the raw material activated carbon of Example 1, about half-hour grinding | pulverization is carried out for about 30 seconds using a cutter type grinder (Osaka Chemical Co., Ltd. “Wonder Blender WB-1”) about half of the sawdust in a 150 ml container. The activated carbon of Example 2 was obtained in the same manner as Example 1 except that it was performed.

[Example 3]
In Example 2, the activated carbon of Example 3 was obtained in the same manner as in Example 2 except that the drying condition of the molded product was maintained at 150 ° C. for 18 hours.

[Comparative Example 1]
In Example 3, Comparative Example 1 was prepared by the same production method as Example 3 except that a pulverized material having a particle size of 0.15 mm or less was obtained using a sieve having a mesh size of 0.15 mm by a tap type classifier. Of activated carbon was obtained.

[Comparative Example 2]
As the activated carbon raw material, sawdust (using North American pine) was used in the same manner as in Example 1. The sawdust is dried at 105 ° C. for about 18 hours in a thermostat and then pulverized, and activated carbon having a particle size of 0.25 mm or less using a sieve with a mesh opening of 0.25 mm by a tap classifier. The raw material was obtained.

  Zinc chloride and water were mixed with the activated carbon raw material classified as described above. The blend of zinc chloride and water at this time was prepared so as to have the contents shown in Table 2 above. At this time, when water or zinc chloride was added to the sawdust, a lump was formed. After stirring for about 10 seconds with a cutter type pulverizer, the mixture was left as it was for a whole day and night (about 24 hours). The mixture obtained by adding water and zinc chloride to the pulverized material was compression molded using a briquette machine (briquetter type granulator) to obtain a pellet-shaped molded product.

  As shown in Table 1 above, the molded product was dried by holding at 160 ° C. for 18 hours. Then, the molded product after drying was placed in a crucible and baked. The firing conditions at this time were as follows: the temperature was raised to 100 ° C. in 10 minutes; Obtained. Thereafter, in the same manner as in Example 1, the fired product was pulverized, classified using a sieve having an opening of 0.5 to 2.36 mm, and the activated carbon of Comparative Example 2 having a particle size of 0.5 to 2.36 mm. Got.

[Comparative Example 3]
In Comparative Example 2, the mixing ratio of classified sawdust, zinc chloride, and water is 220 parts by weight of zinc chloride and 15 parts by weight of water with respect to 100 parts by weight of sawdust as shown in Table 2 above. The activated carbon of Comparative Example 3 was obtained in the same manner as in Comparative Example 2 except that the compression molding method was compression molded into a pellet using a disk pelleter, and that pulverization was not performed after firing. .

  Subsequently, for each of the activated carbons of Examples 1 to 3 and Comparative Examples 1 to 3 produced as described above, the packing density (g / mL), B.I. W. C. (Butane working capacity, butane adsorption performance) (g / 100 mL) and butane residual ratio (%) were measured. Hereinafter, the measurement method will be described.

[B. W. C. Measuring method]
B. W. C. In the measurement of (butane adsorption performance), the measurement was performed by the following method using the activated carbons of the respective Examples and Comparative Examples. A description will be given using the conceptual diagram of the measuring apparatus shown in FIG.
(1) First, each activated carbon is dried at a drying temperature of 110 ± 5 ° C. in a constant temperature machine for 3 hours.
(2) The cylindrical adsorption tube 13 having an outer diameter of 19 mm and an inner diameter of 17 mm and a stopper (not shown) capable of sealing the adsorption tube are weighed, and the weight at this time is defined as W ₀ (g). .
(3) The activated carbon obtained in the above (1) is filled into the adsorption tube 13 using an electromagnetic feeder so as to have a predetermined filling volume V (mL) at a filling speed of 0.75 to 1.00 mL / s. To do. In this measurement method, the filling volume V of activated carbon was 18.3 mL.
(4) The adsorption tube 13 filled with activated carbon M is weighed together with the stopper. The weight at this time is W ₁ (g).
(5) A copper heat exchanger H (outer diameter 8 mm—inner diameter 6 mm) is immersed in a constant temperature water tank 15 containing water W at a temperature of 25 ± 1 ° C.
(6) The adsorption tube 13 is immersed in the constant temperature water tank 15 so that the water surface is higher than the upper surface of the activated carbon M filled therein.

(7) A pipe whose flow rate of n-butane B (purity 99% or more) is adjusted to 250 mg / min with the flow meter 12 is connected to one side of the heat exchanger H, and the other is connected to the inside of the adsorption pipe 13 with n. -Connected to the adsorption tube 13 so that butane B flows upward, and allowed to stand for 15 minutes to allow the activated carbon M to adsorb n-butane B.
(8) Then, the adsorption tube 13 is gently taken out from the constant temperature water tank 15 so that the activated carbon M in the adsorption tube 13 is not moved, and a stopper is quickly attached.
(9) Remove the water adhering to the adsorption tube 13 and weigh the adsorption tube 13 with the stopper attached. Incidentally, the weight obtained at this time and the post-adsorption weight W ₂₁ (g).

(10) Next, the adsorption tube 13 filled with activated carbon M on which n-butane has been adsorbed in (8) above is immersed in the constant temperature water tank 15 so that the water surface is higher than the upper surface of the activated carbon M layer, and the stopper is removed. In FIG. 2, for the sake of convenience of explanation, the adsorption pipe 13 ′ and activated carbon M ′ shown on the right side will be described separately.
(11) Connect the pipe adjusted so that the flow rate of the dry air A becomes 183 mL / min with the flow meter 12, and connect the other to the activated carbon M ′ layer of the adsorbed adsorption pipe 13 ′. It connects so that dry air A may flow downward, and is ventilated and left still for 20 minutes to desorb n-butane B adsorbed on the activated carbon M ′.
(12) Take out the adsorption tube 13 ′ from the thermostatic water tank 15 and quickly attach a stopper so as not to disturb the activated carbon M ′ in the adsorption tube 13 ′ after n-butane desorption.
(13) Then, the water adhering to the adsorption tube 13 ′ is removed and weighed with the stopper attached. The weight obtained at this time is defined as a weight W ₃₁ (g) after desorption.

After finishing the above operations (1) to (13), the procedures from (6) to (13) are repeated three times in the same manner, and the weight after adsorption at each number of times (same as (4) above) , The weight of the adsorption tube 13 filled with activated carbon M after adsorption of n-butane B) and the weight after desorption (similar to the above (13), after n-butane B is desorbed from activated carbon M ′ after adsorption) The weight of the adsorption tube 13 ′ is measured. The weight after adsorption in the second measurement is W ₂₂ (g), the weight after adsorption in the third measurement is W ₂₃ (g), and the weight after adsorption in the fourth measurement is W ₂₄ (g). The weight after desorption in the second measurement is W ₃₂ (g), the weight after desorption in the third measurement is W ₃₃ (g), and the weight after desorption in the fourth measurement is W ₃₄ (g). To do.

The thus obtained post-adsorption weights W ₂₁ , W ₂₂ , W ₂₃ , W ₂₄ (g), post-desorption weights W ₃₁ , W ₃₂ , W ₃₃ , W ₃₄ (g) and the activated carbon filling thus obtained. Using the volume V (mL), B. W. C. The value of (g / 100 mL) was determined.

[Packing density]
The packing density (g / mL) is the same as that described in B. W. C. The activated carbon filling volume V (mL) in the measuring method (3), the weight W ₁ (g) of the adsorption tube and stopper filled with activated carbon in the measuring method (4), and the activated carbon measured in (2) are filled. by weight W ₀ of the previous suction tube and stopper (g), it was determined using the following equation 2.

[Butane remaining rate]
Further, the butane residual rate (%) is the same as that described in B.1. W. C. From the weight W ₂₁ (g) after adsorption obtained by the measurement method (9), the weight W ₃₁ (g) after desorption according to (13) and the packing density determined by the above formula 2, the following formula 3 is used. Asked.
The values obtained by each measurement performed as described above are shown in Table 3 below.

  As is apparent from Table 3 above, the B.V. W. C. The values of these are clearly larger than those of Comparative Examples 1 to 3, and B. W. C. Showed the highest value. Furthermore, the activated carbon of Example 1 has a very low butane residual rate, and even if Example 1 and Example 2 in which the packing density is approximately the same are compared, the activated carbon of Example 1 has a very low butane residual rate. The adsorption / desorption performance was particularly excellent. In the activated carbons of Example 1 and Example 2, the manufacturing conditions differ only in the pulverization method in the pulverization step, and the activated carbon of Example 1 is obtained by pulverization in the pulverization step by grinding with a mortar. From this, it was confirmed that in the pulverization step of the activated carbon raw material, the adsorption and desorption performance of the activated carbon was significantly improved by performing pulverization, particularly by grinding with a mortar.

  In addition, the activated carbon of an Example has comparatively high packing density including Example 1, and the packing density of Example 1 and Example 2 became higher than Example 3 among them. In Example 2 and Example 3, there is a difference in the drying conditions of the molded product. In Example 1, the temperature was raised stepwise and dried, whereas in Example 3, it was suddenly dried at 150 ° C. It is presumed that the expansion of the molded product due to the generation of gas such as that influenced the packing density of the activated carbon.

It is a schematic process drawing which shows an example of the manufacturing method of activated carbon of this invention. B. W. C. It is a conceptual diagram of a measuring device.

Explanation of symbols

M Activated carbon raw material S Grinding material P Activated carbon

Claims (5)

A crushing step of drying a cellulosic or starchy activated carbon raw material and crushing to a particle size of 0.1 mm or less to obtain a pulverized material;
A molding step of mixing the pulverized material and the activation component and compression molding into a predetermined shape to obtain a molded product,
A firing step of drying and firing the molded product to obtain a fired product;
A method for producing activated carbon, comprising a pulverization step of pulverizing the fired product.   The method for producing activated carbon according to claim 1, wherein the pulverization of the activated carbon raw material in the pulverization step is performed by grinding with a mortar.   The method for producing activated carbon according to claim 1 or 2, wherein the activating component in the molding step comprises zinc chloride.   The method for producing activated carbon according to any one of claims 1 to 3, wherein the molding in the molding step is performed by a briquette machine.   The method for producing activated carbon according to any one of claims 1 to 4, wherein pulverization in the pulverization step of the fired product is pulverized to a particle size of 0.50 to 2.36 mm.

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