JP3310348B2 - Method for producing molecular sieve carbon - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing molecular sieve carbon used in gas separation techniques such as air separation by PSA method, hydrogen purification from off-gas and the like, and separation of methane from fermentation gas. .

[0002]

2. Description of the Related Art In recent years, technology for separating and purifying specific components from various mixed gases has been actively developed. Above all, the technique called PSA is expected to be developed for many applications because the apparatus is compact and the running cost is low. In particular, air separation that separates and recovers nitrogen from air using hydrophobic molecular sieve carbon,
Rapid market expansion is expected. The characteristic of molecular sieve carbon is that ordinary activated carbon has micropores of 10 to 30 °, whereas micropores of 3 to 5 ° are small and have a narrow distribution of micropores. Various methods have been proposed for producing molecular sieved carbon. Among them, there is a pyrolytic carbon vapor deposition method.

[0003] In this pyrolytic carbon deposition method, a carbonaceous substrate and a hydrocarbon gas are brought into contact with each other at a high temperature, and pyrolytic carbon released from the hydrocarbon is deposited near the entrance of a micropore of the carbonaceous substrate. This is a method for adjusting the micropores of a carbonaceous substrate, and there have been various proposals regarding this method.

In Japanese Patent Publication No. 52-18675, coke containing a small amount of volatile components is used as a carbonaceous substrate, and hydrocarbons which release carbon by thermal decomposition (for example, benzene, toluene, ethane, hexane, methanol Such)
Is added and treated at a temperature of 600 to 900 ° C. for 1 to 60 minutes or more, thereby depositing the released carbon in the pores of the course to obtain about 4 ° C.
The preparation of carbon-containing molecular sieves for use in the separation of gases having the following small molecular dimensions has been proposed.

This proposal is epoch-making and highly evaluated in that it is the first to propose a method for producing a carbon molecule sieve for separating small molecules. However, in order to obtain a high-quality carbon molecule sieve with excellent reproducibility. Further improvement is needed.

[0006] In the specification of Japanese Patent Publication No. 1-502743, a dry distillate having a small amount of volatile components is used in an amount of 800-900.
At a temperature of 5 ° C. for 5 to 30 minutes into a vibrating furnace supplied with an inert gas having a water vapor concentration of 20 to 95% by volume in countercurrent, weakly activated and Disclosed is a method for producing a molecular sieve having excellent uniformity of oxygen and nitrogen by introducing it into a vibrating furnace supplied with an inert gas having a benzene concentration of 12% by volume.

[0007] This proposal is excellent in that a product of more uniform quality can be obtained. However, since it is a method of contacting in countercurrent, the process is slightly complicated, and depending on the carbonized material used, high-quality products are obtained. Things may not be available.

Another proposal is disclosed in Japanese Patent Application Laid-Open No. Sho 60-17121.
In the specification of No. 2, (i) high temperature (800 to 900 ° C.)
(Ii) cooling the degassed carbon base material to a temperature of 300 to 500 ° C., bringing the carbon base material into contact with a gaseous hydrocarbon, and adsorbing the hydrocarbon inside. (Iii) degassing the adsorbed carbon substrate under reduced pressure to remove physically retained hydrocarbons, and (iv) removing the hydrocarbons fixed in the pores of the carbon substrate at a high temperature (800 to 90
0 ° C.) to deposit carbon in the pores, and a method for producing molecular sieve carbon comprising a combination of the above steps (i) to (iv). Disclosure is made on the case where propylene is used as hydrogen, and from the minimum dimension of propylene, 0.5 to 0.55 nm
It is said that it is most suitable for treating a carbon substrate having pores of (5 to 5.5 °).

According to this proposal, pyrolytic carbon is deposited only at the opening of the carbon base material, and molecular sieve carbon having a controlled pore structure can be produced. However, the production process as a whole is complicated and complicated. Become.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide an improved method for producing molecular sieve carbon by such a pyrolytic carbon vapor deposition method. More specifically, an object of the present invention is to provide a method for easily, inexpensively, and reproducibly producing high-performance molecular sieve carbon.

[0011]

Means for Solving the Problems The present inventors have conducted intensive studies on the relationship between the micropore diameter of a carbonaceous substrate and the type of hydrocarbons that are the source of pyrolytic carbon, using pitch as a starting material. When a carbonaceous substrate having an average micropore diameter of 5.5 to 12 ° is used and an aromatic hydrocarbon or an alicyclic hydrocarbon is used as a hydrocarbon, a high-performance molecular sieve carbon can be reproducibly obtained by a very simple process with good reproducibility. They have found that they can be manufactured, and have completed the present invention.

That is, according to the present invention, the softening point 150
Optically isotropic pitch of ℃ or more and ash content of 5000 ppm or less
A carbonaceous substrate having an average micropore diameter of 5.5 to 12 °, which is produced from a raw material containing, in a treatment furnace heated to 650 to 850 ° C., contains an aromatic hydrocarbon and / or an alicyclic hydrocarbon. A method for producing molecular sieve carbon is provided, wherein pyrolytic carbon is deposited in micropores by supplying an inert gas.

[0013]

Further , the softening point is 150 ° C. or more and the ash content is 5000
The optically isotropic pitch of not more than ppm is pulverized or made into fibers, infusibilized and then molded, and further subjected to an activation treatment in an inert gas atmosphere containing carbon dioxide gas and / or water vapor to give a specific surface area of 300 to It is preferable to use 1000 m ² / g of porous carbon, which is used as the carbonaceous substrate.

Further, it is preferable that, after the completion of the above-mentioned vapor deposition processing, the temperature be kept at a temperature not lower than the vapor deposition processing temperature and not higher than 1100 ° C. in an inert gas atmosphere.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the configuration of the present invention will be described in detail, but more preferable embodiments and advantages based thereon will become obvious.

Carbonaceous Substrate The carbonaceous substrate used in the present invention has an average micropore diameter of 5.5.
Å12 範 囲, preferably 5.5Å9Å, particularly 5.5Å8Å. When the distribution of the micropore diameter of the carbonaceous substrate is narrow, the distribution of the micropore diameter of the obtained molecular sieve carbon is also narrow, and a favorable result is obtained. Average micropore diameter of 5.5
In the case of a carbonaceous substrate of less than Å, the rate at which the micropore diameter narrows (change over time in the micropore diameter) is too fast when performing vapor deposition treatment with carbon generated by the thermal decomposition of aromatic hydrocarbons.
It is difficult to control the diameter of the micropores, which is not appropriate. On the other hand, if the average diameter exceeds 12 °, the micropores themselves are likely to be closed during the vapor deposition process, which is not appropriate.

In the present invention, the term “micropore” refers to 20 micropores.
細孔 The following pores are shown. Further, the average micropore diameter means a 50% average diameter of the micropore volume in the distribution curve of the micropore diameter. A carbonaceous substrate having an average micropore diameter in the range of 5.5 to 12 ° can be obtained very easily by using a coal-based or petroleum-based pitch as a starting material according to the method described in detail below.

Hereinafter, a method for obtaining a carbonaceous substrate will be described. Softening point is 150 ° C. or higher, preferably 150 to 250
℃, ash content is less than 5000ppm, preferably 500p
An optically isotropic pitch of pm or less is mechanically pulverized into fine powder. Alternatively, an optically isotropic pitch is heated and melt-spun into a fibrous form.

A pitch having a softening point of 150 ° C. or less is not suitable as a starting material because it requires a long time for infusibility. The pitch having an ash content of 5000 ppm or more is used as a starting material in view of the fact that the ash content acts as a catalyst, so that the activation reaction described later runs away or the average micropore diameter of the obtained carbonaceous base material easily exceeds 12 mm. not appropriate. The fine pitch or fibrous pitch is heated to 300 ° C. in an oxidizing atmosphere such as air to make it infusible.

The infusible fine powder or fibrous material is mixed with a binder and molded. Here, the binder has a function of binding the fine powder or fibrous material to each other to maintain a molded shape, and has a softening point of 80.
A pitch of about 120 ° C., a phenol resin, a furan resin, an epoxy resin and the like can be exemplified. The proportion of the binder used is preferably 2 parts by weight or more and 30 parts by weight or less based on 100 parts by weight of the infusible fine powder and fibrous material as the residual carbon content. If the amount is more than 30 parts by weight, the activation treatment becomes difficult, and the pore distribution is widened, which is not preferable as a raw material of molecular sieve carbon. When the amount is less than 2 parts by weight, the effect as the binder is not exhibited.

By this molding step, the infusible material in the form of fine powder is formed into granules by an extrusion granulation method or a tumbling granulation method. The fibrous infusibilized material is formed into granules in the same manner as in the case of fine powder, and is formed into paper by wet papermaking or felt by needle punching.

This molded article is then subjected to an activation treatment. In the activation treatment, carbon crystals constituting the carbon material (activation raw material) or carbon constituting minute pores are reacted and consumed, and pores are complexly and systematically formed by the carbon structure.
The specific surface area increases.

The activation treatment is carried out at a temperature of 800 to 1100 ° C. in a carbon dioxide gas atmosphere or an inert gas atmosphere such as a nitrogen gas containing carbon dioxide gas and / or water vapor at a temperature of 0 to 4 ° C.
It is performed by leaving it for 80 minutes. Before the activation treatment, 500 to 1 in an inert gas atmosphere such as nitrogen gas.
Carbonization may be performed at a temperature of 500 ° C.

In this activation treatment, the specific surface area of the treated product is 30
By controlling the treatment temperature and time so as to be 0 to 1000 m ² / g, a carbonaceous substrate having an average micropore diameter in the range of 5.5 to 12 ° can be easily produced. With this level of activation, the activation yield (the ratio of the weight of the activated material to the weight of the finely powdered or fibrous material) is as high as 50 to 70%, and molecular sieve carbon can be obtained at low cost.

Hydrocarbon An aromatic hydrocarbon or an alicyclic hydrocarbon is used as a hydrocarbon serving as a carbon source in the pyrolytic carbon vapor deposition method of the present invention. As aromatic hydrocarbons, benzene, toluene,
Alkylbenzenes such as ethylbenzene and xylene, other naphthalenes and methylnaphthalenes, and alicyclic hydrocarbons such as cyclohexane can be exemplified. Generally, those having about 1 to 2 carbon rings are preferable.

In the present invention, first, the above-mentioned carbonaceous substrate is subjected to 650 to 850 ° C., preferably 700 to 800 ° C. in an inert gas atmosphere.
Heat to ° C. This heating may be performed in a processing furnace described later, or may be performed in another furnace, and the heated carbonaceous substrate may be continuously supplied to the processing furnace.

The vapor deposition is performed in a processing furnace heated to 650 to 850 ° C., preferably 700 to 750 ° C. The above-mentioned heated carbonaceous substrate is present in the processing furnace, and an aromatic hydrocarbon or an alicyclic hydrocarbon is added to the heated carbonaceous substrate in an amount of 0.1 to 2 minutes.
An inert gas represented by a nitrogen gas containing 0% by volume, preferably 3 to 10% by volume is supplied.

When the temperature of the processing furnace is lower than 650 ° C., the amount of generated pyrolytic carbon is small, and an enormous amount of time is required for vapor deposition.
At a temperature exceeding 850 ° C., the amount of pyrolytic carbon generated is too large, and the speed at which the micropore diameter narrows becomes high and control becomes impossible.

In the case of industrial production, the time for the vapor deposition process is 10 times.
Min to 480 min, more preferably 10 min to 120
Minutes or less is preferable from the viewpoint of quality stability. The flow rate of the hydrocarbon-containing inert gas during the deposition process is 1 cm /
It is preferably at least s and at most 200 cm / s. Although the vapor deposition can be performed using a fixed bed or a moving bed such as a rotary furnace, a method using a fluidized bed is preferable because the processing temperature can be made uniform. The gas at the time of vapor deposition can be circulated, but a method of circulating after removing precipitated fine carbon particles with a filter or the like is preferable.

After such a vapor deposition process, molecular sieved carbon can be obtained by cooling in an inert gas atmosphere.

According to the above-described processing method, pyrolytic carbon released from an aromatic hydrocarbon or an alicyclic hydrocarbon is deposited near the micropore inlet of the carbonaceous substrate, and the processing temperature, processing time, aromatic hydrocarbon Alternatively, by appropriately controlling the concentration of the alicyclic hydrocarbon within the above-described range, it is possible to produce molecular sieve carbon having micropores of 3 to 4% and having a narrow pore size distribution with good reproducibility and low cost. .

It is to be noted that, after the deposition processing, if the temperature is kept at a temperature not lower than the deposition processing temperature and not higher than 1100 ° C. in an inert gas atmosphere, still better results are obtained. The effect is to firmly fix the micropore size distribution obtained by the vapor deposition process. In addition, maintaining the high temperature also has the effect of narrowing the diameter of the micropores exceeding 4 °, and thus has the effect of sharpening the distribution of the micropores generated by the vapor deposition process. If the temperature is lower than the deposition temperature, this effect cannot be obtained. The temperature is 1100 ° C
If it exceeds, the micropores rapidly disappear, which is not preferable. According to the method described above, the micropore diameter is 3 to 4 mm.
Strong and narrow molecular sieve carbon can be produced simply, inexpensively and with good reproducibility.

[0034]

The present invention will be described below with reference to examples. (Example 1) Coal tar pitch was heat-treated to obtain an optically isotropic pitch having a softening point of 210 ° C and an ash content of 350 ppm or less. The pitch was extruded and spun to obtain a pitch fiber having a diameter of 14 μm. This pitch fiber is heated in a furnace from room temperature to 300 ° C. over 5 hours while sending air thereinto,
The fiber was held for an additional hour to obtain a pitch-infusible fiber. The pitch infusibilized fiber is pulverized by an impeller mill (INP250 type, manufactured by Seishin Enterprise Co., Ltd.), and the average fiber length is 0.35 m.
m of pitch infusible fiber. Next, 15 parts by weight of a coal tar pitch having a softening point of 110 ° C. was mixed with 100 parts by weight of the crushed pitch infusible fiber. This mixed raw material was tumbled and granulated while adding water by a dish-type granulator having a diameter of 1000 mm to obtain a granulated body having a diameter of 3.35 to 4.8 mm.
The granules were dried at 200 ° C. to remove water. Hereinafter, this granulated body is referred to as a fiber granulated body. This fiber granulation is classified and the particle size is 3.35 to 4 mm and 4 to 4.
It was separated into two types of 8 mm.

The granulated fiber having a particle size of 3.35 to 4 mm is heated in a furnace to 300 ° C. while supplying nitrogen gas, and then heated to 5 ° C./min while supplying nitrogen gas containing 50% carbon dioxide gas. The material was heated at a speed of 1000 ° C., kept at this temperature for 2 hours to perform an activation treatment, and then cooled in nitrogen gas to obtain a carbonaceous substrate I. The activation yield of the carbonaceous substrate I was 56%. The micropores are in the range of 5 to 11 ° as shown in FIG.
At 2 °, the specific surface area was 800 m ² / g.

The micropore size distribution is represented by the relationship between the integrated micropore volume and the micropore size. Micropore volumes of 6 ° or less include carbon tetrachloride (minimum molecular diameter: 6 °), isobutane (5.0 °), n-butane (4.3 °), ethane (4.0 °), and carbon dioxide (3.0 °). measuring the adsorption isotherm of 3 Å), from Dubinin-Astakhov plots to obtain the maximum adsorption volume W ₀ of each was represented by the value. Also, 6Å
The micropore volume of a larger diameter was determined by analyzing the nitrogen adsorption isotherm at the liquid nitrogen temperature by the MP method. _{W / W 0 = exp {-} (A / E) n} W: micropore volume relative pressure being fully when the ^{_{P / P 0 [cm 3 /}} g] W 0: maximum adsorption volume [cm ³ / g A: adsorption potential [mol / joul] E: characteristic energy of adsorption [joul / mol] n: a constant of 1 to 6 P ₀ : saturated vapor pressure of the adsorbed gas at the measurement temperature [torr] P: vapor pressure of the adsorbed gas [Torr]

Next, the carbonaceous substrate I was heated to 725 ° C. while supplying nitrogen gas in a furnace. Subsequently, a nitrogen gas containing 7.8% of benzene was fed at this temperature and a pyrolysis carbon deposition treatment was performed for 90 minutes, followed by cooling with nitrogen gas to produce a molecular sieve carbon I-1.

Similarly, using a carbonaceous substrate I, a molecular sieve carbon I-2 having a pyrolysis carbon deposition time of 120 minutes was produced as a trial. FIG. 1 shows the micropore size distribution of I-1 and I-2. It can be seen that the micropores have been narrowed to slightly more than 3 to 4 ° by the pyrolytic carbon deposition process, without substantially reducing the micropore volume. Next, in order to evaluate molecular sieving properties, oxygen of I-1 and I-2 (minimum molecular diameter of 2.8) was used.
Å), nitrogen (3.0 （), carbon dioxide (3.3Å),
The adsorption isotherm for methane (4.0 °) was measured.
For the measurement, an adsorption isotherm measuring apparatus Bellsorp 18 (high-pressure measurement specification, Nippon Bell Co., Ltd.) was used for the measurement. The results are shown in FIGS. Both I-1 and I-2
There is a large difference between the adsorption amounts of methane and carbon dioxide (FIG. 2), indicating excellent equilibrium separation type molecular sieving.
I-2 also shows some equilibrium separation type molecular sieve properties for oxygen and nitrogen (FIG. 3). FIG.
1 is a comparison of nitrogen and oxygen adsorption rates of I-2. The measurement method is based on a method of placing a molecular sieve carbon sample in a container of known volume, evacuating the system, introducing a gas (nitrogen, oxygen) to be adsorbed, and measuring the time and pressure after introduction. The measurement was performed using the same bell soap 18 as used for the measurement of the adsorption isotherm. From FIG. 4, it can be seen that while the adsorption of oxygen is completed within a very short time, the time required to complete the adsorption of nitrogen is very long. That is,
It is clear that I-1 and I-2 have very good rate-separation type molecular sieving properties.

(Example 2) Particle size produced in Example 1
A fibrous granule of 35 to 4 mm was activated in the same manner as in Example 1 to obtain a carbonaceous substrate G. However, the holding time at 1000 ° C. was 1 hour. The activation yield of the carbonaceous substrate G was 65%. The micropores are in the range of 5 to 10 ° as shown in FIG.
At 2 °, the specific surface area was 590 m ² / g.

Next, the carbonaceous substrate G was heated to 725 ° C. in a furnace while supplying nitrogen gas. Subsequently, while supplying nitrogen gas containing 7.8% or 12.6% of benzene at this temperature and holding for 60 minutes to perform pyrolytic carbon vapor deposition, 750 is further supplied while further supplying nitrogen gas.
C. for 60 minutes, and then cooled with nitrogen gas to obtain two types of molecular sieve carbon G-1 (benzene: 7.8%), G-
2 (benzene: 12.6%) was prototyped.

FIG. 5 shows the micropore size distribution of G-1 and G-2. It can be seen that the micropores have been reduced to 3-4 ° by the pyrolytic carbon deposition process without reducing the micropore volume.

Next, in order to evaluate the molecular sieve property, adsorption isotherms of carbon dioxide, methane, oxygen and nitrogen were measured. The results are shown in FIGS. From FIG. 6, G-1, G
It can be seen that both -2 have excellent equilibrium separation type molecular sieve performance with respect to methane and carbon dioxide gas. FIG. 7 shows that G-2 also has an equilibrium separation type molecular sieve performance for oxygen and nitrogen.

FIG. 8 shows the results of comparing the adsorption rates of nitrogen and oxygen of G-1 and G-2. From this figure, G-1, G
It can be seen that both -2 have excellent rate separation type molecular sieving performance with respect to nitrogen and oxygen.

(Example 3) Particle size 4 to 4 produced in Example 1
A 4.8 mm fiber granule was activated in the same manner as in Example 2 to obtain a carbonaceous substrate H. The activation yield of the carbonaceous substrate H was 69%. The micropores, as shown in FIG.
It is in the range of 5-9 °, with an average micropore diameter of 6.0 °.
And the specific surface area was 470 m ² / g.

Next, the carbonaceous substrate H was heated to 725 ° C. while feeding nitrogen gas in a furnace. Subsequently, a nitrogen gas containing 7.8% of benzene was fed at this temperature and a pyrolysis carbon vapor deposition treatment was performed for 90 minutes, followed by cooling with nitrogen gas to produce a molecular sieve carbon H-1.

FIG. 9 shows the micropore size distribution of H-1.
It can be seen that the micropores have been reduced to 3-4 ° by the pyrolytic carbon deposition process without reducing the micropore volume.

Next, in order to evaluate the molecular sieve property, adsorption isotherms of carbon dioxide, methane, oxygen and nitrogen were measured. The results are shown in FIGS. From FIGS. 10 and 11,
It can be seen that H-1 has an excellent equilibrium separation type molecular sieve performance for methane and carbon dioxide gas, and also for oxygen and nitrogen.

FIG. 12 shows the results of comparing the adsorption rates of nitrogen and oxygen of H-1. From this figure, it can be seen that H-1 has not only an equilibrium separation type for nitrogen and oxygen, but also an excellent rate separation type molecular sieve.

[0049]

According to the method for producing molecular sieved carbon of the present invention, molecular sieved carbon having a micropore diameter of 3 to 4 mm or more and having a narrow micropore diameter distribution can be produced simply and with good reproducibility. . The molecular sieve carbon obtained by the present invention is particularly excellent in the equilibrium separation type molecular sieve performance for methane and carbon dioxide gas, and the rate separation type molecular sieve performance for nitrogen and oxygen.

[Brief description of the drawings]

FIG. 1 shows carbonaceous substrate I and molecular sieve carbon I-
It is the figure which expressed micropore diameter distribution of No. 1 and I-2 by an integrated distribution. The vertical axis represents the integrated micropore volume, and the horizontal axis represents the micropore diameter.

FIG. 2 is a diagram showing adsorption isotherms of carbon dioxide and methane of molecular sieve carbons I-1 and I-2.

FIG. 3. Nitrogen of molecular sieve carbons I-1 and I-2,
It is a figure which shows the adsorption isotherm of oxygen.

FIG. 4 is a diagram expressing the adsorption rates of nitrogen and oxygen of molecular sieve carbon I-1 by changes in the amount of adsorption with respect to time.

FIG. 5 shows carbonaceous substrate G and molecular sieve carbon G-
FIG. 1 is a diagram expressing the micropore size distribution of G-2 by an integrated distribution.

FIG. 6: Carbon dioxide gas of molecular sieve carbons G-1 and G-2,
It is a figure which shows the adsorption isotherm of methane.

FIG. 7 is a diagram showing adsorption isotherms of nitrogen and oxygen of molecular sieve carbons G-1 and G-2.

FIG. 8 is a diagram expressing the adsorption rates of nitrogen and oxygen of molecular sieve carbons G-1 and G-2 by changes in the amount of adsorption with time.

FIG. 9 shows carbonaceous substrate H and molecular sieve carbon H-1.
FIG. 3 is a diagram in which the micropore size distribution of is represented by an integrated distribution.

FIG. 10 is a diagram showing adsorption isotherms of carbon dioxide and methane of molecular sieve carbon H-1.

FIG. 11 is a diagram showing adsorption isotherms of nitrogen and oxygen of molecular sieve carbon H-1.

FIG. 12 is a diagram expressing the adsorption rates of nitrogen and oxygen of molecular sieve carbon H-1 by changes in the amount of adsorption with respect to time.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI C04B 41/85 C04B 41/85 F (72) Inventor Yukihiro Osugi 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Technology Research Division (72) Inventor Yoshio Nakano 7-2 10-104 Akamatsucho, Chigasaki City, Kanagawa Prefecture (56) References JP-A-1-291158 (JP, A) JP-A-6-142508 (JP) , A) S.S. V. MOORE, et al, THE PREPARATION FO CARBON MOLECULAR S IEVES BY PORE BLOCK KING, Carbon, Vol. 15, p. 177-180 (58) Fields investigated (Int.Cl. ⁷ , DB name) C01B 31/00-31/36 C01B 33/20-39/36 C10C 1/00-5/00 B01D 53/02-53 / 12 B01J 20/00-20/34 INSPEC (DIALOG)

Claims (3)

(57) [Claims] (1)Softening point 150 ℃ or more, Ash content 5000ppm
Manufactured using the following optically isotropic pitch as a raw material,
Carbonaceous substrate having an average micropore diameter of 5.5 to 12 °
In a processing furnace heated to 650 to 850 ° C.
Inert gas containing hydrogen chloride and / or alicyclic hydrocarbon
And supply pyrolyzed carbon to the micropores
A method for producing molecular sieve carbon. 2. A softening point of 150 ° C. or more and an ash content of 5000 ppm.
The following optically isotropic pitch, crushed or fiber,
This is made infusible, then molded, and further subjected to an activation treatment in an inert gas atmosphere containing carbon dioxide gas and / or water vapor to obtain porous carbon having a specific surface area of 300 to 1000 m ² / g. The method for producing molecular sieve carbon according to claim 1, which is used as a material. Wherein said After the deposition process is completed, subsequently the molecular sieve process for producing a carbon according to claim 1 or 2, characterized in that retaining a deposition treatment temperature above 1100 ° C. temperature below under an inert gas atmosphere.