JP2010162335A - Deodorant and filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deodorant which efficiently adsorbs a polar odor component and a nonpolar odor component so as to perform deodorization, and also reduces the re-discharge of the adsorbed odor components by a temperature rise, and also to provide a deodorant filter. <P>SOLUTION: The deodorant, where an organic substance is stuck to active carbon, and the deodorant filter are provided, where the boiling point of the organic substance is ≥150°C and the melting point is ≤100°C and also the infinite dilution activity coefficient of methyl isobutyl ketone with respect to the organic substance is ≤10. It is preferable that the infinite dilution activity coefficient of methyl isobutyl ketone with respect to the organic substance to be stuck to the active carbon is ≤3, and the infinite dilution activity coefficient of 2-methyl furan is ≤5, while the infinite dilution activity coefficient of acetaldehyde is ≤5, and the infinite dilution activity coefficient of acetic acid is ≤10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a deodorizing agent, in particular, a specific organic substance is attached to activated carbon, and both polar odor components and non-polar odor components can be efficiently adsorbed and deodorized, and once adsorbed. The present invention relates to a deodorizing agent that is less likely to be re-released due to a temperature rise of an odor component and a filter using the deodorizing agent.

Conventionally, as a deodorizing agent, an organic material that easily adsorbs a polar odor component is attached to activated carbon.
In other words, activated carbon can preferentially adsorb non-polar odor components such as hydrocarbons, but it has weak adsorption power for low molecular weight polar odor components such as hydrogen sulfide, ammonia, and aldehydes. Known are alkali-added activated carbon in which an alkaline substance that easily adsorbs gas is attached to the surface of the activated carbon, and those in which various polar gas adsorbing substances are attached to the activated carbon.

  For example, JP-A-9-313828 reports that an improvement in the removal rate of formaldehyde is recognized by attaching ammonium sulfate, polyallylamine hydrochloride, EDTA · 2Na, triethanolamine, pyridine, etc. to activated carbon. ing. However, since the polar odorous substance impregnated with activated carbon with a polar gas adsorbing substance such as formaldehyde as described above retains the polar odorous substance by a chemical bond, there is no problem of re-releasing the adsorbed polar odorous substance due to an increase in temperature. However, there was a problem of re-releasing non-polar odor substances.

  In JP-A-2-115020, o-, m-, or p-aminobenzoic acid, p-aminosalicylic acid and salts thereof are used as an additive to activated carbon, and these are solid at room temperature. It is considered that the ability to retain odorous substances is generally low due to a decrease in the coverage of adsorbed components on the activated carbon surface because crystals are formed on the activated carbon surface.

JP-A-9-313828 Japanese Patent Laid-Open No. 2-115020

  The present invention solves the above-mentioned conventional problems, efficiently adsorbs and deodorizes polar odor components and non-polar odor components, and further, a deodorizer with less re-release due to temperature rise of these adsorbed odor components, It aims at providing the filter using this deodorizing agent.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have re-released non-polar odor components accompanying a rise in temperature, particularly 2- It was found that methylfuran re-release is prevented.
The present invention has been achieved on the basis of such findings, and the gist thereof is as follows.

[1] A deodorant obtained by attaching an organic substance to activated carbon, the organic substance having a boiling point of 150 ° C. or higher and a melting point of 100 ° C. or lower, and an infinite dilution activity of methyl isobutyl ketone with respect to the organic substance A deodorizing agent having a quantity coefficient of 10 or less.

[2] The deodorizer according to [1], wherein an infinite dilution activity coefficient of methyl isobutyl ketone with respect to the organic substance is 3 or less.

[3] The deodorizer according to [1] or [2], wherein an infinite dilution activity coefficient of 2-methylfuran with respect to the organic substance is 5 or less.

[4] The deodorizer according to any one of [1] to [3], wherein an infinite dilution activity coefficient of acetaldehyde with respect to the organic substance is 5 or less.

[5] The deodorizer according to any one of [1] to [4], wherein an infinite dilution activity coefficient of acetic acid with respect to the organic substance is 10 or less.

[6] A filter using the deodorizer according to any one of [1] to [5].

  Since the deodorizer of the present invention is obtained by attaching a specific organic substance to activated carbon, it is excellent in the adsorption efficiency of polar odor components and non-polar odor components, and also prevents re-release of the odor components accompanying the temperature rise.

  That is, since this organic substance is a substance that has a boiling point of 150 ° C. or more and hardly volatilizes, the organic substance is prevented from being volatilized and lost during use of the deodorizer, and the organic substance adhering to the activated carbon is used to prevent odor. Ingredients can be efficiently deodorized. In addition, since this organic substance is a low melting point substance having a melting point of 100 ° C. or lower, it is a liquid without crystallization, so that it can be a deodorizer having a large coverage on the activated carbon surface and excellent deodorization efficiency. it can. In addition, the infinite dilution activity coefficient of methyl isobutyl ketone with respect to the organic substance is 10 or less, preferably 3 or less, and is excellent in the adsorption performance of polar odor components such as methyl isobutyl ketone. If the dilution activity coefficient is 5 or less, the adsorption performance for non-polar odor components such as 2-methylfuran is excellent, and these polar odor components and non-polar odor components are efficiently adsorbed and deodorized. There is no problem of re-release due to the rise, and it exhibits an excellent deodorizing effect.

  In the deodorizer of the present invention, it is preferable that the infinite dilution activity coefficient of acetaldehyde with respect to the organic substance attached to the activated carbon is 5 or less, and the infinite dilution activity coefficient of acetic acid is 10 or less.

  The filter of the present invention is constituted using such a deodorizing agent of the present invention, and is excellent in deodorizing performance.

3 is a schematic diagram illustrating a configuration of a filter I created in Example 1. FIG. 1 is a schematic diagram illustrating a configuration of a flow test apparatus used in Example 1. FIG.

  Embodiments of the present invention will be described in detail below. However, the description of the constituent elements described below is an example (representative example) of the embodiments of the present invention, and the present invention does not exceed the gist thereof. , Not specified in these contents.

  The deodorizer of the present invention is a deodorizer obtained by attaching an organic substance to activated carbon, the organic substance having a boiling point of 150 ° C. or higher and a melting point of 100 ° C. or lower, and methyl isobutyl ketone for the organic substance. The infinite dilution activity coefficient is 10 or less.

[Activated carbon]
The activated carbon used in the present invention is not particularly limited, and those using coal-based materials (peat, lignite, and charcoal, bituminous coal, etc.) as raw materials, those using charcoal-based materials (coconut shells, wood, sawdust) as raw materials, Other materials such as petroleum pitch, synthetic resin, and various organic ash can be used, but those having a large specific surface area are preferred in order to secure the adsorbed amount of odor components, and in particular, the specific surface area is 1000 m. Those of ² / g or more are preferable because of their large adsorption amount.

  In particular, coconut shell activated carbon heat-treated from coconut shell as a raw material has many micropores having a pore diameter of 2 nm or less, and is also suitable for adsorption of odor components having a small molecular size.

  Moreover, it does not specifically limit as a shape of activated carbon, A granular, powdery, fibrous thing etc. can be used.

  Two or more kinds of activated carbons having different physical properties such as raw materials and specific surface areas, shapes, and the like may be used.

[Organic substances]
<Boiling point>
The boiling point of the organic substance attached to the activated carbon is 150 ° C. or higher, preferably 170 ° C. or higher. If the boiling point of the organic substance is too low, the organic substance adhering to the activated carbon volatilizes and desorbs from the activated carbon surface, not only the adsorption performance decreases, but the desorbed organic substance itself becomes an odor component. There is a problem. The upper limit of the boiling point of the organic substance is not particularly limited, but is usually 300 ° C. or lower.

<Melting point>
The melting point of the organic substance attached to the activated carbon is 100 ° C. or lower, preferably 50 ° C. or lower, more preferably 30 ° C. or lower. If the melting point of the organic substance is too high, crystals are formed on the surface of the activated carbon, so that the adsorption coverage on the surface of the activated carbon is lowered, thereby reducing the effect of collecting odor components. In particular, it is considered preferable that the organic substance is in a liquid phase state in the use temperature atmosphere of the deodorizer, that is, the melting point is not more than the use temperature condition. Although the minimum of melting | fusing point of an organic substance is not necessarily limited, Usually, it is -80 degreeC or more.

<Infinite dilution activity coefficient>
The organic substance attached to the activated carbon is desired to have high affinity for various odor components. An infinite dilution activity coefficient is used as an index expressing this affinity.

In multi-component gas-liquid equilibrium, the relational expression shown below (Formula 1) holds.
_pn = _Pn * [gamma] _n * _xn (Formula 1)
In the above (Formula 1),
p _n : partial pressure of component n in the gas phase (Pa)
P _n : Vapor pressure (Pa) when component n is present alone
γ _n : Activity coefficient of component n (−)
x _n : mole fraction of component n in the liquid phase (−)
Indicates.

Here, when the odor gas component in the gas phase is adsorbed and collected by the adsorbing component (organic substance) in the liquid phase, the smaller the activity coefficient is, the smaller the molar fraction x _n of the liquid phase is. It becomes high and it is easy to be collected, that is, it can be said that “high affinity”. In (Formula 1), when the concentration of the odor gas component is very low, an infinite dilution activity coefficient is applied as the activity coefficient γ _n . Therefore, affinity can be evaluated by an infinite dilution activity coefficient.

In the present invention, as an organic substance attached to the activated carbon, an infinite dilution activity coefficient of methyl isobutyl ketone relative to the organic substance is 10 or less, preferably 3 or less, and an infinite dilution activity coefficient of 2-methylfuran is preferable. Is 5 or less, more preferably 3 or less, the infinite dilution activity coefficient of acetaldehyde is preferably 5 or less, more preferably 3 or less, and the infinite dilution activity coefficient of acetic acid is preferably 10 or less, more preferably 6 or less.
The smaller the infinite dilution activity coefficient, the higher the affinity for each odor component, the better the adsorption deodorization efficiency, and the better the re-release prevention effect.

  In addition, the infinite dilution activity coefficient of the organic substance was determined by A. Klamt et al., “Journal of Physical Chemistry” (Journal of Physical Chemistry), (USA), American Chemical Society, 1995, Vol. 99, p. 2224, and A. Klamt et al. “Fluid Phase Equilibria” (Orchid), Elsevier, 2000, 172, p. It is calculated by the method described in 43.

<Specific example>
Examples of the organic substance satisfying the above characteristics include, for example, a compound having both a nonpolar group and a polar group, and specifically, a sulfoxide substituted with an alkyl group or an allyl group such as dimethyl sulfoxide and diphenyl sulfoxide. Compounds, ester compounds such as diethyl succinate, aliphatic alcohols such as 1,2-propanediol, and silanol group-containing compounds such as trimethylsilanol and triethylsilanol. Further, organic substances having high affinity with both the polar odor compound (acetaldehyde, methyl isobutyl ketone, acetic acid) and the non-polar odor compound (2-methyl furan) as described above, that is, the polar odor compound and non-polarity for the organic substance. Examples include squalane and D-(+)-limonene, which have low infinite dilution activity coefficients for both odorous compounds.

  Table 1 shows the calculated values of the infinite dilution activity coefficient of each odorous compound for the organic substances suitable for the present invention, together with the boiling point and melting point.

  These organic substances may be used alone or in combination of two or more.

<Attachment amount>
The amount of organic substance attached to the activated carbon is not particularly limited, but the organic substance is attached to the activated carbon in an amount of 0.01 to 5% by weight, particularly 0.1 to 2% by weight. It is preferable to do. If the amount of the organic substance added is too large, the coverage on the activated carbon surface becomes excessive and the specific surface area is reduced, so that the deodorizing performance is lowered. On the other hand, when the amount is too small, the affinity with the odor component due to the organic substance is not sufficiently exhibited, and the amount of re-release at the time of temperature increase is not preferable.

[Other attachment components]
In the deodorizer of the present invention, other components other than the organic substance may be attached to the activated carbon. Examples of such an adhering component include an alkali substance that has been used conventionally and excellent in the adsorption performance of polar odor components, and other various polar odor component adsorbing substances.

[Polar odor component adsorbent]
The deodorizer of the present invention can sufficiently absorb polar odor components alone, but other polar odor component adsorbents may be used in combination in order to increase the adsorption amount of polar odor components. The methods include a method in which powders and particulates are physically mixed and used, a method in which fibers are stuck together, and the other method is that the activated carbon surface is coated with a polar odor component adsorbent. May be. The polar odor component adsorbent for coating the activated carbon surface is not particularly limited as long as it can adsorb the polar odor component, but is preferably an ion exchange resin. Ion exchange resins include acidic cation exchange resins with functional groups such as sulfone groups and carboxyl groups, and basic anion exchange resins with amino groups, etc., but when aldehyde compounds such as acetaldehyde are targeted for adsorption. For this, a basic anion exchange resin is preferred.

  By covering the activated carbon surface with such a polar odor component adsorbent, the deodorizing ability of the polar odor component is improved, and when the polar odor component adsorbed on the activated carbon is re-released as the temperature rises, the odor component is Since it is re-adsorbed by the polar odor component adsorbent on the activated carbon surface, it is preferable in that re-release from the deodorant can be suppressed.

  Although it does not specifically limit as a coating amount of the polar odor component adsorption material to activated carbon, It is 1-30 weight% with respect to activated carbon weight, It is preferable to set it as 5-20 weight% especially. When the coating amount is too large, there is a problem in that the diffusion of odorous components to the activated carbon surface is inhibited and the deodorizing performance is lowered. Moreover, when there are too few, there exists a problem that the effect is not fully exhibited.

[Production method]
Next, a method for producing the deodorant of the present invention by attaching an organic substance to activated carbon will be described.
There are no particular limitations on the method of attaching the organic substance to the activated carbon, but there are broadly divided into the solid phase adhesion method and the liquid phase adhesion method, and any of them can be used.

  In the solid phase addition method, the organic substance to be attached is dissolved in a solvent in which the organic substance is soluble, impregnated with an organic substance solution in an amount corresponding to the liquid content of the activated carbon, and then the solvent alone is vacuum dried. It is the method of attaching by removing by etc. The amount of the organic substance to be attached can be adjusted by the concentration of the organic substance in the solution. Further, the solvent to be used is not particularly limited, but a solvent having a low boiling point such as water, ethanol and the like which is easy to handle and can be easily removed by a drying process is suitable.

  In the liquid phase addition method, an organic substance to be attached is dissolved in a solvent in which the organic substance is soluble, activated carbon is added to the solution, and the solution is stirred and mixed for a certain period of time. This is a method of separating the liquid and finally removing the remaining solvent by vacuum drying or the like. At this time, in order to simplify the operation, the solid-liquid separation step before drying can be omitted. The amount of the organic substance to be attached can be adjusted by the concentration of the organic substance in the solution. Further, the solvent to be used is not particularly limited, but a solvent having a low boiling point such as water, ethanol and the like which is easy to handle and can be easily removed by a drying process is suitable.

When the above-mentioned polar odor component adsorbent is coated on activated carbon, the coating method is not particularly limited, but generally the polar odor component adsorbent is dispersed in a dispersion medium such as water to form a slurry, A method is applied in which the slurry is adhered to the activated carbon surface by a granulator such as a fluidized bed granulator and then dried to remove the dispersion medium.
After the activated carbon is coated with such a polar odor component adsorbent, the above-described organic substance can be attached to produce the deodorizer of the present invention.

[Use / Form]
The deodorizing agent of the present invention can be applied to a wide variety of deodorizing objects. For example, industrial use used in factories that generate solvents such as plastic factories, printing factories, painting factories, waste incinerators, sewage treatment plants, etc. Various deodorization treatment equipment, air cleaning equipment installed indoors and outdoors, and in automobiles, air to remove odors from cigarette smoke, human bodies, human waste, refrigerators, automobile exhaust gas, etc. in the living environment It can be used in conditioners, fan heaters, deodorizers and the like.

  Moreover, as a usage form of the deodorizing agent of the present invention, it can be used in the form of powder, particles or fibers, but the deodorizing agent can be processed into a filter and used.

  When the deodorant of the present invention is used after being processed as a filter, its form is not particularly limited, but the deodorant is sandwiched between sheet materials having good air permeability such as nonwoven fabric, or the sheet material. It can be used after being processed into a filter by holding a deodorant.

  Moreover, in order to improve the deodorizing ability of a polar odor component, it can mix and use with deodorizing agents, such as an ion exchange resin, or it can use together with what processed the ion exchange resin into the filter form.

  EXAMPLES Hereinafter, although an Example demonstrates this invention more specifically, this invention is not limited to a following example at all unless the summary is exceeded.

[Example 1]
By impregnating a granular activated carbon having an average particle diameter of 1.2 mm (activated carbon “ABEKR1” manufactured by Mitsubishi Chemical Calgon Co., Ltd., specific surface area 1146 m ² / g) with an aqueous solution of 0.5% by weight of dimethyl sulfoxide, and drying, Dimethyl sulfoxide was supported at an addition amount of 0.2% by weight with respect to the activated carbon.

Next, as shown in FIG. 1, a circular nonwoven fabric B (Unitika Ltd.) having a thickness of 0.52 mm is used as a spacer 2 between two circular nonwoven fabrics A ("Elves S0403 WDO" manufactured by Unitika Ltd., diameter 45 mm) 1,1. A "Helves S1003WDO" (45 mm in diameter) centered in a circular shape with a diameter of 25 mm is placed, and the spacer 2 is filled with the obtained dimethyl sulfoxide-supporting activated carbon 3 in a heating press device. Was pressed at 130 ° C. for 2 minutes to prepare a filter I having a basis weight of dimethyl sulfoxide-supported activated carbon of 50 g / m ² .

Next, instead of dimethyl sulfoxide-supported activated carbon, an anion exchange resin having an average particle diameter of 0.6 mm (“Diaion WA20” manufactured by Mitsubishi Chemical Corporation) as a deodorizer is press-molded in the same manner as described above, A filter II having a basis weight of the anion exchange resin of 200 g / m ² was prepared.

  Next, as shown in FIG. 2, the laminated filter 7 in which the filter I and the filter II are stacked is placed in the gas flow so that the filter I is positioned on the inlet side 5 of the gas flow path 4 and the filter II is positioned on the outlet side 6. An adsorption performance test was conducted using a flow test device loaded in the passage 4.

  As a circulation gas, air having a 2-methylfuran concentration of 0.15 ppm and an acetaldehyde concentration of 0.55 ppm was circulated at 4.6 L / min for 5 hours, the inside of the above-mentioned circulation test apparatus was kept at 30 ° C., and the laminated filter 7 was The concentration of 2-methylfuran (hereinafter abbreviated as “MF”) and the concentration of acetaldehyde (hereinafter abbreviated as “AA”) in the outlet gas that passed through were fixed at regular time intervals (15 minutes after the start of distribution, 45 minutes later, 2 After 3 hours, 4 hours later).

Next, the removal rate of odor gas at each passage elapsed time was calculated from the following equation.
MF removal rate (%) = {(gas inlet MF concentration−gas outlet MF concentration) / gas inlet MF concentration} × 100
AA removal rate (%) = {(Gas inlet AA concentration−Gas outlet AA concentration) / Gas inlet AA concentration} × 100

Next, the MF adsorption amount qmt from the time (t−Δt) elapsed to the time elapsed t was calculated from the following equation.
qmt (g / g) = (flow amount of MF from time (t−Δt) to time t) (g) × MF removal rate (%) at time t / 100 / amount of deodorant attached to filter I (G)

Further, the MF adsorption amount QmT after 4 hours from the start of distribution was calculated from the following equation.
QmT (g / g) = qm0.25 + qm0.75 + qm2 + qm3 + qm4
here,
qm0.25: MF adsorption amount from the start of distribution to 15 minutes elapses qm0.75: MF adsorption amount from 15 minutes elapses to 45 minutes elapse qm2: MF adsorption amount from 45 minutes elapses to 2 hours elapse qm3: MF adsorption amount from 2 hours to 3 hours, qm4: MF adsorption amount from 3 hours to 4 hours.

  Similarly, the AA adsorption amount qat from the time (t−Δt) after the elapse of time to the time t has elapsed and the AA adsorption amount QaT after the elapse of 4 hours from the start of distribution were calculated from the following equations.

  qat (g / g) = (Amount of flow AA from time (t−Δt) to time t) (g) × AA removal rate (%) at time t / 100 / Amount of deodorant attached to Filter II (G)

QaT (g / g) = qa0.25 + qa0.75 + qa2 + qa3 + qa4
here,
qa0.25: AA adsorption amount from the start of distribution to 15 minutes elapses qa0.75: AA adsorption amount from 15 minutes elapses to 45 minutes elapse qa2: AA adsorption amount from 45 minutes elapses to 2 hours elapse qa3: AA adsorption amount from the elapse of 2 hours to the elapse of 3 hours qa4: AA adsorption amount from the elapse of 3 hours to the elapse of 4 hours.

  Furthermore, using the laminated filter composed of the filter I and the filter II after the above-described 5-hour circulation adsorption evaluation, the adsorption gas desorption performance test was performed using the same flow test apparatus.

  As the flow gas, air was circulated at 4.6 L / min for 5 hours, the inside of the flow test apparatus was kept at 40 ° C., and the MF concentration and AA concentration in the outlet gas vented through the filter were set at regular intervals (flow start 15 Minutes, 45 minutes, 2 hours, 4 hours).

The odor gas generation rate at each passage elapsed time was calculated from the following equation.
MF generation rate (g / hr) = gas outlet MF concentration × 4.6 × 60 × 82.1 / 0.082 / 273/1000000
AA generation rate (g / hr) = Gas outlet AA concentration × 4.6 × 60 × 44.1 / 0.082 / 273/1000000

Next, the MF desorption amount dmt from the time (t−Δt) to the time t was calculated from the following equation.
dmt (g / g) = MF generation rate at time t (g / hour) × Δt (hour) / deodorant amount attached to filter I (g)

Further, the MF desorption amount DmT after 4 hours from the start of distribution was calculated from the following equation.
DmT (g / g) = dm0.25 + dm0.75 + dm2 + dm4
here,
dm0.25: MF desorption amount from the start of distribution to 15 minutes dm0.75: MF desorption amount from 15 minutes to 45 minutes dm2: MF desorption amount from 45 minutes to 2 hours dm4: The amount of MF desorption from 2 hours to 4 hours.

  Similarly, the AA desorption amount dat from the time (t−Δt) after the elapse of time to the time t has elapsed and the AA desorption amount DaT after the elapse of 4 hours from the start of distribution were calculated from the following equations.

  dat (g / g) = AA generation rate after elapse of time (g / hour) × Δt (hour) / Amount of deodorant attached to Filter II (g)

DaT (g / g) = da0.25 + da0.75 + da2 + da4
here,
da0.25: AA desorption amount from the start of distribution to 15 minutes elapses da0.75: AA desorption amount from 15 minutes elapses to 45 minutes elapse da2: AA desorption amount from 45 minutes elapses to 2 hours elapse da4: AA desorption amount from 2 hours to 4 hours.

[Comparative Example 1]
In the same manner as in Example 1 except that granular activated carbon having an average particle diameter of 1.2 mm (“ABEKR1” manufactured by Mitsubishi Chemical Calgon Co., Ltd.) was used as it was as a deodorant to be attached to the filter I in Example 1. A laminated filter composed of filter I and filter II was prepared, and similarly, an adsorption performance test and an adsorption gas desorption performance test were performed.

  Table 2 shows the results of the 30 ° C. adsorption performance test and the 40 ° C. desorption performance test in Example 1 and Comparative Example 1. In Table 2, QmT and QaT indicate the adsorption performance of 2-methylfuran and acetaldehyde, respectively, and the larger the value, the better the adsorption performance. DmT and DaT represent the desorption performance of 2-methylfuran and acetaldehyde, respectively. The smaller the value, the smaller the amount of re-release.

  From Table 2, by adding dimethyl sulfoxide to the activated carbon surface, the re-release due to temperature rise is reduced even with respect to 2-methylfuran which is a non-polar odor component, and the deodorizer of the present invention absorbs and deodorizes. And it is understood that the re-release prevention performance is excellent.

1 Nonwoven fabric A
2 Nonwoven fabric B (spacer)
3 Activated carbon supported with dimethyl sulfoxide 4 Gas flow path 5 Inlet side 6 Outlet side 7 Multilayer filter

Claims (6)

  A deodorant formed by attaching an organic substance to activated carbon, the organic substance having a boiling point of 150 ° C. or higher and a melting point of 100 ° C. or lower, and an infinite dilution activity coefficient of methyl isobutyl ketone relative to the organic substance A deodorizing agent characterized by being 10 or less.   The deodorizer according to claim 1, wherein the activity coefficient of infinite dilution amount of methyl isobutyl ketone with respect to the organic substance is 3 or less.   The deodorizer according to claim 1 or 2, wherein an infinite dilution activity coefficient of 2-methylfuran with respect to the organic substance is 5 or less.   The deodorizer according to any one of claims 1 to 3, wherein an infinite dilution activity coefficient of acetaldehyde with respect to the organic substance is 5 or less.   The deodorizer according to any one of claims 1 to 4, wherein an infinite dilution activity coefficient of acetic acid with respect to the organic substance is 10 or less.   A filter using the deodorizer according to any one of claims 1 to 5.

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