JP2009142719A - Volatile organic matter recovery apparatus and volatile organic matter recovery system having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extremely useful volatile organic matter recovery apparatus and a system having the same, using a technology in which high VOC adsorbing capacity of a porous adsorbent, such as activated carbon, zeolite, or mesoporous silica is combined with high VOC absorbing capacity of a volatile organic matter absorbing material. <P>SOLUTION: The volatile organic matter recovery apparatus 10 recovering volatile organic matter comprises a volatile organic matter adsorbing tank 16 disposed with a volatile organic matter adsorbent 18 therein, adsorbing and cleaning gas 12 to be cleaned containing the volatile organic matter introduced from an introducing port 14 and discharging from a discharge port 20, and a volatile organic matter absorbing tank 28 disposed with a volatile organic matter absorbing material 30 therein, and introducing the volatile organic matter adsorbed in the volatile organic matter adsorbent 18 for absorbing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a volatile organic substance recovery processing apparatus used for recovery processing of a volatile organic substance and a recovery processing system having the same.

  Many organic solvents used in large quantities in various fields such as painting, printing, and cleaning contain a large amount of volatile organic substances (VOCs). Therefore, when such organic solvents are used, VOCs are included. A large amount of gas is generated and released into the atmosphere.

  Since this VOC is the main cause of photochemical oxidants and suspended particulate matter, emission regulations and voluntary efforts are being promoted for VOC emissions and scattering from fixed sources such as factories. For example, as in the techniques disclosed in Patent Documents 1 and 2, a combustion method mainly using a catalyst or a combustion aid is used for a relatively high concentration VOC generated in a large-scale factory or the like. Countermeasures are taken by processing.

However, the combustion method using the catalyst, the auxiliary combustor, and the like disclosed in Patent Documents 1 and 2 is not suitable for the low-concentration and large-air-volume VOC treatment generated in a small and medium factory. Therefore, the decisive technology that enables VOC processing at a low cost as desired by the painting, printing and cleaning industries centered on small and medium factories has not yet been established.

In order to satisfy the above demand, a method of using an adsorbent having a high adsorption ability even at a low VOC concentration and collecting it is most appropriate. For example, as disclosed in Patent Document 3, a technique using activated carbon as an adsorbent is known. The method of Patent Document 3 has a large specific surface area of 1000 m ² / g or more, and VOC can be efficiently recovered. However, since the activity is reduced due to regeneration after adsorption, there is a problem in that reuse is limited. Further, since heat is generated by adsorbing VOC, there is a high risk of spontaneous ignition, and there is a problem in that there is a risk in the VOC recovery work.

  On the other hand, inorganic oxide-based adsorbents such as zeolite, which are non-flammable adsorbents, are known. This inorganic oxide-based adsorbent is reproducible and suitable for recovering flammable VOC, but causes problems such as “low amount of VOC that can be processed” and “expensive” compared to activated carbon, Convenience is not good.

  In order to solve these problems, various organic solvent recovery systems have been proposed. In general, an organic solvent recovery system is composed of a concentrating device for concentrating organic solvent vapor and a liquefying device for liquefying the concentrated organic solvent. Conventionally, the organic solvent concentrating system used in this organic solvent recovery system is used. The apparatus, after adsorbing an organic solvent to an adsorbent of one tower among a plurality of adsorbent towers having an adsorbent inside, desorbs the organic solvent from the adsorbent of one tower and concentrates it (for example, patent Reference 4).

However, this concentration method does not sufficiently desorb without a certain amount of air at the time of desorption, so the flow rate in the desorption process cannot be significantly reduced, and there is a limit to increasing the concentration factor. Also, at such a low concentration ratio, for example, in the liquefaction process when liquefying and recovering, the organic solvent cannot be liquefied and recovered unless it is cooled to a considerable temperature by the cooling device, so the cooling device is enlarged, There was a problem that the cost was increased accordingly.
Japanese Patent No. 3768733 JP 2004-125329 A JP 2000-93727 A Japanese Patent No. 3421923

  In order to solve the above problems and problems, the present invention, for example, has a high VOC adsorption treatment capacity possessed by a porous adsorbent such as activated carbon, zeolite, and mesoporous silica, and a high VOC possessed by a volatile organic absorbent. It aims at proposing a very useful volatile organic substance recovery processing apparatus and a system having this apparatus by using a new technique of combining absorption capacity.

In order to solve the above-described problems, the present invention takes the following technical means.
That is, the volatile organic matter adsorbent is disposed inside, and adsorbs and purifies the gas to be purified containing the volatile organic matter introduced from the introduction port and leads out to the outside from the delivery port. A volatile organic substance absorbent is disposed inside, and a volatile organic substance absorption tank that introduces and absorbs the volatile organic substance adsorbed on the volatile organic substance adsorbent. It is a volatile organic substance recovery processing device.

The invention described in claim 2 is the volatile organic substance recovery treatment apparatus according to claim 1, wherein the volatile organic substance adsorption tank and the volatile organic substance absorption tank are provided with openable opening / closing means. It is characterized by being integrally formed through a partition plate.

A third aspect of the present invention is the volatile organic substance recovery processing apparatus according to the second aspect, wherein the opening / closing means includes a check valve.

Moreover, invention of Claim 4 is a volatile organic substance collection | recovery processing apparatus of any one of Claim 1 thru | or 3, Comprising: The inside of the said volatile organic substance absorption tank is pressure-reduced in the said volatile organic substance absorption tank. It is characterized by the fact that pressure reducing means is provided.

  Furthermore, the invention described in claim 5 is the volatile organic substance recovery treatment device according to any one of claims 1 to 4, wherein the volatile organic substance adsorption tank is adsorbed by a volatile organic substance adsorbent. It is characterized in that a heating means for promoting vaporization of the volatile organic substance is provided.

  Furthermore, invention of Claim 6 is a volatile organic substance collection | recovery processing apparatus of any one of Claims 1 thru | or 5, Comprising: The said volatile organic substance absorption tank is absorbed by the volatile organic substance absorber. The volatile organic substance is provided with a volatile organic substance storage means for evaporating and cooling the volatile organic substance and collecting and storing it.

  The invention described in claim 7 is the volatile organic substance recovery treatment apparatus according to any one of claims 1 to 6, wherein the volatile organic substance adsorbent includes micropores, mesopores, macropores, and these. It is a porous body provided with at least one of the combinations.

  The invention according to claim 8 is the volatile organic substance recovery treatment apparatus according to any one of claims 1 to 7, wherein the volatile organic substance adsorbent is activated carbon, zeolite, silicalite, clay mineral, hydrophobic One or more selected from the group consisting of porous silica gel, mesoporous silica, and carbon nanotubes.

  Furthermore, the invention described in claim 9 is the volatile organic substance recovery processing apparatus according to any one of claims 1 to 8, wherein the volatile organic substance absorbent is in a solid state or a gel form and is volatile. An inert organic solvent that dissolves the organic substance and a hydrophobic organic molecular substance as a gelling agent for the inert organic solvent. The inert organic solvent is preferably at least one of aliphatic dibasic acid ester, phthalic acid ester, silicone oil and a mixture thereof, and the aliphatic dibasic acid ester is preferably dimethyl adipate or dibutyl adipate. , Diisononyl adipate, diisodecyl adipate, dimethyl sebacate, and a mixture thereof are more preferable.

  And hydrophobic organic substances are polystyrene, octadecyl acrylate, triacontacrylate, polyethylene glycol, cyclodextrin, polymethyl acrylate, polycarbonate, epoxy resin, polyethylene, polyester, vinyl resin, cellulose, aliphatic hydrocarbon resin, natural rubber, It is preferable to use at least one of styrene butadiene resin, chloroprene rubber, wax, alkyd resin, and a mixture thereof. It is particularly effective to use these in a shape suitable for each use such as powder, paste, and fiber.

  Furthermore, the invention described in claim 10 is the volatile organic substance recovery processing apparatus according to any one of claims 1 to 9, wherein the volatile organic substance absorbent is staggered or formed in the volatile organic substance absorption tank. It is characterized by being arranged in a shape.

  The invention described in claim 11 is a volatile organic substance recovery processing system including at least the volatile organic substance recovery processing apparatus according to any one of claims 1 to 10.

  Since the volatile organic substance recovery processing apparatus according to the present invention and the volatile organic substance recovery processing system having the same can perform regeneration of the adsorbent that had to be frequently replaced and regenerated in the recovery processing apparatus, Running costs can be greatly reduced. In addition, the volatile organic absorbent used in the recovery treatment apparatus contains a high boiling point inert substance as a constituent element and can prevent spontaneous ignition of the absorbed VOC gas. The property becomes extremely high.

  And since the volatile organic substance collection | recovery processing apparatus which concerns on this invention, and the volatile organic substance collection | recovery processing system which has this have a volatile organic substance collection | recovery means, reproduction | regeneration of a volatile organic substance absorber is also carried out in the said collection | recovery treatment apparatus. It becomes possible. Moreover, the volatile organic substance absorbent used in the recovery device can collect high-concentration VOCs, and further connects a volatile organic substance absorption tank that collects high-concentration VOCs to the volatile organic substance recovery means. Therefore, it becomes possible to recover the VOC concentrated to a high concentration in a solution state or the like relatively easily.

  Examples of VOC include toluene, isopropyl alcohol, xylene, ethyl acetate, butyl acetate, dichloromethane, trichloroethylene, tetrachloroethylene, trichloroethyl, methanol, methyl ethyl ketone, and the like. Any volatile organic substance (VOC) can be used as the volatile organic substance recovery processing system.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an example diagram showing a volatile organic substance recovery processing apparatus according to the first embodiment of the present invention. 10 is a volatile organic substance recovery processing device, 12 is a gas to be purified, 14 is an inlet, 16 is a volatile organic substance adsorption tank, 18 is a volatile organic substance adsorbent, 20 is an outlet, 22 is purified air, and 24 is a partition plate , 26 is an opening / closing member, 28 is a volatile organic substance absorbing tank, 30 is a volatile organic substance absorbing material, and 32 is a pressure reducing means.

  First, as shown in FIG. 1 (a), a gas to be purified 12 containing volatile organic matter (VOC) generated from a fixed source is supplied from an inlet 14 of a volatile organic matter recovery treatment apparatus 10 to a volatile organic matter adsorption tank 16. To be introduced. Next, the volatile organic matter contained in the gas to be purified 12 is adsorbed and purified by the volatile organic matter adsorbent 18 disposed in the volatile organic matter adsorption tank 16. Subsequently, the to-be-purified gas 12 that has been adsorbed and purified is discharged from the outlet 20 to the outside as purified air 22.

In addition, by providing a valve that can be opened and closed manually or automatically at the inlet 14 and the outlet 20, it becomes possible to improve the efficiency and safety of the recovery process of the volatile organic matter. Further, when the purified air 22 discharged from the outlet 20 is passed through a filter made of activated carbon or the like and then discharged to the outside air, the volatile organic matter that could not be removed in the volatile organic matter adsorption tank 16 can be removed. It becomes possible to discharge to outside air safely. The volatile organic substance adsorbent 18 can be expected to improve the adsorption performance by using a porous material provided with micropores, mesopores, macropores and the like.

  Further, by selecting at least one volatile organic substance adsorbent 18 from the group consisting of activated carbon, zeolite, silicalite, clay mineral, hydrophobic silica gel, mesoporous silica, and carbon nanotube, the adsorption performance can be further improved. Further, by disposing the volatile organic substance adsorbent 18 in the volatile organic substance adsorption tank 16 in a zigzag or honeycomb form, it becomes possible to exhibit further excellent adsorption performance.

  Next, the flow of processing of volatile organic matter adsorbed on the volatile organic matter adsorbent will be described with reference to FIG. First, after the introduction of the gas to be purified 12 to the inlet 14 is stopped, the opening / closing member 26 provided on the partition plate 24 separating the volatile organic substance adsorption tank 16 and the volatile organic substance absorption tank 28 is opened. . Then, the volatile organic substance is desorbed from the volatile organic substance adsorbent 18, guided to the volatile organic substance absorption tank 28, and absorbed by the volatile organic substance absorbent 30. The opening / closing member 26 can be configured using a valve, a through-hole, a check valve, etc., so that the efficiency of the volatile organic substance recovery operation can be increased. Further, the volatile organic substance is volatilized from the volatile organic substance absorption tank 28. It is also possible to prevent reversal to the organic organic substance adsorption tank 16. Further, if the volatile organic material absorbing material 30 is disposed in a staggered or honeycomb shape in the volatile organic material absorbing tank 28, the absorption performance can be further improved.

  As an example, the method for desorbing the volatile organic substance (VOC) from the volatile organic substance adsorbent 18 in the present embodiment uses a pressure swing method (a method of desorbing by changing the pressure under a constant volume). The volatile organic substance absorption tank 28 is held in a reduced pressure environment by the pressure reducing means 32 in advance, and then the opening / closing member 26 provided on the partition plate 24 between the volatile organic substance adsorption tank 16 and the volatile organic substance absorption tank 28 is provided. The volatile organic substance adsorption tank 16 is decompressed and decompressed. Accordingly, volatile organic substances are desorbed from the volatile organic substance adsorbent 18 and are guided to the volatile organic substance absorption tank 28. Here, for example, when a check valve is used for the opening / closing member 26 as described above, the volatile organic substance once induced in the volatile organic substance absorption tank 28 does not return to the volatile organic substance adsorption tank 16, and the volatile organic substance adsorbent. It becomes possible to prevent re-adsorption to 18 more effectively.

In general, the adsorption / desorption of VOC depends on the ratio (P / P ₀ ) between the VOC saturated vapor pressure (P ₀ ) and the VOC partial pressure (P). That is, under the reduced pressure environment, the P / P ₀ value decreases and VOC is desorbed from the volatile organic substance adsorbent 18. If it does so, VOC will be induced | guided | derived to the volatile organic substance absorption tank 28, the VOC density | concentration in the volatile organic substance absorption tank 28 will become high, and it will be gradually absorbed by the volatile organic substance absorber 30.

  Further, the volatile organic material absorbent 30 is in a solid or gel form, and includes an inert organic solvent that dissolves the volatile organic material, and a hydrophobic organic molecular substance as a gelling agent for the inert organic solvent. In this case, it is possible to dramatically improve the absorption performance of the volatile organic substance that is guided to the volatile organic substance absorption tank 28, which is more effective.

  Hydrophobic organic substances include polystyrene, octadecyl acrylate, triacontacrylate, polyethylene glycol, cyclodextrin, polymethyl acrylate, polycarbonate, epoxy resin, polyethylene, polyester, vinyl resin, cellulose, aliphatic hydrocarbon resin, natural rubber, Formed by self-organization of low molecular weight compounds such as styrene butadiene resin, chloroprene rubber, wax, alkyd resin, and mixtures thereof, by using hydrogen bonds, intermolecular forces, and by crosslinking It is preferable to use a material having a dimensional structure. However, a hydrophobic organic substance as a gelling agent has a higher hydrophobicity, so a functional group having a high hydrophobicity such as an octadecyl group or a triacontyl group is used. Especially good. Furthermore, it is particularly effective to use these in powder form, paste form or fiber form.

  The inert organic solvent is an aliphatic dibasic acid ester such as dimethyl adipate or dimethyl sebacate (especially dimethyl sebacate has a melting point of 27 ° C., so it can be used as a solid and has excellent operability. Or any of the fragrance hydrocarbons, phthalates and silicone oils and mixtures thereof are very useful.

(VOC adsorption experiment of adsorbent)
Here, a VOC (adopting toluene in this experiment) adsorption experiment of the adsorbent in a dynamic environment will be described. With the configuration shown in FIG. 8A, 100 ppm of toluene gas is introduced from an air pump at a flow rate of 2 l / min into a collection tank containing a sample (in this experiment, polystyrene gel / activated carbon for comparison). And the FID detector was installed in the part derived | led-out from a collection tank, and the density | concentration of the derived | led-out toluene gas was monitored. As a result, as shown in FIG. 8B, it was found that the polystyrene gel hardly absorbs toluene as compared with activated carbon.

  This is because the specific surface area of polystyrene gel is narrow and the probability of contact with toluene in a dynamic environment is low, so that it cannot be absorbed well. On the other hand, in a static environment, there is sufficient time for toluene to contact the surface of the polystyrene gel, so that it can be absorbed well into the polystyrene gel by increasing the toluene concentration on the surface. That is, in a dynamic environment, it can be understood that a porous material such as activated carbon is superior in absorbing VOCs such as toluene.

  In a dynamic environment, a porous adsorbent such as activated carbon having a high VOC adsorption capacity is advantageous, and in a static environment, a volatile organic absorbent such as polystyrene gel having a high VOC absorption capacity is advantageous. Therefore, as described above, for example, a technique of combining the high VOC adsorption capacity of porous adsorbents such as activated carbon, zeolite, and mesoporous silica with the high VOC absorption capacity of volatile organic absorbents is used. Becomes very useful in the recovery process of volatile organic substances.

  FIG. 2 is an example diagram showing a volatile organic substance recovery treatment apparatus according to the second embodiment of the present invention. Reference numerals in the figure are the same as those given in FIG. 1, and 34 indicates a heating means. As shown in FIG. 2 (a), the gas to be purified 12 containing volatile organic substances generated from the fixed source is introduced into the volatile organic substance adsorption tank 16 from the inlet 14 of the volatile organic substance recovery treatment apparatus 10. . Subsequently, the volatile organic matter contained in the gas to be purified 12 is adsorbed and purified by the volatile organic matter adsorbent 18 disposed in the volatile organic matter adsorption tank 16. The purified gas 12 that has been adsorbed and purified is discharged from the outlet 20 to the outside as purified air 22.

  In addition, by providing a manually or automatically openable / closable valve at the inlet 14 and outlet 20, it becomes possible to improve the efficiency and safety of the recovery process of volatile organic substances. Further, when the purified air 22 discharged from the outlet 20 is passed through a filter made of activated carbon or the like and then discharged to the outside air, volatile organic substances that could not be removed in the volatile organic substance adsorption tank 16 can be removed. It becomes possible to discharge to the outside air more safely. Further, when a porous material having micropores, mesopores, macropores, or the like is used as the volatile organic material adsorbent 18, an improvement in adsorption performance can be expected.

Furthermore, the adsorption performance can be further improved by selecting one or more volatile organic adsorbents 18 from the group consisting of activated carbon, zeolite, silicalite, clay mineral, hydrophobic silica gel, mesoporous silica and carbon nanotubes. It becomes. Further, by disposing the volatile organic substance adsorbent 18 in the volatile organic substance adsorption tank 16 in a staggered or honeycomb form, it is possible to exhibit further excellent adsorption performance.

  Next, a processing flow of the volatile organic matter adsorbed on the volatile organic matter adsorbent 18 will be described with reference to FIG. First, after the introduction of the gas 12 to be purified to the inlet 14 is stopped, the opening / closing member 26 provided on the partition plate 24 separating the volatile organic substance adsorption tank 16 and the volatile organic substance absorption tank 28 is opened. Let Then, the volatile organic substance is desorbed from the volatile organic substance adsorbent 18, guided to the volatile organic substance absorption tank 28, and absorbed by the volatile organic substance absorbent 30. Note that the opening / closing member 26 can be configured using a valve, a through-hole, a check valve, or the like, thereby increasing the efficiency of the volatile organic matter recovery operation. Further, if the volatile organic material absorbing material 30 is disposed in a staggered or honeycomb shape in the volatile organic material absorbing tank 28, the absorption performance can be further improved.

  The method of desorbing volatile organic substances from the volatile organic substance adsorbent 18 in the present embodiment uses a heat desorption method. By heating the volatile organic substance adsorbent, the interaction between the adsorbate and the adsorbent is weakened, so that the adsorbate is desorbed. That is, the inside of the volatile organic substance adsorption tank 16 is heated using the heating means 34, the VOC adsorbed by the volatile organic substance adsorbent 18 is expelled, and the VOC gas is guided to the volatile organic substance absorption tank 28. Then, the VOC concentration in the volatile organic substance absorption tank 28 is increased, and the VOC is gradually absorbed by the volatile organic substance absorbent 30. In addition, the heating method by the heating means 34 is, for example, a method of heating the volatile organic substance adsorbent 18 directly by winding a heating wire around the volatile organic substance adsorbent 18 in a coil shape or an electric heater as a volatile organic substance adsorption tank. A method of heating the entire volatile organic substance adsorption tank 16 from outside, a method of arranging an electric heater inside the volatile organic substance adsorption tank 16 and heating the inside of the volatile organic substance adsorption tank 16, etc. It may be used.

The volatile organic material absorbent 30 is a solid or gel, and includes an inert organic solvent that dissolves the volatile organic material, and a hydrophobic organic molecular substance as a gelling agent for the inert organic solvent. By making it into a thing, it becomes possible to improve the absorption performance of the volatile organic substance induced | guided | derived to the volatile organic substance absorption tank 28 drastically.

  Hydrophobic organic substances include polystyrene, octadecyl acrylate, triacontacrylate, polyethylene glycol, cyclodextrin, polymethyl acrylate, polycarbonate, epoxy resin, polyethylene, polyester, vinyl resin, cellulose, aliphatic hydrocarbon resin, natural rubber, Formed by self-organization of low molecular weight compounds such as styrene butadiene resin, chloroprene rubber, wax, alkyd resin, and mixtures thereof, by using hydrogen bonds, intermolecular forces, and by crosslinking It is preferable to use a material having a dimensional structure. However, a hydrophobic organic substance as a gelling agent has a higher hydrophobicity, so a functional group having a high hydrophobicity such as an octadecyl group or a triacontyl group is used. Especially good. Furthermore, it is particularly effective to use these in powder form, paste form or fiber form.

The inert organic solvent is an aliphatic dibasic acid ester such as dimethyl adipate or dimethyl sebacate (especially dimethyl sebacate has a melting point of 27 ° C., so it can be used as a solid and has excellent operability. Or any of the fragrance hydrocarbons, phthalates and silicone oils and mixtures thereof are very useful.

  FIG. 3 is an example diagram showing a volatile organic substance recovery processing apparatus according to the third embodiment of the present invention. The reference numerals in the figure are the same as those in FIG. First, as shown in FIG. 3A, the gas to be purified 12 containing volatile organic substances generated from the fixed generation source is introduced into the volatile organic substance adsorption tank 16 from the inlet 14 of the volatile organic substance recovery treatment apparatus 10. The Next, the volatile organic matter contained in the gas to be purified 12 is adsorbed and purified by the volatile organic matter adsorbent 18 disposed in the volatile organic matter adsorption tank 16. Subsequently, the to-be-purified gas 12 that has been adsorbed and purified is discharged from the outlet 20 to the outside as purified air 22.

In addition, by providing a valve that can be opened and closed manually or automatically at the inlet 14 and the outlet 20, it becomes possible to improve the efficiency and safety of the recovery process of the volatile organic matter. Further, when the purified air 22 discharged from the outlet 20 is passed through a filter made of activated carbon or the like and then discharged to the outside air, volatile organic substances that could not be removed in the volatile organic substance adsorption tank 16 can be removed. It becomes possible to discharge to the outside air more safely. Moreover, it is effective for improvement of adsorption | suction performance to use the thing of the porous body provided with the micropore, the mesopore, the macropore, etc. for the volatile organic substance adsorption agent 18.

Further, by selecting one or more volatile organic substance adsorbents 18 from the group consisting of activated carbon, zeolite, silicalite, clay mineral, hydrophobic silica gel, mesoporous silica, and carbon nanotubes, the adsorption performance can be further improved. Further, by disposing the volatile organic substance adsorbent 18 in the volatile organic substance adsorption tank 16 in a zigzag or honeycomb form, it becomes possible to exhibit further excellent adsorption performance.

  Next, a processing flow of the volatile organic matter adsorbed on the volatile organic matter adsorbent will be described with reference to FIG. First, after the introduction of the gas 12 to be purified to the inlet 14 is stopped, the opening / closing member 26 provided on the partition plate 24 separating the volatile organic substance adsorption tank 16 and the volatile organic substance absorption tank 28 is opened. Let Then, the volatile organic substance is desorbed from the volatile organic substance adsorbent 18, guided to the volatile organic substance absorption tank 28, and absorbed by the volatile organic substance absorbent 30. Note that the opening / closing member 26 can be configured using a valve, a through-hole, a check valve, or the like, thereby increasing the efficiency of the volatile organic matter recovery operation. Further, if the volatile organic material absorbing material 30 is arranged in a staggered shape or a honeycomb shape in the volatile organic material absorption tank 28, it is more effective to improve the absorption performance.

  In this embodiment, the method for desorbing the volatile organic substance from the volatile organic substance adsorbent 18 employs a method combining the aforementioned pressure swing method and the heat desorption method. By heating the volatile organic substance adsorption tank 16 in a reduced pressure environment, the VOC gas can be desorbed at a lower temperature than in the second embodiment.

In addition, the volatile organic substance absorber 30 is a solid or gel, and includes an inert organic solvent that dissolves the volatile organic substance and a hydrophobic organic molecular substance as a gelling agent for the inert organic solvent. As a result, it is possible to dramatically improve the absorption performance of the volatile organic matter guided to the volatile organic matter absorption tank 28.

  Hydrophobic organic substances include polystyrene, octadecyl acrylate, triacontacrylate, polyethylene glycol, cyclodextrin, polymethyl acrylate, polycarbonate, epoxy resin, polyethylene, polyester, vinyl resin, cellulose, aliphatic hydrocarbon resin, natural rubber, Formed by self-organization of low molecular weight compounds such as styrene butadiene resin, chloroprene rubber, wax, alkyd resin, and mixtures thereof, by using hydrogen bonds, intermolecular forces, and by crosslinking It is preferable to use a material having a dimensional structure. However, a hydrophobic organic substance as a gelling agent has a higher hydrophobicity, so a functional group having a high hydrophobicity such as an octadecyl group or a triacontyl group is used. Especially good. Furthermore, it is particularly effective to use these in powder form, paste form or fiber form.

  The inert organic solvent is an aliphatic dibasic acid ester such as dimethyl adipate or dimethyl sebacate (especially dimethyl sebacate has a melting point of 27 ° C., so it can be used as a solid and has excellent operability. Or any of the fragrance hydrocarbons, phthalates and silicone oils and mixtures thereof are very useful.

  FIG. 4 is an example diagram showing a volatile organic substance recovery treatment apparatus according to the fourth embodiment of the present invention. The reference numerals in the figure are the same as those given in FIG. 1, and reference numeral 25 denotes a connecting member. In the present embodiment, the method for desorbing volatile organic substances from the volatile organic substance adsorbent 18 employs any one of the above-described pressure swing method, heat desorption method, or a combination thereof. When the volatile organic substance absorbing material 30 disposed in the volatile organic substance absorption tank 28 of the volatile organic substance recovery processing apparatus 10 is recovered, the volatile organic substance absorption tank 28 is removed from the connecting member 25, for example, a factory or the like. In addition, the volatile organic substance absorbing material 30 is carried out together with the volatile organic substance absorbing material 30 so that the recovery process can be performed.

  FIG. 5 is an example diagram showing a volatile organic substance recovery processing apparatus according to the fifth embodiment of the present invention. The reference numerals in the figure are the same as those given in FIG. 1, and 36 indicates a vacuum intermediate tank. As an example, a method of desorbing volatile organic substances from the volatile organic substance adsorbent 18 in the present embodiment uses a pressure swing method (a method of desorbing by changing pressure under a constant volume). The decompression intermediate tank 36 of the volatile organic substance recovery treatment apparatus 10 is previously held in a decompression environment by the decompression means 32, and subsequently provided on the partition plate 24 separating the volatile organic substance adsorption tank 16 and the decompression intermediate tank 36. The open / close member 26 is opened, the volatile organic substance adsorption tank 16 is depressurized, the volatile organic substance is desorbed from the volatile organic substance adsorbent 18, and is once guided to the depressurized intermediate tank 36.

Thereafter, the opening / closing member 26 provided on the partition plate 24 separating the decompression intermediate tank 36 and the volatile organic substance absorption tank 28 is opened, and volatile organic substances are induced from the decompression intermediate tank 36 to the volatile organic substance absorption tank 28 to volatilize. This is a flow of absorbing the organic material absorbing material 30. By adopting this configuration, further improvement in recovery efficiency can be expected.

  Fig.6 (a) is an example figure which showed the volatile organic substance collection | recovery processing apparatus in the 6th Embodiment of this invention. The reference numerals in the figure are the same as those given in FIG. The volatile organic substance adsorption tank 16 and the volatile organic substance absorption tank 28 of the volatile organic substance recovery processing apparatus 10 have a cylindrical structure as a whole as shown in FIG. A volatile organic substance adsorption tank 16 in which a volatile organic substance adsorbent (not shown) is disposed, and a volatile organic substance absorption tank 28 in which a volatile organic substance absorbent 30 is disposed are surrounded by the volatile organic substance adsorption tank 16. .

  First, the to-be-purified gas 12 containing the volatile organic substance generated from the fixed generation source is introduced into the volatile organic substance adsorption tank 16 from the inlet 14 of the volatile organic substance recovery processing apparatus 10. Next, the volatile organic matter contained in the gas to be purified 12 is adsorbed and purified by the volatile organic matter adsorbent 18 disposed in the volatile organic matter adsorption tank 16. Subsequently, the to-be-purified gas 12 that has been adsorbed and purified is discharged from the outlet 20 to the outside as purified air 22.

In addition, by providing a valve that can be opened and closed manually or automatically at the inlet 14 and the outlet 20, it becomes possible to improve the efficiency and safety of the recovery process of the volatile organic matter. Further, when the purified air 22 discharged from the outlet 20 is passed through a filter made of activated carbon or the like and then discharged to the outside air, volatile organic substances that could not be removed in the volatile organic substance adsorption tank 16 can be removed. It becomes possible to discharge to the outside air more safely. Further, the volatile organic substance adsorbent 18 is made of a porous material provided with micropores, mesopores, macropores, etc., so that the adsorption performance is improved.

Further, by selecting one or more volatile organic substance adsorbents 18 from the group consisting of activated carbon, zeolite, silicalite, clay mineral, hydrophobic silica gel, mesoporous silica, and carbon nanotubes, the adsorption performance can be further improved. Further, by disposing the volatile organic substance adsorbent 18 in the volatile organic substance adsorption tank 16 in a zigzag or honeycomb form, it becomes possible to exhibit further excellent adsorption performance.

  Next, the flow of treatment of volatile organic matter adsorbed on the volatile organic matter adsorbent will be described. First, after the introduction of the gas to be purified 12 to the inlet 14 is stopped, the partition plate 24 that separates the volatile organic substance adsorption tank 16 and the volatile organic substance absorption tank 28 of the volatile organic substance recovery processing apparatus 10 is provided. The open / close member 26 is opened. Then, the volatile organic substance is desorbed from the volatile organic substance adsorbent 18, guided to the volatile organic substance absorption tank 28, and absorbed by the volatile organic substance absorbent 30. Note that the opening / closing member 26 can be configured using a valve, a through-hole, a check valve, or the like, thereby increasing the efficiency of the volatile organic matter recovery operation.

  Next, a method for desorbing volatile organic substances from the volatile organic substance adsorbent 18 in the present embodiment will be described. After the volatile organic substance adsorbent 18 in the volatile organic substance adsorption tank 16 adsorbs VOC, for example, the VOC is desorbed from the volatile organic substance adsorbent 18 by a heat desorption method, and then the volatile organic substance adsorption tank 16 is illustrated in FIG. As shown in FIG. 6 (b), it is rotated in a predetermined rotation direction. Then, convection can be created between the volatile organic substance adsorption tank 16 and the volatile organic substance absorption tank 28 by the centrifugal force generated by the rotation.

Subsequently, the VOC desorbed from the volatile organic substance adsorbent 18 is guided toward the volatile organic substance absorption tank 28 surrounding the volatile organic substance adsorption tank 16 and is disposed in the volatile organic substance absorption tank 28. It will be absorbed by the volatile organic material absorber 30. As a heating method, for example, the volatile organic substance adsorption tank 16 may be heated using a heating device or the like, or the volatile organic substance adsorbent 18 is directly volatilized by winding a heating wire in a coil shape. The conductive organic adsorbent 18 may be heated. Further, in the volatile organic substance adsorption tank 16, for example, a volatile organic substance adsorbent 18 may be provided in a cartridge or the like, and the cartridge may be rotated in the volatile organic substance adsorption tank 16.

The volatile organic material absorbent 30 is a solid or gel, and includes an inert organic solvent that dissolves the volatile organic material, and a hydrophobic organic molecular substance as a gelling agent for the inert organic solvent. By making it into a thing, it becomes possible to improve the absorption performance of the volatile organic substance induced | guided | derived to the volatile organic substance absorption tank 28 drastically. Further, if the volatile organic material absorbing material 30 is arranged in a staggered shape or a honeycomb shape in the volatile organic material absorption tank 28, it is more effective to improve the absorption performance.

  Hydrophobic organic substances include polystyrene, octadecyl acrylate, triacontacrylate, polyethylene glycol, cyclodextrin, polymethyl acrylate, polycarbonate, epoxy resin, polyethylene, polyester, vinyl resin, cellulose, aliphatic hydrocarbon resin, natural rubber, Formed by self-organization of low molecular weight compounds such as styrene butadiene resin, chloroprene rubber, wax, alkyd resin, and mixtures thereof, by using hydrogen bonds, intermolecular forces, and by crosslinking It is preferable to use a material having a dimensional structure. However, a hydrophobic organic substance as a gelling agent has a higher hydrophobicity, so a functional group having a high hydrophobicity such as an octadecyl group or a triacontyl group is used. Especially good. Furthermore, it is particularly effective to use these in powder form, paste form or fiber form.

The inert organic solvent is an aliphatic dibasic acid ester such as dimethyl adipate or dimethyl sebacate (especially dimethyl sebacate has a melting point of 27 ° C., so it can be used as a solid and has excellent operability. Or any of the fragrance hydrocarbons, phthalates and silicone oils and mixtures thereof are very useful.

  FIG. 7 is an example diagram showing a volatile organic substance recovery processing apparatus according to the seventh embodiment of the present invention. 1 are the same as those in FIG. 1, 38 is a discharge pump, 40 is a diffusion tank, 42 is a pre-filter, 44 is a ventilator, 46 is a final filter, 48 is a cooling trap, 50 is a recovery solution tank, 52 denotes a vacuum pump, and 54 denotes a heat treatment apparatus.

  The volatile organic substance processing apparatus 10 according to the present embodiment includes a collecting means (concentration) for collecting VOC and a collecting and storing means for collecting and storing VOC from the collecting means. The collection means includes a pre-filter 42, a diffusion tank 40, a volatile organic substance recovery processing unit (in this embodiment, an inlet 14, a volatile organic substance adsorption tank 16, a volatile organic substance adsorbent 18, an outlet 20, and a partition plate. 24, the opening / closing member 26, the volatile organic substance absorption tank 28, and the volatile organic substance absorbent 30), the exhaust fan 44, the final filter 46, and the discharge pump 38. The recovery storage means is a cooling trap 48. The final filter 46, the recovered solution tank 50, the vacuum pump 52, and the heat treatment device 54 are included.

First, the to-be-purified gas 12 containing the volatile organic substance generated from the fixed generation source is introduced into the apparatus through the introduction port 14 by the discharge pump 38, and the solid matter is removed by the prefilter 42. Then, only the gas to be purified 12 is uniformly diffused in the diffusion tank 40, and the diffused gas to be purified 12 is introduced into the volatile organic substance adsorption tank 16 of the volatile organic substance recovery processing unit, and the volatile organic substance adsorbent 18 is introduced. To adsorb and purify. The purified air 22 from which the volatile organic substances have been purified passes through the outlet 20 and is sent to the exhaust fan 44, and then flows through the final filter 46 that removes volatile organic substances that may remain in a trace amount. It will be released into the atmosphere. The final filter 46 is preferably made of activated carbon or the like. Moreover, the volatile organic substance adsorbent 18 can improve the adsorption performance by using a porous body provided with micropores, mesopores, macropores and the like. Furthermore, by providing a manually or automatically openable and closable valve at the inlet 14 and outlet 20, it becomes possible to improve the efficiency and safety of the recovery process of volatile organic substances.

Further, by selecting one or more volatile organic substance adsorbents 18 from the group consisting of activated carbon, zeolite, silicalite, clay mineral, hydrophobic silica gel, mesoporous silica, and carbon nanotubes, the adsorption performance can be further improved. Further, by disposing the volatile organic substance adsorbent 18 in the volatile organic substance adsorption tank 16 in a zigzag or honeycomb form, it becomes possible to exhibit further excellent adsorption performance.

  Then, the volatile organic matter adsorbed on the volatile organic matter adsorbent 18 disposed in the volatile organic matter adsorption tank 16 is guided to the volatile organic matter absorption tank 28 and is disposed in the volatile organic matter absorption tank 28. It is absorbed by the volatile organic substance absorbent 30. In addition, the volatile organic substance absorber 30 is a solid or gel, and includes an inert organic solvent that dissolves the volatile organic substance and a hydrophobic organic molecular substance as a gelling agent for the inert organic solvent. As a result, it is possible to dramatically improve the absorption performance of the volatile organic matter guided to the volatile organic matter absorption tank 28. Further, if the volatile organic material absorbing material 30 is arranged in a staggered shape or a honeycomb shape in the volatile organic material absorption tank 28, it is more effective to improve the absorption performance.

In order to collect the volatile organic matter absorbed in the volatile organic matter absorbent 30, the following flow is taken. First, the volatile organic substance absorption tank 28 is decompressed by the vacuum pump 52 and further heated by the heat treatment device 54. Then, the volatile organic matter absorbed (collected) by the volatile organic matter absorbent 30 is vaporized. In addition, the heating method by the heat treatment apparatus 54 is, for example, a method of directly heating the volatile organic substance absorbent 30 by winding a heating wire around the volatile organic substance absorbent 30 in a coil shape, or an electric heater as a volatile organic substance absorption tank. 28, a method of heating the entire volatile organic substance absorption tank 28 from the outside, a method of arranging an electric heater inside the volatile organic substance absorption tank 28, and heating the inside of the volatile organic substance absorption tank 28, etc. It may be used.

Next, the vaporized volatile organic substance is guided to the cooling trap 48 (due to the pressure reducing operation by the vacuum pump 52). Then, the volatile organic substance once vaporized is cooled and liquefied, and the liquefied volatile organic substance is recovered in the recovery solution tank 50.

As shown in FIG. 9, in order to change toluene, which is a typical volatile organic substance, from gas to liquid (change when saturated vapor pressure is reached), it is adsorbed by activated carbon from toluene absorbed in polystyrene gel. Toluene is known to require cooling to lower temperatures. In other words, the use of polystyrene gel, which is an example of a volatile organic substance absorber, enables liquefaction recovery under higher temperature conditions, and the process of VOC collection and liquefaction that has been performed using activated carbon. It is possible to increase efficiency.

The recovered purified air 22 flows through a final filter 46 that removes volatile organic substances that may remain in minute amounts, and is released into the atmosphere. The final filter 46 is preferably made of activated carbon or the like.

  The volatile organic substance recovery processing apparatus and the volatile organic substance recovery processing system having the same according to the present invention do not require frequent replacement and regeneration of the volatile organic substance adsorbent or the volatile organic substance absorbent, and further in the apparatus. Therefore, the running cost can be reduced, and VOC countermeasures can be taken that are extremely excellent in terms of safety and function of the recovery process.

BRIEF DESCRIPTION OF THE DRAWINGS It is an example figure which showed the volatile organic substance collection | recovery processing apparatus in the 1st Embodiment of this invention simply, (a) showed the process of VOC gas, (b) showed the VOC collection | recovery process. It is a thing. It is an example figure which showed simply the volatile organic substance recovery processing device in a 2nd embodiment of the present invention, (a) shows processing of VOC gas, and (b) shows VOC recovery processing. It is a thing. It is an example figure which showed simply the volatile organic substance recovery processing device in a 3rd embodiment of the present invention, (a) shows processing of VOC gas, and (b) shows VOC recovery processing. It is a thing. It is the example figure which showed simply the volatile organic substance collection | recovery processing apparatus in the 4th Embodiment of this invention. It is an example figure which showed simply the volatile organic substance collection | recovery processing apparatus in the 5th Embodiment of this invention. (A) is the example figure which showed simply the volatile organic substance collection | recovery processing apparatus in the 6th Embodiment of this invention, (b) is the example figure which showed the cross-sectional structure simply. It is an example figure which showed simply the volatile organic substance collection | recovery processing apparatus in the 7th Embodiment of this invention. (A) is an example figure which showed the outline of the VOC adsorption | suction experiment method of adsorption agent, (b) is the figure which showed the experimental result. It is the figure which showed the toluene saturated vapor pressure curve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Volatile organic substance collection | recovery processing apparatus 12 Purified gas 14 Inlet port 16 Volatile organic substance adsorption tank 18 Volatile organic substance adsorption agent 20 Outlet port 22 Purified air 24 Partition plate 25 Connecting member 26 Opening / closing member 28 Volatile organic substance absorption tank 30 Volatility Organic absorbent 32 Depressurizer 34 Heating means 36 Depressurized intermediate tank 38 Discharge pump 40 Diffusion tank 42 Prefilter 44 Air exhauster 46 Final filter 48 Cooling trap 50 Recovery solution tank 52 Vacuum pump 54 Heat treatment apparatus

Claims (11)

A volatile organic substance adsorbing tank in which a volatile organic substance adsorbent is disposed, adsorbs and purifies a gas to be purified containing volatile organic substances introduced from the inlet, and leads out to the outside from the outlet,
A volatile organic substance absorbent is disposed inside, and a volatile organic substance absorption tank that introduces and absorbs the volatile organic substance adsorbed by the volatile organic substance adsorbent;
A volatile organic substance recovery treatment apparatus comprising:   2. The volatile organic substance recovery tank according to claim 1, wherein the volatile organic substance adsorption tank and the volatile organic substance absorption tank are integrally configured via a partition plate provided with an openable opening / closing means. Processing equipment.   The volatile organic substance recovery processing apparatus according to claim 2, wherein the opening / closing means includes a check valve.   4. The volatile organic substance recovery treatment apparatus according to claim 1, wherein the volatile organic substance absorption tank is provided with a decompression unit that depressurizes the inside of the volatile organic substance absorption tank. 5.   5. The heating device for promoting vaporization of volatile organic substances adsorbed by the volatile organic substance adsorbent is provided in the volatile organic substance adsorption tank. Volatile organic matter recovery processing equipment.   The volatile organic substance absorption tank is provided with a volatile organic substance storage means for vaporizing, cooling, and collecting and storing the volatile organic substance absorbed in the volatile organic substance absorbent. 6. The volatile organic substance recovery treatment apparatus according to any one of 5 above.   The volatile organic substance adsorbent is a porous body provided with at least one of micropores, mesopores, macropores, and combinations thereof. The volatile organic substance recovery processing apparatus described.   8. The volatile organic substance adsorbent is selected from the group consisting of activated carbon, zeolite, silicalite, clay mineral, hydrophobic silica gel, mesoporous silica, and carbon nanotubes. The volatile organic substance recovery processing apparatus according to 1.   The volatile organic substance absorbent material is solid or gel, and contains an inert organic solvent that dissolves the volatile organic substance, and a hydrophobic organic molecular substance as a gelling agent for the inert organic solvent. The volatile organic substance recovery processing apparatus according to any one of claims 1 to 8.   The volatile organic substance recovery processing apparatus according to any one of claims 1 to 9, wherein the volatile organic substance absorber is disposed in a staggered or honeycomb shape in the volatile organic substance absorption tank.   A volatile organic substance recovery processing system comprising at least the volatile organic substance recovery processing apparatus according to claim 1.

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