KR101443903B1 - Toluene burn and decomposition apparatus - Google Patents

Abstract

The present invention relates to a toluene combustion and decomposition apparatus comprising a toluene adsorption tower filled with a toluene adsorbent to adsorb by inhaling toluene gas generated during a coating process and various coating processes in order to process the toluene more efficiently. The toluene combustion and decomposition apparatus is configured to burn the toluene by heating the toluene filled in the toluene adsorption tower at a preset temperature to desorb the adsorbed toluene and to let the desorbed toluene pass through a discharge tube generating a plasma by using microwaves, and configured to remove remaining toluene by passing a toluene decomposition catalyst filling tower in order to decompose and remove the toluene remaining after passing through the discharge tube.

Description

[0001] Toluene burn and decomposition apparatus [

The present invention relates to a toluene adsorption tower filled with a toluene adsorbent for adsorbing and adsorbing toluene gas generated during a coating process and various coating processes in order to more efficiently treat toluene, and the toluene adsorbed on the toluene adsorption tower is heated A toluene combustion catalyst which is configured to desorb the adsorbed toluene and pass through a discharge tube that generates plasma using a microwave to pass therethrough and to remove the remaining toluene after passing through a discharge tube through a toluene decomposition catalyst packing tower; And a decomposition apparatus.

Air pollutants in industrial facilities cause workers to lose productivity and carcinogenic potential, and environmental pollution problems and air pollution problems are causing problems.

Air pollutants in industrial facilities exist in particulate and gaseous phase, and particulate pollutants are decreasing year by year due to the development of removal technology, but pollutants on gas components are increasing.

Among these air pollutants, Volatile Organic Compound (VOC) is a harmful substance in many respects to humans and our environment because it has carcinogenic potential, tropospheric ozone formation, photochemical smog formation, and explosion.

According to the Ministry of Environment data, about 43% of artificial VOC generation in Korea is related to paint industry and about 13% is related to printing.

VOCs related to the painting industry VOCs generated during the coating process for architectural, automobile and electronic products are very large, about 20% and 10% of total anthropogenic VOC emissions.

Nevertheless, since VOCs generated in the coating industry are generated in the form of unspecified emissions (fugitive emissions), it is not easy to take appropriate preventive measures. Workers in industries that produce such coatings, printing facilities and related products should develop appropriate removal techniques to minimize adverse effects in the air environment.

Approximately 70% of the main VOC materials in paint and coating processes are being investigated as toluene.

Techniques for treating odorous and harmful gases (including VOCs) using microwave are still in the research stage, and they have not been commercialized yet.

Ian M. Kennedy and colleagues from the United States produced steam-plasma using microwave to measure the treatment efficiency of TCE among the VOCs and published the results in the AWMA journal.

Baillin et al. Have reported experiments on the decomposition efficiency of organic chemicals by generating oxygen plasma using microwaves. Hertzler et al. Also generated oxygen plasma using microwaves under vacuum to measure chlorine compound treatment efficiency Respectively.

Recently, Japanese researchers are actively conducting research on VOCs processing using microwaves. In particular, Suzuki et al. Studied the oxidation of metal chlorides by using oxygen plasma using microwave. And it was found that the treatment efficiency was very high.

That is, in the case of oxygen plasma using microwave, it is very important that not only the treatment of odor and VOCs contained in the gas but also the heavy metal component can be processed.

Shimizu et al. Also measured the efficiency of trichlorofluoroethane treatment using argon plasma using microwave. As a result, very high treatment efficiency was measured at the time of injecting a small amount of oxygen into pure argon plasma.

In particular, the results of his research have shown that the efficiency of microwave generation is higher when an AC microwave generator is used, which is much cheaper than that of DC, but the reason has not been proven.

However, the important result is that, in the case of DC microwave, the value of the device is very expensive. However, because the AC generation device which is commonly used in home is very cheap and easily obtainable, The result is very encouraging.

Therefore, it is applied in the environmental field to treat gaseous pollutants by decomposing harmful components or reacting them with other substances to detoxify them. Although these plasma technologies have many advantages, there are many problems such as excessive power consumption in the stage of technology development, necessity of large-scale device development, securing economical efficiency to compete with other technologies, and so much research is needed in the future.

As described above, research on the treatment of noxious gas using a plurality of microwaves outside the country has been actively conducted, but commercialized researches applicable to the field are still insufficient.

The problem to be solved by the present invention is that toluene in air is sucked into a toluene adsorption tower filled with a toluene adsorbent in order to efficiently treat toluene gas, which accounts for about 70% of VOCs substances generated in paint, painting process and various coating processes, , Which is heated and desorbed to a high concentration (10,000 ppm or more), and then it is burned by microwave plasma present in an ionized state to efficiently remove it.

Another problem to be solved by the present invention is to provide a toluene combustion and decomposition apparatus for decomposing toluene by passing through a packing tower of a toluene decomposition catalyst for decomposing and removing toluene remaining in gas after burning decomposition while passing through a plasma discharge tube .

The present invention provides a toluene adsorption tower filled with a toluene adsorbent for adsorbing and adsorbing toluene gas generated during a painting process and various coating processes to more efficiently process toluene, and is characterized in that toluene filled in a toluene adsorption tower is set After the toluene adsorbed by heating is heated to a high concentration, it is injected into a discharge tube and / or a chamber for generating plasma by using microwave, and is burned and decomposed in a discharge tube and / or a chamber. The present invention provides a toluene combustion and decomposition apparatus configured to remove toluene by passing it through a packing tower of a toluene decomposition catalyst to decompose and remove toluene.

Another object of the present invention is to solve the above-mentioned problems of the present invention by providing a toluene adsorption tower in which toluene is adsorbed by a suction fan in a toluene adsorption tower filled with an adsorbent (zeolite, activated carbon, etc.) and then adsorbing toluene adsorbed on the adsorbent, (Not less than about 10,000 ppm) of toluene gas, which is then transferred to a microwave plasma discharge tube and / or a chamber by a pipe or a hose to be burned using the plasma generated in the discharge tube, And to implement a toluene combustion and decomposition apparatus configured to combust while the plasma flame is amplified by the injected toluene gas.

A further object of the present invention is to provide a method for completely decomposing toluene remaining in a gas after passing through a plasma discharge tube and passing the toluene decomposition catalyst filled through a catalyst packed with a toluene decomposition catalyst, And to provide a toluene combustion and decomposition apparatus configured to remove the toluene.

In order to efficiently treat toluene gas, which accounts for about 70% of VOCs generated in paints, painting processes and various coating processes, toluene in air is sucked and adsorbed in a toluene adsorption tower filled with toluene adsorbent, And then the toluene is efficiently burned and removed by using a microwave plasma present in an ionized state.

Another advantage of the present invention is that it is possible to decompose more thoroughly by removing toluene through a toluene decomposing catalyst filling tower to decompose the remaining toluene to a maximum extent after burning decomposition while passing through a plasma discharge tube .

Another effect of the present invention is to provide an apparatus for decomposing and removing toluene material generated in a paint, a coating process, and various coating processes by using a plasma generator, .

Another effect of the present invention is to provide a device capable of burning and decomposing toluene in a short time while providing a plurality of toluene gas injection ports in a discharge tube, a chamber, and a slot to complete combustion.

1 shows a toluene combustion and decomposition apparatus according to the present invention.
FIG. 2 illustrates a toluene combustion decomposition apparatus using a microwave plasma according to the present invention.
FIG. 3 shows the structure of a chamber for efficiently burning toluene according to the present invention.
Fig. 4 shows the principle of microwave adjustment in a 3-stove.
FIG. 5 shows a toluene combustion and decomposition apparatus using a plasma produced for an experiment according to the design drawing of FIG.
FIG. 6 is a photograph of plasma in which flame is amplified by combustion of toluene supplied from an adsorption reactor using the apparatus of FIG.

Hereinafter, the present invention will be described in detail.

The present invention relates to a toluene adsorption tower filled with a toluene adsorbent for adsorbing and adsorbing toluene gas generated during a coating process and various coating processes in order to more efficiently treat toluene, and the toluene adsorbed on the toluene adsorption tower is heated The adsorbed toluene is desorbed to a high concentration and then injected into a plasma discharge tube and / or a chamber produced using a microwave. In order to decompose and remove toluene remaining in the combustion decomposed gas in the discharge tube and / And a toluene decomposition catalyst filled in a column to decompose the toluene. A specific embodiment according to the present invention will be described.

<Examples>

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described with reference to the drawings. FIG. 1 illustrates a toluene combustion and decomposition apparatus according to the present invention, and FIG. 2 illustrates a toluene combustion decomposition apparatus using microwave plasma according to the present invention. 1 shows a toluene combustion and decomposition apparatus according to the present invention.

In order to efficiently, quickly, and completely treat toluene gas, which accounts for about 70% of the VOCs generated in the coating process and various coating processes, a toluene adsorbent for sucking and adsorbing toluene gas present in the air is first filled The toluene adsorption tower is fixedly installed.

 The reason for installing the toluene adsorption tower is that the toluene gas in the air is rapidly and efficiently decomposed and removed, and when the concentrated toluene gas is injected into the plasma discharge tube and / or the chamber, the combustion decomposition can be efficiently performed while amplifying the flame.

The adsorbent to be packed in the toluene adsorption tower is made to be capable of rapidly adsorbing toluene by preparing granular materials having a very large surface area including zeolite or activated carbon (material having many fine holes).

It is preferable to provide a suction fan or a blowing fan for sucking the toluene in the air into the toluene adsorption tower at the front end or the rear end of the toluene adsorption tower.

In addition, it is preferable that a heating apparatus for heating the toluene adsorption tower is fixedly installed in the toluene adsorption tower in order to desorb the desorbed toluene after heating the adsorbed toluene to a predetermined temperature (150 to 200 ° C).

That is, the present invention includes a means for desorbing the adsorbed toluene by heating the toluene filled in the toluene adsorption tower to a predetermined temperature.

The concentration of toluene sucked into the toluene adsorption tower is about 50 to 100 ppm. When the adsorbed toluene is desorbed and discharged to the plasma discharge tube and / or the chamber through the pipe, the plasma flame generated in the discharge tube is amplified to about 10,000 ppm or more It is possible to rapidly decompose a large amount of toluene.

A conventional heating means such as an electric heater or a boiler type may be fixedly installed on the outside or inside of the heating device so that the toluene adsorbed on the adsorbent can be desorbed at a predetermined amount or more. (150 to 200 ° C).

The toluene adsorption tower is provided with a pipe for injecting toluene gas for injecting the desorbed toluene into a plasma discharge tube where plasma is generated or a chamber provided above the plasma discharge tube.

The plasma discharge tube according to the present invention corresponds to a low-temperature plasma at a temperature of about 1,000 ° C., and is configured to burn down and decompose toluene using microwave plasma in which the material is in an ionized state, thereby greatly improving the removal efficiency.

In general, about 70% of the VOCs generated in the coating process and various coating processes are decomposed by using microwave plasma to treat toluene gas with toluene, and at the same time, a flammable gas, toluene gas, And the flame is amplified and used as thermal energy.

Volatile organic compounds (VOCs) are highly safe and require high temperatures above 950 ° C to burn and decompose them.

In the present invention, a low-temperature microwave plasma at a temperature of about 1,000 ° C. is used. Since the material exists in an ionized state at a temperature of about 1,000 ° C., the VOCs containing toluene are burned The high removal efficiency can be ensured by decomposition.

Further, when a plasma is generated by using a microwave plasma discharge tube (39 in Fig. 2) to decompose toluene by combustion, a large amount of toluene can be burned and treated in a short time at a high concentration.

On the upper part of the microwave plasma discharge tube (39 in FIG. 2), a chamber in which a plurality of toluene gas injection openings are designed and manufactured is disposed so as to efficiently treat toluene gas.

The present invention is capable of performing combustion while amplifying a flame of a plasma by using toluene gas as fuel at the same time as decomposing toluene, and is capable of processing a large amount of toluene by installing a plurality of toluene gas injection ports in a chamber, a slot or the like.

The principle of the plasma generation is such that a plasma is generated in a discharge tube using a microwave generated in a magnetron (33 in FIG. 2) by using an argon input gas (Swirl gas = Ar gas) injected into an argon gas inlet , The toluene gas to be combusted is supplied from the toluene adsorption tower and injected into the reaction tube or chamber (39 in FIG. 2) to perform the combustion decomposition.

The argon gas injected into the argon gas inlet (42 in FIG. 2) is supplied with the energy provided by the microwave, excited, and the generated plasma. Toluene is introduced into the toluene gas inlet (43 in FIG. 2) To the lower inlet of the slot (38 in FIG. 2) installed in the center of the chamber.

The plasma discharge tube (34 in FIG. 2) is formed in a cylindrical shape between the upper portion of the argon gas inlet (42 in FIG. 2) and the lower portion of the slot (38 in FIG. 2) And is configured to generate plasma by microwave, argon gas, and ignition rod (41 in FIG.

The argon gas injected into the discharge tube is formed so that the argon gas inlet is inclined in the tangential direction so as to increase while forming a vortex at the time of injection to increase the combustion efficiency of the toluene gas.

Flame is mixed with toluene, which is a fuel material injected in eight directions, to a lower portion of the chamber (39 in FIG. 2), so that the flame is amplified twice as long as the chamber length, .

The number of toluene gas injection ports can be adjusted according to the length of the chamber and the length of the toluene gas inlet (see FIG. 3) in four or more directions.

FIG. 3 is a view illustrating a structure of a chamber for efficiently burning toluene according to the present invention, which is merely an embodiment, and can be modified into various shapes and sizes.

As shown in FIG. 3, in order to efficiently burn toluene, a toluene gas inlet for injecting toluene is formed at each side of the chamber and at a lower portion of the slot to inject the desorbed toluene gas in the adsorption reactor.

In addition, the slot (18 in FIG. 2) is formed in a long cylindrical shape, and a plurality of long holes are formed in the side surface to induce complete combustion, and toluene injected into the toluene gas injection port formed on the side of the chamber rises from the bottom It is constructed so that the flame can be amplified by burning together with the coming plasma.

More specifically, a high voltage transformer (32 in FIG. 2) is used to convert 320V to a 33,000V voltage from a commercial power source. The electric energy of 33,000 V transformed by using the 1 Kw magnetron (33 in FIG. 2) used as an embodiment of the present invention is converted into a microwave (wavelength energy) of 2.45 GHz.

A waveguide launcher 34 (waveguide launcher 34 in Fig. 2), a waveguide launcher 34 (in Fig. 2), and a waveguide launcher 34 (in Fig. 2) A stove tuner (35, 3-stub tuner in Fig. 2), and a sliding shot are installed.

The Waveguide Launcher sends the magnetron wavelength uniformly in one direction.

The transmitted microwaves are transmitted to the discharge tube (quartz tube) with minimal transmission loss. The microwaves are initially ignited using an igniter while the argon gas is injected into the argon gas inlet (42 in FIG. 2) The transmitted microwave is ignited and converted into thermal energy to excite argon gas to generate plasma.

In the 3-stove (35, 3-stub of FIG. 2), a stove capable of varying the length at a predetermined distance from each other is inserted into the waveguide to vary the length of the waveguide so as to match with the load impedance. The transmission loss is minimized and the maximum energy is efficiently transmitted to the discharge tube.

The spacing of each stove is set to &lt; RTI ID = 0.0 &gt; lambda / 4 &lt; / RTI &gt; of the wavelength in the waveguide for efficient transmission and is specifically illustrated in FIG. λ corresponds to one period of the in-pipe wavelength.

The toluene gas, which is the fuel material supplied to the chamber, rises while forming a vortex in the tangential direction, and can accommodate up to 350 liter per minute of toluene by adjusting the number of chambers and supply nozzles.

The reason for forming a plurality of nozzles is that not only a large amount of toluene can be supplied to one nozzle but also a problem that the nozzle can not be completely burned when too much amount is supplied to one nozzle. That is, the reason for forming a plurality of nozzles is to maximize processing capacity while completely burning toluene.

In order to increase the combustion efficiency of the toluene gas described above, an argon gas injection port is formed in a tangential direction to form a vortex when the irrigation gas is injected, a plasma formed in the discharge tube forms a vortex and rises to the slot while rotating, And the toluene gas inlet is formed to be inclined in the tangential direction according to the vortex forming direction of the rising plasma so that the combustion efficiency and the combustion amount of toluene can be increased.

Argon gas can be used as a substitute for other gases that can generate plasma.

As shown in FIG. 2, the toluene gas inlet may be installed at a lower portion or an upper portion of the discharge tube, and more specifically, a plurality of portions may be provided under the argon gas inlet (43 in FIG. 2), the lower portion of the slot, and the chamber side (37 in FIG. 2).

When the fuel gas is used only with the toluene gas, a red flame is generated. However, when the toluene is decomposed by the plasma using the plasma, the plasma appears as a bluish white plasma. This means that it is close to complete combustion or complete combustion.

In the experiment according to the present invention, a magnetron having an output of 1 Kw for use in a domestic microwave oven is applied, and a modification can be applied according to the size and capacity of the microwave plasma and the flame amplification chamber according to the present invention.

The 3-stub is inserted into the waveguide at regular intervals so as to be variable in length at a certain distance from the load, and the length of the 3-stub is varied to match the load impedance, To the mobile station.

A waveguide consists of hollow conductors and serves to transfer microwaves to the chamber at low losses.

A chamber (39 in FIG. 2) in which a slot (38 in FIG. 2) is provided in the center of the interior is a device for plasma flame amplification, which passes through a slot (38 in FIG. 2) A toluene gas inlet (tap angle = 20 ° to 30 °) having eight tangential directions for introducing toluene gas was formed at a portion in contact with the vertically elongated hole in the four-directional slot to maximize the toluene gas treatment capacity .

When a vortex is formed and the plasma is burned while being rotated, the time or distance of contact between the plasma and the toluene gas can be increased to induce complete combustion.

In addition, the reason for forming the vortex is that the flame is swirled upwards (for example, a tornado), so that the efficiency of toluene combustion can be greatly increased.

The tap angle (20 ° to 30 °) is the angle at which the toluene gas inlet is formed in accordance with the vortex formation direction of the rising plasma, and this angle can also be changed.

The sizes tested for the present invention are as follows, which is only one example, and those skilled in the art can modify the size, shape, and processing capacity using the present invention.

Chamber size: 135H × 140W mm

Toluene gas inlet size: 70H x 3W mm, tangential direction

Gas supply nozzle: 1/4 to 3/4 inch tab, 35 °

In addition, the ignition rods (41 in FIG. 2) used to supply the initial electrons when generating the plasma, and the discharge tubes for generating the plasma used quartz tubes having the characteristics of having low thermal expansion coefficient and high durability at high temperature. And a cooling fan (31 in FIG. 2) for cooling the heat generated by the magnetron for a long time.

A number of toluene adsorption towers for toluene adsorption were installed to adsorb and remove toluene, which is harmful to the human body, which is generated in the coating process and various coating processes. When the adsorbed amount exceeds the set value, the toluene adsorption tower is heated to the set temperature, And may be configured to be desorbed from the adsorbent and conveyed and supplied to the discharge tube and / or the chamber.

The adsorption reactor for adsorbing toluene is configured to repeatedly perform adsorption and desorption, and a valve for controlling gas supply may be provided on one side of the pipe to transfer and supply the toluene gas desorbed to the chamber only at the time of desorption.

Further, when designing the apparatus according to the present invention, a valve for controlling the transfer of the gas may be provided at one side of the pipe as required.

In addition, the present invention is configured to pass through a toluene decomposition catalyst packed column filled with a toluene decomposition catalyst to remove residual toluene remaining in the chamber (see FIG. 1).

Toluene decomposition catalyst The toluene decomposition catalyst packed in the packing tower can be produced by preparing a metal material such as rhodium (Rh), Pt (platinum), or palladium (Pd) having excellent efficiency in the form of granules having a large surface area such as zeolite or activated carbon, Immersed in a solution in which a metal material is dissolved, and then taken out, followed by drying and firing.

The amount of rhodium (Rh), Pt (platinum), or palladium (Pd) carried on the carrier is preferably 0.1 wt% to 5 wt% in consideration of economy and efficiency.

A toluene decomposing catalyst is installed on the outside or inside of the filling tower so that a heating device capable of heating at about 150 to 350 ° C is fixedly installed and can be heated and maintained at a set temperature between 150 ° C and 350 ° C.

The toluene decomposition catalyst prepared as described above was packed in a toluene decomposing catalyst filling tower. The toluene decomposing catalyst thus prepared was burnt in a plasma chamber through a gas inlet provided at an upper portion of the chamber while being heated to a temperature set by a heating device, As shown in Fig.

The present invention relates to a toluene adsorption tower filled with a toluene adsorbent for adsorbing and adsorbing toluene gas generated during a coating process and various coating processes in order to more efficiently process toluene, and the toluene adsorbed on the toluene adsorption tower is heated A toluene combustion catalyst which is configured to desorb the adsorbed toluene and pass through a discharge tube that generates plasma using a microwave to pass through a discharge tube and to pass through a toluene decomposition catalyst packing tower to decompose and remove residual toluene, A decomposition apparatus is provided so that a large amount of toluene gas can be rapidly decomposed by the combustion, so that the possibility of industrial use is very high.

11; Toluene inlet 12; Toluene adsorption tower
13; Toluene adsorbent 14; Suction fan
15; Piping 16; Microwave generating device
17; A discharge tube 18; chamber
19; Flame 20; Gas inlet
21; Piping 22; Suction fan
23; A toluene cracking catalyst filling tower 24; Toluene decomposition catalyst
31; A cooling fan 32; Transformer
33; Magnetron 34; Microwave launcher
35; 3-stove 36; wave-guide
37; Toluene gas inlet 38; slot
39; Chamber 40; Sliding shot
41; Ignition rod 42; Argon gas inlet
43; A toluene gas inlet 44; Discharge tube (quartz tube)

Claims (13)

In the toluene combustion and decomposition apparatus,
A toluene adsorption tower filled with a toluene adsorbent for adsorbing and adsorbing toluene gas present in the air during the coating process and various coating processes;
A means for desorbing the adsorbed toluene by heating the toluene filled in the toluene adsorption tower to a predetermined temperature;
A suction fan connected to the toluene adsorption tower through a pipe and injecting the desorbed toluene into a plasma discharge tube for generating a plasma;
A plasma discharge tube and a chamber connected to the toluene adsorption tower by piping for burning and decomposing toluene injected by the suction fan; And
And a toluene decomposition catalyst filling tower for decomposing and removing toluene by sucking the gas passing through the discharge tube and the chamber to decompose and remove residual toluene after combustion and decomposition while passing through the discharge tube and the chamber. delete The method according to claim 1,
Wherein the toluene combustion and decomposition apparatus is produced in the form of granules by using zeolite or activated carbon having a large surface area as a filler to be filled in a toluene adsorption tower. The method according to claim 1,
Wherein the toluene combustion and decomposition apparatus is provided with an ignition rod on one side of the inside of the discharge tube for initial ignition. The method according to claim 1,
Wherein the toluene combustion and decomposition apparatus comprises a plurality of toluene gas inlet ports formed by selecting at least one of a side surface of the chamber, a lower portion of the slot, and a lower portion of the discharge tube to increase the combustion decomposition capacity of the toluene gas as much as possible. And a decomposition device. The method according to any one of claims 1 and 3 to 5,
Wherein the toluene combustion and decomposition apparatus further comprises a wave guide launcher and a 3-stove tuner to minimize transmission loss when the microwave generated in the magnetron is transmitted to a discharge tube for generating plasma. The method of claim 6,
Wherein the argon gas inlet is inclined in a tangential direction so as to form a vortex when the argon gas is injected in order to increase the combustion efficiency when the plasma and the toluene gas generated in the plasma discharge tube are mixed and combusted, And a decomposition device. The method of claim 6,
Wherein the toluene gas inlet and the toluene gas inlet are inclined in a tangential direction so that a vortex can be formed by aligning the toluene gas inlet formed in the chamber and the bottom of the slot with the vortex direction formed when the argon gas is injected. Combustion and decomposition apparatus. delete The method of claim 6,
The slot is formed in a cylindrical shape, and a plurality of holes are formed in the upper and lower sides to induce complete combustion on the side surface. Toluene combustion, in which the toluene gas injected into the plurality of toluene gas injection holes formed on the side of the chamber is injected into a plurality of holes, Decomposition device. The method according to claim 1,
The toluene decomposition catalyst packed in the toluene decomposition catalyst packing tower may be prepared by preparing a metal material selected from one of rhodium, platinum and palladium in the form of granules with a large surface area containing zeolite or activated carbon, And then drying and firing the toluene combustion product. The method of claim 11,
Wherein the toluene decomposing catalyst filling tower further comprises a heating device for passing decomposing treatment of residual toluene through a gas while being heated to a predetermined temperature between 150 ° C and 350 ° C. The method according to claim 1 or 3,
Wherein the toluene adsorption tower further comprises a heating device for heating the toluene adsorbent to desorb and desorb the toluene adsorbed on the adsorbent by a predetermined temperature.

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