KR101926171B1 - Apparatus for recovering volatile organic solvent - Google Patents

Abstract

The present invention relates to an apparatus for recovering volatile organic solvent. The apparatus for recovering volatile organic solvent is an apparatus for recovering volatile organic solvent contained in an exhaust gas discharged from the exhaust. The apparatus includes a first recovery part for condensing and recovering the organic solvent contained in inflowing exhaust gas in a direct contact system using a low temperature solvent; and a second recovery part which is connected to the first recovery part through a first line and a second line, and adsorbing and concentrating residual organic solvent remaining in the exhaust gas flowing through the first line by using an adsorbent. The second recovery part desorbs the adsorbed organic solvent. A gas (desorbing gas) containing the desorbed organic solvent flows from the second recovery part to the first recovery part through the second line, and is liquefied and condensed. It is possible to increase the recovery rate of the volatile organic solvent.

Description

[0001] APPARATUS FOR RECOVERING VOLATILE ORGANIC SOLVENT [0002]

TECHNICAL FIELD The present invention relates to a volatile organic solvent recovery apparatus, and more particularly, to a volatile organic solvent recovery apparatus using a condensation recovery system and an adsorption concentration system.

Organic solvents are liquid organic chemicals that can dissolve certain materials such as thinner and solvent. It is characterized by high volatility, and it can also exist in the form of noxious gas in the air. If it is absorbed into human body through skin or respiratory tract, it will cause poisoning of organic solvent which causes nerve, respiratory, digestive and various organs. Therefore, it is necessary to install various safety facilities such as ventilator, It is mandatory.

Volatile organic compounds generated from large-scale domestic plants using organic solvents have achieved considerable achievements in air pollution control through voluntary efforts to strengthen the government's ongoing regulatory standards and corporate image. However, Volatile Organic Compounds (VOCs) are released into the atmosphere without any preventive facilities and are subject to enforced regulations and voluntary management due to the small size of the business.

Organic solvents used for washing include perchlorethylene (PCE) and petroleum-based solvents. Domestic laundry dryers use petroleum solvents as cleaning solvents in at least 95%. In the case of washing using petroleum solvent, a transfer method in which washing and desizing are carried out in one machine and then the laundry is transferred to another machine and dried is widely used in Korea. Accordingly, when the laundry is moved and dried, the solvent remaining in the fabric is volatilized into the atmosphere. Especially, when a solvent recovery facility or a preventive facility is not installed in the drying process, a large amount of organic solvent may be released to the atmosphere .

In accordance with Article 6 of the Enforcement Ordinance of the Sanitary Management Act, a washing machine with a treatment capacity of 30 kg or more is required to install a washer dryer. However, explosion and fire accidents have been reported, It is known that there are not many practical shops because maintenance is difficult due to lack of management guidelines. In addition, general dry cleaners except for large-scale dry cleaners are less than the management standards, and most of them do not have dryers and volatilization of organic solvents causes periodic replenishment of laundry, resulting in economic loss. In particular, these businesses are located adjacent to residential areas, which can cause direct health damage to workers as well as the general public due to volatile organic solvents.

Conventionally, an evaporator is disposed inside a closed space, and air containing an organic solvent generated on the dryer side is indirectly supplied to the evaporator side (heat exchanger side) by a refrigeration cycle comprising a compressor, a condenser, a capillary tube and an evaporator And is capable of contacting and condensing and recovering the organic solvent. In the case of such an organic solvent recovery unit, most of the organic solvent recovery efficiency is low because heat exchange efficiency is poor due to indirect heat exchange using a cooling coil. Therefore, there is a problem that some organic solvent-containing air is directly discharged into the atmosphere.

The inventors of the present invention have studied for a long time to solve these problems, and after trial and error, have come to complete the present invention.

An embodiment of the present invention provides a volatile organic solvent recovery apparatus capable of minimizing the amount of volatile organic solvent discharged into the atmosphere and increasing the recovery rate.

On the other hand, other unspecified purposes of the present invention will be further considered within the scope of the following detailed description and easily deduced from the effects thereof.

The apparatus for recovering volatile organic solvent contained in the exhaust gas discharged from the discharge side of the apparatus according to the embodiment of the present invention is a device for directly recovering the volatile organic solvent contained in the discharged exhaust gas, A first recovery unit for condensing and recovering the organic solvent; And a second recovery unit connected to the first recovery unit through the first line and the second line for adsorbing and concentrating residual organic solvent remaining in the exhaust gas flowing through the first line by using an adsorbent (Desorption gas) containing the desorbed organic solvent flows from the second collecting section to the first collecting section through the second line and is liquefied (desorbed) from the second collecting section to the first collecting section, and the second recovering section desorbs the adsorbed organic solvent, Can be condensed.

The second collecting unit may use waste heat of the exhaust gas discharged from the discharge side as a heat source for desorption of the adsorbed organic solvent.

And a vacuum pump placed on the second line, and the second recovering part can detach the adsorbed organic solvent by keeping the inside of the vacuum pump in a reduced pressure state.

An inlet line for introducing the exhaust gas discharged from the discharge side into the first recovery section; A heat exchanger disposed in the inflow line; And an outside air inflow line that receives heat from the heat exchanging unit and introduces high temperature outside air into the second collecting unit, wherein the second collecting unit is configured to discharge the inside of the room by decompression by the high temperature outside air and the vacuum pump And a low-temperature decompression desorbing environment for desorbing the adsorbed organic solvent.

And a pretreatment unit for filtering the particulate matter, wherein the exhaust gas flowing into the first recovery unit may be introduced into the first recovery unit through the pretreatment unit.

Wherein the second collecting unit includes a first adsorption / desorption module and a second adsorption / desorption module, wherein a desorption process is performed in the second module when the adsorption process is performed in the first module, The adsorption process can be performed in the second module.

This technology can increase the recovery rate of volatile organic solvent while minimizing the amount of volatile organic solvent discharged into the atmosphere.

In addition, this technology can recover high purity organic solvent.

In addition, this technology makes it possible to design the volatile organic solvent recovery device more compactly.

In addition, this technology proposes an energy efficient organic solvent recovery device structure by utilizing the waste heat of exhaust gas.

1 is a diagram showing a schematic operation of a volatile organic solvent recovery device according to an embodiment of the present invention.
2 is a diagram showing a detailed configuration of a volatile organic solvent recovery device according to an embodiment of the present invention.
3 is a diagram showing a detailed configuration of a volatile organic solvent recovery device according to another embodiment of the present invention.
4 is a diagram showing a detailed configuration of a volatile organic solvent recovery device according to another embodiment of the present invention.
It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Hereinafter, the most preferred embodiment of the present invention will be described. In the drawings, the thickness and the spacing are expressed for convenience of explanation, and can be exaggerated relative to the actual physical thickness. In describing the present invention, known configurations irrespective of the gist of the present invention may be omitted. It should be noted that, in the case of adding the reference numerals to the constituent elements of the drawings, the same constituent elements have the same number as much as possible even if they are displayed on different drawings.

1 is a diagram showing a schematic operation of a volatile organic solvent recovery apparatus 100 according to an embodiment of the present invention.

1, a volatile organic solvent recovery device 100 (hereinafter, referred to as a "recovery device" or an "organic solvent recovery device" for convenience of explanation) includes a portion for recovery of condensate and a portion ≪ / RTI >

The exhaust gas discharged from the discharge side contains a volatile organic solvent. The exhaust gas also contains small amounts of impurities, particulate matter and moisture.

The discharge side may be, for example, a formulation of paint such as paint, electronics / metal product / machinery cleaning, printing, dry cleaning, or a laundry dryer. In the present invention, it is assumed that the discharge side is a laundry dryer for convenience of explanation, but the present invention is not limited thereto.

When the exhaust gas flows into the recovery apparatus 100, the volatile organic solvent contained in the exhaust gas is recovered through the condensation recovery process and the adsorption and concentration process. Then clean air (clean air) is sent out.

The condensation recovery process is a process of condensing and recovering the organic solvent contained in the exhaust gas by a direct contact method using a low-temperature solvent.

The adsorption and concentration process is a process of recovering the organic solvent contained in the exhaust gas by an adsorption method using an adsorbent.

According to the embodiment of the present invention, the gas (desorption gas) is re-introduced into the condensation recovery process from the adsorption concentration process, and the condensation recovery process is performed again. To this end, a desorption process for desorbing the organic solvent adsorbed on the adsorbent is accompanied.

The condensation recovery process and the adsorption condensation process are largely resumed, and the condensation recovery process is carried out again through the desorption process.

According to the embodiment of the present invention, the amount of the volatile organic solvent discharged into the atmosphere can be minimized and the recovery rate can be increased. Hereinafter, the present invention will be described in more detail with reference to FIG. 2 to FIG.

2 is a diagram showing a detailed configuration of a volatile organic solvent recovery apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 2, the apparatus 100 for collecting a volatile organic solvent according to an embodiment of the present invention includes a first collecting unit 120 and a second collecting unit 130.

The first collecting unit 120 collects and recovers the organic solvent contained in the exhaust gas in direct contact with the low temperature solvent.

The low temperature solvent may include water, ethylene glycol, and the like.

The condensation recovery process by the first recovering unit can bring the organic solvent contained in the exhaust gas into high-efficiency liquefaction and recovery by bringing the organic solvent into direct contact with the low-temperature solvent through heat exchange. In this case, the temperature of the low-temperature solvent is about -10 ° C, and a cooling device such as a chiller may be provided for this purpose.

In addition, other impurities such as water contained in the exhaust gas are mixed with the low temperature solvent and separated from the organic solvent, so that the organic solvent having high purity can be recovered.

The second recovery unit 130 uses the adsorbent (not shown) to adsorb and concentrate residual organic solvent remaining in the exhaust gas.

That is, the residual organic solvent that has not been recovered while being passed through the first recovery section is adsorbed and recovered using an adsorbent such as activated carbon.

The two-stage recovery process through the first and second recovery sections minimizes the amount of organic solvent discharged into the atmosphere.

After the adsorption, the organic solvent adsorbed on the adsorbent is desorbed using a desorption process. The desorption process is performed in the second recovery unit 130.

According to the embodiment of the present invention, the desorption process can be performed in the second recovery unit by the low-temperature decompression method.

The gas (desorbing gas) containing the organic solvent desorbed through the desorption process flows into the first collecting unit 120.

The desorbed gas flowing into the first recovery section is condensed and recovered in direct contact with the low temperature solvent. That is, the organic solvent contained in the desorbed gas is once again condensed and recovered. As a result, the recovery rate of the organic solvent can be increased.

According to an embodiment of the present invention, the desorbing gas passed through the first collecting section can also be introduced into the second collecting section 130, and the residual organic solvent, which has not been recovered while passing through the first collecting section, . This further minimizes the amount of organic solvent discharged into the atmosphere.

The first collecting unit 120 and the second collecting unit 130 according to the embodiment of the present invention are connected through the first line L1 and the second line L2.

The first line L1 and the second line L2 may be configured in the form of a pipe through which exhaust gas or desorbing gas can flow. The lines are the path of the exhaust gas or desorption gas.

Specifically, the first line L1 forms a movement path of the exhaust gas flowing from the first collecting unit 120 to the second collecting unit 130, the second line L2 forms a path of the exhaust gas flowing from the second collecting unit 130, The flow path of the desorbing gas flowing from the first recovery unit 120 to the first recovery unit 120 is formed.

To this end, the first line (L1) extends from the first collecting section to the second collecting section. In FIG. 2, since the second recovery unit includes two absorption / desorption modules 132 and 134, the first line may be branched into two lines and then extended to the absorption / desorption modules, respectively. The branch point is indicated by N1 in the drawing.

And the second line L2 extends from the second collecting portion to the first collecting portion. Similarly, in FIG. 2, since the second recovery unit is composed of two absorption / desorption modules, the two lines of the second line extended from the two absorption / desorption modules are merged into one line and then extended to the first recovery unit can do. The junction point is denoted as N2 in the figure.

A pump P may be disposed in the second line L2.

The pump P may be arranged in the second line at a point after the two lines of the second line are merged.

The pump P may be a vacuum pump.

The vacuum pump P serves to constitute the second recovery part in a reduced pressure environment (for example, a vacuum environment) for detachment as described later and to transfer the desorption gas from the second recovery part to the first recovery part can do.

The condensation recovery process by the first recovery unit 120 is performed in the condensation recovery area CR and the adsorption and concentration process by the second recovery unit 130 is performed in the adsorption recovery area AR, Then, after the desorption process of the adsorbed organic solvent is performed in the adsorption recovery area AR, another recovery process for increasing the recovery rate of the organic solvent is performed in the condensation recovery area CR.

The first recovery unit may be a condensation tower, and the second recovery unit may be a suction / desorption unit.

2, the recovery apparatus 100 according to the embodiment of the present invention may further include an inflow line Li for inflow of the exhaust gas discharged from the discharge side (see FIG. 1).

In addition, the recovery apparatus 100 may further include a pre-processing unit 110 for filtering particulate matter. The preprocessing unit 110 may be disposed on the inflow line Li.

Therefore, the exhaust gas discharged from the discharge side flows into the first recovering portion 120 through the pretreatment portion 110, so that the particulate matter contained in the exhaust gas can be pre-filtered. The pretreatment unit 110 can recover organic solvents having higher purity.

In addition, the recovery apparatus 100 according to the embodiment of the present invention may further include a discharge line (Lo) for discharging the organic solvent-recovered gas to the outside.

In addition, the recovery device 100 may further include a manned fan 140. The attracting fan 140 may be disposed on the discharge line Lo.

Therefore, the exhaust gas passing through the condensation recovery process and the adsorption and concentration process can be attracted by the induction fan 140 and can be discharged to the atmosphere.

Further, the organic solvent detecting sensor S may be disposed further on the discharge line Lo. The organic solvent detection sensor S detects the organic solvent contained in the gas discharged to the outside through the discharge line Lo and allows the user to confirm the result of the detection so that the recovery rate can be monitored by the organic solvent recovery device can do.

2, the recovery apparatus 100 according to the embodiment of the present invention may further include an organic solvent recovery line Lr.

The organic solvent recovery line (Lr) is connected to the first recovery unit (120). The organic solvent recovery line (Lr) extends outward from the first recovery unit (120). The organic solvent recovery line Lr discharges the organic solvent liquefied in the first recovery unit 120 to the outside.

The organic solvent recovery line Lr may be configured in the form of a pipe through which the liquid can flow.

The recovery device 100 according to the embodiment of the present invention may further include an outside air inflow line La.

The outside air inflow line La is connected to the second recovery unit 130. The outside air inflow line La extends outward from the second collecting portion 130. The outside air inflow line La collects ambient air and flows into the second recovery unit 130.

The outside air inflow line La can be configured in the form of a pipe through which gas can flow.

In other words, the exhaust gas discharged from the discharge side flows into the first recovering part 120 through the inflow line Li, and the first recovering part 120 removes the organic solvent from the first line, And then flows into the second recovery unit 130 through the first passage L1. At this time, the organic solvents (VOCs) recovered by the first recovery unit 120 may be discharged to the outside through the organic solvent recovery line Lr.

Subsequently, the exhaust gas entering the adsorption recovery stage is discharged to the atmosphere through the exhaust line (Lo) after a part of the organic solvent is secondarily recovered.

As a result, the exhaust gas can be discharged to the atmosphere in a clean air state in which the amount of the organic solvent is minimized as a result of the primary and secondary recovery.

Then, the organic solvent adsorbed by the second recovery section 130 is desorbed and introduced into the condensation recovery stage through the second line L2, whereby liquefaction can be recovered. Similarly, the organic solvents (VOCs) that have recovered liquefied can be discharged to the outside through the organic solvent recovery line (Lr). Thereby, the recovery rate of the organic solvent can be increased.

In this process, outside air may be introduced into the second recovery unit 130 through the outside air inflow line La for desorption of the adsorbed organic solvent, and the inside of the second recovery unit 130 may be desorbed Environment.

Meanwhile, the desorbing gas introduced into the first collecting section may be introduced into the second collecting section through the first line in a state in which a part of the organic solvent has been recovered. In the desorbing gas in the second collecting section, And then discharged to the atmosphere through the discharge line.

In the above description, it is assumed that the second recovery section includes two absorption / desorption modules and the two absorption / desorption modules perform the same operation, but they may alternatively perform different operations. For example, when the first adsorption / desorption module 132 performs the adsorption process, the second adsorption / desorption module 134 can perform the desorption process. It could be the opposite, of course. This will be described in more detail with reference to FIG.

3 is a diagram showing a detailed configuration of a volatile organic solvent recovery apparatus 200 according to another embodiment of the present invention.

Referring to FIG. 3, the organic solvent recovery apparatus 200 according to another embodiment of the present invention may further include a third adsorption / desorption module 136.

The first line L1 is branched into three lines and then connected to three suction / desorption modules, and the three lines of the second line L2 are connected to three suction / 2 except that they are extended from the absorption / desorption modules and merged into a single line and then connected to the first recovery section. The following description will focus on the differences . In the present invention, three absorption / desorption modules are assumed for convenience of explanation, but the present invention is not limited thereto.

The second recovery unit 130 may include a first adsorption / desorption module 132, a second adsorption / desorption module 134, and a third adsorption / desorption module 136.

At this time, when some adsorption / desorption modules perform the adsorption process, the remaining adsorption / desorption modules can perform the desorption process. On the other hand, when some adsorption / desorption modules perform the desorption process, the remaining adsorption / desorption modules can perform the adsorption process.

Hereinafter, it is assumed that the second module 134 first performs the adsorption process, and the first and third modules 132 and 136 perform the desorption process.

The exhaust gas flows into the second module (134) of the second recovery unit (130) through the first recovery unit (120). Thus, the residual organic solvent is adsorbed by the adsorbent provided in the second module, and the cleaned air is discharged to the atmosphere through the discharge line Lo.

At this time, a valve may be disposed at the branch point N1 so that the exhaust gas passing through the first recovery unit 120 can flow into the second module 134 through the first line L1. In one example, the valve closes the path from the first collecting section to the first module and closes the path from the first collecting section to the third module, but only the path from the first collecting section to the second module .

In the same manner, a valve disposed in the discharge line Lo may also be involved so that the exhaust gas past the second recovery section 130 can be discharged to the atmosphere through the discharge line Lo. In one example, the valve closes the path from the first module to the attracting fan and closes the path from the third module to the attracting fan, but only the path from the second module to the attracting fan.

At the same time, the desorption process is performed in the first and third adsorption / desorption modules 132 and 136. The outside air flows into the first and third modules through the outside inflow line La and the inside of the first and third modules is formed into a low temperature depressurized state by the pump P or the like, The organic solvent adsorbed on the adsorbent is desorbed.

At this time, the valves may be disposed at the confluence N2 of the three lines of the second line so that the reduced pressure state is formed only in the first and third modules. In one example, the valve may open the path from the first module to the pump and the path from the third module to the pump, but close the path from the second module to the pump.

Thus, the desorbing gas containing the organic solvent desorbed from the first and third modules may be introduced into the first recovering part 120 along the second line, and liquefied and recovered.

As the above operations are continued, when a large amount of the organic solvent is adsorbed to the adsorbent provided in the second module, an operation opposite to the above processes can be performed. That is, in the second module, the desorption process is performed by the flow along the second line, and in the first and third modules, the adsorption process can be performed by the flow along the first line. Then, when a large amount of organic solvent is adsorbed in the first and third modules, the adsorption process is performed in the second module, and the desorption process can be performed in the first and third modules.

In order for the adsorption process and the desorption process to occur alternately between the modules, the modules may include a sensing section for identifying the breakthrough point of the internal adsorbent. In the case where the adsorption is continued, it is possible to control the transition from the adsorption process to the desorption process when the adsorbent breaks down and the adsorption efficiency of the organic solvent decreases, that is, when the discharge of the organic solvent in the discharge gas starts.

4 is a diagram showing a detailed configuration of a volatile organic solvent recovery apparatus 300 according to another embodiment of the present invention.

In FIG. 4, only one adsorption / desorption module of the second recovery unit is shown. However, as described above, the module carries out the adsorption process, and then the adsorbed organic solvent is desorbed and circulated to the condensation recovery stage.

When only one adsorption / desorption module is constituted in this manner, the recovery device can be made more compact.

Further, according to the embodiment of the present invention, since the exhaust gas flowing into the second recovery section is in a state in which the organic solvent has been recovered firstly in advance through the first recovering section, that is, it corresponds to the gas containing the low concentration organic solvent, The amount of adsorbent to be used can be reduced, so that it has a more advantageous structure for designing the recovery device in a compact manner.

Referring to FIG. 4, the recovery apparatus 300 according to the embodiment of the present invention may further include a heat exchange unit 150.

The heat exchanging part 150 may be, for example, a radiator. Various types of heat exchange systems can be applied and the present invention is not limited thereto.

According to the embodiment of the present invention, the heat exchanging part 150 may be disposed in the inflow line Li.

The outside air inflow line La may allow the heat discharged from the heat exchanging unit 150 to flow into the second collecting unit 130. That is, the waste heat of the exhaust gas discharged from the discharge side can be utilized as a heat source for forming the desorption environment inside the second recovery unit.

In other words, the second recovery unit 130 is configured to discharge the high-temperature outside air, which is supplied with heat from the heat exchanging unit 150 through the outside-air inflow line La, and the inside of the inside by the decompression by the vacuum pump P An environment for desorption (low-temperature decompression desorption environment) can be provided.

For example, the low temperature environment for desorption may be such that the interior of the second recovery part maintains a temperature of 60 to 90 캜. For example, it may be about 75 ° C.

And the depressurization environment for desorption may be such that the interior of the second recovery section maintains a pressure of 50 to 300 torr. For example, it can be about 100 torr.

The desorption process is performed by the low-temperature decompression desorption environment inside the second recovery unit thus formed, and the desorption gas containing the desorbed organic solvent is passed to the condensation recovery stage along the second line to be liquefied and recovered.

According to the embodiment of the present invention, the reaction environment for desorbing the organic solvent adsorbed in the second recovery section has a more energy-efficient advantage by using the waste heat of the exhaust gas.

According to the embodiment of the present invention, the recovery rate of the volatile organic solvent can be increased while minimizing the amount of the organic solvent discharged into the atmosphere, and the organic solvent having high purity can be recovered. This makes it possible to design a more compact organic solvent recovery device.

It is to be noted that the technical spirit of the present invention has been specifically described in accordance with the above-described preferred embodiments, but it is to be understood that the above-described embodiments are intended to be illustrative and not restrictive. In addition, it will be understood by those of ordinary skill in the art that various embodiments are possible within the technical scope of the present invention.

100, 200, 300: Volatile organic solvent recovery device
110:
120: First recovery unit
130: 2nd recovery unit
140: Fun Fan
150: heat exchanger
CR: condensation recovery area
AR: adsorption recovery area
L1: first line
L2: second line

Claims (6)

An apparatus for recovering a volatile organic solvent contained in an exhaust gas discharged from a discharge side,
A first recovery unit for condensing and recovering the organic solvent contained in the introduced exhaust gas in a direct contact system using a low temperature solvent; And
And a second recovery unit connected to the first recovery unit through the first line and the second line for adsorbing and concentrating residual organic solvent remaining in the exhaust gas flowing through the first line using an adsorbent, ,
The second recovery unit desorbs the adsorbed organic solvent,
(Desorbing gas) containing the desorbed organic solvent flows from the second recovering unit to the first recovering unit through the second line and is liquefied and condensed,
And a vacuum pump disposed on the second line,
Wherein the second recovery unit removes the adsorbed organic solvent by maintaining the interior of the second recovery unit in a reduced pressure state by the vacuum pump,
An inlet line for introducing the exhaust gas discharged from the discharge side into the first recovery section;
A heat exchanger disposed on the inflow line; And
And an outside air inflow line for receiving heat from the heat exchanging unit and introducing high temperature outside air into the second collecting unit,
Wherein the second recovery unit is configured to decompress the interior of the high temperature outdoor air and the vacuum pump to a low temperature decompression desorbing environment for desorbing the adsorbed organic solvent,
And a pretreatment unit disposed on the inflow line for filtering particulate matter,
And the exhaust gas discharged from the discharge side passes sequentially through the heat exchanging unit and the pre-processing unit, and flows into the first recovering unit. The method according to claim 1,
And the second recovery unit uses waste heat of the exhaust gas discharged from the discharge side as a heat source for desorption of the adsorbed organic solvent. delete delete delete The method according to claim 1,
Wherein the second recovery unit includes a first adsorption / desorption module and a second adsorption / desorption module,
The desorption process is performed in the second adsorption and desorption module when the adsorption process is performed in the first adsorption and desorption module, and the adsorption process is performed in the second adsorption and desorption module when the desorption process is performed in the first adsorption and desorption module Volatile organic solvent recovery device.

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