TW202130404A - Organic solvent recovery system - Google Patents

Abstract

In an organic solvent recovery system according to the present disclosure, a cooling and condensing device (100) comprises: a mesh-like structure (121) that separates a cooling processing gas and a condensed organic solvent by being brought into contact with an exhaust gas (G2) after cooling; and a chamber (123) that stores for a certain time period the cooling gas (G3) having passed through the mesh-like structure (121). A first pass-through flow path (F1) is installed so as to introduce a part (G4) of the cooling processing gas from a ceiling part (127) of the chamber (123) into a concentration device (300).

Description

Organic solvent recovery system

The invention relates to an organic solvent recovery system.

In the past, as a processing system for recovering organic solvent from exhaust gas containing organic solvent, a system combining a cooling and condensing device and a concentration device using an adsorption element is known. Cool the condensing device to condense and recover the organic solvent to reduce the concentration of the organic solvent in the exhaust gas. Use the concentration device of the adsorption element to make the exhaust gas whose concentration of the organic solvent discharged from the cooling and condensing device contact the adsorption element, adsorb the organic solvent, further reduce the concentration of the organic solvent in the exhaust gas, and spray the adsorbent with the organic solvent Blow high-temperature gas to desorb the organic solvent, and discharge it as a desorption gas containing a high concentration of organic solvent. The desorbed gas is sent back to the cooling and condensing device for reprocessing (refer to Patent Documents 1 and 2). [Literature Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2016-101553 Patent Document 2: Japanese Patent Laid-Open No. 2017-991

[Problems to be solved by the present invention]

In the production equipment, a certain amount of clean gas is supplied. Therefore, the exhaust gas, which is the supply gas, is discharged to the external environment. In recent years, with the worldwide emission gas control, it is required to remove organic solvents to extremely low concentrations, and high processing efficiency is required.

The purpose of the present invention is to provide an organic solvent recovery system that can recover organic solvents from exhaust gas more efficiently. [Technical means to solve the problem]

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system including: a cooling and condensing device, which cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent as the organic solvent. The cooling process gas whose solvent concentration has been reduced is discharged; the first circulation path allows a part of the cooling process gas to circulate; the concentration device is equipped with an adsorption element, and the organic contained in the cooling process gas introduced from the first circulation path The solvent is adsorbed by the adsorption element and discharged as a clean gas whose concentration of the organic solvent is further reduced. A high-temperature gas is introduced to desorb the organic solvent from the adsorption element and is discharged as a desorption gas; and the second flow path is The desorption gas is introduced into the cooling and condensing device; in the organic solvent recovery system, the cooling and condensing device is provided with: a mesh-like structure that contacts the cooled exhaust gas to condense the organic solvent and the Separation of the cooling processing gas; and a chamber for storing the cooling processing gas after passing through the mesh structure for a certain period of time; the first circulation path is set to introduce a part of the cooling processing gas from the ceiling portion of the chamber To the concentration device.

In the organic solvent recovery system, the chamber is provided with a partition that can be opposed to the exhaust direction of the cooling process gas discharged from the mesh structure to perform the suction of the first flow path.

In the organic solvent recovery system, the cooling and condensing device includes a heat exchanger that performs the cooling by heat exchange with a refrigerant.

In the organic solvent recovery system, the second circulation path has the desorption part located above the confluence position of the desorption gas and the exhaust gas.

In the organic solvent recovery system, the exhaust gas is the gas discharged from the production equipment; a return path is provided, which allows a part of the cooling process gas discharged from the first circulation path, that is, the remaining part of the cooling process gas, Return to the production facility.

In the organic solvent recovery system, the heat exchanger includes a first heat exchanger and a second heat exchanger arranged in the front stage of the first heat exchanger; the second heat exchanger will be introduced to the cooling The exhaust gas of the condensing device is cooled by heat exchange with the rest of the cooling process gas.

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system. The organic solvent is recovered from the exhaust gas containing the organic solvent discharged from the production equipment, including: a cooling and condensing device, The exhaust gas containing the organic solvent is cooled, and the organic solvent is liquefied and condensed to be discharged as a cooling processing gas whose concentration of the organic solvent has been reduced; the first circulation path allows the cooling processing gas to circulate; the first concentrating device The organic solvent contained in the cooled processing gas introduced from the first flow path is adsorbed by the first adsorption element, and discharged as a first processing gas whose concentration of the organic solvent is further reduced, and a high-temperature gas is introduced to adsorb from the first adsorption element. The element desorbs the organic solvent and discharges it as the first desorption gas; the second circulation path allows a part of the first processing gas to circulate; the second concentrating device, the first processing gas introduced from the second circulation path The organic solvent contained is adsorbed by the second adsorption element and discharged as a second processing gas whose concentration of the organic solvent is further reduced. A high-temperature gas is introduced to desorb the organic solvent from the second adsorption element as a second desorption. The attached gas is discharged; and a third circulation path is used to return the first desorbed gas and the second desorbed gas to the cooling and condensing device.

In the organic solvent recovery system, the cooling and condensing device further includes: a mesh-like structure for separating the condensed organic solvent from the cooling process gas by contacting the cooled exhaust gas; and a chamber , Storing the cooling processing gas after passing through the mesh structure for a certain period of time; the first circulation path is arranged to introduce the cooling processing gas from the ceiling portion of the chamber to the first concentrating device.

In the organic solvent recovery system, the chamber is provided with a partition that can be opposed to the exhaust direction of the cooling process gas discharged from the mesh structure to perform the suction of the first flow path.

In the organic solvent recovery system, the cooling and condensing device further includes a heat exchanger that performs the cooling by heat exchange with a refrigerant.

The organic solvent recovery system further includes a return path for returning part of the first processing gas discharged from the second circulation path, that is, the remaining part of the first processing gas, to the production equipment.

In the organic solvent recovery system, the heat exchanger includes a first heat exchanger and a second heat exchanger arranged in the front stage of the first heat exchanger; the second heat exchanger will be introduced to the cooling The exhaust gas of the condensing device is cooled by heat exchange with the rest of the first processing gas.

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system. The organic solvent is recovered from the exhaust gas containing the organic solvent discharged from the production equipment, including: a cooling and condensing device, The exhaust gas containing the organic solvent is cooled, and the organic solvent is liquefied and condensed, and the cooling process gas whose concentration of the organic solvent has been reduced as the exhaust gas is discharged; the cooling gas circulation path allows the cooling process gas to circulate; concentrating device , The organic solvent contained in the cooling processing gas introduced from the cooling gas flow path is adsorbed by the adsorption element, and discharged as processing gas whose concentration of the organic solvent is further reduced, and high temperature gas is introduced to make the organic solvent from the adsorption element The solvent is desorbed and discharged as a desorbed gas; and a desorbed gas flow path is used to introduce the desorbed gas to the cooling and condensing device.

The cooling and condensing device includes: a cooling part that allows the exhaust gas to circulate; and a separation part located on the downstream side of the cooling part when viewed along the flow direction of the exhaust gas; the separation part includes: a receiving part, Receiving the cooling condensate containing the organic solvent cooled by the cooling part; a mesh-like structure that separates the cooling condensate from the cooling processing gas by contacting the exhaust gas after cooling; and a chamber, After passing through the mesh-like structure, the cooling processing gas is stored for a certain period of time; when viewed along the flow direction of the exhaust gas, relative to the direction from the cooling part to the separation part, the separation part flows from the net The eye-shaped structure crosses the flow direction of the chamber, so that the exhaust gas flows in the L-shaped direction.

In the organic solvent recovery system, a heater for heating the cooling process gas is arranged on the downstream side of the mesh structure.

In the organic solvent recovery system, a weir is provided in the chamber to prevent the cooling condensate from flowing to the cooling gas flow path.

In the organic solvent recovery system, the concentration device includes a first concentration device and a second concentration device located on the downstream side of the first concentration device; the first concentration device introduces the cooling gas flow path into the The organic solvent contained in the cooling process gas is adsorbed by the first adsorption element, and discharged as the first process gas whose concentration of the organic solvent is further reduced, and high-temperature gas is introduced to desorb the organic solvent from the first adsorption element. The first desorption gas is discharged; the organic solvent recovery system further includes a first processing gas flow path through which a part of the first processing gas circulates; the second concentrating device introduces the first processing gas through the flow path The organic solvent contained in the first processing gas is adsorbed by the second adsorption element, and discharged as a second processing gas whose concentration of the organic solvent is further reduced, and a high-temperature gas is introduced to desorb the organic solvent from the second adsorption element, It is discharged as the second desorption gas.

In the organic solvent recovery system, the first concentrating device arranges a plurality of the first adsorption elements in the circumferential direction around the cylindrical axis of the hollow cylindrical rotating drum rotating around the cylindrical axis.

In the organic solvent recovery system, the second concentrating device arranges the second adsorption element on a disc-shaped adsorption drum rotating around a drum axis.

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system. The organic solvent is recovered from the exhaust gas containing organic solvent discharged from the production equipment. The organic solvent is equipped with a cooling and condensing device. The exhaust gas containing the organic solvent is cooled, and the organic solvent is liquefied and condensed, and discharged as a cooling processing gas whose concentration of the organic solvent has been reduced; a cooling gas circulation path allows the cooling processing gas to circulate; a first concentrating device The organic solvent contained in the cooling process gas introduced from the cooling gas flow path is adsorbed by the first adsorption element, and discharged as the first process gas whose concentration of the organic solvent is further reduced, and high temperature gas is introduced to adsorb from the first adsorption element. The element desorbs the organic solvent and discharges it as the first desorption gas; the first processing gas flow path allows a part of the first processing gas to circulate; and the second concentrating device introduces the first processing gas through the flow path The organic solvent contained in the first processing gas is adsorbed by the second adsorption element, and discharged as a second processing gas whose concentration of the organic solvent is further reduced, and a high-temperature gas is introduced to desorb the organic solvent from the second adsorption element , It is discharged as the second desorption gas; the first desorption gas is returned to the cooling and condensing device, and the second desorption gas is returned to the cooling gas flow path.

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system. The organic solvent is recovered from the exhaust gas containing organic solvent discharged from the production equipment. The organic solvent is equipped with a cooling and condensing device. The exhaust gas containing the organic solvent is cooled, and the organic solvent is liquefied and condensed, and discharged as a cooling processing gas whose concentration of the organic solvent has been reduced; a cooling gas circulation path allows the cooling processing gas to circulate; a first concentrating device The organic solvent contained in the cooling processing gas introduced from the cooling gas flow path is adsorbed by the first adsorption element, and discharged as the first processing gas whose concentration of the organic solvent is further reduced, and high temperature gas is introduced by the first heater The organic solvent is desorbed from the first adsorption element and discharged as the first desorption gas; the first processing gas flow path allows a part of the first processing gas to circulate; and the second concentrating device removes the first processing gas from the The organic solvent contained in the first processing gas introduced into the processing gas flow path is adsorbed by the second adsorption element and discharged as the second processing gas whose concentration of the organic solvent is further reduced, and the high temperature gas is introduced by the second heater. The organic solvent is desorbed from the second adsorption element and discharged as the second desorption gas; the first desorption gas is returned to the cooling and condensing device, and the second desorption gas is returned to the first Heater.

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system. The organic solvent is recovered from the exhaust gas containing organic solvent discharged from the production equipment. The organic solvent is equipped with a cooling and condensing device. The exhaust gas containing the organic solvent is cooled, and the organic solvent is liquefied and condensed, and discharged as a cooling processing gas whose concentration of the organic solvent has been reduced; a cooling gas circulation path allows the cooling processing gas to circulate; a first concentrating device The organic solvent contained in the cooling process gas introduced from the cooling gas flow path is adsorbed by the first adsorption element, and discharged as the first process gas whose concentration of the organic solvent is further reduced, and high temperature gas is introduced to adsorb from the first adsorption element. The element desorbs the organic solvent and discharges it as the first desorption gas; the first processing gas flow path allows a part of the first processing gas to circulate; the cooling condensing device return path is used to discharge the gas from the first processing gas flow path A part of the first processing gas, that is, the rest of the first processing gas, is returned to the cooling and condensing device; and a second concentrating device is contained in the first processing gas introduced from the first processing gas flow path The organic solvent is adsorbed by the second adsorption element, and discharged as a second processing gas whose concentration of the organic solvent is further reduced, and a high-temperature gas is introduced to desorb the organic solvent from the second adsorption element as a second desorption gas Discharge; the first desorption gas is returned to the cooling and condensing device, and the second desorption gas is returned to the cooling and condensing device return path.

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system. The organic solvent is recovered from the exhaust gas containing organic solvent discharged from the production equipment. The organic solvent is equipped with a cooling and condensing device. The exhaust gas containing the organic solvent is cooled, and the organic solvent is liquefied and condensed, and discharged as a cooling processing gas whose concentration of the organic solvent has been reduced; a cooling gas circulation path allows the cooling processing gas to circulate; a first concentrating device The organic solvent contained in the cooling process gas introduced from the cooling gas flow path is adsorbed by the first adsorption element, and discharged as the first process gas whose concentration of the organic solvent is further reduced, and high temperature gas is introduced to adsorb from the first adsorption element. The element desorbs the organic solvent and discharges it as the first desorption gas; the first processing gas flow path allows a part of the first processing gas to circulate; the second concentrating device introduces the first processing gas through the first processing gas flow path. The organic solvent contained in the first processing gas is adsorbed by the second adsorption element, and discharged as the second processing gas whose concentration of the organic solvent is further reduced, high temperature gas is introduced to desorb the organic solvent from the second adsorption element, It is discharged as the second desorption gas; the cooling and condensing device includes a heat exchanger that performs cooling by heat exchange with the refrigerant; the organic solvent recovery system further includes a production equipment return path, which makes the production equipment return path from the production equipment Part of the exhaust gas discharged from the equipment is returned to the production equipment after passing through the heat exchanger; the first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the production The return path of the device.

In the organic solvent recovery system, the first concentrating device arranges a plurality of the first adsorption elements in the circumferential direction around the cylindrical axis of the hollow cylindrical rotating drum rotating around the cylindrical axis.

In the organic solvent recovery system, the second concentrating device arranges the second adsorption element on a disc-shaped adsorption drum rotating around a drum axis.

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system. The organic solvent is recovered from the exhaust gas containing organic solvent discharged from the production equipment. The organic solvent is equipped with a cooling and condensing device. The exhaust gas containing the organic solvent is cooled, and the organic solvent is liquefied and condensed, and discharged as a cooling processing gas whose concentration of the organic solvent has been reduced; a cooling gas circulation path, allowing a part of the cooling processing gas to circulate; a first concentrating device , The organic solvent contained in the cooling processing gas introduced from the cooling gas flow path is adsorbed by the first adsorption element, and discharged as the first processing gas whose concentration of the organic solvent is further reduced, and the high temperature gas is introduced from the first adsorption element An adsorption element desorbs the organic solvent and discharges it as the first desorption gas; the first processing gas circulation path allows the first processing gas to circulate; and the second concentrating device introduces the first processing gas through the first processing gas circulation path. The organic solvent contained in the first processing gas is adsorbed by the second adsorption element, and discharged as the second processing gas whose concentration of the organic solvent is further reduced, high temperature gas is introduced to desorb the organic solvent from the second adsorption element, It is discharged as the second desorption gas; the cooling and condensing device includes a heat exchanger that performs cooling of the exhaust gas by heat exchange with a refrigerant; the organic solvent recovery system further includes a heat exchanger return path, the heat exchanger The return path allows part of the cooling process gas, that is, the rest of the cooling process gas, to return to the heat exchanger; to return the first desorption gas to the cooling and condensing device, and to make the second desorption gas , Return to the cooling gas flow path.

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system. The organic solvent is recovered from the exhaust gas containing organic solvent discharged from the production equipment. The organic solvent is equipped with a cooling and condensing device. The exhaust gas containing the organic solvent is cooled, and the organic solvent is liquefied and condensed, and discharged as a cooling processing gas whose concentration of the organic solvent has been reduced; a cooling gas circulation path, allowing a part of the cooling processing gas to circulate; a first concentrating device , The organic solvent contained in the cooling processing gas introduced from the cooling gas flow path is adsorbed by the first adsorption element, and discharged as the first processing gas whose concentration of the organic solvent is further reduced, and high temperature gas is introduced by a heater The organic solvent is desorbed from the first adsorption element and discharged as the first desorption gas; the first processing gas flow path allows the first processing gas to circulate; and the second concentrating device removes the first processing gas from The organic solvent contained in the first processing gas introduced in the flow path is adsorbed by the second adsorption element, and discharged as the second processing gas whose concentration of the organic solvent is further reduced, and the high temperature gas is introduced to make the second adsorption element The organic solvent is desorbed and discharged as the second desorption gas; the cooling and condensing device includes a heat exchanger that performs cooling of the exhaust gas by heat exchange with a refrigerant; the organic solvent recovery system further includes a heat exchanger return path , The heat exchanger return path makes part of the cooling process gas, that is, the rest of the cooling process gas, return to the heat exchanger; returns the first desorbed gas to the cooling and condensing device, and makes the The second desorption gas returns to the heater.

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system. The organic solvent is recovered from the exhaust gas containing organic solvent discharged from the production equipment. The organic solvent is equipped with a cooling and condensing device. The exhaust gas containing the organic solvent is cooled, and the organic solvent is liquefied and condensed, and discharged as a cooling processing gas whose concentration of the organic solvent has been reduced; a cooling gas circulation path, allowing a part of the cooling processing gas to circulate; a first concentrating device , The organic solvent contained in the cooling processing gas introduced from the cooling gas flow path is adsorbed by the first adsorption element, and discharged as the first processing gas whose concentration of the organic solvent is further reduced, and the high temperature gas is introduced from the first adsorption element An adsorption element desorbs the organic solvent and discharges it as the first desorption gas; the first processing gas circulation path allows the first processing gas to circulate; and the second concentrating device introduces the first processing gas through the first processing gas circulation path. The organic solvent contained in the first processing gas is adsorbed by the second adsorption element, and discharged as the second processing gas whose concentration of the organic solvent is further reduced, high temperature gas is introduced to desorb the organic solvent from the second adsorption element, Is discharged as the second desorbed gas; the cooling and condensing device includes a heat exchanger that performs cooling by heat exchange with the refrigerant; the organic solvent recovery system further includes a heat exchanger return path, and the heat exchanger return path causes the Part of the cooling process gas, that is, the rest of the cooling process gas, is returned to the heat exchanger; the first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the Heat exchanger return path.

According to one aspect of the organic solvent recovery system disclosed in the present invention, it is an organic solvent recovery system. The organic solvent is recovered from the exhaust gas containing organic solvent discharged from the production equipment. The organic solvent is equipped with a cooling and condensing device. The exhaust gas containing the organic solvent is cooled, and the organic solvent is liquefied and condensed, and discharged as a cooling processing gas whose concentration of the organic solvent has been reduced; a cooling gas circulation path, allowing a part of the cooling processing gas to circulate; a first concentrating device , The organic solvent contained in the cooling processing gas introduced from the cooling gas flow path is adsorbed by the first adsorption element, and discharged as the first processing gas whose concentration of the organic solvent is further reduced, and the high temperature gas is introduced from the first adsorption element An adsorption element desorbs the organic solvent and discharges it as the first desorption gas; the first processing gas circulation path allows the first processing gas to circulate; and the second concentrating device introduces the first processing gas through the first processing gas circulation path. The organic solvent contained in the first processing gas is adsorbed by the second adsorption element, and discharged as the second processing gas whose concentration of the organic solvent is further reduced, high temperature gas is introduced to desorb the organic solvent from the second adsorption element, Is discharged as the second desorption gas; the cooling and condensing device includes a heat exchanger that performs cooling by heat exchange with the refrigerant; the organic solvent recovery system further includes: a heat exchanger return path to cool the treated gas Part of the gas, that is, the remaining part of the cooling process gas, is returned to the heat exchanger; and the production equipment return path, so that a part of the exhaust gas discharged from the production equipment returns to the production equipment after passing through the heat exchanger ; Make the first desorption gas return to the cooling and condensing device, and make the second desorption gas return to the return path of the production equipment.

In the organic solvent recovery system, the first concentrating device arranges a plurality of the first adsorption elements in the circumferential direction around the cylindrical axis of the hollow cylindrical rotating drum rotating around the cylindrical axis.

In the organic solvent recovery system, the second concentrating device arranges the second adsorption element on a disc-shaped adsorption drum rotating around a drum axis. [Effects of the invention]

According to the disclosure of the present invention, an organic solvent recovery system can be provided, which can recover organic solvents from exhaust gas more efficiently.

The organic solvent recovery system according to each embodiment of the present invention is described below with reference to the drawings. In the embodiments described below, when the number, number, etc. are mentioned, the scope of the present invention is not limited to the number, number, etc., except in the case of special description. There are cases where the same reference symbols are given to the same or equivalent parts without repeating the description. From the beginning, it is planned to appropriately combine and use the constitution of the embodiment.

[Embodiment 1A] Fig. 1 is a diagram schematically showing the configuration of the organic solvent recovery system 1A of the embodiment 1A. The organic solvent recovery system 1A is composed of a cooling and condensing device 100, a concentration device 300, a first flow path F1, and a second flow path F2.

The cooling and condensing device 100 includes a cooling unit 110, a separation unit 120 and a chamber 123. The exhaust gas G1 containing the organic solvent is cooled by passing through the cooling part 110, and the organic solvent is liquefied and condensed along with it. Then, the exhaust gas G2 is separated into the cooling condensate L1 that has been liquefied and condensed and the cooling process gas G3 whose concentration of the organic solvent is reduced by passing through the separation unit 120. Finally, a part of the cooling process gas (adsorption inlet gas) G4 is supplied to the concentrating device 300 through the chamber 123 and is discharged from the cooling condensing device 100.

The cooling means/configuration of the cooling unit 110 is not particularly limited, and there is a first heat exchanger 111 that performs cooling by exchanging heat between a refrigerant such as cooling water, cold water, salt water, and the exhaust gas. Conditions such as the cooling temperature can also be appropriately determined according to the organic solvent to be recovered.

In addition, the cooling unit 110 may also be provided with a second heat exchanger that cools the exhaust gas G1 by heat exchange between the remaining part of the processing gas (return gas) G6 and the exhaust gas G1 before the first heat exchanger 111 112. This is because the heat transfer area and the amount of refrigerant required by the first heat exchanger 111 can be reduced.

The separation means/configuration of the separation unit 120 is not particularly limited, and it has a mesh structure 121 and the like that contact the droplets and catch the droplets, such as a demister, a filter, and a mesh. The cooling condensate L1 captured by the mesh structure 121 is collected by gravity into the storage tank 125 arranged at the lower part of the mesh structure 121 and is recovered as the recovery liquid L3.

The chamber 123 is a structure with a certain volume of space. A part of the cooling process gas (adsorption inlet gas) G4 and the remaining part of the cooling process gas (return gas) G6 are allocated to the cooling process gas supplied to the concentrating device 300. The chamber 123 is provided with a partition 128 which can be opposed to the exhaust direction of the cooling process gas G3 discharged from the mesh-like structure 121 to suck in the first flow path F1.

The concentrating device 300 is provided with an adsorption element 310 including an adsorbent, and adsorbs the organic solvent contained in it by contact with the gas, and desorbs the adsorbed organic solvent by contact with the heated gas. In addition, the adsorption element 310 includes a desorption part (desorption zone) 311 and an adsorption part (adsorption zone) 312. The adsorbing part 312 introduces a part of the cooling process gas (adsorption inlet gas) G4, so that a part of the cooling process gas (adsorption inlet gas) G4 is in contact with the adsorbing material, so that a part of the cooling process gas (adsorption inlet gas) is brought into contact with the adsorbent. The organic solvent contained in G4 is adsorbed to the adsorption material, thereby cleaning a part of the cooling process gas (adsorption inlet gas) G4, and is discharged as clean gas G9.

The desorption part 311 introduces a part of the cooler process gas (adsorption inlet gas) G4 to the adsorbent gas G10, which desorbs the organic solvent from the adsorbent, thereby serving as a desorption gas containing the organic solvent G11 is discharged.

As the adsorption material contained in the adsorption element 310, activated alumina, silica gel, activated carbon material or zeolite is widely used, and activated carbon and hydrophobic zeolite are particularly suitable for use. Activated carbon and hydrophobic zeolite have a good function of adsorbing and desorbing low-concentration organic compounds, and they have been used as adsorbents in various devices.

In addition, the specific configuration of the concentrating device of the embodiment is not particularly limited. However, as shown in FIG. 1, the following configuration is known: a rotating shaft and an adsorption element 310 arranged around the rotating shaft, by making the adsorption element 310 around The rotating shaft rotates, and in the adsorption part 312, the adsorption material which adsorbs the organic solvent in a part of the cooling process gas (adsorption inlet gas) G4 is continuously moved to the desorption part 311.

In the concentration device 300 of the embodiment, as shown in FIG. This is because even when a part of the organic solvent contained in the desorption gas G11 is liquefied and condensed to produce the desorption condensate L2, the desorption condensate L2 is still difficult to adhere to the adsorption part 312. The desorption condensate L2 is dropped to a lower portion than the desorption part 311, and is recovered along the inner surface of the outside of the desorption part. In a more preferable aspect, as shown in FIG. 1, the desorption part 311 is preferably inclined downward. This is to make the desorption condensate L2 easier to drip downward.

The concentrating device 300 may also include a purge part (not shown) that moves to the adsorption part 312 after the desorption process of the desorption part 311 is completed. It may also be a configuration in which a part of the clean gas G9 is introduced to the purge section, and the purge section outlet gas discharged from the purge section is introduced to the adsorption section 312. This is because by purging the desorbed adsorbent with the clean gas G9, the desorption gas G11 remaining in the adsorbent is prevented from mixing into the clean gas G9, and the adsorbent can be cooled.

The concentrating device 300 is used for the desorption of the high temperature gas G10, and it is preferable to use heating means such as the regeneration heater 350 to make a part of the clean gas G9 into a high temperature state. This is because the adsorption part 312 does not increase the processing air volume of the organic solvent-containing gas. When the temperature of the exhaust gas G1 is 50 to 200° C., it is more preferable to use the regeneration heater 350 or the like to raise a part of the exhaust gas G1. This is because the use of the high-temperature exhaust gas G1 for desorption can reduce the utility of the regeneration heater 350, and the temperature of the exhaust gas G1 eliminates the need for the regeneration heater 350 for desorption. In addition, the ratio of the exhaust gas G1 and the desorption gas G11 through the cooling and condensing device 100 is assumed to be 0%-50% for the exhaust gas G1 and 50%-100% for the desorption gas G11.

The first flow path F1 is a part where a part of the cooling process gas (adsorption inlet gas) G4 is introduced from the chamber 123 to the concentration device 300. The connection port of the first circulation path F1 to the cavity 123 is preferably the ceiling portion 127 of the cavity 123. This is to prevent the intrusion of minute liquid droplets not caught by the separation unit 120 into the concentrating device 300, and to prevent performance degradation/strength degradation caused by the wetting of the adsorbing element 310 of the concentrating device 300, which will be described later. In a more preferable aspect, a partition 128 is preferably provided to take out a part of the cooling processing gas (adsorption inlet gas) G4 in a manner opposed to the flow direction of the cooling processing gas G3. It can further prevent the intrusion of droplets. In addition, a part of the cooling process gas (adsorption inlet gas) G4 can be provided with a droplet intrusion prevention member similar to the above-mentioned mesh structure 121, or can be provided to vaporize the droplets. Heater.

The second flow path F2 is to return the desorbed gas G11 to the inlet of the exhaust gas G1 of the cooling and condensing device 100. The second flow path F2 is preferably connected in such a way that the desorption part 311 is arranged above the confluence position of the desorption gas G11 and the exhaust gas G1 supplied to the cooling and condensing device 100. This is because the desorption condensate L2 generated by the desorption gas G11 of the concentrating device 300 is easy to move to the cooling and condensing device 100. In a more preferable aspect, it is preferable to configure the cooling and condensing device 100 to circulate the discharge gas G1 and the storage tank 125 in two places. This is because the desorption condensate L2 generated by the desorption gas G11 is easily directly recovered to the storage tank 125.

The concentration device 300 of the organic solvent recovery system 1A of the embodiment uses the high-temperature gas G10 for desorption. As mentioned above, it is preferable to use heating means such as the regenerative heater 350 to make part of the clean gas G9 into a high-temperature state, but the exhaust gas G1 When the temperature is 50 to 200°C, it is more preferable to use the regenerative heater 350 or the like to raise a part of the exhaust gas G1. This is because by using high-temperature exhaust gas for desorption, the utility of the regeneration heater 350 can be reduced, and the regeneration heater 350 is not required for desorption by the temperature of the exhaust gas G1. In addition, the ratio of the exhaust gas G1 and the desorption gas G11 to the cooling and condensing device 100 is assumed to be 0%-50% for the exhaust gas G1 and 50%-100% for the desorption gas G11.

When the exhaust gas G1 is the gas discharged from the production equipment 130, it can also be a structure that returns the remaining part (return gas) G6 of the cooling processing gas to the production equipment 130.

To further reduce the concentration of the organic solvent contained in the remaining part of the cooling process gas (return gas) G6, as shown in Figure 2, an additional concentrating device for processing the remaining part of the cooling process gas (return gas) G6 can be introduced. 500. In addition, if it is desired to further reduce the concentration of the organic solvent contained in the clean gas G9, as shown in FIG. 3, a concentrating device 600 for processing the clean gas G9 may be additionally introduced. The concentrating device 500 and the concentrating device 600 may have the same configuration as the concentrating device 300 or other configurations. In addition, there is no limit to the number of additional enrichment devices introduced. The desorbed gas discharged from any of the concentrating devices is returned to the inlet of the exhaust gas G1 of the cooling and condensing device 100 via the second flow path F2.

In the embodiment, examples of the organic solvent contained in the exhaust gas G1 include organic solvents that can be liquefied and recovered by cooling at 1°C to 50°C. The organic solvent is, for example, N-methylpyrrolidone, N-ethylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, or n-decane. These etc. are only examples, and are not limited to them. The organic solvent contained may be one type or plural types.

[Embodiment 1B] Fig. 4 is a diagram schematically showing the configuration of the organic solvent recovery system 1B of the embodiment 1B. The organic solvent recovery system 1B is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various circulation paths.

The cooling and condensing device 100 includes a cooling unit 110 and a separation unit 120. The exhaust gas G1 containing the organic solvent is exhausted from the production equipment 130. The exhaust gas G1 is cooled by passing through the cooling unit 110. The exhaust gas G1 liquefies and condenses the organic solvent as it passes through the cooling unit 110.

The exhaust gas G2 passing through the cooling part 110 is separated into the cooling condensate L1 which has been liquefied and condensed and the cooling process gas G3 whose concentration of the organic solvent is reduced by passing through the separation part 120. The cooling processing gas G3 passes through the chamber 123 and is discharged from the cooling and condensing device 100 to the first concentrating device 200 as the cooling processing gas G4.

The cooling means and structure of the cooling unit 110 are not particularly limited. In Embodiment 1B, the first heat exchanger 111 that performs cooling by heat exchange between a refrigerant such as cooling water, cold water, salt water, and the exhaust gas is used. The first heat exchanger 111 is located at a position where the exhaust gas G1 circulates in the up and down direction.

The cooling unit 110 is provided before the first heat exchanger 111 with a second heat exchanger 112 that cools the exhaust gas G1 by heat exchange between the cooling process gas G6 and the exhaust gas G1 described later. The second heat exchanger 112 can reduce the heat transfer area and the amount of refrigerant required by the first heat exchanger 111. A part of the exhaust gas G1 and the cooling process gas G6 returns to the production facility 130 through the fifth flow path F5. Conditions such as the cooling temperature in the first heat exchanger 111 and the second heat exchanger 112 may be appropriately determined depending on the organic solvent to be recovered.

The separation means and structure of the separation part 120 are not particularly limited. In Embodiment 1B, a mesh-like structure 121 that contacts and captures droplets, such as a demister, a filter, and a mesh, is used. The separation part 120 includes a funnel-shaped receiving part 122, and the receiving part 122 receives the cooling condensate L1 containing the organic solvent cooled by the cooling part 110. The cooling condensate L1 cooled by the cooling part 110 and the cooling condensate L1 captured by the mesh structure 121 flow to the receiving part 122 by gravity, and then collect the liquid in the storage tank 125 arranged at the lower part of the receiving part 122 , As the recovery liquid L3 recovered.

The chamber 123 is a structure with a certain volume of space. Inside the cavity 123, a weir 124 is provided. The weir 124 prevents a part of the cooling condensate L1 from moving in the direction of the front end of the chamber 123 and flowing to the first flow path F1 as a cooling gas flow path. The weir 124 has the function of reliably recovering the cooling condensate L1. The cooling processing gas G3 stored in the chamber 123 for a certain period of time is circulated as the cooling processing gas G4 in the first circulation path F1 and supplied to the first concentration device 200.

In the organic solvent recovery system 1B, when viewed along the flow direction of the exhaust gas G1, the inside of the separation section 120 flows from the mesh structure 121 to the chamber 123 relative to the direction from the cooling section 110 to the separation section 120 The directions intersect with each other to form a structure in which exhaust gas G1 (exhaust gas G2, cooling process gas G3) flows in an L-shaped direction.

The organic solvent recovery system 1B has an L-shaped structure where the cooling unit 110 and the separation unit 120 are formed, so that the first concentrating device 200 and the second concentrating device 300 can be prevented from being exposed due to droplets and splashes. If the first concentrating device 200 and the second concentrating device 300 are exposed and the adsorbent is wetted, the strength may be reduced or damaged. The organic solvent recovery system 1B has an L-shaped structure to prevent the strength of the first concentrating device 200 and the second concentrating device 300 from being reduced or damaged.

The first concentrating device 200 includes an adsorption drum 212 containing an adsorbent, and adsorbs the organic solvent contained in it by contact with the gas, and desorbs the adsorbed organic solvent by contact with the heated gas. The adsorption drum 212 is composed of a plurality of adsorption units 210 separated by a plurality of partitions. The suction drum 212 has a hollow cylindrical shape as a whole by a plurality of suction units 210. The adsorption drum 212 is arranged in the processing chamber and arranged so that the fluid can flow in the radial direction. The suction drum 212 is configured to be rotated around the drum shaft by the rotational driving force of the motor.

In the first concentrating device 200, a part of the adsorption unit 210 constitutes an adsorption part, and the organic solvent contained in the cooling processing gas G4 supplied from the outside to the inside of the adsorption unit 210 is adsorbed; and the remaining part of the adsorption unit 210 constitutes a desorption part The organic solvent adsorbed on the adsorption unit 210 is desorbed from the adsorption unit 210 by supplying heated air from the inside to the outside of the adsorption unit 210.

At the time of cleaning, the cooled processing gas G4 supplied into the processing chamber is introduced from the outer peripheral surface of the adsorption drum 212 to the adsorption part. When the cooling processing gas G4 introduced into the adsorption part passes through the adsorption drum 212 from the outer peripheral surface to the inner peripheral surface along the radial direction, the organic solvent is adsorbed to the plurality of adsorption units 210 located in the adsorption part, thereby being cleaned.

The cleaned cooling processing gases G5 and G6 serving as the fluid to be processed are discharged from the upper portion of the adsorption unit 210 as clean gas. A part of the discharged clean gas is circulated through the second flow path F2 as the cooling processing gas G5, and is supplied to the second concentrating device 300. A part of the discharged clean gas is circulated through the fourth flow path F4 as the cooling processing gas G6, and returns to the second heat exchanger 112.

The inner circumference side flow path forming member 211 and the outer circumference side flow path forming member 213 are opposed to each other on the inner circumference side and the outer circumference side of the suction drum 212 by sandwiching a part of the suction drum 212 in the circumferential direction地Configuration. The area of the adsorption drum 212 sandwiched by the inner circumference side flow path forming member 211 and the outer circumference side flow path forming member 213 is a desorption part.

In order to perform the desorption of the organic solvent, the high-temperature gas G7, which is a part of the cooling process gas G5 heated by the regeneration heater 250, is introduced into the desorption portion from the inner peripheral side flow path forming member 211. When the high-temperature gas G7 introduced into the desorption section passes through the adsorption drum 212, the organic solvent adsorbed thereon is desorbed by heat from the plurality of adsorption units 210 located in the desorption section. The desorbed gas G8 containing an organic solvent, as a concentrated gas, is discharged from the desorbed part through the outer peripheral side flow path forming member 213 to the outside of the processing room, and returns to the third flow path F3. A part of the organic solvent contained in the desorption gas G8 is liquefied and condensed, and collected in the storage tank 125 as the desorption condensate L2.

The third flow path F3 is a part where the desorbed gas G8 and the desorbed gas G11 described later are returned to the inlet of the exhaust gas G1 of the cooling and condensing device 100. The third flow path F3 is preferably connected in such a way that the desorption part is arranged above the confluence position of the desorption gas and the exhaust gas G1 supplied to the cooling and condensing device 100. This is because the desorption condensate L2 generated by the desorption gas G8 of the first concentration device 200 and the desorption gas G11 of the second concentration device 300 is easy to move to the cooling and condensing device 100. The third flow path F3 is preferably configured to circulate both the inlet of the exhaust gas G1 of the cooling and condensing device 100 and the storage tank 125. This is because the desorption condensate L2 generated by the desorption gas G8 and the desorption gas G11 is easily recovered directly to the storage tank 125.

In the first concentrating device 200, the adsorption unit 210 located in the adsorption part is subjected to adsorption treatment of the substance to be treated, and the adsorption unit 210 located in the desorption part after the adsorption treatment is subjected to the desorption treatment of the substance to be treated. By rotating the adsorption drum 212 around the cylinder axis, the adsorption unit 210 alternately moves the desorption part and the adsorption part to continuously perform the adsorption treatment and desorption treatment of the substance to be processed.

As the material constituting the adsorption element of the adsorption unit 210, activated alumina, silica gel, activated carbon material, zeolite, etc. can be used. The shape of the adsorption element in the adsorption unit 210 is not particularly limited. For example, it may be a honeycomb-shaped sheet containing activated carbon material or zeolite, or a laminate of activated carbon fiber non-woven fabrics.

The second concentrating device 300 includes an adsorption element 310 including an adsorbent, and adsorbs the organic solvent contained in it by contact with the gas, and desorbs the adsorbed organic solvent by contact with the heated gas. The adsorption element 310 includes a desorption part (desorption zone) 311 and an adsorption part (adsorption zone) 312. The adsorption part 312 brings the cooling processing gas G5 into contact with the adsorbing material by introducing the cooling processing gas G5, thereby adsorbing the organic solvent contained in the cooling processing gas G5 to the adsorbing material, so that the cooling processing gas G5 is cleaned as a clean The gas G9 is discharged.

The desorption part 311 introduces a gas G10 that has a higher temperature than the cooling process gas G5 to the adsorption material to desorb the organic solvent from the adsorption material, thereby discharging the desorption gas G11 containing the organic solvent.

As the adsorption material contained in the adsorption element 310, activated alumina, silica gel, activated carbon material or zeolite is widely used, and activated carbon and hydrophobic zeolite are particularly suitable for use.

As shown in FIG. 4, the second concentrating device 300 includes a rotating shaft and an adsorption element 310 arranged around the rotating shaft. The second concentrating device 300 is configured as follows: by rotating the adsorption element 310 around the rotation axis, the adsorption part 312 adsorbs the organic solvent in the cooling processing gas G5 introduced from the second flow path F2. The material continuously moves to the desorption part 311.

As shown in FIG. 4, in the second concentrating device 300, it is advisable to dispose the desorption part 311 at a lower part than the adsorption part 312. This is because even when a part of the organic solvent contained in the desorption gas G11 is liquefied and condensed to produce the desorption condensate L2, the desorption condensate L2 is still difficult to adhere to the adsorption part 312. The desorption condensate L2 is dropped to a lower portion than the desorption part 311, and is recovered along the inner surface of the outside of the desorption part. In a more preferable aspect, in order to make it easier for the desorption condensate L2 to drip downward, the desorption part 311 should be inclined downward.

The second concentrating device 300 may also include a cleaning part (purge part) that moves to the adsorption part 312 after the part where the desorption process of the desorption part 311 is completed. It may also be a configuration in which a part of the clean gas G9 is introduced to the purge section, and the purge section outlet gas discharged from the purge section is introduced to the adsorption section 312. This is because by cleaning the desorbed adsorbent with the clean gas G9, the desorption gas G11 remaining in the adsorbent is prevented from mixing into the clean gas G9, and the adsorbent can be cooled.

The high-temperature gas G10 used for desorption is preferably one that uses heating means such as the regeneration heater 350 to make a part of the clean gas G9 into a high-temperature state. This is because in the adsorption part 312, the processing air volume of the organic solvent-containing gas is not increased.

[Embodiment 2B] Fig. 5 is a diagram schematically showing the configuration of an organic solvent recovery system 2B of Embodiment 2B. The organic solvent recovery system 2B is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various circulation paths. The organic solvent recovery system 2B has the same configuration as the organic solvent recovery system 1B of Embodiment 1B except for the following points: a heater 126 is installed in the chamber 123.

The heater 126 slightly heats the cooled processing gas G3 after cooling. By slightly heating the cooling process gas G3, the condensation of the organic solvent or moisture can be prevented.

[Effect] The cooling and condensing device 100 of this embodiment includes a cooling unit 110 that circulates the exhaust gas G1, and a separation unit 120 located on the downstream side of the cooling unit 110 when viewed along the flow direction of the exhaust gas G1. The separating part 120 is provided with: a receiving part 122 for receiving the cooling condensate L1 containing an organic solvent cooled by the cooling part 110; The cooling processing gas G3 is separated; and the chamber 123 stores the cooling processing gas G3 after passing through the mesh structure 121 for a certain period of time.

When viewed along the flow direction of the exhaust gas G1, with respect to the direction from the cooling section 110 to the separation section 120, the direction in which the mesh structure 121 flows to the chamber 123 in the separation section 120 is crossed, so that the The exhaust gas flows in the L-shaped direction. Thereby, the cooling condensate L1 containing the organic solvent can be recovered more efficiently from the exhaust gas G1. The organic solvent recovery system of this embodiment has an L-shaped structure where the cooling unit 110 and the separation unit 120 are formed, so that the first concentrating device 200 and the second concentrating device 300 installed in the subsequent stage can be suppressed due to droplets and droplets. The situation of exposure.

On the downstream side of the mesh structure 121 of this embodiment, a heater 126 for heating the cooling process gas G3 is arranged. Thereby, by slightly heating the cooling process gas G3, the condensation of the organic solvent or moisture can be prevented.

In the chamber 123 of this embodiment, a weir 124 is provided. Thereby, the cooling condensate L1 can be prevented from flowing to the first circulation path F1 as the cooling gas circulation path.

The concentration device of this embodiment includes a first concentration device 200 and a second concentration device 300 located on the downstream side of the first concentration device. The first concentrator 200 absorbs the organic solvent contained in the cooling process gas G4 introduced from the first flow path F1 by the adsorption unit 210, and discharges it as the cooling process gas G5 whose concentration of the organic solvent is further reduced, and introduces the high-temperature gas G7. The organic solvent is desorbed from the adsorption unit 210 and discharged as a desorption gas G8.

The organic solvent recovery system of this embodiment further includes a second flow path F2 for circulating a part of the cooling process gas G5; the second concentrating device 300 includes the organic solvent contained in the cooling process gas G5 introduced from the second flow path F2 The clean gas G9 whose concentration of the organic solvent is further reduced by the adsorption element 310 is discharged, and the high-temperature gas G10 is introduced to desorb the organic solvent from the adsorption element 310 and is discharged as the desorption gas G11.

The first concentrating device 200 of the present embodiment is arranged in plural in the circumferential direction around the drum axis of the hollow cylindrical drum that rotates the adsorption unit 210 around the drum axis. Thereby, the organic solvent can be recovered efficiently.

In the second concentrating device 300 of this embodiment, the adsorption element 310 is arranged in a disc-shaped adsorption drum that rotates around a drum axis. Thereby, the organic solvent can be recovered efficiently.

[Other embodiments] In the above embodiment, two concentrating devices, the first concentrating device 200 and the second concentrating device 300, are used. The concentration device can also use two first concentration devices 200 or two second concentration devices 300 according to the air volume. In addition, more than three concentrators can also be used according to the removal efficiency.

Examples of the organic solvent contained in the exhaust gas G1 include organic solvents that can be liquefied and recovered by cooling at 1°C to 50°C. The organic solvent is, for example, N-methylpyrrolidone, N-ethylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, or n-decane. These etc. are only examples, and are not limited to them. The organic solvent contained may be one type or plural types.

[Embodiment 1C] Fig. 6 is a diagram schematically showing the configuration of the organic solvent recovery system 1C of the embodiment 1C. The organic solvent recovery system 1C is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various circulation paths.

The cooling and condensing device 100 includes a cooling unit 110 and a separation unit 120. The exhaust gas G1 containing the organic solvent is exhausted from the production equipment 130. The exhaust gas G1 is cooled by passing through the cooling unit 110. The exhaust gas G1 liquefies and condenses the organic solvent as it passes through the cooling unit 110.

The exhaust gas G2 passing through the cooling part 110 is separated into the cooling condensate L1 which has been liquefied and condensed and the cooling process gas G3 whose concentration of the organic solvent is reduced by passing through the separation part 120. The cooling processing gas G3 passes through the chamber 123 and is discharged from the cooling and condensing device 100 to the first concentrating device 200 as the cooling processing gas G4.

The cooling means and structure of the cooling unit 110 are not particularly limited. In the first embodiment, the first heat exchanger 111 that performs cooling by exchanging heat between a refrigerant such as cooling water, cold water, or salt water, and exhaust gas is used. The first heat exchanger 111 is located at a position where the exhaust gas G1 circulates in the horizontal direction.

The cooling unit 110 is provided before the first heat exchanger 111 with a second heat exchanger 112 that cools the exhaust gas G1 by heat exchange between the cooling process gas G6 and the exhaust gas G1 described later. The second heat exchanger 112 can reduce the heat transfer area and the amount of refrigerant required by the first heat exchanger 111. A part of the exhaust gas G1 and the cooling process gas G6 returns to the production facility 130 through the fifth flow path F5. Conditions such as the cooling temperature in the first heat exchanger 111 and the second heat exchanger 112 may be appropriately determined depending on the organic solvent to be recovered.

The separation means and structure of the separation part 120 are not particularly limited. In Embodiment 1C, a mesh-like structure 121 that contacts and captures droplets, such as a demister, a filter, and a mesh, is used. The cooling condensate L1 captured by the mesh structure 121 is collected by gravity into the storage tank 125 arranged at the lower part of the mesh structure 121 and is recovered as the recovery liquid L3.

The chamber 123 is a structure with a certain volume of space. The cooling processing gas G3 stored in the chamber 123 for a certain period of time is circulated as the cooling processing gas G4 in the first circulation path F1 and supplied to the first concentration device 200. The chamber 123 is provided with a partition 128 which can be opposed to the exhaust direction of the cooling process gas G3 discharged from the mesh-like structure 121 to suck in the first flow path F1.

The first flow path F1 is a part where the cooling processing gas G4 is introduced from the chamber 123 to the first concentration device 200. The connection port of the first circulation path F1 to the cavity 123 is preferably the ceiling portion 127 of the cavity 123. Thereby, the intrusion of minute droplets not caught by the separating unit 120 into the first concentrating device 200 can be suppressed, and the performance degradation/strength degradation caused by the wetting of the adsorption unit 210 of the first concentrating device 200 described later can be prevented. In a more preferable aspect, the cooling processing gas G4 should be taken out in a manner opposite to the flow direction of the cooling processing gas G3. In this way, the intrusion of droplets can be further prevented. In addition, a droplet prevention member similar to the mesh structure 121 described above may be provided at the outlet of the cooling processing gas G4, or a heater for vaporizing the droplets may be provided.

The first concentrating device 200 includes an adsorption drum 212 containing an adsorbent, and adsorbs the organic solvent contained in it by contact with the gas, and desorbs the adsorbed organic solvent by contact with the heated gas. The adsorption drum 212 is composed of a plurality of adsorption units 210 separated by a plurality of partitions. The suction drum 212 has a hollow cylindrical shape as a whole by a plurality of suction units 210. The adsorption drum 212 is arranged in the processing chamber and arranged so that the fluid can flow in the radial direction. The suction drum 212 is configured to be rotated around the drum shaft by the rotational driving force of the motor.

In the first concentrating device 200, a part of the adsorption unit 210 constitutes an adsorption part, and the organic solvent contained in the cooling processing gas G4 supplied from the outside to the inside of the adsorption unit 210 is adsorbed; and the remaining part of the adsorption unit 210 constitutes a desorption part The organic solvent adsorbed on the adsorption unit 210 is desorbed from the adsorption unit 210 by supplying heated air from the inside to the outside of the adsorption unit 210.

At the time of cleaning, the cooled processing gas G4 supplied into the processing chamber is introduced from the outer peripheral surface of the adsorption drum 212 to the adsorption part. When the cooling processing gas G4 introduced into the adsorption part passes through the adsorption drum 212 from the outer peripheral surface to the inner peripheral surface along the radial direction, the organic solvent is adsorbed to the plurality of adsorption units 210 located in the adsorption part, thereby being cleaned.

The cleaned cooling processing gases G5 and G6 serving as the fluid to be processed are discharged from the upper portion of the adsorption unit 210 as clean gas. A part of the discharged clean gas is circulated through the second flow path F2 as the cooling processing gas G5, and is supplied to the second concentrating device 300. A part of the discharged clean gas is circulated through the fourth flow path F4 as the cooling processing gas G6, and returns to the second heat exchanger 112.

The inner circumference side flow path forming member 211 and the outer circumference side flow path forming member 213 are opposed to each other on the inner circumference side and the outer circumference side of the suction drum 212 by sandwiching a part of the suction drum 212 in the circumferential direction地Configuration. The area of the suction drum 212 enclosed by the inner flow path forming member 211 and the outer flow path forming member 213 is a desorption part.

In order to perform the desorption of the organic solvent, the high-temperature gas G7, which is a part of the cooling process gas G5 heated by the regeneration heater 250, is introduced into the desorption portion from the inner peripheral side flow path forming member 211. When the high-temperature gas G7 introduced into the desorption section passes through the adsorption drum 212, the organic solvent adsorbed thereon is desorbed by heat from the plurality of adsorption units 210 located in the desorption section. The desorbed gas G8 containing an organic solvent, as a concentrated gas, is discharged from the desorbed part through the outer peripheral side flow path forming member 213 to the outside of the processing room, and returns to the third flow path F3. A part of the organic solvent contained in the desorption gas G8 is liquefied and condensed, and collected in the storage tank 125 as the desorption condensate L2.

The third flow path F3 is to return the desorbed gas G8 to the inlet of the exhaust gas G1 of the cooling and condensing device 100. The third flow path F3 is preferably connected in such a way that the desorption part is arranged above the confluence position of the desorption gas G8 and the exhaust gas G1 supplied to the cooling and condensing device 100. With this configuration, the desorbed condensate L2 generated by the desorbed gas G8 of the first concentrating device 200 can easily move to the cooling and condensing device 100. The third flow path F3 is preferably configured to circulate both the inlet of the exhaust gas G1 of the cooling and condensing device 100 and the storage tank 125. With this configuration, the desorption condensate L2 generated by the desorption gas G8 can be easily recovered directly to the storage tank 125.

In the first concentrating device 200, the adsorption unit 210 located in the adsorption part is subjected to adsorption treatment of the substance to be treated, and the adsorption unit 210 located in the desorption part after the adsorption treatment is subjected to the desorption treatment of the substance to be treated. By rotating the adsorption drum 212 around the cylinder axis, the adsorption unit 210 alternately moves the desorption part and the adsorption part to continuously perform the adsorption treatment and desorption treatment of the substance to be processed.

As the material constituting the adsorption element of the adsorption unit 210, activated alumina, silica gel, activated carbon material, zeolite, etc. can be used. The shape of the adsorption element in the adsorption unit 210 is not particularly limited. For example, it may be a honeycomb-shaped sheet containing activated carbon material or zeolite, or a laminate of activated carbon fiber non-woven fabrics.

The second concentrating device 300 includes an adsorption element 310 including an adsorbent, and adsorbs the organic solvent contained in it by contact with the gas, and desorbs the adsorbed organic solvent by contact with the heated gas. The adsorption element 310 includes a desorption part (desorption zone) 311 and an adsorption part (adsorption zone) 312. The adsorption part 312 brings the cooling processing gas G5 into contact with the adsorbing material by introducing the cooling processing gas G5, thereby adsorbing the organic solvent contained in the cooling processing gas G5 to the adsorbing material, so that the cooling processing gas G5 is cleaned as a clean The gas G9 is discharged.

The desorption part 311 introduces a gas G10 that has a higher temperature than the cooling process gas G5 to the adsorption material to desorb the organic solvent from the adsorption material, thereby discharging the desorption gas G11 containing the organic solvent. The desorbed gas G11 passes through the sixth flow path F6 and returns to the first flow path F1.

Since the organic solvent recovery system 1C returns the desorbed gas G11 to the first flow path F1, the cooling and condensing device 100 does not need to process the air volume of the desorbed gas G11. Therefore, the organic solvent recovery system 1C can contribute to the miniaturization and energy saving of the cooling and condensing device 100. In the organic solvent recovery system 1C, since the desorption gas G11 has a high temperature, it can suppress the condensation of NMP (N-methylpyrrolidone), moisture, etc. contained in the cooling process gas G4.

As the adsorption material contained in the adsorption element 310, activated alumina, silica gel, activated carbon material or zeolite is widely used, and activated carbon and hydrophobic zeolite are particularly suitable for use.

As shown in FIG. 6, the second concentrating device 300 includes a rotating shaft and an adsorption element 310 provided around the rotating shaft. The second concentrating device 300 is configured as follows: by rotating the adsorption element 310 around the rotation axis, the adsorption part 312 adsorbs the organic solvent in the cooling processing gas G5 introduced from the second flow path F2. The material continuously moves to the desorption part 311.

The second concentrating device 300 may also include a cleaning part (purge part) that moves to the adsorption part 312 after the part where the desorption process of the desorption part 311 is completed. It may also be a configuration in which a part of the clean gas G9 is introduced to the purge section, and the purge section outlet gas discharged from the purge section is introduced to the adsorption section 312. This is because by cleaning the desorbed adsorbent with the clean gas G9, the desorption gas G11 remaining in the adsorbent is prevented from mixing into the clean gas G9, and the adsorbent can be cooled.

The high-temperature gas G10 used for desorption is preferably one that uses heating means such as the regeneration heater 350 to make a part of the clean gas G9 into a high-temperature state. By making it into a high temperature state, in the adsorption part 312, the increase of the processing air volume of the organic solvent containing gas can be suppressed.

[Embodiment 2C] Fig. 7 is a diagram schematically showing the configuration of an organic solvent recovery system 2C of Embodiment 2C. The organic solvent recovery system 2C is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various circulation paths. The organic solvent recovery system 2C has the same configuration as the organic solvent recovery system 1C of Embodiment 1C except for the following points: the desorbed gas G11 of the second concentrator 300 passes through the sixth flow path F6 and returns to the regeneration heater 250 .

Since the organic solvent recovery system 2C returns the desorbed gas G11 to the regeneration heater 250, there is no need to process the air volume of the desorbed gas G11 in the cooling and condensing device 100 and the first concentration device 200. Therefore, the organic solvent recovery system 2C can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. Since the organic solvent recovery system 2C has a high temperature of the desorption gas G11, it can contribute to the energy saving of the regenerative heater 250.

[Embodiment 3C] Fig. 8 is a diagram schematically showing the configuration of the organic solvent recovery system 3C of Embodiment 3C. The organic solvent recovery system 3C is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various circulation paths. The organic solvent recovery system 3C allows the desorbed gas G11 of the second concentration device 300 to pass through the sixth flow path F6 and return to the fourth flow path F4. The organic solvent recovery system 3C has the same configuration as the organic solvent recovery system 1C of Embodiment 1C except for the following points: the desorbed gas G11 of the second concentrator 300 passes through the sixth flow path F6 and returns to the fourth flow path F4.

The desorbed gas G11 circulating in the sixth circulation path F6 is allowed to circulate in the fourth circulation path F4 together with the cooled processing gas G6 discharged from the second concentrating device 300 and returns to the second heat exchanger 112. The organic solvent recovery system 3C does not need to process the air volume of the desorption gas G11 in the cooling and condensing device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 3C can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. The organic solvent recovery system 3C can increase the temperature of the fluid flowing through the second heat exchanger 112 due to the high temperature of the desorbed gas G11, which can reduce the size of the second heat exchanger 112 for cooling the exhaust gas G1 , Energy saving is helpful.

[Embodiment 4C] Fig. 9 is a diagram schematically showing the configuration of the organic solvent recovery system 4C of Embodiment 4C. The organic solvent recovery system 4C is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various circulation paths. The organic solvent recovery system 4C allows the desorbed gas G11 of the second concentration device 300 to pass through the sixth flow path F6 and return to the fifth flow path F5. The organic solvent recovery system 4C has the same configuration as the organic solvent recovery system 1C of Embodiment 1C except for the following points: the desorbed gas G11 of the second concentrator 300 passes through the sixth flow path F6 and returns to the fifth flow path F5.

The desorbed gas G11 circulating in the sixth circulation path F6 is allowed to circulate in the fifth circulation path F5 together with part of the exhaust gas G1 discharged from the second heat exchanger 112 and the cooling process gas G6, and is returned to the production facility 130. The organic solvent recovery system 4C does not need to process the air volume of the desorption gas G11 in the cooling and condensing device 100 and the first concentration device 200. Therefore, the organic solvent recovery system 4C can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. In the organic solvent recovery system 4C, since the desorption gas G11 has a high temperature, the temperature of the exhaust gas G1 discharged from the production equipment 130 can be increased. Therefore, the organic solvent recovery system 4C can increase the temperature of the fluid flowing through the second heat exchanger 112, which can contribute to the miniaturization and energy saving of the second heat exchanger 112 for cooling the exhaust gas G1. .

[Effect] The organic solvent recovery system 1C of the present embodiment includes: a cooling and condensing device 100, which cools the exhaust gas G1 containing the organic solvent to liquefy and condense the organic solvent, and discharges it as a cooling treatment gas G4 whose concentration of the organic solvent has been reduced; The first flow path F1 circulates the cooling process gas G4; the first concentrating device 200, the organic solvent contained in the cooling process gas G4 introduced from the first flow path F1 is adsorbed by the adsorption unit 210, and the concentration of the organic solvent is further increased. The reduced cooling process gas G5 is discharged, the high-temperature gas G7 is introduced to desorb the organic solvent from the adsorption unit 210, and is discharged as the desorption gas G8; the second flow path F2 allows a part of the cooling process gas G5 to circulate; and the second concentrating device 300. The organic solvent contained in the cooling process gas G5 introduced from the second flow path F2 is adsorbed by the adsorption element 310 and discharged as the clean gas G9 whose concentration of the organic solvent is further reduced. The organic solvent is desorbed and discharged as desorption gas G11.

The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the first circulation path F1. Since the organic solvent recovery system 1C returns the desorbed gas G11 to the first flow path F1, the cooling and condensing device 100 does not need to process the air volume of the desorbed gas G11. Therefore, the organic solvent recovery system 1C can contribute to the miniaturization and energy saving of the cooling and condensing device 100. In the organic solvent recovery system 1C, since the desorption gas G11 has a high temperature, it can suppress the condensation of NMP (N-methylpyrrolidone), moisture, etc. contained in the cooling process gas G4.

The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the regeneration heater 250. Since the organic solvent recovery system 2C returns the desorbed gas G11 to the regeneration heater 250, there is no need to process the air volume of the desorbed gas G11 in the cooling and condensing device 100 and the first concentration device 200. Therefore, the organic solvent recovery system 2C can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. Since the organic solvent recovery system 2C has a high temperature of the desorption gas G11, it can contribute to the energy saving of the regenerative heater 250.

The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the fourth flow path F4. The desorbed gas G11 flows through the fourth flow path F4 together with the cooling process gas G6, and returns to the second heat exchanger 112. The organic solvent recovery system 3C does not need to process the air volume of the desorption gas G11 in the cooling and condensing device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 3C can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. The organic solvent recovery system 3C can increase the temperature of the fluid flowing through the second heat exchanger 112 due to the high temperature of the desorbed gas G11, which can reduce the size of the second heat exchanger 112 for cooling the exhaust gas G1 , Energy saving is helpful.

The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the fifth flow path F5. The desorbed gas G11 circulates in the fifth circulation path F5 together with part of the exhaust gas G1 and the cooling process gas G6 discharged from the second heat exchanger 112 and returns to the production facility 130. The organic solvent recovery system 4C does not need to process the air volume of the desorption gas G11 in the cooling and condensing device 100 and the first concentration device 200. Therefore, the organic solvent recovery system 4C can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. In the organic solvent recovery system 4C, since the desorption gas G11 has a high temperature, the temperature of the exhaust gas G1 discharged from the production equipment 130 can be increased. Therefore, the organic solvent recovery system 4C can increase the temperature of the fluid flowing through the second heat exchanger 112, which can contribute to the miniaturization and energy saving of the second heat exchanger 112 for cooling the exhaust gas G1. .

The first concentrating device 200 of the present embodiment is arranged in plural in the circumferential direction around the drum axis of the hollow cylindrical drum that rotates the adsorption unit 210 around the drum axis. Thereby, the organic solvent can be recovered efficiently.

In the second concentrating device 300 of this embodiment, the adsorption element 310 is arranged in a disc-shaped adsorption drum that rotates around a drum axis. Thereby, the organic solvent can be recovered efficiently.

[Other embodiments] In the above embodiment, two concentrating devices, the first concentrating device 200 and the second concentrating device 300, are used. The concentration device can also use two first concentration devices 200 or two second concentration devices 300 according to the air volume. In addition, more than three concentrators can also be used according to the removal efficiency.

Examples of the organic solvent contained in the exhaust gas G1 include organic solvents that can be liquefied and recovered by cooling at 1°C to 50°C. The organic solvent is, for example, N-methylpyrrolidone, N-ethylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, or n-decane. These etc. are only examples, and are not limited to them. The organic solvent contained may be one type or plural types.

[Embodiment 1D] Fig. 10 is a diagram schematically showing the configuration of the organic solvent recovery system 1D of the embodiment 1D. The organic solvent recovery system 1D is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various circulation paths.

The cooling and condensing device 100 includes a cooling unit 110 and a separation unit 120. The exhaust gas G1 containing the organic solvent is exhausted from the production equipment 130. The exhaust gas G1 is cooled by passing through the cooling unit 110. The exhaust gas G1 liquefies and condenses the organic solvent as it passes through the cooling unit 110.

The exhaust gas G2 passing through the cooling part 110 is separated into the cooling condensate L1 which has been liquefied and condensed and the cooling process gas G3 whose concentration of the organic solvent is reduced by passing through the separation part 120. The cooling process gas G3 passes through the chamber 123, and a part of it is discharged as the cooling process gas G4 from the cooling and condensing device 100 to the first concentrating device 200, and the remaining part is being used as the cooling process gas G6 from the cooling and condensing device 100 to the second heat exchanger 112 described later. return.

The cooling means and structure of the cooling unit 110 are not particularly limited. In Embodiment 1D, the first heat exchanger 111 that performs cooling by exchanging heat between a refrigerant such as cooling water, cold water, and salt water, and exhaust gas is used. The first heat exchanger 111 is located at a position where the exhaust gas G1 circulates in the horizontal direction.

The cooling part 110 is provided before the first heat exchanger 111 with a second heat exchanger 112 that cools the exhaust gas G1 by cooling the heat exchange between the processing gas G6 and the exhaust gas G1. The second heat exchanger 112 can reduce the heat transfer area and the amount of refrigerant required by the first heat exchanger 111. A part of the exhaust gas G1 and the cooling process gas G6 returns to the production facility 130 through the fifth flow path F5. Conditions such as the cooling temperature in the first heat exchanger 111 and the second heat exchanger 112 may be appropriately determined depending on the organic solvent to be recovered.

The separation means and structure of the separation part 120 are not particularly limited. In Embodiment 1D, a mesh-like structure 121 that contacts and captures liquid droplets, such as a demister, a filter, and a mesh, is used. The cooling condensate L1 captured by the mesh structure 121 is collected by gravity into the storage tank 125 arranged at the lower part of the mesh structure 121 and is recovered as the recovery liquid L3.

The chamber 123 is a structure with a certain volume of space. The cooling processing gas G3 for a certain period of time is stored in the chamber 123, a part of the cooling processing gas G4 is circulated through the first circulation path F1, and is supplied to the first concentrating device 200. The cooling process gas G3 is used as the cooling process gas G6 to circulate the remainder through the fourth flow path F4 and return to the second heat exchanger 112. The chamber 123 is provided with a partition 128 which can be opposed to the exhaust direction of the cooling process gas G3 discharged from the mesh-like structure 121 to suck in the first flow path F1.

The first flow path F1 is a part where the cooling processing gas G4 is introduced from the chamber 123 to the first concentration device 200. The connection port of the first circulation path F1 to the cavity 123 is preferably the ceiling portion 127 of the cavity 123. Thereby, the intrusion of minute liquid droplets not caught by the separating unit 120 into the first concentrating device 200 can be suppressed, and the performance degradation/strength reduction caused by the wetting of the adsorption unit 210 of the first concentrating device 200 described later can be prevented. In a more preferable aspect, the cooling processing gas G4 should be taken out in a manner opposite to the flow direction of the cooling processing gas G3. In this way, the intrusion of droplets can be further prevented. In addition, a droplet prevention member similar to the mesh structure 121 described above may be provided at the outlet of the cooling processing gas G4, or a heater for vaporizing the droplets may be provided.

The first concentrating device 200 includes an adsorption drum 212 containing an adsorbent, and adsorbs the organic solvent contained in it by contact with the gas, and desorbs the adsorbed organic solvent by contact with the heated gas. The adsorption drum 212 is composed of a plurality of adsorption units 210 separated by a plurality of partitions. The suction drum 212 has a hollow cylindrical shape as a whole by a plurality of suction units 210. The adsorption drum 212 is arranged in the processing chamber and arranged so that the fluid can flow in the radial direction. The suction drum 212 is configured to be rotated around the drum shaft by the rotational driving force of the motor.

In the first concentrating device 200, a part of the adsorption unit 210 constitutes an adsorption part, and the organic solvent contained in the cooling processing gas G4 supplied from the outside to the inside of the adsorption unit 210 is adsorbed; and the remaining part of the adsorption unit 210 constitutes a desorption part The organic solvent adsorbed on the adsorption unit 210 is desorbed from the adsorption unit 210 by supplying heated air from the inside to the outside of the adsorption unit 210.

At the time of cleaning, the cooled processing gas G4 supplied into the processing chamber is introduced from the outer peripheral surface of the adsorption drum 212 to the adsorption part. When the cooling processing gas G4 introduced into the adsorption part passes through the adsorption drum 212 from the outer peripheral surface to the inner peripheral surface along the radial direction, the organic solvent is adsorbed to the plurality of adsorption units 210 located in the adsorption part, thereby being cleaned.

The cleaned cooling processing gas G5 as the fluid to be processed is discharged from the upper part of the adsorption unit 210 as a clean gas. The discharged clean gas is circulated through the second flow path F2 as the cooling processing gas G5, and is supplied to the second concentrating device 300.

The inner circumference side flow path forming member 211 and the outer circumference side flow path forming member 213 are opposed to each other on the inner circumference side and the outer circumference side of the suction drum 212 by sandwiching a part of the suction drum 212 in the circumferential direction地Configuration. The area of the suction drum 212 enclosed by the inner flow path forming member 211 and the outer flow path forming member 213 is a desorption part.

In order to perform the desorption of the organic solvent, the high-temperature gas G7, which is a part of the cooling process gas G5 heated by the regeneration heater 250, is introduced into the desorption portion from the inner peripheral side flow path forming member 211. When the high-temperature gas G7 introduced into the desorption section passes through the adsorption drum 212, the organic solvent adsorbed thereon is desorbed by heat from the plurality of adsorption units 210 located in the desorption section. The desorbed gas G8 containing an organic solvent, as a concentrated gas, is discharged from the desorbed part through the outer peripheral side flow path forming member 213 to the outside of the processing room, and returns to the third flow path F3. A part of the organic solvent contained in the desorption gas G8 is liquefied and condensed, and collected in the storage tank 125 as the desorption condensate L2.

The third flow path F3 is to return the desorbed gas G8 to the inlet of the exhaust gas G1 of the cooling and condensing device 100. The third flow path F3 is preferably connected in such a way that the desorption part is arranged above the confluence position of the desorption gas G8 and the exhaust gas G1 supplied to the cooling and condensing device 100. With this configuration, the desorbed condensate L2 generated by the desorbed gas G8 of the first concentrating device 200 can easily move to the cooling and condensing device 100. The third flow path F3 is preferably configured to circulate both the inlet of the exhaust gas G1 of the cooling and condensing device 100 and the storage tank 125. With this configuration, the desorption condensate L2 generated by the desorption gas G8 can be easily recovered directly to the storage tank 125.

In the first concentrating device 200, the adsorption unit 210 located in the adsorption part is subjected to adsorption treatment of the substance to be treated, and the adsorption unit 210 located in the desorption part after the adsorption treatment is subjected to the desorption treatment of the substance to be treated. By rotating the adsorption drum 212 around the cylinder axis, the adsorption unit 210 alternately moves the desorption part and the adsorption part to continuously perform the adsorption treatment and desorption treatment of the substance to be processed.

As the material constituting the adsorption element of the adsorption unit 210, activated alumina, silica gel, activated carbon material, zeolite, etc. can be used. The shape of the adsorption element in the adsorption unit 210 is not particularly limited. For example, it may be a honeycomb-shaped sheet containing activated carbon material or zeolite, or a laminate of activated carbon fiber non-woven fabrics.

The second concentrating device 300 includes an adsorption element 310 including an adsorbent, and adsorbs the organic solvent contained in it by contact with the gas, and desorbs the adsorbed organic solvent by contact with the heated gas. The adsorption element 310 includes a desorption part (desorption zone) 311 and an adsorption part (adsorption zone) 312. The adsorption part 312 brings the cooling processing gas G5 into contact with the adsorbing material by introducing the cooling processing gas G5, thereby adsorbing the organic solvent contained in the cooling processing gas G5 to the adsorbing material, so that the cooling processing gas G5 is cleaned as a clean The gas G9 is discharged.

The desorption part 311 introduces a gas G10 that has a higher temperature than the cooling process gas G5 to the adsorption material to desorb the organic solvent from the adsorption material, thereby discharging the desorption gas G11 containing the organic solvent. The desorbed gas G11 passes through the sixth flow path F6 and returns to the first flow path F1.

Since the organic solvent recovery system 1D returns the desorbed gas G11 to the first flow path F1, the cooling and condensing device 100 does not need to process the air volume of the desorbed gas G11. Therefore, the organic solvent recovery system 1D can contribute to the miniaturization and energy saving of the cooling and condensing device 100. In the organic solvent recovery system 1D, since the desorption gas G11 has a high temperature, it can suppress the condensation of NMP (N-methylpyrrolidone), moisture, etc. contained in the cooling process gas G4.

As the adsorption material contained in the adsorption element 310, activated alumina, silica gel, activated carbon material or zeolite is widely used, and activated carbon and hydrophobic zeolite are particularly suitable for use.

As shown in FIG. 10, the second concentrating device 300 includes a rotating shaft and an adsorption element 310 provided around the rotating shaft. The second concentrating device 300 is configured as follows: by rotating the adsorption element 310 around the rotation axis, the adsorption part 312 adsorbs the organic solvent in the cooling processing gas G5 introduced from the second flow path F2. The material continuously moves to the desorption part 311.

The second concentrating device 300 may also include a cleaning part (purge part) that moves to the adsorption part 312 after the part where the desorption process of the desorption part 311 is completed. It may also be a configuration in which a part of the clean gas G9 is introduced to the purge section, and the purge section outlet gas discharged from the purge section is introduced to the adsorption section 312. This is because by cleaning the desorbed adsorbent with the clean gas G9, the desorption gas G11 remaining in the adsorbent is prevented from mixing into the clean gas G9, and the adsorbent can be cooled.

The high-temperature gas G10 used for desorption is preferably one that uses heating means such as the regeneration heater 350 to make a part of the clean gas G9 into a high-temperature state. By making it into a high temperature state, in the adsorption part 312, the increase of the processing air volume of the organic solvent containing gas can be suppressed.

[Embodiment 2D] Fig. 11 is a diagram schematically showing the configuration of the organic solvent recovery system 2D of Embodiment 2D. The organic solvent recovery system 2D is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various circulation paths. The organic solvent recovery system 2D has the same configuration as the organic solvent recovery system 1D of Embodiment 1D except for the following points: the desorbed gas G11 of the second concentrator 300 is returned to the regeneration heater 250 through the sixth flow path F6 .

Since the organic solvent recovery system 2D returns the desorbed gas G11 to the regeneration heater 250, there is no need to process the air volume of the desorbed gas G11 in the cooling and condensing device 100 and the first concentration device 200. Therefore, the organic solvent recovery system 2D can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. The organic solvent recovery system 2D, because the desorption gas G11 has a high temperature, can contribute to the energy saving of the regenerative heater 250.

[Embodiment 3D] Fig. 12 is a diagram schematically showing the configuration of the organic solvent recovery system 3D of the embodiment 3D. The organic solvent recovery system 3D is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various circulation paths. The organic solvent recovery system 3D allows the desorbed gas G11 of the second concentration device 300 to pass through the sixth circulation path F6 and return to the fourth circulation path F4. The organic solvent recovery system 3D has the same configuration as the organic solvent recovery system 1D of Embodiment 1D except for the following points: the desorbed gas G11 of the second concentrator 300 passes through the sixth flow path F6 and returns to the fourth flow path F4.

The desorbed gas G11 that flows through the sixth flow path F6 flows through the fourth flow path F4 together with the cooled processing gas G6 discharged from the cooling and condensing device 100 and returns to the second heat exchanger 112. The organic solvent recovery system 3D does not need to process the air volume of the desorbed gas G11 in the cooling and condensing device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 3D can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. The organic solvent recovery system 3D can increase the temperature of the fluid flowing through the second heat exchanger 112 due to the high temperature of the desorbed gas G11, which can reduce the size of the second heat exchanger 112 for cooling the exhaust gas G1 , Energy saving is helpful.

[Embodiment 4D] Fig. 13 is a diagram schematically showing the configuration of the organic solvent recovery system 4D of Embodiment 4D. The organic solvent recovery system 4D is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various circulation paths. The organic solvent recovery system 4D allows the desorbed gas G11 of the second concentration device 300 to pass through the sixth flow path F6 and return to the fifth flow path F5. The organic solvent recovery system 4D has the same configuration as the organic solvent recovery system 1D of Embodiment 1D except for the following points: the desorbed gas G11 of the second concentrator 300 passes through the sixth flow path F6 and returns to the fifth flow path F5.

The desorbed gas G11 flowing through the sixth flow path F6 circulates through the fifth flow path F5 together with part of the exhaust gas G1 and the cooling process gas G6 discharged from the second heat exchanger 112 and returns to the production facility 130. The organic solvent recovery system 4D does not need to process the air volume of the desorption gas G11 in the cooling and condensing device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 4D can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. In the organic solvent recovery system 4D, since the desorption gas G11 is high temperature, the temperature of the exhaust gas G1 discharged from the production equipment 130 can be increased. Therefore, the organic solvent recovery system 4D can increase the temperature of the fluid flowing through the second heat exchanger 112, which can contribute to the miniaturization and energy saving of the second heat exchanger 112 for cooling the exhaust gas G1. .

[Effect] The organic solvent recovery system 1D of this embodiment includes a cooling and condensing device 100, which cools the exhaust gas G1 containing the organic solvent to liquefy and condense the organic solvent, and discharges it as the cooled processing gas G4 whose concentration of the organic solvent has been reduced; The first flow path F1 circulates a part of the cooled processing gas G4; the first concentrating device 200, the organic solvent contained in the cooled processing gas G4 introduced from the first flow path F1 is adsorbed by the adsorption unit 210 as the organic solvent The cooling process gas G5 whose concentration is further reduced is discharged, the high-temperature gas G7 is introduced to desorb the organic solvent from the adsorption unit 210, and is discharged as the desorption gas G8; the second flow path F2 allows the cooling process gas G5 to circulate; and the second concentrating device 300. The organic solvent contained in the cooling process gas G5 introduced from the second flow path F2 is adsorbed by the adsorption element 310 and discharged as the clean gas G9 whose concentration of the organic solvent is further reduced. The organic solvent is desorbed and discharged as desorption gas G11.

The cooling and condensing device 100 includes a second heat exchanger 112 that performs cooling of the exhaust gas G1 by heat exchange with a refrigerant. The organic solvent recovery system 1D further includes a fourth flow path F4. The fourth flow path F4 returns the cooling process gas G6, which is a part of the cooling process gas G4, that is, the remaining part of the cooling process gas, to the second heat exchanger 112. The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the first circulation path F1. In the organic solvent recovery system 1D, since the desorbed gas G11 returns to the first circulation path F1, there is no need to process the air volume of the desorbed gas G11 in the cooling and condensing device 100. Therefore, the organic solvent recovery system 1D can contribute to the miniaturization and energy saving of the cooling and condensing device 100. In the organic solvent recovery system 1D, since the desorption gas G11 has a high temperature, it can suppress the condensation of NMP (N-methylpyrrolidone), moisture, etc. contained in the cooling process gas G4.

The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the regeneration heater 250. Since the organic solvent recovery system 2D returns the desorbed gas G11 to the regeneration heater 250, there is no need to process the air volume of the desorbed gas G11 in the cooling and condensing device 100 and the first concentration device 200. Therefore, the organic solvent recovery system 2D can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. The organic solvent recovery system 2D, because the desorption gas G11 has a high temperature, can contribute to the energy saving of the regenerative heater 250.

The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the fourth flow path F4. The desorbed gas G11 flows through the fourth flow path F4 together with the cooling process gas G6, and returns to the second heat exchanger 112. The organic solvent recovery system 3D does not need to process the air volume of the desorbed gas G11 in the cooling and condensing device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 3D can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. The organic solvent recovery system 3D can increase the temperature of the fluid flowing through the second heat exchanger 112 due to the high temperature of the desorbed gas G11, which can reduce the size of the second heat exchanger 112 for cooling the exhaust gas G1 , Energy saving is helpful.

The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the fifth flow path F5. The desorbed gas G11 circulates in the fifth circulation path F5 together with part of the exhaust gas G1 and the cooling process gas G6 discharged from the second heat exchanger 112 and returns to the production facility 130. The organic solvent recovery system 4D does not need to process the air volume of the desorption gas G11 in the cooling and condensing device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 4D can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentration device 200. In the organic solvent recovery system 4D, since the desorption gas G11 is high temperature, the temperature of the exhaust gas G1 discharged from the production equipment 130 can be increased. Therefore, the organic solvent recovery system 4D can increase the temperature of the fluid flowing through the second heat exchanger 112, which can contribute to the miniaturization and energy saving of the second heat exchanger 112 for cooling the exhaust gas G1. .

The first concentrating device 200 of the present embodiment is arranged in plural in the circumferential direction around the drum axis of the hollow cylindrical drum that rotates the adsorption unit 210 around the drum axis. Thereby, the organic solvent can be recovered efficiently.

In the second concentrating device 300 of this embodiment, the adsorption element 310 is arranged in a disc-shaped adsorption drum that rotates around a drum axis. Thereby, the organic solvent can be recovered efficiently.

[Other embodiments] In the above embodiment, two concentrating devices, the first concentrating device 200 and the second concentrating device 300, are used. The concentration device can also use two first concentration devices 200 or two second concentration devices 300 according to the air volume. In addition, more than three concentrators can also be used according to the removal efficiency.

Examples of the organic solvent contained in the exhaust gas G1 include organic solvents that can be liquefied and recovered by cooling at 1°C to 50°C. The organic solvent is, for example, N-methylpyrrolidone, N-ethylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, or n-decane. These etc. are only examples, and are not limited to them. The organic solvent contained may be one type or plural types.

All the points of the embodiment disclosed this time are only examples, and it should be considered that they are not intended to limit the present invention. The scope of the disclosure of the present invention is shown by the scope of the invention patent application rather than the above description. The invention is intended to include the scope of the invention patent application and all changes within the equivalent meaning and scope thereof.

1A, 1B, 1C, 1D, 2B, 2C, 2D, 3C, 3D, 4C, 4D: organic solvent recovery system 100: Cooling and condensing device 110: Cooling part 111: The first heat exchanger 112: second heat exchanger 120: Separation part 121: Mesh structure 122: Acceptance Department 123: Chamber 124: Weir 126: heater 125: storage tank 127: Ceiling Department 128: divider 130: production equipment 200: The first concentration device 210: Adsorption unit 211: Inner peripheral side flow path forming member 212: Adsorption drum 213: Peripheral flow path forming member 250, 350: Regenerative heater 300: The second concentration device 310: Adsorption component 311: Desorption part (desorption area) 312: Adsorption part (adsorption zone) 500,600: concentration device F1: The first circulation path F2: Second circulation path F3: Third circulation path F4: Fourth circulation path F5: Fifth circulation path F6: The sixth circulation path G1, G2: exhaust gas G3, G4, G5, G6: cooling process gas G7, G10: high temperature gas G8, G11: desorption gas G9: Clean gas L1: Cooling condensate L2: Desorption condensate L3: Recovered liquid

Fig. 1 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 1A. Fig. 2 is an example of another configuration diagram of the organic solvent recovery system of Embodiment 1A. Fig. 3 is an example of another configuration diagram of the organic solvent recovery system of Embodiment 1A. Fig. 4 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 1B. Fig. 5 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 2B. Fig. 6 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 1C. Fig. 7 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 2C. Fig. 8 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 3C. Fig. 9 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 4C. Fig. 10 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 1D. Fig. 11 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 2D. Fig. 12 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 3D. Fig. 13 is a diagram schematically showing the configuration of the organic solvent recovery system of Embodiment 4D.

1A: Organic solvent recovery system

100: Cooling and condensing device

110: Cooling part

111: The first heat exchanger

112: second heat exchanger

120: Separation part

121: Mesh structure

123: Chamber

125: storage tank

127: Ceiling Department

128: divider

130: production equipment

300: The second concentration device

310: Adsorption component

311: Desorption part (desorption area)

312: Adsorption part (adsorption zone)

350: Regenerative heater

F1: The first circulation path

F2: Second circulation path

G1, G2: exhaust gas

G3, G4, G6: Cooling process gas

G9: Clean gas

G10: High temperature gas

G11: desorption gas

L1: Cooling condensate

L2: Desorption condensate

L3: Recovered liquid

Claims (30)

An organic solvent recovery system, including: The cooling and condensing device, by cooling the exhaust gas containing the organic solvent, the organic solvent is liquefied and condensed, and discharged as the cooling processing gas whose concentration of the organic solvent has been reduced; The first circulation path allows a part of the cooling process gas to circulate; The concentration device is equipped with an adsorption element, and the organic solvent contained in the cooling processing gas introduced from the first flow path is adsorbed by the adsorption element, and discharged as a clean gas whose concentration of the organic solvent is further reduced, and a high-temperature gas is introduced. Desorb the organic solvent from the adsorption element and discharge it as a desorption gas; and A second circulation path, introducing the desorption gas to the cooling and condensing device; In this organic solvent recovery system, The cooling and condensing device includes: a mesh-like structure that separates the condensed organic solvent from the cooling process gas by contacting the exhaust gas after cooling; and a chamber that passes through the mesh-like structure The cooling process gas is stored for a certain period of time; The first flow path is provided to introduce a part of the cooling processing gas from the ceiling portion of the chamber to the concentrating device. Such as the organic solvent recovery system of claim 1, in which, The chamber is provided with a partition that can be opposed to the exhaust direction of the cooling process gas discharged from the mesh-like structure to perform the suction of the first flow path. Such as the organic solvent recovery system of claim 1, in which, The cooling and condensing device includes a heat exchanger that performs the cooling by heat exchange with a refrigerant. Such as the organic solvent recovery system of claim 1, in which, In the second flow path, the desorption part is arranged above the confluence position of the desorption gas and the exhaust gas. Such as the organic solvent recovery system of claim 1, in which, The exhaust gas is the gas discharged from the production equipment; The organic solvent recovery system further includes a return path for returning part of the cooling process gas discharged from the first circulation path, that is, the remaining part of the cooling process gas, to the production equipment. Such as the organic solvent recovery system of any one of claims 3 to 5, wherein: The heat exchanger includes a first heat exchanger and a second heat exchanger arranged in the front section of the first heat exchanger; The second heat exchanger cools the exhaust gas introduced into the cooling and condensing device by heat exchange with the rest of the cooling process gas. An organic solvent recovery system that recovers the organic solvent from the exhaust gas containing the organic solvent discharged from the production equipment, including: Cooling and condensing device, by cooling the exhaust gas containing the organic solvent to liquefy and condense the organic solvent, and discharge it as a cooling treatment gas whose concentration of the organic solvent has been reduced; The first circulation path allows the cooling process gas to circulate; The first concentrating device absorbs the organic solvent contained in the cooled processing gas introduced from the first flow path by the first adsorption element, and discharges it as the first processing gas whose concentration of the organic solvent is further reduced, and introduces high-temperature gas The organic solvent is desorbed from the first adsorption element and discharged as the first desorption gas; The second circulation path allows a part of the first processing gas to circulate; The second concentrating device absorbs the organic solvent contained in the first processing gas introduced from the second flow path by the second adsorption element, and discharges it as the second processing gas whose concentration of the organic solvent is further reduced, and introduces high temperature Gas and desorb the organic solvent from the second adsorption element, and discharge it as a second desorption gas; and The third circulation path returns the first desorption gas and the second desorption gas to the cooling and condensing device. Such as the organic solvent recovery system of claim 7, in which, The cooling and condensing device further includes: a mesh-like structure for separating the condensed organic solvent from the cooling processing gas by contacting the cooled exhaust gas; and a chamber through which the mesh-like structure will pass The cooling process gas after the body is stored for a certain period of time; The first circulation path is provided to introduce the cooling processing gas from the ceiling portion of the chamber to the first concentrating device. Such as the organic solvent recovery system of claim 8, in which, The chamber is provided with a partition that can be opposed to the exhaust direction of the cooling process gas discharged from the mesh-like structure to perform the suction of the first flow path. Such as the organic solvent recovery system of claim 7, in which, The cooling and condensing device further includes a heat exchanger that performs the cooling by heat exchange with the refrigerant. Such as the organic solvent recovery system of claim 7, in which, It further includes a return path for returning part of the first processing gas discharged from the second circulation path, that is, the remaining part of the first processing gas, to the production equipment. Such as the organic solvent recovery system of claim 10 or 11, in which, The heat exchanger includes a first heat exchanger and a second heat exchanger arranged in the front section of the first heat exchanger; The second heat exchanger cools the exhaust gas introduced into the cooling and condensing device by heat exchange with the rest of the first processing gas. An organic solvent recovery system that recovers the organic solvent from the exhaust gas containing the organic solvent discharged from the production equipment, including: A cooling and condensing device, by cooling the exhaust gas containing the organic solvent to liquefy and condense the organic solvent, and discharge the cooled processing gas whose concentration of the organic solvent has been reduced as the exhaust gas; Cooling gas circulation path to circulate the cooling processing gas; The concentrating device absorbs the organic solvent contained in the cooling processing gas introduced from the cooling gas flow path by an adsorption element, and discharges it as processing gas whose concentration of the organic solvent is further reduced, and introduces a high-temperature gas to remove it from the adsorption element. The organic solvent is desorbed and discharged as a desorption gas; and A desorption gas flow path, introducing the desorption gas to the cooling and condensing device; The cooling and condensing device includes: a cooling part that allows the exhaust gas to circulate; and a separation part, which is located on the downstream side of the cooling part when viewed along the flow direction of the exhaust gas; The separation part is provided with: a receiving part to receive the cooling condensate containing the organic solvent cooled by the cooling part; Processing gas separation; and a chamber, storing the cooling processing gas after passing through the mesh structure for a certain period of time; When viewed along the flow direction of the exhaust gas, with respect to the direction from the cooling section to the separation section, the direction of flow from the mesh structure in the separation section to the chamber is crossed so that the exhaust The gas flows in the L-shaped direction. Such as the organic solvent recovery system of claim 13, in which, A heater for heating the cooling processing gas is arranged on the downstream side of the mesh structure. Such as the organic solvent recovery system of claim 13, in which, In the chamber, a weir is provided to prevent the cooling condensate from flowing to the cooling gas flow path. Such as the organic solvent recovery system of claim 13, in which, The concentrating device includes a first concentrating device and a second concentrating device located on the downstream side of the first concentrating device; In the first concentrating device, the organic solvent contained in the cooling processing gas introduced from the cooling gas flow path is adsorbed by the first adsorption element, and discharged as the first processing gas whose concentration of the organic solvent is further reduced, and introducing a high temperature Gas and desorb the organic solvent from the first adsorption element, and discharge it as the first desorption gas; The organic solvent recovery system further includes a first processing gas circulation path for circulating a part of the first processing gas; The second concentrating device absorbs the organic solvent contained in the first processing gas introduced from the first processing gas flow path by a second adsorption element, and discharges it as a second processing gas whose concentration of the organic solvent is further reduced , The high-temperature gas is introduced to desorb the organic solvent from the second adsorption element, and is discharged as the second desorption gas. Such as the organic solvent recovery system of claim 16, in which, In the first concentrating device, a plurality of the first adsorption elements are arranged in the circumferential direction around the drum axis of the hollow cylindrical rotating drum rotating around the drum axis. Such as the organic solvent recovery system of claim 16, in which, In the second concentrating device, the second adsorption element is arranged on a disc-shaped adsorption drum that rotates around a drum axis. An organic solvent recovery system that recovers the organic solvent from the exhaust gas containing the organic solvent discharged from the production equipment, including: Cooling and condensing device, by cooling the exhaust gas containing the organic solvent to liquefy and condense the organic solvent, and discharge it as a cooling treatment gas whose concentration of the organic solvent has been reduced; Cooling gas circulation path to circulate the cooling processing gas; The first concentrating device absorbs the organic solvent contained in the cooling process gas introduced from the cooling gas flow path by the first adsorption element, and discharges it as the first process gas whose concentration of the organic solvent is further reduced, and introduces high-temperature gas The organic solvent is desorbed from the first adsorption element and discharged as the first desorption gas; The first processing gas flow path allows a part of the first processing gas to circulate; and The second concentrating device absorbs the organic solvent contained in the first processing gas introduced from the first processing gas flow path by the second adsorption element, and discharges it as the second processing gas whose concentration of the organic solvent is further reduced, Introducing a high-temperature gas to desorb the organic solvent from the second adsorption element, and discharge it as a second desorption gas; The first desorption gas is returned to the cooling and condensing device, and the second desorption gas is returned to the cooling gas circulation path. An organic solvent recovery system that recovers the organic solvent from the exhaust gas containing the organic solvent discharged from the production equipment, including: Cooling and condensing device, by cooling the exhaust gas containing the organic solvent to liquefy and condense the organic solvent, and discharge it as a cooling treatment gas whose concentration of the organic solvent has been reduced; Cooling gas circulation path to circulate the cooling processing gas; The first concentrating device absorbs the organic solvent contained in the cooling processing gas introduced from the cooling gas flow path by the first adsorption element, and discharges it as the first processing gas whose concentration of the organic solvent is further reduced. A heater introduces high-temperature gas to desorb the organic solvent from the first adsorption element, and discharge it as the first desorption gas; The first processing gas flow path allows a part of the first processing gas to circulate; and The second concentrating device absorbs the organic solvent contained in the first processing gas introduced from the first processing gas flow path by the second adsorption element, and discharges it as the second processing gas whose concentration of the organic solvent is further reduced, Introducing a high-temperature gas through a second heater to desorb the organic solvent from the second adsorption element, and discharge it as a second desorption gas; The first desorption gas is returned to the cooling and condensing device, and the second desorption gas is returned to the first heater. An organic solvent recovery system that recovers the organic solvent from the exhaust gas containing the organic solvent discharged from the production equipment, including: Cooling and condensing device, by cooling the exhaust gas containing the organic solvent to liquefy and condense the organic solvent, and discharge it as a cooling treatment gas whose concentration of the organic solvent has been reduced; Cooling gas circulation path to circulate the cooling processing gas; The first concentrating device absorbs the organic solvent contained in the cooling process gas introduced from the cooling gas flow path by the first adsorption element, and discharges it as the first process gas whose concentration of the organic solvent is further reduced, and introduces high-temperature gas The organic solvent is desorbed from the first adsorption element and discharged as the first desorption gas; The first processing gas circulation path allows a part of the first processing gas to circulate; Cooling and condensing device return path, so that part of the first processing gas discharged from the first processing gas flow path, that is, the remaining part of the first processing gas, is returned to the cooling and condensing device; and The second concentrating device absorbs the organic solvent contained in the first processing gas introduced from the first processing gas flow path by the second adsorption element, and discharges it as the second processing gas whose concentration of the organic solvent is further reduced, Introducing a high-temperature gas to desorb the organic solvent from the second adsorption element, and discharge it as a second desorption gas; The first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the cooling and condensing device return path. An organic solvent recovery system that recovers the organic solvent from the exhaust gas containing the organic solvent discharged from the production equipment, including: Cooling and condensing device, by cooling the exhaust gas containing the organic solvent to liquefy and condense the organic solvent, and discharge it as a cooling treatment gas whose concentration of the organic solvent has been reduced; Cooling gas circulation path to circulate the cooling processing gas; The first concentrating device absorbs the organic solvent contained in the cooling process gas introduced from the cooling gas flow path by the first adsorption element, and discharges it as the first process gas whose concentration of the organic solvent is further reduced, and introduces high-temperature gas The organic solvent is desorbed from the first adsorption element and discharged as the first desorption gas; The first processing gas flow path allows a part of the first processing gas to circulate; and The second concentrating device absorbs the organic solvent contained in the first processing gas introduced from the first processing gas flow path by the second adsorption element, and discharges it as the second processing gas whose concentration of the organic solvent is further reduced, Introducing a high-temperature gas to desorb the organic solvent from the second adsorption element, and discharge it as a second desorption gas; The cooling and condensing device includes a heat exchanger that performs cooling by heat exchange with a refrigerant; The organic solvent recovery system further includes a production equipment return path, and the production equipment return path enables a part of the exhaust gas discharged from the production equipment to return to the production equipment after passing through the heat exchanger; The first desorption gas is returned to the cooling and condensing device, and the second desorption gas is returned to the return path of the production equipment. Such as the organic solvent recovery system of any one of claims 19 to 22, wherein: In the first concentrating device, a plurality of the first adsorption elements are arranged in the circumferential direction around the drum axis of the hollow cylindrical rotating drum rotating around the drum axis. Such as the organic solvent recovery system of any one of claims 19 to 22, wherein: In the second concentrating device, the second adsorption element is arranged on a disc-shaped adsorption drum rotating around a drum axis. An organic solvent recovery system that recovers the organic solvent from the exhaust gas containing the organic solvent discharged from the production equipment, including: Cooling and condensing device, by cooling the exhaust gas containing the organic solvent to liquefy and condense the organic solvent, and discharge it as a cooling treatment gas whose concentration of the organic solvent has been reduced; Cooling gas circulation path, allowing part of the cooling processing gas to circulate; The first concentrating device absorbs the organic solvent contained in the cooling process gas introduced from the cooling gas flow path by the first adsorption element, and discharges it as the first process gas whose concentration of the organic solvent is further reduced, and introduces high-temperature gas The organic solvent is desorbed from the first adsorption element and discharged as the first desorption gas; The first processing gas flow path allows the first processing gas to circulate; and The second concentrating device absorbs the organic solvent contained in the first processing gas introduced from the first processing gas flow path by the second adsorption element, and discharges it as the second processing gas whose concentration of the organic solvent is further reduced, Introducing a high-temperature gas to desorb the organic solvent from the second adsorption element, and discharge it as a second desorption gas; The cooling and condensing device includes a heat exchanger that performs cooling of the exhaust gas by heat exchange with a refrigerant; The organic solvent recovery system further includes a heat exchanger return path, and the heat exchanger return path returns a part of the cooling process gas, that is, the rest of the cooling process gas, to the heat exchanger; The first desorption gas is returned to the cooling and condensing device, and the second desorption gas is returned to the cooling gas circulation path. An organic solvent recovery system that recovers the organic solvent from the exhaust gas containing the organic solvent discharged from the production equipment, including: Cooling and condensing device, by cooling the exhaust gas containing the organic solvent to liquefy and condense the organic solvent, and discharge it as a cooling treatment gas whose concentration of the organic solvent has been reduced; Cooling gas circulation path, allowing part of the cooling processing gas to circulate; The first concentrating device absorbs the organic solvent contained in the cooling processing gas introduced from the cooling gas flow path by the first adsorption element, and discharges it as the first processing gas whose concentration of the organic solvent is further reduced, and is heated by heating The device introduces high-temperature gas to desorb the organic solvent from the first adsorption element, and discharges it as the first desorption gas; The first processing gas flow path allows the first processing gas to circulate; and The second concentrating device absorbs the organic solvent contained in the first processing gas introduced from the first processing gas flow path by the second adsorption element, and discharges it as the second processing gas whose concentration of the organic solvent is further reduced, Introducing a high-temperature gas to desorb the organic solvent from the second adsorption element, and discharge it as a second desorption gas; The cooling and condensing device includes a heat exchanger that performs cooling of the exhaust gas by heat exchange with a refrigerant; The organic solvent recovery system further includes a heat exchanger return path, and the heat exchanger return path returns a part of the cooling process gas, that is, the rest of the cooling process gas, to the heat exchanger; The first desorption gas is returned to the cooling and condensing device, and the second desorption gas is returned to the heater. An organic solvent recovery system that recovers the organic solvent from the exhaust gas containing the organic solvent discharged from the production equipment, including: Cooling and condensing device, by cooling the exhaust gas containing the organic solvent to liquefy and condense the organic solvent, and discharge it as a cooling treatment gas whose concentration of the organic solvent has been reduced; Cooling gas circulation path, allowing part of the cooling processing gas to circulate; The first concentrating device absorbs the organic solvent contained in the cooling process gas introduced from the cooling gas flow path by the first adsorption element, and discharges it as the first process gas whose concentration of the organic solvent is further reduced, and introduces high-temperature gas The organic solvent is desorbed from the first adsorption element and discharged as the first desorption gas; The first processing gas flow path allows the first processing gas to circulate; and The second concentrating device absorbs the organic solvent contained in the first processing gas introduced from the first processing gas flow path by the second adsorption element, and discharges it as the second processing gas whose concentration of the organic solvent is further reduced, Introducing a high-temperature gas to desorb the organic solvent from the second adsorption element, and discharge it as a second desorption gas; The cooling and condensing device includes a heat exchanger that performs cooling by heat exchange with a refrigerant; The organic solvent recovery system further includes a heat exchanger return path, and the heat exchanger return path returns a part of the cooling process gas, that is, the rest of the cooling process gas, to the heat exchanger; The first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the heat exchanger return path. An organic solvent recovery system that recovers the organic solvent from the exhaust gas containing the organic solvent discharged from the production equipment, including: Cooling and condensing device, by cooling the exhaust gas containing the organic solvent to liquefy and condense the organic solvent, and discharge it as a cooling treatment gas whose concentration of the organic solvent has been reduced; Cooling gas circulation path, allowing part of the cooling processing gas to circulate; The first concentrating device absorbs the organic solvent contained in the cooling process gas introduced from the cooling gas flow path by the first adsorption element, and discharges it as the first process gas whose concentration of the organic solvent is further reduced, and introduces high-temperature gas The organic solvent is desorbed from the first adsorption element and discharged as the first desorption gas; The first processing gas flow path allows the first processing gas to circulate; and The second concentrating device absorbs the organic solvent contained in the first processing gas introduced from the first processing gas flow path by the second adsorption element, and discharges it as the second processing gas whose concentration of the organic solvent is further reduced, Introducing a high-temperature gas to desorb the organic solvent from the second adsorption element, and discharge it as a second desorption gas; The cooling and condensing device includes a heat exchanger that performs cooling by heat exchange with a refrigerant; The organic solvent recovery system further includes: A heat exchanger return path, so that a part of the cooling process gas, that is, the rest of the cooling process gas, is returned to the heat exchanger; and Production equipment return path, so that a part of the exhaust gas discharged from the production equipment returns to the production equipment after passing through the heat exchanger; The first desorption gas is returned to the cooling and condensing device, and the second desorption gas is returned to the return path of the production equipment. Such as the organic solvent recovery system of any one of Claims 25 to 28, wherein: In the first concentrating device, a plurality of the first adsorption elements are arranged in the circumferential direction around the drum axis of the hollow cylindrical rotating drum rotating around the drum axis. Such as the organic solvent recovery system of any one of Claims 25 to 28, wherein: In the second concentrating device, the second adsorption element is arranged on a disc-shaped adsorption drum rotating around a drum axis.

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