Aromatic hydrocarbon extraction device

Abstract

The utility model provides an aromatic hydrocarbon extraction device and relates to the technical field of chemical processes. The aromatic hydrocarbon extraction device comprises a recovery tower, a cooling device, a purification device, a wet solvent tank, an underground solvent tank, a first solvent pump and a second solvent pump. The first solvent pump is arranged on a communicating pipeline between the first liquid outlet and the first liquid inlet or a communicating pipeline between the second liquid outlet and the second liquid inlet, and is used for pumping the lean solvent in the recovery tower into the purification device; and the second solvent pump is arranged on a communicating pipeline between the third liquid outlet and the third liquid inlet and is used for pumping materials in the underground solvent tank into the wet solvent tank. According to the aromatic hydrocarbon extraction device, regeneration of the lean solvent and collection and separation of materials in the underground solvent tank are separated and do not interfere with each other, online sustainable regeneration and purification of the lean solvent are ensured, and reliable guarantee is provided for long, full, safe, stable and excellent operation of the device.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of chemical process technology, and particularly relates to an aromatic hydrocarbon extraction device. BACKGROUND

[0002] Aromatic hydrocarbon extraction generally adopts a sulfolane extraction distillation process, and in order to ensure the quality of sulfolane solvent, continuous purification of lean solvent is an important measure to ensure the quality of the solvent. The initial temperature of the lean solvent is relatively high, and in order to meet the requirements of the subsequent purification process, the temperature of the lean solvent must be reduced to normal temperature before it enters the solvent purification facility, so the lean solvent is cooled to normal temperature by a lean solvent cooler and then enters the solvent purification facility. In the aromatic hydrocarbon extraction device, the underground solvent tank is used to receive materials from various closed discharge points in the device, and in order to ensure the effective operation of the underground solvent tank, the liquid level is strictly controlled within a certain range. When the liquid level exceeds a certain value, the materials need to be transported to the wet solvent tank and then re-enter the solvent system through a backfiring process to realize the recycling of the materials. The temperature of the materials in the underground solvent tank is relatively low, and the materials do not need to be cooled and can be directly transferred to the wet solvent tank.

[0003] As shown in Figure 1 , in the prior art, the cooling and purification of the lean solvent and the material withdrawal of the underground solvent tank both need to pass through the lean solvent cooler (the solid arrow in Figure 1 represents the cooling and purification route of the lean solvent, and the dotted arrow in Figure 1 represents the collection route of the materials in the underground solvent tank), that is, part of the process is overlapped. After the material withdrawal of the underground solvent tank, before the solvent purification facility is restarted, the materials (containing oil, water, impurities, etc.) remaining in the lean solvent cooler need to be fully replaced, otherwise the operating cycle of the solvent purification facility will be greatly shortened (the pressure difference of the filter will rise quickly), the quality of the lean solvent in the system cannot be guaranteed, and this is a hidden danger for long-period and high-load operation of the device. SUMMARY

[0004] In view of the problems existing in the prior art, the utility model provides an aromatic hydrocarbon extraction device to ensure the online sustainable regeneration and purification of the lean solvent.

[0005] In order to achieve the above object and other related objects, the utility model provides an aromatic hydrocarbon extraction device, the aromatic hydrocarbon extraction device includes recovery tower, cooling device, purification device, wet solvent tank, underground solvent tank, first solvent pump and second solvent pump, be provided with first liquid outlet on the recovery tower, be provided with first liquid inlet and second liquid outlet on the cooling device, the first liquid inlet with the first liquid outlet intercommunication, be provided with second liquid inlet on the purification device, the second liquid inlet with the second liquid outlet intercommunication, be provided with third liquid inlet on the wet solvent tank, be provided with third liquid outlet on the underground solvent tank, the third liquid outlet with the third liquid inlet intercommunication, the first solvent pump sets up on the intercommunication pipeline between the first liquid outlet with the first liquid inlet, or the intercommunication pipeline between the second liquid outlet with the second liquid inlet, is used for pumping the lean solvent in the recovery tower to the purification device, the second solvent pump sets up on the intercommunication pipeline between the third liquid outlet with the third liquid inlet, is used for pumping the material in the underground solvent tank to the wet solvent tank.

[0006] In an embodiment of the utility model, the first solvent pump is provided with a first liquid suction port and a first liquid discharge port, the first liquid suction port is communicated with the first liquid outlet, the first liquid discharge port is communicated with the first liquid inlet, the second solvent pump is provided with a second liquid suction port and a second liquid discharge port, the second liquid suction port is communicated with the third liquid outlet, the second liquid discharge port is communicated with the third liquid inlet.

[0007] In an embodiment of the utility model, the aromatic hydrocarbon extraction device includes a first pipeline, a second pipeline and a third pipeline, the first liquid outlet is communicated with the first liquid inlet through the first pipeline, the second liquid outlet is communicated with the second liquid inlet through the second pipeline, and the third liquid outlet is communicated with the third liquid inlet through the third pipeline.

[0008] In an embodiment of the utility model, the aromatic hydrocarbon extraction device further includes a first branch and a second branch, the wet solvent tank is provided with a fourth liquid inlet, one end of the first branch is communicated with the third pipeline, the other end of the first branch is communicated with the first pipeline, one end of the second branch is communicated with the second pipeline, and the other end of the second branch is communicated with the fourth liquid inlet.

[0009] In an embodiment of the utility model, the aromatic hydrocarbon extraction device further includes a solvent circulation device, the solvent circulation device is provided with a fifth liquid inlet, the purification device is provided with a fourth liquid outlet, and the fourth liquid outlet is communicated with the fifth liquid inlet.

[0010] In an embodiment of the utility model, the aromatic hydrocarbon extraction device further includes a solvent supply tank for supplementing solvent to the wet solvent tank, a fifth liquid outlet is arranged on the solvent supply tank, and the fifth liquid outlet is communicated with the third liquid inlet.

[0011] In an embodiment of the utility model, the aromatic hydrocarbon extraction device further includes a fourth pipeline, one end of the fourth pipeline is communicated with the fifth liquid outlet, and the other end of the fourth pipeline is communicated with the third pipeline.

[0012] In an embodiment of the utility model, a one-way valve is arranged on the third pipeline, a water inlet of the one-way valve is communicated with the second liquid outlet, and a water outlet of the one-way valve is communicated with a confluence point of the third pipeline and the first branch.

[0013] In an embodiment of the utility model, a liquid level meter for measuring the material height in the underground solvent tank is arranged on the underground solvent tank.

[0014] In an embodiment of the utility model, a temperature detection device for detecting the material temperature in the underground solvent tank is arranged on the underground solvent tank.

[0015] The aromatic hydrocarbon extraction device of the utility model, the first solvent pump is arranged on the communication pipeline between the first liquid outlet of the recovery tower and the first liquid inlet of the cooling device, or the communication pipeline between the second liquid outlet of the cooling device and the second liquid inlet of the purification device, the lean solvent in the recovery tower is sucked into the purification device, and the regeneration of the lean solvent is realized; the second solvent pump is arranged on the communication pipeline between the third liquid outlet of the underground solution tank and the third liquid inlet of the wet solvent tank, and the material in the underground solvent tank is sucked into the wet solvent tank. The aromatic hydrocarbon extraction device of the application can realize the independent regeneration of the lean solvent and the material collection of the underground solvent tank, and the two do not interfere with each other, ensure that the lean solvent can be regenerated and purified on line, and provide reliable protection for long, full, safe, stable and optimal operation of the device. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other embodiments can be obtained according to these drawings without creative labor for those skilled in the art.

[0017] Figure 1 It is a structural schematic view of the prior art aromatic hydrocarbon extraction device;

[0018] Figure 2 It is a structural schematic view of the aromatic hydrocarbon extraction device in an embodiment of the utility model.

[0019] Element No. Explanation

[0020] 100, recovery tower; 110, first liquid outlet; 120, first solvent pump; 121, first liquid suction port; 122, first liquid discharge port; 130, first pipeline; 131, first valve; 200, cooling device; 210, first liquid inlet; 220, second liquid outlet; 230, second pipeline; 231, second branch; 2311, fifth valve; 232, second valve; 300, purification device; 310, second liquid inlet; 320, fourth liquid outlet; 400, wet solvent tank; 410, third liquid inlet; 420, fourth liquid inlet; 500, underground solvent tank; 510, third liquid outlet; 520, second solvent pump; 521, second liquid suction port; 522, second liquid discharge port; 530, third pipeline; 531, first branch; 5311, fourth valve; 532, third valve; 533, one-way valve; 600, solvent circulation device; 610, fifth liquid inlet; 700, solvent supply tank; 710, fifth liquid outlet; 720, fourth pipeline; 721, sixth valve. DETAILED DESCRIPTION

[0021] The above and other advantages and effects of the present application will become readily apparent to those of ordinary skill in the art from the following description in conjunction with the accompanying drawings. The present application can be applied or embodied in various ways, and the details of the present application can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present application are used to describe specific embodiments, and are not intended to limit the scope of protection of the present application. The test methods in the following embodiments are not specified, and are generally performed under conventional conditions or under conditions recommended by the manufacturers.

[0022] When the embodiments give numerical ranges, it should be understood that, unless otherwise specified by the present application, each numerical range has two endpoints and any number between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present application are consistent with the understanding of the prior art by those skilled in the art and the description of the present application. Any method, device and material of the prior art similar or equivalent to the method, device and material of the embodiments of the present application can be used to realize the present application.

[0023] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in the specification are only for the convenience of clear description, and are not used to limit the scope of the utility model, and the change or adjustment of the relative relationship is also regarded as the implementable range of the utility model without substantial change of the technical content.

[0024] In the aromatic extraction device, the main function of the recovery column is to separate the aromatic hydrocarbon and the solvent, so that the solvent can be recycled. In the recovery column, the aromatic hydrocarbon is separated from the solvent by using the boiling point difference between the aromatic hydrocarbon and the solvent through the process of vacuum distillation or stripping. The overhead of the recovery column is light components (aromatic hydrocarbon + a small amount of solvent vapor), and the bottom is lean solvent (solvent removed of aromatic hydrocarbon, recycled back to the extraction column for repeated use). Due to process reasons, the temperature of the lean solvent in the recovery column is relatively high, generally around 175℃, so the lean solvent needs to be cooled by a cooler before being purified and regenerated.

[0025] The underground solvent tank is usually buried underground to reduce the risk of fire and explosion, prevent solvent leakage and diffusion, reduce volatilization and environmental pollution, save ground space, maintain stable solvent temperature, and reduce construction and maintenance costs. When the aromatic extraction device is in normal operation, the underground solvent tank is used to collect and temporarily store the materials discharged from the pump filter cleaning, the flare vent tank and the solvent purification facility.

[0026] The wet solvent tank is used for further processing and recovery of the solvent in the underground solvent tank, to ensure effective use of the solvent and stable operation of the device. Generally, the material in the underground solvent tank is transferred to the wet solvent tank when it reaches a certain height. Since the transfer of the material in the underground solvent tank is not a continuous process, the material naturally cools after entering the wet solvent tank, so the temperature of the material transferred to the wet solvent tank is relatively low, generally below 40℃, so it does not need to be cooled and can be directly transferred to the wet solvent tank.

[0027] Please refer to Figure 2 The utility model provides a kind of aromatic extraction device, which comprises recovery column 100, cooling device 200, purification device 300, wet solvent tank 400, underground solvent tank 500, first solvent pump 120 and second solvent pump 520. The aromatic extraction device in the present application separates the cooling and purification route of lean solvent in the recovery column 100 and the collection route of material in the underground solvent tank 500, and they do not interfere with each other, ensuring the online sustainable regeneration and purification of lean solvent, and providing reliable guarantee for long, full, safe, stable and optimal operation of the device.

[0028] Please refer to Figure 2The cooling device 200 can be any device capable of cooling the lean solvent, and the purification device 300 can be any device capable of removing the chloride ions and the aged polymerized solvent from the lean solvent to avoid corrosion of the pipeline equipment caused by decomposition of the solvent. In an exemplary embodiment, the purification device 300 mainly uses resin adsorption to neutralize and remove the chloride ions and the aged polymerized solvent. In an embodiment, the recovery column 100 is provided with a first liquid outlet 110, the cooling device 200 is provided with a first liquid inlet 210 and a second liquid outlet 220, the first liquid inlet 210 is in communication with the first liquid outlet 110, the purification device 300 is provided with a second liquid inlet 310, the second liquid inlet 310 is in communication with the second liquid outlet 220, the wet solvent tank 400 is provided with a third liquid inlet 410, the underground solvent tank 500 is provided with a third liquid outlet 510, the third liquid outlet 510 is in communication with the third liquid inlet 410. The first solvent pump 120 is arranged on the communication pipeline between the first liquid outlet 110 and the first liquid inlet 210, or the first solvent pump 120 is arranged on the communication pipeline between the second liquid outlet 220 and the second liquid inlet 310, for pumping the lean solvent in the recovery column 100 into the purification device 300, and the second solvent pump 520 is arranged on the communication pipeline between the third liquid outlet 510 and the third liquid inlet 410, for pumping the material in the underground solvent tank 500 into the wet solvent tank 400.

[0029] Please refer to Figure 2 In an embodiment, the aromatic extraction device comprises a first pipeline 130, a second pipeline 230 and a third pipeline 530. The first liquid outlet 110 and the first liquid inlet 210 are in communication through the first pipeline 130; the second liquid outlet 220 and the second liquid inlet 310 are in communication through the second pipeline 230; and the third liquid outlet 510 and the third liquid inlet 410 are in communication through the third pipeline 530. Figure 2 The solid arrow in the figure represents the cooling and purification route of the lean solvent, and the dotted arrow in the figure represents the collection route of the material in the underground solvent tank 500. It can be seen that the cooling and purification route of the lean solvent and the collection route of the material in the underground solvent tank 500 are independently operated and do not interfere with each other, so that the continuous regeneration of the lean solvent can be achieved. Here, the number of underground solvent tanks 500 is not limited, and if the number of underground solvent tanks 500 is multiple, the pipelines between the multiple underground solvent tanks 500 and the wet solvent tank 400 are in parallel.

[0030] Please refer to Figure 2In one embodiment, the first solvent pump 120 is disposed on the first pipeline 130, and the first solvent pump 120 is provided with a first liquid suction port 121 and a first liquid discharge port 122. The first liquid suction port 121 is in communication with the first liquid outlet port 110, and the first liquid discharge port 122 is in communication with the first liquid inlet port 210. In other embodiments, the first solvent pump 120 can also be disposed on the second pipeline 230, and the first liquid suction port 121 is in communication with the second liquid outlet port 220, and the first liquid discharge port 122 is in communication with the second liquid inlet port 310. As long as the poor solvent in the recovery column 100 can be pumped to the cooling device 200 for cooling and then to the purification device 300 for purification, it is acceptable.

[0031] Referring to Figure 2 In one embodiment, the second solvent pump 520 is disposed on the third pipeline 530, and the second solvent pump 520 is provided with a second liquid suction port 521 and a second liquid discharge port 522. The second liquid suction port 521 is in communication with the third liquid outlet port 510, and the second liquid discharge port 522 is in communication with the third liquid inlet port 410. In this embodiment, the underground solvent tank 500 is provided with a liquid level meter for real-time monitoring of the material height in the underground solvent tank 500. When the material in the underground solvent tank 500 reaches a certain height, the second solvent pump 520 can be started to pump the material in the underground solvent tank 500 to the wet solvent tank 400. For example, when the liquid level of the material in the underground solvent tank 500 is higher than 60%, the second solvent pump 520 is started to transfer the material in the underground solvent tank 500 to the wet solvent tank 400. When the liquid level of the material in the underground solvent tank 500 drops to 20%, the second solvent pump 520 is stopped. The type of the second solvent pump 520 is not limited here, as long as it can pump the material in the underground solvent tank 500 to the wet solvent tank 400.

[0032] Referring to Figure 2, the underground solvent tank 500 is provided with a temperature detecting device for detecting the temperature of the material in the underground solvent tank 500. When the aromatic extraction device stops running, the temperature of the material in the underground solvent tank 500 is high, and the material in the underground solvent tank 500 needs to be cooled first, and then transported into the wet solvent tank 400. In an embodiment, the aromatic extraction device further comprises a first branch 531 and a second branch 231, and the wet solvent tank 400 is provided with a fourth liquid inlet 420. One end of the first branch 531 is in communication with the third pipeline 530, and the other end of the first branch 531 is in communication with the first pipeline 130. One end of the second branch 231 is in communication with the second pipeline 230, and the other end of the second branch 231 is in communication with the fourth liquid inlet 420. The junction of the first branch 531 and the third pipeline 530 is referred to as a first junction, the junction of the first branch 531 and the first pipeline 130 is referred to as a second junction, and the junction of the second branch 231 and the second pipeline 230 is referred to as a third junction. The first junction is located between the second liquid outlet 522 and the third liquid inlet 410, and the second junction is located between the first liquid outlet 122 and the first liquid inlet 210.

[0033] Please refer to Figure 2 In an embodiment, the first pipeline 130 is provided with a first valve 131, the second pipeline 230 is provided with a second valve 232, the third pipeline 530 is provided with a third valve 532, the first branch 531 is provided with a fourth valve 5311, and the second branch 231 is provided with a fifth valve 2311. The first valve 131 is located between the first liquid outlet 122 and the second junction, the second valve 232 is located between the third junction and the second liquid inlet 310, and the third valve 532 is located between the first junction and the third liquid inlet 410. When the aromatic extraction device is normally working, the first valve 131, the second valve 232 and the third valve 532 are always open, and the fourth valve 5311 and the fifth valve 2311 are always closed. When the temperature of the material in the underground solvent tank 500 is high, the first valve 131, the second valve 232 and the third valve 532 are closed, and the fourth valve 5311 and the fifth valve 2311 are opened. The material in the underground solvent tank 500 is driven by the second solvent pump 520 to flow through the third pipeline 530, the first branch 531, the first pipeline 130, the cooling device 200, the second pipeline 230 and the second branch 231 in sequence, and is collected into the wet solvent tank 400 through the fourth liquid inlet 420. In this embodiment, the third pipeline 530 is provided with a one-way valve 533 to prevent the second solvent pump 520 from being sucked back. The water inlet of the one-way valve 533 is in communication with the second liquid outlet 522, and the water outlet of the one-way valve 533 is in communication with the junction of the third pipeline 530 and the first branch 531, i.e. the one-way valve 533 is located between the second liquid outlet 522 and the first junction.

[0034] Please refer to Figure 2In an embodiment, the aromatic hydrocarbon extraction device further comprises a solvent circulation device 600, the solvent circulation device 600 is provided with a fifth liquid inlet 610, the purification device 300 is provided with a fourth liquid outlet 320, and the fourth liquid outlet 320 is communicated with the fifth liquid inlet 610. The purified lean solvent is collected into the solvent circulation device 600 for recycling, so that the solvent is recycled. In another embodiment, the aromatic hydrocarbon extraction device further comprises a solvent supply tank 700 for supplementing the solvent to the wet solvent tank 400. The solvent supply tank 700 is provided with a fifth liquid outlet 710, and the fifth liquid outlet 710 is communicated with the third liquid inlet 410. In this embodiment, the aromatic hydrocarbon extraction device further comprises a fourth pipeline 720, the fifth liquid outlet 710 and the third liquid inlet 410 are communicated through the fourth pipeline 720, the fourth pipeline 720 is provided with a sixth valve 721, the sixth valve 721 is in a normally closed state, the sixth valve 721 is opened when it is necessary to supplement the solvent into the wet solvent tank 400, and the sixth valve 721 is closed after the supplement is completed.

[0035] The aromatic hydrocarbon extraction device of the utility model, the first solvent pump is arranged on the connecting pipeline between the first liquid outlet of the recovery tower and the first liquid inlet of the cooling device, or the connecting pipeline between the second liquid outlet of the cooling device and the second liquid inlet of the purification device, the lean solvent in the recovery tower is sucked into the purification device, and the regeneration of the lean solvent is realized, the second solvent pump is arranged on the connecting pipeline between the third liquid outlet of the underground solution tank and the third liquid inlet of the wet solvent tank, and the material in the underground solution tank is sucked into the wet solvent tank. The aromatic hydrocarbon extraction device of the present application can realize the independent regeneration of the lean solvent and the material collection of the underground solution tank, and the two do not interfere with each other, so that the lean solvent can be regenerated and purified on line, and reliable guarantee is provided for the long, full, safe, stable and optimal operation of the device. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

[0036] The above embodiments only exemplarily illustrate the principle and effect of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and category of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. An aromatic extraction apparatus, characterized by, The aromatics extraction device comprises: a recovery column (100) provided with a first liquid outlet (110); a cooling device (200) provided with a first liquid inlet (210) and a second liquid outlet (220), wherein the first liquid inlet (210) is communicated with the first liquid outlet (110); a purification device (300) provided with a second liquid inlet (310), wherein the second liquid inlet (310) is communicated with the second liquid outlet (220); a wet solvent tank (400) provided with a third liquid inlet (410); an underground solvent tank (500) provided with a third liquid outlet (510), wherein the third liquid outlet (510) is communicated with the third liquid inlet (410); a first solvent pump (120) arranged on a communication pipeline between the first liquid outlet (110) and the first liquid inlet (210) or a communication pipeline between the second liquid outlet (220) and the second liquid inlet (310), and used for pumping the lean solvent in the recovery column (100) into the purification device (300); a second solvent pump (520) arranged on a communication pipeline between the third liquid outlet (510) and the third liquid inlet (410), and used for pumping the material in the underground solvent tank (500) into the wet solvent tank (400).

2. The aromatic extraction device of claim 1, wherein, The first solvent pump (120) is provided with a first liquid suction port (121) and a first liquid discharge port (122), wherein the first liquid suction port (121) is communicated with the first liquid outlet (110), and the first liquid discharge port (122) is communicated with the first liquid inlet (210); the second solvent pump (520) is provided with a second liquid suction port (521) and a second liquid discharge port (522), wherein the second liquid suction port (521) is communicated with the third liquid outlet (510), and the second liquid discharge port (522) is communicated with the third liquid inlet (410).

3. The aromatic extraction device of claim 2, wherein, The aromatics extraction device comprises a first pipeline (130), a second pipeline (230) and a third pipeline (530), wherein the first liquid outlet (110) and the first liquid inlet (210) are communicated through the first pipeline (130); the second liquid outlet (220) and the second liquid inlet (310) are communicated through the second pipeline (230); and the third liquid outlet (510) and the third liquid inlet (410) are communicated through the third pipeline (530).

4. The aromatic extraction device of claim 3, wherein, The aromatics extraction device further comprises a first branch (531) and a second branch (231), wherein the wet solvent tank (400) is provided with a fourth liquid inlet (420); one end of the first branch (531) is communicated with the third pipeline (530), and the other end of the first branch (531) is communicated with the first pipeline (130); one end of the second branch (231) is communicated with the second pipeline (230), and the other end of the second branch (231) is communicated with the fourth liquid inlet (420).

5. The aromatic extraction device of claim 1, wherein, The aromatic hydrocarbon extraction device further comprises a solvent circulation device (600) provided with a fifth liquid inlet (610), and the purification device (300) is provided with a fourth liquid outlet (320) in communication with the fifth liquid inlet (610).

6. The aromatic extraction device of claim 3, wherein, The aromatic hydrocarbon extraction device further comprises a solvent make-up tank (700) for supplementing solvent to the wet solvent tank (400), and the solvent make-up tank (700) is provided with a fifth liquid outlet (710) in communication with the third liquid inlet (410).

7. The aromatic extraction device of claim 6, wherein, The aromatic hydrocarbon extraction device further comprises a fourth pipeline (720) having one end in communication with the fifth liquid outlet (710) and the other end in communication with the third pipeline (530).

8. The aromatic extraction device of claim 4, wherein, The third pipeline (530) is provided with a one-way valve (533) having a water inlet in communication with the second liquid outlet (522) and a water outlet in communication with the junction of the third pipeline (530) and the first branch (531).

9. The aromatic extraction device of claim 1, wherein, The underground solvent tank (500) is provided with a liquid level meter for measuring the material level in the underground solvent tank (500).

10. The aromatic extraction device of claim 1, wherein, The underground solvent tank (500) is provided with a temperature detection device for detecting the temperature of the material in the underground solvent tank (500). The underground solvent tank (500) is provided with a liquid level meter for measuring the material level in the underground solvent tank (500). The underground solvent tank (500) is provided with a temperature detection device for detecting the temperature of the material in the underground solvent tank (500).

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