Production system for preparing tetrahydrofuran based on LBDO

Abstract

The utility model provides a production system for preparing tetrahydrofuran based on LBDO. The production system comprises a separation tower, a condenser and a water circulation unit, the condenser is provided with a heating medium inlet, a heating medium outlet, a refrigerant inlet and a refrigerant outlet. And a heating medium inlet of the condenser is connected with a tower top outlet of the separation tower. The water circulation unit is connected with a refrigerant inlet of the condenser and a refrigerant outlet of the condenser, the water circulation unit and the condenser define a closed-loop channel for circulation of water for condensation, and the water circulation unit can cool water guided out of the refrigerant outlet of the condenser and send the cooled water into the condenser. According to the production system for preparing tetrahydrofuran based on LBDO provided by the utility model, the condensation water is recycled, so that the condensation water can be effectively prevented from scaling in the condenser, the condensation effect of the condenser is further ensured, the operation of the separation tower is safe, stable and easy to control, the energy consumption can be reduced, and the practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of tetrahydrofuran production, and particularly relates to a production system for preparing tetrahydrofuran based on LBDO. Background Art

[0002] Tetrahydrofuran (THF), abbreviated as THF, is an important raw material for organic synthesis and a high-performance solvent, known as the "universal solvent." THF is primarily produced via the cyclodehydration method of 1,4-butanediol (BDO). This method is widely adopted due to its simplicity, low reaction temperature, and high THF yield. To further reduce production costs and address the issue of handling the BDO wastewater (LEDO, containing approximately 10-40% BDO) from BDO production, THF production is now being conducted using BDO wastewater (LBDO). This involves extracting the BDO from the LBDO and then converting it into THF.

[0003] In the prior art, after methanol is removed from BDO wastewater, condensers are typically installed at the tops of separation towers, such as the methanol refining tower, the THF refining dehydration tower, and the THF deweighting tower. These condensers use external condensation water as a cooling source. Due to the quality of the cooling water, varying degrees of scaling will form on the condenser heat exchange tubes. This results in poor heat exchange efficiency over time, impacting condensation performance, which in turn increases pressure and temperature within the separation tower, impairing separation performance. To maintain condensation and separation performance, the condenser's circulating water volume must be continuously increased, exacerbating scaling and creating a vicious cycle. This also increases energy consumption and reduces practicality. Utility Model Content

[0004] The present invention provides a production system for preparing tetrahydrofuran from LBDO, aiming to solve the problem of poor practicality caused by the cooling method used in the separation tower in the existing process of preparing tetrahydrofuran from BDO waste liquid (LBDO) due to its inability to adapt to the water quality of the external water source.

[0005] To achieve the above-mentioned object, the technical solution adopted by the present invention is to provide a production system for preparing tetrahydrofuran based on LBDO, comprising:

[0006] Separation tower;

[0007] The condenser has a heat medium inlet, a heat medium outlet, a refrigerant inlet, and a refrigerant outlet; the heat medium inlet of the condenser is connected to the top outlet of the separation tower;

[0008] The water circulation unit is respectively connected to the refrigerant inlet and the refrigerant outlet of the condenser. The water circulation unit and the condenser form a closed-loop channel for the circulation of condensing water. The water circulation unit is used to cool the condensing water discharged from the refrigerant outlet of the condenser and send the cooled condensing water into the condenser.

[0009] In a possible implementation, the water circulation unit includes:

[0010] A water storage tank having a water inlet, a water outlet and a water supply port; the water inlet of the water storage tank is connected to the heat medium outlet of the condenser;

[0011] The heat conversion element has a heat medium channel and a refrigerant channel, wherein the heat medium channel of the heat conversion element is connected to the water outlet of the water storage tank and to the refrigerant inlet of the condenser; the refrigerant channel of the heat conversion element is used to connect to an external heat unit;

[0012] A circulation pump is arranged on the connecting pipeline between the water storage tank and the heat conversion element.

[0013] In a possible implementation, the water circulation unit further includes a cooling structure, which is provided on a connecting pipeline between the heat conversion element and the refrigerant inlet of the condenser, and is used to further cool the condensed water flowing out of the heat conversion element.

[0014] In a possible implementation, the cooling structure includes:

[0015] a bellows having a cavity and provided with an air inlet and an air outlet communicating with the cavity;

[0016] a fan, arranged at the air inlet;

[0017] a heat sink disposed in the cavity, the heat sink having a water channel connected to the heat medium channel of the heat conversion element and the refrigerant inlet of the condenser;

[0018] The fan blows air toward the heat sink, and the water in the water channel is cooled by heat exchange between the air and the heat sink.

[0019] In a possible implementation, a plurality of fans are provided.

[0020] In a possible implementation, the heat dissipating elements are arranged at intervals along the air outlet direction of the fan.

[0021] In one possible implementation, the heat dissipation element includes:

[0022] There are multiple branch pipes, each branch pipe is parallel and spaced apart, and the spacing direction of each branch pipe is perpendicular to the air outlet direction of the fan;

[0023] There are two main pipes, which are respectively located at the two ends of each branch pipe, one of which is connected to one end of each branch pipe, and the other is connected to the other end of each branch pipe; one of the main pipes is provided with a main pipe inlet for connecting to the heat medium channel of the heat conversion element, and the other is provided with a main pipe outlet for connecting to the refrigerant inlet of the condenser; each main pipe and each branch pipe are combined to form the water channel.

[0024] In one possible implementation, the LBDO-based production system for preparing tetrahydrofuran further includes:

[0025] A cooler, the cooler having a heat medium inlet, a heat medium outlet, a refrigerant inlet, and a refrigerant outlet; the heat medium inlet of the cooler is connected to the heat medium outlet of the condenser; the refrigerant inlet of the condenser and the refrigerant outlet of the condenser are used to be connected to an external cooling water supply unit;

[0026] The collecting tank is connected to the heat medium outlet of the cooler to collect the liquid product.

[0027] In a possible implementation, the collecting tank is provided with a discharge port, and the discharge port is connected to the separation tower via a reflux pipeline; and a delivery pump is provided on the reflux pipeline.

[0028] In this implementation, the condenser connected to the top outlet of the separation tower can ensure the condensation of gaseous substances and the collection of subsequent products. The water circulation unit can realize the recycling of condensation water through the closed-loop channel formed by the combination with the condenser, effectively preventing the condensation water from scaling in the condenser, thereby ensuring the condensation effect of the condenser, reducing energy consumption, conforming to the concept of low-carbon circulation, and having strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a production system for preparing tetrahydrofuran based on LBDO provided in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the water storage tank structure of a production system for preparing tetrahydrofuran based on LBDO provided in an embodiment of the present utility model;

[0031] Figure 3 A schematic diagram of a cooling structure of a production system for preparing tetrahydrofuran based on LBDO provided in an embodiment of the present invention;

[0032] Figure 4A schematic diagram of the planar structure of a heat sink for a production system for preparing tetrahydrofuran based on LBDO provided in an embodiment of the present invention;

[0033] Description of reference numerals:

[0034] 10. Separation tower;

[0035] 20. Condenser;

[0036] 30. Water circulation unit; 31. Water storage tank; 311. Water inlet; 312. Water outlet; 313. Water supply port; 32. Heat conversion element; 33. Circulation pump; 34. Cooling structure; 341. Bellows; 342. Fan; 343. Heat dissipation element; 344. Branch pipe; 345. Main pipe; 346. Air inlet; 347. Air outlet;

[0037] 40. Cooler;

[0038] 50. Collection tank; 51. Return line; 52. Delivery pump. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] See also Figure 1 The production system for preparing tetrahydrofuran based on LBDO provided by the present invention is now described. The production system for preparing tetrahydrofuran based on LBDO includes a separation tower 10, a condenser 20, and a water circulation unit 30. The condenser 20 has a heat medium inlet, a heat medium outlet, a refrigerant inlet, and a refrigerant outlet. The heat medium inlet of the condenser 20 is connected to the top outlet of the separation tower 10. The water circulation unit 30 is connected to the refrigerant inlet and the refrigerant outlet of the condenser 20, respectively. The water circulation unit 30 and the condenser 20 enclose a closed-loop channel for circulating condensed water. The water circulation unit 30 is capable of cooling the condensed water discharged from the refrigerant outlet of the condenser 20 and feeding the cooled condensed water into the condenser 20.

[0041] Compared to the prior art, the LBDO-based tetrahydrofuran production system provided in this embodiment features a condenser 20 connected to the top outlet of separation tower 10, ensuring condensation of gaseous substances and collection of subsequent products. Furthermore, the water circulation unit 30, combined with the condenser 20 to form a closed-loop channel, recycles the condensation water, effectively preventing scaling of the condensation water in the condenser 20, thereby ensuring the condensation efficiency of the condenser 20 and reducing energy consumption. This system is in line with the concept of low-carbon recycling and highly practical.

[0042] As a specific condensation principle, soft water may be injected into the closed-loop channel, and the soft water may be circulated to effectively avoid scaling inside the condenser 20 .

[0043] Regarding the separation tower 10 in this embodiment, it can be any one, two, or three of a methanol refining tower, a dehydration tower, and a weight removal tower. This technology is the existing technology for preparing tetrahydrofuran from LBDO and will not be described in detail here.

[0044] In some embodiments, the water circulation unit 30 may be configured as follows: Figure 1 and Figure 2 The structure shown. Figure 1 and Figure 2 The water circulation unit 30 includes a water tank 31, a heat conversion element 32 and a circulation pump 33. The water tank 31 has a water inlet 311, a water outlet 312 and a water supply port 313. The water inlet 311 of the water tank 31 is connected to the heat medium outlet of the condenser 20. The heat conversion element 32 has a heat medium channel and a refrigerant channel. The heat medium channel of the heat conversion element 32 is connected to the water outlet 312 of the water tank 31 and is connected to the refrigerant inlet of the condenser 20. The refrigerant channel of the heat conversion element 32 can be connected to an external heat-using unit. The circulation pump 33 is arranged on the connecting pipeline between the water tank 31 and the heat conversion element 32.

[0045] The water storage tank 31 can receive the condensed water transmitted from the refrigerant outlet of the condenser 20. The temperature of the condensed water in the water storage tank 31 is relatively high. Therefore, under the push of the circulating pump 33, the water in the water storage tank 31 can be sent to the heat conversion component 32. The heat conversion component 32 is connected to the external heat unit, and can send heat to the heat unit through heat exchange, and the cooled condensed water can be sent to the refrigerant inlet of the condenser 20.

[0046] It should be noted that the heat conversion element 32 can be a heat exchanger, specifically a fixed tube-and-sheet heat exchanger or any other heat exchanger structure. The heat-using unit can be heating equipment installed in production workshops, auxiliary workshops, utility areas, living quarters, and office areas, such as hot water rooms and heating equipment. The heat conversion element 32 exchanges the heat of the condensed water within the closed-loop channel, ensuring heat reuse and conserving resources.

[0047] The structure of the water circulation unit 30 ensures the recycling of condensation water, effectively preventing scaling in the condenser 20 and ensuring condensation efficiency. It also ensures that heat is delivered to the heat-using unit via the heat conversion element 32, achieving heat recovery and reducing energy consumption, thus achieving high practicality.

[0048] The water replenishment port 313 provided on the water storage tank 31 can ensure that when condensation water is lost in the closed-loop channel, supplementary condensation water is injected into the closed-loop channel to ensure stable operation of the condensation work and further ensure the condensation effect.

[0049] In this embodiment, the water inlet 311 and the water replenishment port 313 may be located at the top of the water storage tank 31, and the water storage port may be located at the bottom of the water storage tank 31. A temperature detection sensor and a liquid level monitor may also be provided in the water storage tank 31 to monitor the water temperature and level in the water storage tank 31, thereby ensuring stable, safe, and controllable operation of the condensation process.

[0050] In addition, in this embodiment, the water storage tank 31, the circulating pump 33, the heat conversion element 32, and the condenser 20 involved can be connected by connecting pipes. Temperature monitors can be installed at the refrigerant inlet and refrigerant outlet of the condenser 20 to ensure real-time monitoring of the temperature of the condensing water.

[0051] In some embodiments, the water circulation unit 30 may be configured as follows: Figure 1 The structure shown. Figure 1 The water circulation unit 30 also includes a cooling structure 34, which is arranged on the connecting pipeline between the heat conversion element 32 and the refrigerant inlet of the condenser 20, and can further cool the condensed water flowing out of the heat conversion element 32.

[0052] The cooling structure 34 can further cool the condensation water after the condensation water is discharged from the heat conversion element 32 , thereby effectively ensuring the condensation effect of the condenser 20 .

[0053] The above-mentioned closed-loop channel is formed by a combination of a water storage tank 31, a circulation pump 33, a heat conversion element 32, a cooling structure 34, a condenser 20 and corresponding connecting pipes, for the circulation of condensation water.

[0054] In some embodiments, the cooling structure 34 may be configured as follows: Figure 3 The structure shown. Figure 3 The cooling structure 34 includes a bellows 341, a fan 342, and a heat sink 343. Bellows 341 has a cavity and is provided with an air inlet 346 and an air outlet 347 communicating with the cavity. Fan 342 is located at air inlet 346. Heat sink 343 is disposed in the cavity and has a water channel that communicates with the heat medium channel of heat conversion element 32 and the refrigerant inlet of condenser 20, respectively.

[0055] Specifically, the fan 342 blows air toward the heat sink 343 , and the water in the water channel is cooled by heat exchange between the air and the heat sink 343 .

[0056] The bellows 341 can ensure the installation of the heat sink 343 and provide a channel for air flow. The fan 342 can blow air with a certain flow rate into the bellows 341. Through the flow of air, the air contacts the heat sink 343 and performs heat exchange, thereby further cooling the condensed water in the heat sink 343.

[0057] In this embodiment, the temperature of the air blown in by the fan 342 needs to be lower than the temperature of the condensing water in the heat sink 343, thereby ensuring a secondary cooling effect.

[0058] It should be noted that the air inlet 346 and the air outlet 347 of the bellows 341 can both be connected to the external atmosphere. Regarding the temperature of the incoming air, in order to adapt to the high temperature weather in the external environment, a refrigeration module, such as a refrigeration and air-conditioning unit, can be set at the air inlet 346.

[0059] In some embodiments, the fan 342 may be configured as follows: Figure 3 The structure shown. Figure 3 There are multiple fans 342, and the setting of multiple fans 342 can ensure the increase of gas flow rate, thereby ensuring the cooling effect.

[0060] Specifically, the number of fans 342 can be adjusted based on the seasons or the temperature of the condensing water. For example, in winter, only one fan 342 can be turned on, while in summer, all fans 342 need to be turned on to ensure condensation. Of course, when the temperature of the condensing water discharged from the heat conversion element 32 is low, only one fan 342 can be turned on, or none at all. When the temperature of the condensing water discharged from the heat conversion element 32 is high, multiple or all fans 342 can be turned on.

[0061] In some embodiments, the heat sink 343 may be formed as follows: Figure 3 See the structure shown. Figure 3 There are multiple heat dissipation elements 343, and each heat dissipation element 343 is arranged at intervals along the air outlet direction of the fan 342.

[0062] The plurality of heat sinks 343 can further ensure the heat dissipation effect, thereby ensuring that the temperature of the condensing water is further reduced. In addition, the plurality of heat sinks 343 are arranged at intervals along the wind direction, which can ensure that the airflow can contact all the heat sinks 343 during the flow, thereby ensuring the cooling effect.

[0063] In some embodiments, the heat sink 343 may be formed as follows: Figure 4 The structure shown. Figure 4The heat sink 343 includes a branch pipe 344 and a main pipe 345. There are multiple branch pipes 344, each branch pipe 344 is arranged in parallel and at intervals, and the spacing direction of each branch pipe 344 is arranged perpendicular to the air outlet direction of the fan 342. There are two main pipes 345, which are respectively located at the two ends of each branch pipe 344, one main pipe 345 is connected to one end of each branch pipe 344, and the other main pipe 345 is connected to the other end of each branch pipe 344. One of the main pipes 345 is provided with a main pipe 345 inlet that can be connected to the heat medium channel of the heat conversion element 32, and the other main pipe 345 is provided with a main pipe 345 outlet that can be connected to the refrigerant inlet of the condenser 20. Each main pipe 345 and each branch pipe 344 are combined to form a water channel.

[0064] Each branch pipe 344 is spaced apart and connected to both main pipes 345. This structure increases the heat exchange area, i.e., the contact area with the airflow, thereby ensuring a cooling effect. Furthermore, a gap for airflow is formed between any two adjacent branch pipes 344, ensuring the passage of airflow and, therefore, ensuring a heat exchange effect on each branch pipe 344.

[0065] It should be noted that the diameter of the branch pipe 344 may be smaller than the diameter of the main pipe 345 .

[0066] In this embodiment, a preferred implementation is that the heat sinks 343 can be arranged parallel to each other vertically, with the fan 342 located below each heat sink 343; or the heat sinks 343 can be arranged vertically, with the fan 342 located to one side of each heat sink 343. Regardless of the arrangement, the airflow from the fan 342 (the bellows 341) is directed directly toward each heat sink 343, or in other words, the airflow is perpendicular to the plane in which the branch pipes 344 are located.

[0067] In some embodiments, see Figure 1 The LBDO-based tetrahydrofuran production system further includes a cooler 40 and a collection tank 50. The cooler 40 has a heat medium inlet, a heat medium outlet, a refrigerant inlet, and a refrigerant outlet. The heat medium inlet of the cooler 40 is connected to the heat medium outlet of the condenser 20. The refrigerant inlet and refrigerant outlet of the cooler 40 can be connected to an external cooling water supply unit. The collection tank 50 is connected to the heat medium outlet of the cooler 40 to collect the liquid product.

[0068] The cooler 40 can cool the liquid substance transmitted from the condenser 20, and can also re-condense some of the gaseous substances transmitted from the condenser 20, thereby improving the collection rate of the product. This involves the condenser 20 lowering the temperature of the substance discharged from the separation tower 10, so the temperature of the substance entering the cooler 40 is relatively low, so the scaling phenomenon in the cooler 40 can be basically ignored.

[0069] Regarding the cooling water supply unit, it can be a water supply structure connecting the refrigerant inlet and the refrigerant outlet of the cooler 40, which can specifically include pipelines and water pumps. At the same time, the pipeline corresponding to the refrigerant inlet of the cooler 40 can be connected to a sink or a pool, etc.

[0070] In some embodiments, the collection tank 50 may be formed as follows: Figure 1 The structure shown. Figure 1 The collecting tank 50 is provided with a discharge port, which is connected to the separation tower 10 through a reflux pipeline 51; a delivery pump 52 is provided on the reflux pipeline 51.

[0071] The pressure and temperature in the separation tower 10 will increase. At this time, part of the cooled liquid material can be transported to the separation tower 10 through the reflux pipe 51 and the delivery pump 52, thereby reducing the temperature and pressure in the separation tower 10, meeting the production process requirements, making the separation process of the separation tower safe, stable and easy to control, and significantly improving the product separation effect and product quality.

[0072] In this embodiment, an on-off valve may be provided on the return line 51. Furthermore, a product discharge line may be provided on the return line 51, and an on-off valve may be provided on the product discharge line.

[0073] As a specific embodiment of the production system for preparing tetrahydrofuran based on LBDO provided by the utility model:

[0074] Example 1

[0075] Soft water is then added to the closed-loop channel via water storage tank 31 for condensation. Simultaneously, heat conversion element 32, cooling structure 34, and circulation pump 33 are activated. 95% of the THF gas is discharged from the top of separation tower 10 and passes through condenser 20 and cooler 40 to produce 95% THF liquid. The THF liquid enters collection tank 50, with a portion of the THF liquid flowing back to separation tower 10 via reflux line 51. The top temperature of separation tower 10 is maintained at 70°C and the pressure at 8 kPa, ensuring efficient THF separation.

[0076] Example 2

[0077] Soft water is then added to the closed-loop channel via water storage tank 31 for condensation. Simultaneously, heat conversion element 32, cooling structure 34, and circulation pump 33 are activated. 99.99% THF gas is discharged from the top of separation tower 10 and passes through condenser 20 and cooler 40 to produce 99.99% THF liquid. The THF liquid enters collection tank 50, with a portion of the THF liquid flowing back to separation tower 10 via reflux line 51. The top temperature of separation tower 10 is maintained at 68°C and the pressure at 7 kPa, ensuring efficient THF separation.

[0078] As a specific embodiment of the condenser 20 and the cooler 40 in the production system for preparing tetrahydrofuran based on LBDO provided by the present invention, the temperature of the condensing water entering the refrigerant inlet of the condenser 20 can be 39°C, and the temperature of the condensing water discharged from the refrigerant outlet of the condenser 20 can be 49°C; and the cooling water entering the refrigerant inlet of the cooler 40 can be room temperature water, and the temperature of the cooling water discharged from the refrigerant outlet of the cooler 40 can be 29°C.

[0079] Of course, the condensation cooling structure adopted by the production system for preparing tetrahydrofuran based on LBDO provided by the present invention can also be applied to the heat exchange problem of the separation tower 10 of other production systems and is applicable to the separation of other products.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A production system for preparing tetrahydrofuran based on LBDO, characterized in that: include: Separation tower; The condenser has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; The heat medium inlet of the condenser is connected to the top outlet of the separation tower; The water circulation unit is respectively connected to the refrigerant inlet and the refrigerant outlet of the condenser. The water circulation unit and the condenser form a closed-loop channel for the circulation of condensing water. The water circulation unit is used to cool the condensing water discharged from the refrigerant outlet of the condenser and send the cooled condensing water into the condenser.

2. The production system for preparing tetrahydrofuran based on LBDO according to claim 1, characterized in that: The water circulation unit comprises: A water storage tank having a water inlet, a water outlet and a water supply port; the water inlet of the water storage tank is connected to the heat medium outlet of the condenser; The heat conversion element has a heat medium channel and a refrigerant channel, wherein the heat medium channel of the heat conversion element is connected to the water outlet of the water storage tank and to the refrigerant inlet of the condenser; the refrigerant channel of the heat conversion element is used to connect to an external heat unit; A circulation pump is arranged on the connecting pipeline between the water storage tank and the heat conversion element.

3. The production system for preparing tetrahydrofuran based on LBDO according to claim 2, characterized in that: The water circulation unit further includes a cooling structure, which is provided on a connecting pipeline between the heat conversion element and the refrigerant inlet of the condenser and is used to further cool the condensed water flowing out of the heat conversion element.

4. The production system for preparing tetrahydrofuran based on LBDO according to claim 3, characterized in that: The cooling structure comprises: a bellows having a cavity and provided with an air inlet and an air outlet communicating with the cavity; a fan, arranged at the air inlet; a heat sink disposed in the cavity, the heat sink having a water channel connected to the heat medium channel of the heat conversion element and the refrigerant inlet of the condenser; The fan blows air toward the heat sink, and the water in the water channel is cooled by heat exchange between the air and the heat sink.

5. The production system for preparing tetrahydrofuran based on LBDO according to claim 4, characterized in that: There are multiple fans.

6. The production system for preparing tetrahydrofuran based on LBDO according to claim 4, characterized in that: There are a plurality of heat dissipating elements, and each of the heat dissipating elements is arranged at intervals along the air outlet direction of the fan.

7. The production system for preparing tetrahydrofuran based on LBDO according to claim 4, characterized in that: The heat sinks include: There are multiple branch pipes, each branch pipe is parallel and spaced apart, and the spacing direction of each branch pipe is perpendicular to the air outlet direction of the fan; There are two main pipes, which are respectively located at the two ends of each branch pipe, one of which is connected to one end of each branch pipe, and the other is connected to the other end of each branch pipe; one of the main pipes is provided with a main pipe inlet for connecting to the heat medium channel of the heat conversion element, and the other is provided with a main pipe outlet for connecting to the refrigerant inlet of the condenser; each main pipe and each branch pipe are combined to form the water channel.

8. The production system for preparing tetrahydrofuran based on LBDO according to any one of claims 1 to 7, characterized in that: The production system for preparing tetrahydrofuran based on LBDO also includes: A cooler, the cooler having a heat medium inlet, a heat medium outlet, a refrigerant inlet, and a refrigerant outlet; the heat medium inlet of the cooler is connected to the heat medium outlet of the condenser; the refrigerant inlet of the condenser and the refrigerant outlet of the condenser are used to be connected to an external cooling water supply unit; The collecting tank is connected to the heat medium outlet of the cooler to collect the liquid product.

9. The production system for preparing tetrahydrofuran based on LBDO according to claim 8, characterized in that: The collecting tank is provided with a discharge port, which is connected to the separation tower via a reflux pipeline; a delivery pump is provided on the reflux pipeline.

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