Tetrahydrofuran purification system

Abstract

The tetrahydrofuran purification system comprises a recovery tower, a plurality of stages of circulating recovery mechanisms are sequentially arranged in the recovery tower from bottom to top, each circulating recovery mechanism comprises a spraying assembly, an adsorption assembly and a storage cavity, the spraying assemblies are located above the adsorption assemblies, the storage cavities are located below the adsorption assemblies, and the spraying assemblies are located above the adsorption assemblies. The storage cavity is connected with the spraying assembly through a pipeline; the storage cavity of the first-stage recycling mechanism located at the bottom end of the recycling tower is arranged at the bottom end in the recycling tower, and the bottom end of the recycling tower is provided with an air inlet and is communicated with the storage cavity of the first-stage recycling mechanism through the air inlet; the storage cavity of the circulation recovery mechanism located above the first-stage circulation recovery mechanism is arranged on the outer side of the recovery tower, liquid collecting assemblies are arranged in the circulation recovery mechanisms located above the first-stage circulation recovery mechanism, and the liquid collecting assemblies are located below the adsorption assemblies of the circulation recovery mechanisms; and the liquid collecting assembly is connected with the storage cavity of the recycling mechanism through a pipeline.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pharmaceutical production especially relates to a tetrahydrofuran purification system. BACKGROUND

[0002] Tetrahydrofuran is a heterocyclic organic compound, molecular formula is C4H8O, belongs to ether, is aromatic compound furan's complete hydrogenation product, is a colorless volatile liquid, has the smell similar to ethyl ether, can be mixed with water, has the small viscidity of atmospheric pressure under normal temperature, the chemical formula of this cyclic ether can be written as (CH2)4O, because its liquid range is very long, so it is a commonly used moderate polarity aprotic solvent, its main use is as a precursor of high polymer, although the smell and chemical property of THF are very similar with ethyl ether, but the anesthetic effect is very poor, in industrial production, the waste gas containing tetrahydrofuran is produced, the tetrahydrofuran in the waste gas needs to be recovered, otherwise, not only will pollute the environment, but also will cause the waste of resources.

[0003] Patent No. ZL202210221031.4 discloses a device for recovering tetrahydrofuran, which completely adsorbs tetrahydrofuran by activated carbon particles. Due to the low adsorption efficiency of activated carbon particles, the recovery and purification process of tetrahydrofuran is long, which seriously affects the recovery and purification efficiency of tetrahydrofuran. In addition, it is found that during use, the single layer of activated carbon particles cannot completely remove tetrahydrofuran from the waste gas, and the recovery and purification effect is poor, which cannot meet the emission standard of gas. It is necessary to improve it. SUMMARY

[0004] The utility model aims at above -mentioned problem, provides a tetrahydrofuran purification system with simple structure and improved resource utilization.

[0005] To achieve the above object, the technical scheme of the utility model is:

[0006] A tetrahydrofuran purification system, comprising a recovery tower, a plurality of stages of circulating recovery mechanisms are sequentially arranged in the recovery tower from bottom to top, the circulating recovery mechanism comprises a spraying assembly, an adsorption assembly and a storage cavity, the spraying assembly is located above the adsorption assembly, the storage cavity is located below the adsorption assembly, and the storage cavity and the spraying assembly are connected by a pipeline; the storage cavity of the first stage of circulating recovery mechanisms located at the bottom end of the recovery tower is arranged inside the bottom end of the recovery tower, the bottom end of the recovery tower is provided with an air inlet, and the air inlet is connected with the storage cavity of the first stage of circulating recovery mechanisms; the storage cavities of the circulating recovery mechanisms located above the first stage of circulating recovery mechanisms are arranged outside the recovery tower, each of the circulating recovery mechanisms located above the first stage of circulating recovery mechanisms is provided with a liquid collecting assembly, the liquid collecting assembly is located below the adsorption assembly of the circulating recovery mechanism, and the liquid collecting assembly is connected with the storage cavity of the circulating recovery mechanism by a pipeline.

[0007] Furthermore, the recovery tower is provided with four-stage circulation recovery mechanisms from bottom to top: a first-stage circulation mechanism, a second-stage circulation mechanism, a third-stage circulation mechanism, and a fourth-stage circulation mechanism. The storage cavity in the first-stage circulation mechanism is located at the bottom of the recovery tower. The storage cavities of the second-stage, third-stage, and fourth-stage circulation mechanisms are independently located on the outside of the recovery tower. Each of the second-stage, third-stage, and fourth-stage circulation mechanisms is provided with a liquid collection assembly, which is connected to the storage cavity of the corresponding circulation mechanism.

[0008] Furthermore, the spray assembly includes a spray pipe, spray heads, and a circulation pump. One end of the spray pipe is connected to the circulation pump, and the other end of the spray pipe extends into the recovery tower and is sealed. There are several spray heads, all located inside the recovery tower and evenly spaced along the length of the spray pipe. The spray heads are connected to the side wall of the spray pipe. The other end of the circulation pump is connected to the storage chamber of its respective circulation mechanism.

[0009] Furthermore, the adsorption assembly includes a filter base plate and an adsorbent material. The filter base plate is fixedly connected to the inner wall of the recovery tower and is located below the spray head. The adsorbent material is placed on the recovery tower to form a packing layer. The filter base plate is evenly arranged with clearance holes to allow gas to pass through.

[0010] Furthermore, the liquid collection assembly includes an annular liquid collection component, a support frame, and a shielding component; the annular liquid collection component is disposed below the filter base plate, and its outer periphery is fixedly connected to the inner wall of the recovery tower, forming a liquid collection channel along the inner periphery of the recovery tower. The liquid collection channel is connected to the storage chamber pipeline of the corresponding circulation mechanism; a shielding component is fixedly connected to the upper end of the annular liquid collection component through the support frame. The shielding component is arranged in an umbrella shape, and the bottom edge of the shielding component is located above the liquid collection channel.

[0011] Furthermore, the tetrahydrofuran purification system also includes a connecting component; the connecting component includes a primary connecting pipe, a secondary connecting pipe, a tertiary connecting pipe, and a wastewater discharge pipe; the two ends of the primary connecting pipe are respectively connected to the storage chambers of the first-stage circulation mechanism and the second-stage circulation mechanism; the two ends of the secondary connecting pipe are respectively connected to the storage chambers of the second-stage circulation mechanism and the third-stage circulation mechanism; the tertiary connecting pipe is respectively connected to the storage chambers of the third-stage circulation mechanism and the fourth-stage circulation mechanism; each of the primary, secondary, and tertiary connecting pipes is equipped with a liquid guiding pump; the two ends of the wastewater discharge pipe are respectively connected to the storage chamber of the first-stage circulation mechanism and the wastewater collection cylinder, and discharge the wastewater accumulated in the storage chamber of the first-stage circulation mechanism into the wastewater collection cylinder.

[0012] Furthermore, the tetrahydrofuran purification system also includes an air intake assembly; the air intake assembly includes an air intake liquid seal tank and an exhaust gas pipeline. The air intake liquid seal tank is a sealed cavity and contains tap water. One end of the exhaust gas pipeline is connected to the exhaust gas generating equipment, and the other end of the exhaust gas pipeline extends into the air intake liquid seal tank and into the tap water. An air outlet is provided at the top of the air intake liquid seal tank, and the air outlet is connected to an air inlet pipeline located at the bottom of the recovery tower. A first tap water inlet is provided on one side of the top of the air intake liquid seal tank and is connected to a tap water pipeline through the first tap water inlet.

[0013] Furthermore, the tetrahydrofuran purification system also includes an exhaust component; the exhaust component includes an exhaust liquid seal tank and a purified gas pipeline; the exhaust liquid seal tank is a sealed cavity containing tap water; one end of the purified gas pipeline is connected to the purified gas outlet located at the top of the adsorption tower, and the other end of the purified gas pipeline extends into the exhaust liquid seal tank and into the tap water; an exhaust port is located at the center of the top of the exhaust liquid seal tank, and the exhaust port is connected to the gas-using equipment pipeline; a second tap water inlet is located on one side of the top of the exhaust liquid seal tank and is connected to the tap water pipeline through the second tap water inlet; a liquid guide port is located on one side of the middle of the exhaust liquid seal tank, and the liquid guide port is connected to the storage cavity of the fourth-stage circulation mechanism through a four-stage connecting pipeline.

[0014] Furthermore, the tetrahydrofuran purification system also includes a condensation assembly; the condensation assembly includes a first condenser and a second condenser, the first condenser being connected to the spray pipe in the first-stage circulation mechanism and performing a cooling operation on the spray pipe; the second condenser being connected to the spray pipe in the fourth-stage circulation mechanism and performing a cooling operation on the spray pipe; the inlet of the first condenser is connected to the condensate supply equipment pipeline, the outlet of the first condenser is connected to the inlet pipeline of the second condenser, and the outlet of the second condenser is connected to the condensate supply equipment pipeline.

[0015] Furthermore, level gauges are installed in the storage cavities of the inlet liquid seal tank, the outlet liquid seal tank, and the first-stage circulation mechanism, the second-stage circulation mechanism, the third-stage circulation mechanism, and the fourth-stage circulation mechanism to monitor the internal liquid level.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are:

[0017] In operation, the spray water in the first-stage circulation mechanism enters the packing layer. The gas containing tetrahydrofuran rises after entering the bottom of the recovery tower and passes through the packing layer. The tetrahydrofuran in the gas dissolves in the water and falls into the storage chamber at the bottom of the recovery tower. The water continues to spray through the circulation pump. When the tetrahydrofuran content in the water in the storage chamber reaches a certain level, it is discharged and collected. The gas passing through the packing layer of the first-stage circulation mechanism re-enters the packing layer of the second-stage circulation mechanism. The packing layer of the second-stage circulation mechanism is also wetted by the spray water, allowing the gas to pass through the wetted packing layer again. The water in the packing layer absorbs the tetrahydrofuran in the gas again. This process is repeated, allowing the gas containing tetrahydrofuran to pass through the packing layers of the first, second, third, and fourth-stage circulation mechanisms in sequence before being discharged from the recovery tower. This achieves the tetrahydrofuran purification and recovery effect of the first, second, third, and fourth-stage circulation mechanisms in the gas.

[0018] In this operation, when the gas containing tetrahydrofuran passes through the packing layer wetted by sprayed water, its passage rate is low, which prolongs the contact time between the gas and water and increases the contact area between the tetrahydrofuran and water. This allows the tetrahydrofuran in the gas to dissolve into the water and be collected as much as possible. Furthermore, this invention uses a multi-layer circulation mechanism to recover and purify the tetrahydrofuran in the gas, which can completely remove the tetrahydrofuran from the gas, so that the gas discharged from the recovery tower can meet the emission or reuse standards, and has a better recovery and purification effect. At the same time, compared with the activated carbon adsorption operation in the prior art, the entire recovery and purification process of this technical solution is shorter, which effectively improves the recovery and purification efficiency of tetrahydrofuran and has excellent market promotion prospects. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the intake assembly.

[0022] Figure 3 This is a cross-sectional view of the recovery tower;

[0023] Figure 4 for Figure 3A magnified view of the local structure. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art to all other embodiments obtained without creative effort should be included within the protection scope of the present utility model.

[0025] like Figures 1 to 4 As shown, this embodiment discloses a tetrahydrofuran purification system, including a recovery tower. The recovery tower 1 has four-stage circulation recovery mechanisms arranged from bottom to top, namely the first-stage circulation mechanism 2, the second-stage circulation mechanism 3, the third-stage circulation mechanism 4, and the fourth-stage circulation mechanism 5. Each stage of the circulation recovery mechanism includes a spray assembly, an adsorption assembly, and a storage chamber. The spray assembly is located above the adsorption assembly, and the storage chamber is located below the adsorption assembly. The storage chamber and the spray assembly are connected by a pipeline.

[0026] The storage chamber 103 in the first-stage circulation mechanism 2 is located at the bottom of the recovery tower 1. An air inlet 101 is provided on one side of the bottom of the recovery tower 1 and is connected to the storage chamber 103 of the first-stage circulation recovery mechanism 2 through the air inlet 101. The storage chambers of the second-stage circulation mechanism 3, the third-stage circulation mechanism 4, and the fourth-stage circulation mechanism 5 are independently located outside the recovery tower 1. Each of the second-stage circulation mechanism 3, the third-stage circulation mechanism 4, and the fourth-stage circulation mechanism 5 is provided with a liquid collection component. The liquid collection component is located below the adsorption component of its respective circulation recovery mechanism and is connected to the storage chamber pipeline of its respective circulation recovery mechanism.

[0027] The spray assembly includes a spray pipe 6, spray heads 7, and a circulation pump. One end of the spray pipe 6 is connected to the circulation pump, and the other end of the spray pipe 6 extends into the recovery tower 1 and is sealed. There are several spray heads 7, all of which are located inside the recovery tower 1 and are equally spaced along the length of the spray pipe 6. The spray heads 7 are connected to the side wall of the spray pipe 6. The other end of the circulation pump is connected to the storage chamber of the circulation mechanism.

[0028] The adsorption assembly includes a filter base plate 8 and an adsorbent material 9. The filter base plate 8 is fixedly connected to the inner wall of the recovery tower 1 and is located below the spray head 7. The adsorbent material 9 is placed on the recovery tower 1 to form a packing layer. The filter base plate 8 is evenly arranged with clearance holes 801 to allow gas to pass through.

[0029] The liquid collection assembly includes an annular liquid collector 10, a support frame 11, and a shielding component 12. The annular liquid collector 10 is disposed below the filter base plate 8. The outer periphery of the annular liquid collector 10 is fixedly connected to the inner wall of the recovery tower 1 and forms a liquid collection channel 13 along the inner periphery of the recovery tower 1. The liquid collection channel 13 is connected to the storage chamber pipeline of the corresponding circulation mechanism. The upper end of the annular liquid collector 10 is fixedly connected to the shielding component 12 through the support frame 11. The support frame 11 is provided with a gap for gas to pass through. The shielding component 12 is arranged in an umbrella shape, and the bottom edge of the shielding component 12 is located above the liquid collection channel 13.

[0030] In the second, third, and fourth circulation mechanisms, the spray water flows down from the avoidance holes in the filter base plate after passing through the adsorbent material. After falling onto the shielding component, it flows along the top arc surface of the shielding component into the liquid collection channel, and then flows through the pipe into the storage chamber of the corresponding circulation mechanism, realizing the recycling of spray water in each circulation mechanism.

[0031] The tetrahydrofuran purification system also includes a connecting component; the connecting component includes a primary connecting pipe, a secondary connecting pipe, a tertiary connecting pipe, and a wastewater discharge pipe; the two ends of the primary connecting pipe are respectively connected to the storage cavities of the first-stage circulation mechanism 2 and the second-stage circulation mechanism 3; the two ends of the secondary connecting pipe are respectively connected to the storage cavities of the second-stage circulation mechanism 3 and the third-stage circulation mechanism 4; the tertiary connecting pipe is respectively connected to the storage cavities of the third-stage circulation mechanism 4 and the fourth-stage circulation mechanism 5; each of the primary, secondary, and tertiary connecting pipes is equipped with a liquid guiding pump; the two ends of the wastewater discharge pipe are respectively connected to the storage cavity of the first-stage circulation mechanism 2 and the wastewater collection cylinder, and discharge the wastewater accumulated in the storage cavity of the first-stage circulation mechanism 2 into the wastewater collection cylinder.

[0032] When the tetrahydrofuran content in the water reaches a certain standard in the storage chamber of the first-stage circulation mechanism, it will be discharged through the wastewater discharge pipe. Then, the water in the storage chamber of the second-stage circulation mechanism is added to the storage chamber of the first-stage circulation mechanism. Next, the water in the storage chamber of the third-stage circulation mechanism is added to the storage chamber of the second-stage circulation mechanism, and the water in the storage chamber of the fourth-stage circulation mechanism is added to the storage chamber of the third-stage circulation mechanism, thus realizing the recycling of water containing tetrahydrofuran.

[0033] The tetrahydrofuran purification system also includes an air intake assembly; the air intake assembly includes an air intake liquid seal tank and an exhaust gas pipeline. The air intake liquid seal tank is a sealed cavity and contains tap water. One end of the exhaust gas pipeline is connected to the exhaust gas generating equipment, and the other end of the exhaust gas pipeline extends into the air intake liquid seal tank and into the tap water. An air outlet is provided at the top of the air intake liquid seal tank, and the air outlet is connected to the air inlet 101 pipeline located at the bottom of the recovery tower 1. A first tap water inlet is provided on one side of the top of the air intake liquid seal tank and is connected to the tap water pipeline through the first tap water inlet.

[0034] The tetrahydrofuran purification system also includes an exhaust component; the exhaust component includes an exhaust liquid seal tank and a purified gas pipeline; the exhaust liquid seal tank is a sealed cavity containing tap water; one end of the purified gas pipeline is connected to the purified gas outlet 102 located at the top of the adsorption tower 1, and the other end of the purified gas pipeline extends into the exhaust liquid seal tank and into the tap water; an exhaust port is provided at the center of the top of the exhaust liquid seal tank, and the exhaust port is connected to the gas-using equipment pipeline; a second tap water inlet is provided on one side of the top of the exhaust liquid seal tank and is connected to the tap water pipeline through the second tap water inlet; a liquid guide port is provided on one side of the middle of the exhaust liquid seal tank, and the liquid guide port is connected to the storage cavity of the fourth-stage circulation mechanism 5 through a four-stage connecting pipeline.

[0035] The intake and exhaust components mainly use water in the liquid seal tank to remove impurities from the gas, thereby improving the gas purification effect. At the same time, the water in the exhaust liquid seal tank can be replenished into the storage chamber of the fourth-stage circulation mechanism through a four-stage connecting pipe, realizing the spray water replenishment operation of the fourth-stage circulation mechanism.

[0036] The tetrahydrofuran purification system also includes a condensation assembly; the condensation assembly includes a first condenser and a second condenser, the first condenser being connected to the spray pipe in the first-stage circulation mechanism 2 and performing a cooling operation on the spray pipe; the second condenser being connected to the spray pipe in the fourth-stage circulation mechanism 5 and performing a cooling operation on the spray pipe; the inlet of the first condenser is connected to the condensate supply equipment pipeline, the outlet of the first condenser is connected to the inlet pipeline of the second condenser, and the outlet of the second condenser is connected to the condensate supply equipment pipeline.

[0037] The condensation unit can cool the spray water in the first-stage and fourth-stage circulation mechanisms to reduce the upward flow velocity of the gas, thereby prolonging the contact time between the gas and the spray water flow and improving the purification effect of the water flow on tetrahydrofuran in the gas.

[0038] Liquid level gauges are installed in the storage cavities of the inlet liquid seal tank, the outlet liquid seal tank, and the first-stage circulation mechanism, the second-stage circulation mechanism, the third-stage circulation mechanism, and the fourth-stage circulation mechanism to monitor the internal liquid level.

[0039] The working principle of this invention is as follows: Gas containing tetrahydrofuran rises after entering the bottom of the recovery tower and enters the packing layer, where it forms a gas-liquid absorption with the water dripping from the first-stage circulation mechanism, completing the initial absorption and further cooling of the tetrahydrofuran. The water accumulated in the storage chamber of the first-stage circulation mechanism is pumped back to the spray pipe by the circulation pump and used as spray water. The primary circulating liquid accumulated in the storage chamber of the first-stage circulation mechanism is a high-concentration circulating liquid, with its concentration generally controlled between 10% and 12%. When the discharge concentration requirement is met, the tetrahydrofuran wastewater is discharged into the tetrahydrofuran wastewater storage tank, while the secondary circulating liquid in the storage chamber of the second-stage circulation mechanism is replenished into the storage chamber of the first-stage circulation mechanism. The gas volume flow rate decreases after cooling, which helps to improve the absorption of tetrahydrofuran by the subsequent packing layer.

[0040] The gas containing tetrahydrofuran continues to rise to the packing layer in the second-stage circulation mechanism. The packing material is of type BX500. The tetrahydrofuran concentration in the secondary circulating liquid in the storage chamber of the second-stage circulation mechanism is generally controlled between 3% and 5%. This packing layer will remove most of the tetrahydrofuran from the gas. The secondary circulating liquid is collected into its respective storage chamber by the liquid collection component. This circulating liquid containing 3% to 5% tetrahydrofuran is added to the storage chamber of the first-stage circulation mechanism in equal amounts after the first-stage circulating liquid is thrown out. At the same time, an equal amount of tertiary circulating liquid is added to the storage chamber of the third-stage circulation mechanism.

[0041] After being absorbed by the packing layer in the second-stage circulation mechanism, the gas continues to rise to the packing layer in the third-stage circulation mechanism. The packing material in this layer is of type BX500. The concentration of tetrahydrofuran in the tertiary circulating liquid in the storage chamber of the third-stage circulation mechanism is generally controlled at 1% to 2%. The tetrahydrofuran remaining in the tetrahydrofuran gas after absorption by the tertiary circulating liquid is basically completely collected. The tertiary circulating liquid is collected into its respective storage chamber by the liquid collection component. The tertiary circulating liquid containing 3% to 5% tetrahydrofuran is added to the storage chamber of the first-stage circulation mechanism and then added to the storage chamber of the second-stage circulation mechanism in equal amounts.

[0042] After being absorbed by the packing layer in the third-stage circulation mechanism, the gas continues to rise to the packing layer in the fourth-stage circulation mechanism. The packing material in this layer is of type BX500. The tetrahydrofuran concentration in the fourth-stage circulating liquid in the storage chamber of the fourth-stage circulation mechanism is generally controlled at 0% to 0.8%. Almost all the tetrahydrofuran remaining in the tetrahydrofuran gas after absorption by the fourth-stage circulating liquid is collected. The fourth-stage circulating liquid, containing 0% to 1% tetrahydrofuran, is then added to the storage chamber of the third-stage circulation mechanism in equal amounts after being added to the storage chamber of the second-stage circulation mechanism by the third-stage circulating liquid. When the wastewater level in the storage chamber of the fourth-stage circulation mechanism is less than 1 meter, the booster pump is automatically activated by a relay, and a certain amount of tap water is added from the gas outlet liquid seal tank.

[0043] In operation, the spray water in the first-stage circulation mechanism enters the packing layer. The gas containing tetrahydrofuran rises after entering the bottom of the recovery tower and passes through the packing layer. The tetrahydrofuran in the gas dissolves in the water and falls into the storage chamber at the bottom of the recovery tower. The water continues to spray through the circulation pump. When the tetrahydrofuran content in the water in the storage chamber reaches a certain level, it is discharged and collected. The gas passing through the packing layer of the first-stage circulation mechanism re-enters the packing layer of the second-stage circulation mechanism. The packing layer of the second-stage circulation mechanism is also wetted by the spray water, allowing the gas to pass through the wetted packing layer again. The water in the packing layer absorbs the tetrahydrofuran in the gas again. This process is repeated, allowing the gas containing tetrahydrofuran to pass through the packing layers of the first, second, third, and fourth-stage circulation mechanisms in sequence before being discharged from the recovery tower. This achieves the tetrahydrofuran purification and recovery effect of the first, second, third, and fourth-stage circulation mechanisms in the gas.

[0044] In this operation, when the gas containing tetrahydrofuran passes through the packing layer wetted by sprayed water, its passage rate is low, which prolongs the contact time between the gas and water and increases the contact area between the tetrahydrofuran and water. This allows the tetrahydrofuran in the gas to dissolve into the water and be collected as much as possible. Furthermore, this invention uses a multi-layer circulation mechanism to recover and purify the tetrahydrofuran in the gas, which can completely remove the tetrahydrofuran from the gas, so that the gas discharged from the recovery tower can meet the emission or reuse standards, and has a better recovery and purification effect. At the same time, compared with the activated carbon adsorption operation in the prior art, the entire recovery and purification process of this technical solution is shorter, which effectively improves the recovery and purification efficiency of tetrahydrofuran and has excellent market promotion prospects.

Claims

1. A tetrahydrofuran purification system, comprising a recovery tower, characterized in that: The recycling tower is equipped with several stages of recycling mechanisms arranged from bottom to top. Each recycling mechanism includes a spray assembly, an adsorption assembly, and a storage chamber. The spray assembly is located above the adsorption assembly, and the storage chamber is located below the adsorption assembly. The storage chamber and the spray assembly are connected by a pipeline. The storage chamber of the first-stage recycling mechanism located at the bottom of the recycling tower is located inside the bottom of the recycling tower. An air inlet is provided at the bottom of the recycling tower and is connected to the storage chamber of the first-stage recycling mechanism. The storage chamber of the recycling mechanism located above the first-stage recycling mechanism is located outside the recycling tower. Each of the recycling mechanisms located above the first-stage recycling mechanism is equipped with a liquid collection component. The liquid collection component is located below the adsorption component of the recycling mechanism and is connected to the storage chamber of the recycling mechanism via a pipeline.

2. The tetrahydrofuran purification system as described in claim 1, characterized in that: The recovery tower is equipped with four-stage circulation and recovery mechanisms arranged from bottom to top: a first-stage circulation mechanism, a second-stage circulation mechanism, a third-stage circulation mechanism, and a fourth-stage circulation mechanism. The storage chamber in the first-stage circulation mechanism is located at the bottom of the recovery tower. The storage chambers of the second-stage, third-stage, and fourth-stage circulation mechanisms are independently located on the outside of the recovery tower. Each of the second-stage, third-stage, and fourth-stage circulation mechanisms is equipped with a liquid collection component, which is connected to the storage chamber of the corresponding circulation mechanism.

3. The tetrahydrofuran purification system as described in claim 2, characterized in that: The spray assembly includes a spray pipe, spray heads, and a circulation pump. One end of the spray pipe is connected to the circulation pump, and the other end of the spray pipe extends into the recovery tower and is sealed. There are several spray heads, all located inside the recovery tower and evenly spaced along the length of the spray pipe. The spray heads are connected to the side wall of the spray pipe. The other end of the circulation pump is connected to the storage chamber of its respective circulation mechanism.

4. The tetrahydrofuran purification system as described in claim 3, characterized in that: The adsorption assembly includes a filter base plate and an adsorbent material. The filter base plate is fixedly connected to the inner wall of the recovery tower and is located below the spray head. The adsorbent material is placed on the recovery tower to form a packing layer. The filter base plate is evenly arranged with clearance holes to allow gas to pass through.

5. The tetrahydrofuran purification system as described in claim 4, characterized in that: The liquid collection assembly includes an annular liquid collection component, a support frame, and a shielding component. The annular liquid collection component is located below the filter base plate. The outer periphery of the annular liquid collection component is fixedly connected to the inner wall of the recovery tower and forms a liquid collection channel along the inner periphery of the recovery tower. The liquid collection channel is connected to the storage chamber pipeline of the corresponding circulation mechanism. A shielding component is fixedly connected to the upper end of the annular liquid collection component through the support frame. The shielding component is arranged in an umbrella shape, and the bottom edge of the shielding component is located above the liquid collection channel.

6. The tetrahydrofuran purification system as described in claim 5, characterized in that: The tetrahydrofuran purification system also includes a connecting component; the connecting component includes a primary connecting pipe, a secondary connecting pipe, a tertiary connecting pipe, and a wastewater discharge pipe; the two ends of the primary connecting pipe are respectively connected to the storage chambers of the first-stage circulation mechanism and the second-stage circulation mechanism; the two ends of the secondary connecting pipe are respectively connected to the storage chambers of the second-stage circulation mechanism and the third-stage circulation mechanism; the tertiary connecting pipe is respectively connected to the storage chambers of the third-stage circulation mechanism and the fourth-stage circulation mechanism; each of the primary, secondary, and tertiary connecting pipes is equipped with a liquid guiding pump; the two ends of the wastewater discharge pipe are respectively connected to the storage chamber of the first-stage circulation mechanism and the wastewater collection cylinder, and discharge the wastewater accumulated in the storage chamber of the first-stage circulation mechanism into the wastewater collection cylinder.

7. The tetrahydrofuran purification system as described in claim 6, characterized in that: The tetrahydrofuran purification system also includes an air intake assembly; the air intake assembly includes an air intake liquid seal tank and an exhaust gas pipeline. The air intake liquid seal tank is a sealed cavity and contains tap water. One end of the exhaust gas pipeline is connected to the exhaust gas generating equipment, and the other end of the exhaust gas pipeline extends into the air intake liquid seal tank and into the tap water. An air outlet is provided at the top of the air intake liquid seal tank, and the air outlet is connected to an air inlet pipeline located at the bottom of the recovery tower. A first tap water inlet is provided on one side of the top of the air intake liquid seal tank and is connected to a tap water pipeline through the first tap water inlet.

8. The tetrahydrofuran purification system as described in claim 7, characterized in that: The tetrahydrofuran purification system also includes an exhaust assembly; the exhaust assembly includes an exhaust liquid seal tank and a purified gas pipeline; the exhaust liquid seal tank is a sealed cavity containing tap water; one end of the purified gas pipeline is connected to the purified gas outlet located at the top of the adsorption tower, and the other end of the purified gas pipeline extends into the exhaust liquid seal tank and into the tap water; an exhaust port is located at the center of the top of the exhaust liquid seal tank, and the exhaust port is connected to the gas-using equipment pipeline; a second tap water inlet is located on one side of the top of the exhaust liquid seal tank and is connected to the tap water pipeline through the second tap water inlet; a liquid guide port is located on one side of the middle of the exhaust liquid seal tank, and the liquid guide port is connected to the storage cavity of the fourth-stage circulation mechanism through a four-stage connecting pipeline.

9. The tetrahydrofuran purification system as described in claim 8, characterized in that: The tetrahydrofuran purification system further includes a condensation assembly; the condensation assembly includes a first condenser and a second condenser, the first condenser being connected to the spray pipe in the first-stage circulation mechanism and performing a cooling operation on the spray pipe; the second condenser being connected to the spray pipe in the fourth-stage circulation mechanism and performing a cooling operation on the spray pipe; the inlet of the first condenser is connected to the condensate supply equipment pipeline, the outlet of the first condenser is connected to the inlet pipeline of the second condenser, and the outlet of the second condenser is connected to the condensate supply equipment pipeline.

10. The tetrahydrofuran purification system as described in claim 9, characterized in that: Liquid level gauges are installed in the storage cavities of the inlet liquid seal tank, the outlet liquid seal tank, and the first-stage circulation mechanism, the second-stage circulation mechanism, the third-stage circulation mechanism, and the fourth-stage circulation mechanism to monitor the internal liquid level.

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