Vacuum drying solvent recovery system

Abstract

The utility model provides a vacuum drying solvent recovery system which comprises a vacuum dryer, a first condenser, a first liquid collector, a gas-liquid separator, an oilless vacuum pump, a second condenser and a VOCs treatment device which are sequentially connected through stainless steel pipes, the bottom of the second condenser is connected with a second liquid collector through a pipeline, and an exhaust pipe is arranged on the VOCs treatment device. Compared with the prior art, the fine chemical product vacuum drying device has the advantages that organic solvent recovery is achieved in the fine chemical product vacuum drying process through the designed parts, the gas-liquid separator is arranged, the condensing pressure of the second condenser is reduced, the vacuum pump can be protected, and finally the VOCs treatment device is arranged in a matched mode, and it is guaranteed that waste gas reaches the standard to be discharged.

Description

Technical Field

[0001] This invention relates to a vacuum drying solvent recovery system, belonging to the field of vacuum drying. Background Technology

[0002] In the production of fine chemical products, organic solvents are almost always used, and the products we need are often solids. This necessitates filtration and drying processes, with vacuum drying being widely used due to its low energy consumption and high drying efficiency. If the organic vapors generated during drying are not properly recovered, it will not only increase production costs for enterprises but also cause environmental pollution when released into the environment. Solvent recovery from vacuum drying not only has economic benefits but also significant environmental implications.

[0003] Patent CN202297161U discloses a solvent recovery vacuum drying system, but it does not consider the treatment of solvents contained in the air after the vacuum pump, nor does it consider the gas-liquid separation problem. In actual use, this will result in a certain amount of solvent being emitted into the atmosphere. Similarly, patent CN208626643U discloses a vacuum drying and recovery system, which also does not consider the above problems. Patent CN214862318U discloses a solvent recovery system for vacuum drying of active pharmaceutical ingredients. Although it filters the gas, it mainly considers the separation of solid powders, which is a common process in current double-cone vacuum drying. Although this system adds a two-stage stainless steel tube condenser, it does not consider the gas-liquid separation problem. Although the water jet vacuum pump used can absorb some water-soluble solvents, its absorption effect on insoluble solvents is poor, and it cannot completely handle the organic solvents in the exhaust gas, and it increases the pressure of water treatment.

[0004] Therefore, this application provides a vacuum drying solvent recovery system suitable for vacuum drying processes, which has both economic benefits and environmental protection effects. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a vacuum drying solvent recovery system.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] A vacuum drying solvent recovery system includes a vacuum dryer, a first condenser, a first liquid collector, a gas-liquid separator, an oil-free vacuum pump, a second condenser, and a VOCs treatment device, which are connected in sequence by stainless steel pipes. The bottom of the second condenser is connected to the second liquid collector through a pipe, and the VOCs treatment device is equipped with an exhaust pipe.

[0008] Furthermore, the first liquid collector has multiple interfaces, and these interfaces are connected to multiple vacuum dryers via the stainless steel tube.

[0009] Furthermore, a shut-off valve and a check valve are provided on the stainless steel pipe connecting the vacuum dryer and the first condenser.

[0010] Furthermore, the oil-free vacuum pump is a vertical oil-free vacuum pump body, the cooling medium of the second condenser is chilled brine, and the inlet and outlet of the oil-free vacuum pump are made of stainless steel hoses.

[0011] Furthermore, both the first and second condensers are stainless steel tube condensers, with circulating water as the cooling medium and an inlet temperature of 20°C.

[0012] Furthermore, the first liquid collector is a stainless steel storage tank with a volume of 100L, and the second liquid collector is a stainless steel storage tank with a volume of 30L.

[0013] Furthermore, the VOCs treatment device includes a treatment box, inside which an activated carbon adsorbent is inserted. The activated carbon adsorbent includes a mounting plate, and multiple mounting components are fixedly provided at the bottom of the mounting plate. Each mounting component includes two clamping frames, and an activated carbon filter screen is inserted between the clamping frames.

[0014] Furthermore, a U-shaped fastener is inserted into the inner side of the clamping frame, and the U-shaped fastener and the clamping frame are provided with corresponding threaded holes. A square-shaped sealing gasket is fixed at the bottom of the mounting plate.

[0015] Furthermore, the gas-liquid separator has an integrally formed square tube on the stainless steel tube facing the first liquid collector. A filter assembly is inserted inside the square tube. The filter assembly includes a double-layer vertical filter frame. Each vertical filter frame has a filter screen one on its inner side. An integral cross frame is fixed between the vertical filter frames. A filter screen two is provided on the inner side of the cross frame. A secondary mounting plate is fixed at the top of the vertical filter frames. The secondary mounting plate is fixed to the bottom of the square tube with screws. A secondary vertical filter frame is fixed in the middle of the cross frame. A filter screen three is provided on the inner side of the secondary vertical filter frame. Side baffles are installed on both sides of the vertical filter frame.

[0016] The beneficial effects of this utility model are:

[0017] The designed components enable the recovery of organic solvents during the vacuum drying process of fine chemical products. The gas-liquid separator reduces the condensation pressure of the second condenser and also protects the vacuum pump. Finally, the VOCs treatment device ensures that the exhaust gas meets emission standards. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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.

[0019] Figure 1 This is a front view of a vacuum drying solvent recovery system according to the present invention;

[0020] Figure 2 This is a schematic diagram of a VOCs treatment device in a vacuum drying solvent recovery system according to this utility model;

[0021] Figure 3 This is a schematic diagram of the activated carbon adsorbent element in a vacuum drying solvent recovery system according to this utility model;

[0022] Figure 4 This is a schematic diagram of a sealing gasket for a vacuum drying solvent recovery system according to the present invention;

[0023] Figure 5 This is a schematic diagram showing the position of the square tube in a vacuum drying solvent recovery system according to this utility model;

[0024] Figure 6 This is a schematic diagram of the filter assembly of a vacuum drying solvent recovery system according to the present invention.

[0025] In the diagram: 1. Vacuum dryer; 2. Shut-off valve; 3. Check valve; 4. First condenser; 5. First liquid collector; 6. Gas-liquid separator; 7. Oil-free vacuum pump; 8. Second liquid collector; 9. Second condenser; 10. VOCs treatment device; 11. Exhaust pipe; 12. Treatment box; 13. Mounting plate; 14. Clamping frame; 15. Activated carbon filter screen; 16. U-shaped fastener; 17. Threaded hole; 18. Sealing gasket; 19. Square tube; 20. Vertical filter frame; 21. Cross frame; 22. Secondary mounting plate; 23. Secondary vertical filter frame; 24. Side baffle. Detailed Implementation

[0026] 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, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1This utility model provides a technical solution: a vacuum drying solvent recovery system, including a vacuum dryer 1, a first condenser 4, a first liquid collector 5, a gas-liquid separator 6, an oil-free vacuum pump 7, a second condenser 9, and a VOCs treatment device 10 connected in sequence by stainless steel pipes. The bottom of the second condenser 9 is connected to the second liquid collector 8 through a pipe. The VOCs treatment device 10 is provided with an exhaust pipe 11.

[0028] See Figure 1 The first liquid collector 5 has multiple interfaces, which are connected to multiple vacuum dryers 1 via stainless steel pipes. The stainless steel pipe connecting the vacuum dryer 1 and the first condenser 4 is equipped with a shut-off valve 2 and a check valve 3. The oil-free vacuum pump 7 is a vertical oil-free vacuum pump body. The cooling medium of the second condenser 9 is chilled brine. The inlet and outlet of the oil-free vacuum pump 7 are stainless steel flexible hoses. Both the first condenser 4 and the second condenser 9 are stainless steel tube condensers with circulating water as the cooling medium and an inlet temperature of 20°C. The first liquid collector 5 is a stainless steel storage tank with a volume of 100L, and the second liquid collector 8 is a stainless steel storage tank with a volume of 30L.

[0029] The oil-free vacuum pump 7 is a vertical oil-free vacuum pump body, which produces no wastewater. The cooling medium of the second condenser 9 is chilled brine, which further condenses organic solvents. The gas-liquid separator 6 separates small droplets in the gas, protects the oil-free vacuum pump 7, and reduces the condensation pressure of the second condenser 9. That is to say, there is one first liquid collector 5 and multiple vacuum dryers 1, which are connected by multiple stainless steel pipes. However, there is also a first condenser 4 connected between them. The number of first condensers 4 is designed according to the actual situation to ensure the condensation effect. However, each stainless steel pipe needs to be equipped with a shut-off valve, which is opened or closed according to the actual working conditions.

[0030] See Figure 1-4The VOCs treatment device 10 includes a treatment box 12, inside which an activated carbon adsorbent is inserted. The activated carbon adsorbent includes a mounting plate 13, with multiple mounting components fixed to the bottom of the mounting plate 13. Each mounting component includes two clamping frames 14, with an activated carbon filter 15 inserted between the clamping frames 14. A U-shaped fixing member 16 is also inserted inside the clamping frames 14, with corresponding threaded holes 17 on the U-shaped fixing member 16 and the clamping frames 14. A U-shaped sealing gasket 18 is fixed to the bottom of the mounting plate 13 to hold the activated carbon filter. 15 is inserted into the clamping frame 14, and the activated carbon filter 15 is slightly clamped in the two clamping frames 14. Then, the U-shaped fastener 16 is inserted into the two clamping frames 14. The threaded holes are designed to correspond one by one. The threaded insertion is configured separately to complete the fixing of the U-shaped fastener 16 in the two clamping frames 14. The activated carbon filter 15 can be disassembled and removed for easy replacement. The activated carbon filter 15 is replaced regularly. Before the VOCs treatment device performs the process, there is very little solvent after the secondary condensation. Therefore, as a preferred option, the internal activated carbon mesh is selected as the core adsorption component inside the VOCs treatment device.

[0031] See Figure 5-6 An integrally formed square tube 19 is provided on the stainless steel tube of the gas-liquid separator 6 facing the first liquid collector 5. A filter assembly is inserted into the square tube 19. The filter assembly includes a double-layer vertical filter frame 20. Each vertical filter frame 20 has a filter screen on its inner side. An integral cross frame 21 is fixed between the vertical filter frames 20. A filter screen is provided on the inner side of the cross frame 21. A secondary mounting plate 22 is fixed at the top of the vertical filter frames 20. The secondary mounting plate 22 is fixed to the bottom end of the square tube 19 with screws. A secondary mounting plate is fixed in the middle of the cross frame 21. The vertical filter frame 23 has a filter screen 3 inside. The vertical filter frame 20 has side baffles 24 installed on both sides. Before gas-liquid separation, impurities in the gas and liquid can be filtered to ensure the effect of subsequent process treatment. Filter screen 1, filter screen 2, and filter screen 3 perform layer-by-layer filtration to improve the filtration effect. The side baffles 24 are installed on both sides of the vertical filter frame 20 with screws. The cross frame 21 and the secondary vertical filter frame 23 effectively filter and intercept filter objects. The design of the side baffles 24 effectively accommodates and intercepts filter objects. A U-shaped sealing gasket can also be designed at the bottom of the secondary mounting plate 22.

[0032] In practical operation, the designed components enable the recovery of organic solvents during the vacuum drying process of fine chemical products. The gas-liquid separator reduces the condensation pressure of the second condenser and also protects the vacuum pump. Finally, the VOCs treatment device ensures that the exhaust gas meets emission standards.

[0033] The stainless steel pipes in this application are connected to various design components using flanges. Vacuum dryer 1 is a double-cone vacuum dryer with a volume of 2000L. The first condenser 4 is a stainless steel tube condenser with solvent vapor flowing through the tubes and circulating water as the cooling medium, with an inlet temperature of 20℃. The second condenser 9 is a stainless steel tube condenser with solvent vapor flowing through the tubes and chilled brine as the cooling medium, with an inlet temperature of -5℃. The first liquid collector 5 is a stainless steel storage tank with a volume of 100L. The second liquid collector 8 is a stainless steel storage tank with a volume of 30L. The first condenser 4 and the second condenser 9 are designed to be vertical or horizontal depending on the actual space and the type of condenser is selected according to the actual situation. The stainless steel pipes in this application are equipped with the necessary valves when required.

[0034] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A vacuum drying solvent recovery system characterized by: It includes vacuum dryer (1), first condenser (4), first liquid collector (5), gas-liquid separator (6), oil-free vacuum pump (7), second condenser (9) and VOCs processing device (10) connected in turn through stainless steel pipes, the bottom of the second condenser (9) is connected with the second liquid collector (8) through pipeline, and the VOCs processing device (10) is provided with an exhaust pipe (11).

2. A vacuum drying solvent recovery system according to claim 1, wherein: The first liquid collector (5) has a plurality of interfaces, and the interfaces are connected with a plurality of vacuum dryers (1) through stainless steel pipes.

3. A vacuum drying solvent recovery system according to claim 2, wherein: The stainless steel pipe connected between the vacuum dryer (1) and the first condenser (4) is provided with a shut-off valve (2) and a check valve (3).

4. A vacuum drying solvent recovery system according to claim 3, wherein: The oil-free vacuum pump (7) is a vertical oil-free vacuum pump body, the cooling medium of the second condenser (9) is frozen brine, and the inlet and outlet of the oil-free vacuum pump (7) adopt stainless steel hoses.

5. A vacuum drying solvent recovery system according to claim 4, wherein: The first condenser (4) and the second condenser (9) both adopt stainless steel tube condensers, and the cooling medium is circulating water with an inlet temperature of 20 DEG C.

6. A vacuum drying solvent recovery system according to claim 5, wherein: The first liquid collector (5) adopts a stainless steel storage tank with a volume of 100L, and the second liquid collector (8) also adopts a stainless steel storage tank with a volume of 30L.

7. A vacuum drying solvent recovery system according to claim 6, wherein: The VOCs processing device (10) includes a processing box (12), an activated carbon adsorption assembly is inserted into the processing box (12), the activated carbon adsorption assembly includes a mounting plate (13), a plurality of mounting pieces are fixedly arranged at the bottom end of the mounting plate (13), each mounting piece includes two clamping frame (14), and activated carbon filter screens (15) are inserted between the clamping frames (14).

8. A vacuum drying solvent recovery system according to claim 7, wherein: A U-shaped fixing piece (16) is also inserted into the inner side of the clamping frame (14), threaded holes (17) are formed in the U-shaped fixing piece (16) and the clamping frame (14) in a corresponding mode, and a square sealing gasket (18) is fixedly arranged at the bottom end of the mounting plate (13).

9. A vacuum drying solvent recovery system according to claim 8, wherein: A square pipe (19) is integrally formed on the stainless steel pipe towards the first liquid collector (5), a filter assembly is inserted into the square pipe (19), the filter assembly includes double-layer vertical filter frames (20), filter screens one are arranged on the inner sides of the vertical filter frames (20), an integrated cross frame (21) is fixedly arranged between the vertical filter frames (20), filter screens two are arranged on the inner side of the cross frame (21), a vice mounting plate (22) is fixedly arranged at the top end of the vertical filter frames (20), the vice mounting plate (22) is fixed in the bottom end of the square pipe (19) in a screwing mode, a vice vertical filter frame (23) is fixedly arranged in the middle of the cross frame (21), filter screens three are arranged on the inner side of the vice vertical filter frame (23), and side baffles (24) are arranged on both sides of the vertical filter frames (20).

Images