Purification device and purification method of isopropanol waste liquid

Abstract

The invention relates to the related technical field of purification devices, in particular to an isopropanol waste liquid purification device and a purification method thereof.The isopropanol waste liquid purification device comprises an evaporation tank, an upper cover, a heater, a first-stage condensation structure and a second-stage condensation structure, supporting legs are arranged at the bottom of the evaporation tank, and a liquid inlet and a liquid outlet are formed in the side wall of the evaporation tank; stop valves are arranged at the liquid inlet and the liquid outlet; the adding liquid level of the isopropanol waste liquid in the evaporation tank is lower than the height of the liquid inlet; isopropyl alcohol and isopropyl acetate in the isopropyl alcohol waste liquid are evaporated into gas through the heater, and when the gas-state isopropyl alcohol and isopropyl acetate flow to the first-stage condensation structure and the second-stage condensation structure, the gas-state isopropyl acetate can be liquefied on the condensation rod, so that the gas-state isopropyl acetate flows into the liquid collection cavity along the condensation rod; according to the isopropyl acetate separation device, isopropyl acetate and isopropyl acetate are separated, and nitrogen is used as a heat exchange medium, so that the heat exchange precision is effectively improved, and the purity of isopropyl alcohol is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of purification devices, and specifically to a purification device and a purification method for isopropanol waste liquid. Background Technique

[0002] Isopropanol is a colorless liquid, well-known for its high volatility and relatively low boiling point (about 82.6 °C). Its melting point is -89.5 °C. Isopropanol is completely miscible in most solvents such as water, ethanol, and chloroform, and can dissolve a variety of non-polar compounds, showing its characteristics as a versatile solvent. In addition, it is a flammable substance and releases water and acetone when reacting with oxidants; isopropanol is widely used in fields such as chemical industry, solvents, medicine, pesticides, electronic cleaning, oil extraction, and chromatographic analysis;

[0003] The existing Chinese patent document with the publication number CN118384515B discloses a purification device and method for isopropanol. The scheme includes an isopropanol dehydration tower, a dehydration tank, a heat exchange tank, a condenser, and a vacuum pump. The side wall of the heat exchange tank is provided with a water inlet, and a water delivery structure is arranged between the heat exchange tank and the isopropanol dehydration tower. The isopropanol dehydration tower and the dehydration tank are connected through a drainage pipe. A heat exchange spiral pipe is penetrated between the top and bottom of the heat exchange tank, and the heat exchange spiral pipe is used to connect the dehydration tank and the condenser. The vacuum pump is connected to the condenser; two partitions are arranged between the opposite sides of the dehydration tank, and a bearing plate is slidably installed between the opposite sides of the dehydration tank. The two partitions divide the internal space of the dehydration tank into three cavities. The lengths of the two outer cavities are greater than the length of the middle cavity. The length of the bearing plate is greater than the sum of the lengths of the middle cavity and one outer cavity. The partition is arranged in two sections, and the two sections of the partition slide and fit on the top and bottom of the bearing plate. Permeation vaporization membranes are installed in the two placement grooves of the bearing plate. Two scrubbing components for cleaning the permeation vaporization membranes are arranged in the dehydration tank. The two scrubbing components are respectively located in the two outer cavities, and a driving mechanism for driving the bearing plate to slide is arranged in the dehydration tank.

[0004] However, in the above scheme, a permeation vaporization membrane is used as the separation structure. However, this membrane only has a good separation effect on the separation of water and isopropanol. Usually, a certain amount of isopropyl acetate is also contained in the isopropanol waste liquid. In this case, using the permeation vaporization membrane for separation will result in a poor overall separation and purification effect of the device. Therefore, the present invention proposes a purification device and a purification method for isopropanol waste liquid to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a purification device and a purification method for isopropanol waste liquid to solve the problems raised in the above background technique.

[0006] To achieve the above object, the present invention provides the following technical solution: A purification device for isopropanol waste liquid, comprising:

[0007] An evaporation tank, a support leg is provided at the bottom of the evaporation tank, and a liquid inlet and a liquid outlet are provided on the side wall of the evaporation tank. Stop valves are provided at both the liquid inlet and the liquid outlet, and the liquid addition level of the isopropanol waste liquid in the evaporation tank is lower than the height of the liquid inlet.

[0008] An upper cover, which is installed at the tank opening position of the evaporation tank. An exhaust port is provided on the upper cover, and the exhaust port is connected to a condenser through a first-stage pipeline. The liquid outlet end of the condenser is connected to an isopropanol collection tank.

[0009] A heater, which is installed at the bottom position of the evaporation tank. The heating temperature of the heater is higher than the boiling point of isopropyl acetate and lower than the boiling point of water.

[0010] A first-stage condensation structure, which is installed in the inner cavity of the evaporation tank.

[0011] A second-stage condensation structure, which is installed in the inner cavity of the evaporation tank, and the second-stage condensation structure is located directly above the first-stage condensation structure.

[0012] Preferably, the first-stage condensation structure is a ring-shaped disc structure, and a liquid collection cavity, a heat exchange cavity and a condensation cavity are provided on the first-stage condensation structure. The heat exchange cavity and the condensation cavity are not connected. The liquid collection cavity and the condensation cavity are connected through a connection hole. The end of the connection hole facing the condensation cavity is inclined upward, and a condensation rod is provided in the connection hole. The end of the condensation rod extends into the condensation cavity.

[0013] Preferably, a liquid outlet is provided on the side wall of the liquid collection cavity, an air inlet and an air outlet are provided on the side wall of the heat exchange cavity. Thread grooves are provided at the outer ports of the liquid outlet, the air inlet and the air outlet, and a first-stage liquid discharge pipe, a first-stage air inlet pipe and a first-stage exhaust pipe are respectively threadedly connected in the liquid outlet, the air inlet and the air outlet.

[0014] Preferably, the secondary condensation structure has the same structure as the primary condensation structure, and a secondary drain pipe, a secondary inlet pipe, and a secondary exhaust pipe are respectively connected to the drain port, the inlet port, and the exhaust port of the secondary condensation structure. The primary drain pipe and the secondary drain pipe are both connected to an isopropyl acetate collection tank. The primary inlet pipe and the secondary inlet pipe are both connected to the outlet end of a gas cooler. The primary exhaust pipe and the secondary exhaust pipe are both connected to the return air end of the gas cooler. The gas circulated by the gas cooler is nitrogen, and the temperature of the gas delivered from the outlet end of the gas cooler is higher than the boiling point of isopropanol and lower than the boiling point of isopropyl acetate. A primary connecting ear plate is integrally formed on the upper side of the primary condensation structure, and a secondary connecting ear plate is integrally formed on the upper side of the secondary condensation structure. The primary connecting ear plate and the secondary connecting ear plate are both fixed to the inner side wall of the evaporation tank by positioning bolts.

[0015] Preferably, condensation needles are provided on the side wall of the condensation rod. The end of the condensation needle is higher than the root of the condensation needle, and multiple condensation needles are provided on a single condensation rod. The condensation rod, the condensation needles, the primary condensation structure, and the secondary condensation structure are all cast from a heat-conducting metal, and heat-insulating and heat-preserving layers are provided on the lower surfaces of the primary condensation structure and the secondary condensation structure. A plug-in block is integrally formed at the root of the condensation rod, and a plug-in hole is provided on the side wall of the connection hole. When the condensation rod is actually installed, the plug-in block is plugged into the plug-in hole.

[0016] Preferably, a rotating hole is provided at the bottom of the evaporation tank, and a primary sealing bearing is fixedly installed in the rotating hole. A bearing mounting frame is fixedly connected to the side wall of the evaporation tank, and a secondary sealing bearing is fixedly installed on the bearing mounting frame. A rotating shaft is installed on the primary sealing bearing and the secondary sealing bearing. A stirring rod is fixedly connected to the side wall of the rotating shaft, and the bottom of the rotating shaft is driven by a reduction motor.

[0017] Preferably, a primary through hole is provided at the center of the primary condensation structure, and a secondary through hole is provided at the center of the secondary condensation structure. The secondary through hole does not completely penetrate the secondary condensation structure. The rotating shaft passes through the primary through hole, and a primary annular seat and a secondary annular seat are fixedly installed on the rotating shaft. The primary annular seat and the secondary annular seat are respectively arranged in the cavities of the primary through hole and the secondary through hole.

[0018] Preferably, impact plates are integrally formed on the side walls of the primary annular seat and the secondary annular seat, and impact rods are integrally formed on the side walls of the primary through hole and the secondary through hole. The impact rods are hard metal rods, and the impact plates are metal sheet structures cast from spring steel. When the rotating shaft rotates, the impact rods will interfere with the impact plates.

[0019] Preferably, an exhaust fan blade is fixedly installed at the position on the rotating shaft between the primary condensation structure and the secondary condensation structure. When the reduction motor is driving, the airflow generated by the operation of the exhaust fan blade moves from top to bottom, and the overall flow direction of the gas in the evaporation tank is from bottom to top.

[0020] A purification method for isopropyl alcohol waste liquid is realized through the above-mentioned purification device for isopropyl alcohol waste liquid. The purification method is as follows: The to-be-treated isopropyl alcohol waste liquid is transported through the liquid inlet to the inner cavity of the evaporation tank, and then the isopropyl alcohol and isopropyl acetate in the isopropyl alcohol waste liquid are evaporated by the heater. When the gaseous isopropyl alcohol and isopropyl acetate pass through the primary condensation structure and the secondary condensation structure, the gaseous isopropyl acetate will condense into liquid droplets on the condensation rod, and then flow down along the condensation rod into the liquid collection cavity, and finally flow through the liquid discharge port into the isopropyl acetate collection tank. The gaseous isopropyl alcohol will pass through the condensation cavity, flow out from the exhaust port, and be condensed by the condenser, and finally flow into the isopropyl alcohol collection tank for collection.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. By providing a purification device for isopropyl alcohol waste liquid composed of an evaporation tank, an upper cover, a heater, a primary condensation structure and a secondary condensation structure, the isopropyl alcohol and isopropyl acetate in the isopropyl alcohol waste liquid are evaporated into gas by the heater. When the gaseous isopropyl alcohol and isopropyl acetate flow to the primary condensation structure and the secondary condensation structure, the gaseous isopropyl acetate will liquefy on the condensation rod, and then flow down along the condensation rod into the liquid collection cavity, thereby realizing the separation of isopropyl alcohol and isopropyl acetate. And by using nitrogen as the heat exchange medium, the accuracy of heat exchange is effectively improved, thereby effectively improving the purification degree of isopropyl alcohol.

[0023] 2. By providing condensation needles on the side wall of the condensation rod, the heat exchange area is effectively increased, thereby effectively improving the heat exchange efficiency and effectively improving the condensation efficiency of isopropyl acetate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is a half-sectional view of the present invention;

[0026] Figure 3 is Figure 2 an enlarged schematic view of the structure at A in

[0027] Figure 4 is Figure 2 an enlarged schematic view of the structure at B in

[0028] Figure 5 is Figure 2 Enlarged schematic diagram of the structure at position C in

[0029] Figure 6 is Figure 5 Enlarged schematic diagram of the structure at position D in

[0030] Figure 7 Schematic diagram of the primary condensation structure of the present invention;

[0031] Figure 8 is Figure 7 Enlarged schematic diagram of the structure at position E in

[0032] Figure 9 Schematic diagram of the secondary condensation structure of the present invention;

[0033] Figure 10 Schematic diagram of the position distribution of the condensation needles of the present invention.

[0034] In the figure: evaporation tank 1, upper cover 2, heater 3, primary condensation structure 4, secondary condensation structure 5, support leg 6, liquid inlet 7, liquid outlet 8, bearing mounting bracket 9, primary sealed bearing 10, secondary sealed bearing 11, rotating shaft 12, stirring rod 13, exhaust port 14, liquid collection chamber 15, heat exchange chamber 16, condensation chamber 17, connection hole 18, condensation rod 19, insertion hole 20, insertion block 21, condensation needle 22, primary drain pipe 23, primary inlet pipe 24, primary exhaust pipe 25, secondary drain pipe 26, secondary inlet pipe 27, secondary exhaust pipe 28, primary connecting ear plate 29, secondary connecting ear plate 30, primary through hole 31, secondary through hole 32, impact rod 33, primary annular seat 34, secondary annular seat 35, impact plate 36, exhaust fan blade 40. Detailed implementation manners

[0035] In order to clearly and completely describe the objectives, technical solutions of the present invention and make the advantages more clearly understood, the following further elaborates on the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0036] Please refer to Figures 1 - 10 , the present invention provides embodiments of the following four preferred solutions:

[0037] Example 1. A purification device for isopropanol waste liquid includes an evaporation tank 1, an upper cover 2, a heater 3, a primary condensation structure 4 and a secondary condensation structure 5. Support legs 6 are provided at the bottom of the evaporation tank 1, and a liquid inlet 7 and a liquid outlet 8 are provided on the side wall of the evaporation tank 1. Cut-off valves are provided at both the liquid inlet 7 and the liquid outlet 8. The addition liquid level of the isopropanol waste liquid in the evaporation tank 1 is lower than the height of the liquid inlet 7. The upper cover 2 is installed at the tank opening position of the evaporation tank 1. An exhaust port 14 is provided on the upper cover 2. The exhaust port 14 is connected to a condenser through a primary pipeline, and the liquid outlet end of the condenser is connected to an isopropanol collection tank. The heater 3 is installed at the bottom position of the evaporation tank 1. The heating temperature of the heater 3 is higher than the boiling point of isopropyl acetate and lower than the boiling point of water. The primary condensation structure 4 is installed in the inner cavity of the evaporation tank 1, and the secondary condensation structure 5 is installed in the inner cavity of the evaporation tank 1, and the secondary condensation structure 5 is located directly above the primary condensation structure 4.

[0038] The primary condensation structure 4 is a ring-shaped disc structure, and a liquid collection cavity 15, a heat exchange cavity 16 and a condensation cavity 17 are provided on the primary condensation structure 4. The heat exchange cavity 16 and the condensation cavity 17 are not connected. The liquid collection cavity 15 and the condensation cavity 17 are connected through a connection hole 18. The end of the connection hole 18 facing the condensation cavity 17 is inclined upward, and a condensation rod 19 is provided in the connection hole 18. The end of the condensation rod 19 extends into the condensation cavity 17.

[0039] A liquid outlet is provided on the side wall of the liquid collection cavity 15, an air inlet and an air outlet are provided on the side wall of the heat exchange cavity 16. Thread grooves are provided at the outer ports of the liquid outlet, the air inlet and the air outlet, and a primary liquid discharge pipe 23, a primary air inlet pipe 24 and a primary exhaust pipe 25 are respectively threadedly connected in the liquid outlet, the air inlet and the air outlet.

[0040] The structure of the secondary condensation structure 5 is the same as that of the primary condensation structure 4. A secondary drain pipe 26, a secondary inlet pipe 27, and a secondary exhaust pipe 28 are respectively connected to the drain port, the inlet port, and the exhaust port of the secondary condensation structure 5. Both the primary drain pipe 23 and the secondary drain pipe 26 are connected to the isopropyl acetate collection tank. Both the primary inlet pipe 24 and the secondary inlet pipe 27 are connected to the outlet end of the gas cooler. Both the primary exhaust pipe 25 and the secondary exhaust pipe 28 are connected to the return air end of the gas cooler. The gas circulated by the gas cooler is nitrogen, and the temperature of the gas delivered from the outlet end of the gas cooler is higher than the boiling point of isopropanol and lower than the boiling point of isopropyl acetate. By providing a purification device for isopropanol waste liquid composed of an evaporation tank 1, an upper cover 2, a heater 3, a primary condensation structure 4, and a secondary condensation structure 5, the isopropanol and isopropyl acetate in the isopropanol waste liquid are evaporated into a gaseous state by the heater 3. When the gaseous isopropanol and isopropyl acetate flow towards the primary condensation structure 4 and the secondary condensation structure 5, the gaseous isopropyl acetate will liquefy on the condensation rod 19 and then flow down along the condensation rod 19 into the liquid collection chamber 15, thus realizing the separation of isopropanol and isopropyl acetate. Moreover, by using nitrogen as the heat exchange medium, the accuracy of heat exchange is effectively improved, thereby effectively improving the purification degree of isopropanol.

[0041] A primary connecting ear plate 29 is integrally formed on the upper side of the primary condensation structure 4, and a secondary connecting ear plate 30 is integrally formed on the upper side of the secondary condensation structure 5. Both the primary connecting ear plate 29 and the secondary connecting ear plate 30 are fixed to the inner side wall of the evaporation tank 1 by positioning bolts, which facilitates the disassembly and assembly of the primary condensation structure 4 and the secondary condensation structure 5.

[0042] Embodiment 2: On the basis of Embodiment 1, condensation needles 22 are provided on the side wall of the condensation rod 19. The end of the condensation needle 22 is higher than the root of the condensation needle 22, and multiple condensation needles 22 are provided on a single condensation rod 19. By providing the condensation needles 22 on the side wall of the condensation rod 19, the heat exchange area is effectively increased, the heat exchange efficiency is effectively improved, and the condensation efficiency of isopropyl acetate is effectively improved. The condensation rod 19, the condensation needles 22, the primary condensation structure 4, and the secondary condensation structure 5 are all cast from heat-conducting metal, and heat-insulating and heat-preserving layers are provided on the lower surfaces of the primary condensation structure 4 and the secondary condensation structure 5. A plug-in block 21 is integrally formed at the root of the condensation rod 19, and a plug-in hole 20 is provided on the side wall of the connection hole 18. When the condensation rod 19 is actually installed, the plug-in block 21 is plugged into the plug-in hole 20, which facilitates the assembly of the condensation rod 19.

[0043] Embodiment 3. On the basis of Embodiment 2, a rotating hole is opened at the bottom of the evaporation tank 1, and a first-stage sealed bearing 10 is fixedly installed in the rotating hole. A bearing mounting frame 9 is fixedly connected to the side wall of the evaporation tank 1, and a second-stage sealed bearing 11 is fixedly installed on the bearing mounting frame 9. A rotating shaft 12 is installed on the first-stage sealed bearing 10 and the second-stage sealed bearing 11. A stirring rod 13 is fixedly connected to the side wall of the rotating shaft 12. The bottom of the rotating shaft 12 is driven by a reduction motor. Through the stirring action of the stirring rod 13, the volatilization efficiency of isopropanol and isopropyl acetate is improved.

[0044] A first-stage through hole 31 is opened at the center position of the first-stage condensation structure 4, and a second-stage through hole 32 is opened at the center position of the second-stage condensation structure 5. The second-stage through hole 32 does not completely penetrate the second-stage condensation structure 5. The rotating shaft 12 is arranged through the first-stage through hole 31. A first-stage annular seat 34 and a second-stage annular seat 35 are fixedly installed on the rotating shaft 12. The first-stage annular seat 34 and the second-stage annular seat 35 are respectively arranged in the cavities of the first-stage through hole 31 and the second-stage through hole 32.

[0045] Impact plates 36 are integrally formed on the side walls of the first-stage annular seat 34 and the second-stage annular seat 35, and impact rods 33 are integrally formed on the side walls of the first-stage through hole 31 and the second-stage through hole 32. The impact rods 33 are hard metal rods, and the impact plates 36 are metal sheet structures cast from spring steel. When the rotating shaft 12 rotates, the impact rods 33 will interfere with the impact plates 36. Mechanical vibration is formed through the impact between the impact plates 36 and the impact rods 33, so that the droplets on the condensation rods 19 and the condensation needles 22 can flow down faster.

[0046] An exhaust fan blade 40 is fixedly installed at the position between the first-stage condensation structure 4 and the second-stage condensation structure 5 on the rotating shaft 12. When the reduction motor is driving, the airflow generated by the operation of the exhaust fan blade 40 moves from top to bottom, and the overall flow direction of the gas in the evaporation tank 1 is from bottom to top. An airflow from bottom to top is formed through the exhaust fan blade 40, and it is ensured that the overall flow direction of the gas in the evaporation tank 1 is from bottom to top, thereby slowing down the rising rate of the gas, enabling the gas to exchange heat more fully, ensuring that the isopropyl acetate in the gas can be fully liquefied, and effectively ensuring the purity of the final isopropanol.

[0047] Example 4. On the basis of Example 3, a purification method for isopropyl alcohol waste liquid is realized by the above-mentioned purification device for isopropyl alcohol waste liquid. The purification method is as follows: the to-be-treated isopropyl alcohol waste liquid is transported into the inner cavity of the evaporation tank 1 through the liquid inlet 7, and then the isopropyl alcohol and isopropyl acetate in the isopropyl alcohol waste liquid are evaporated by the heater 3. When the gaseous isopropyl alcohol and isopropyl acetate pass through the primary condensation structure 4 and the secondary condensation structure 5, the gaseous isopropyl acetate will condense into droplets on the condensation rod 19, then flow down along the condensation rod 19 into the liquid collection cavity 15, and finally flow through the liquid discharge port into the isopropyl acetate collection tank. The gaseous isopropyl alcohol will pass through the condensation cavity 17, flow out from the exhaust port 14, and be condensed by the condenser, and finally flow into the isopropyl alcohol collection tank for collection.

[0048] Although the above description of the illustrative specific embodiments of the present application is provided for those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments. For those ordinary skilled in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all application creations using the concept of the present application are within the scope of protection.

Claims

1. A purification device for isopropanol waste liquid, characterized in that: Comprising: An evaporation tank (1), with support legs (6) provided at the bottom of the evaporation tank (1), and a liquid inlet (7) and a liquid outlet (8) provided on the side wall of the evaporation tank (1). Cut-off valves are provided at both the liquid inlet (7) and the liquid outlet (8). The addition liquid level of the isopropyl alcohol waste liquid in the evaporation tank (1) is lower than the height of the liquid inlet (7). An upper cover (2), which is installed at the tank opening position of the evaporation tank (1). An exhaust port (14) is provided on the upper cover (2). The exhaust port (14) is connected to a condenser through a primary pipeline, and the liquid outlet end of the condenser is connected to an isopropyl alcohol collection tank. A heater (3), which is installed at the bottom position of the evaporation tank (1). The heating temperature of the heater (3) is higher than the boiling point of isopropyl acetate and lower than the boiling point of water. A primary condensation structure (4), which is installed in the inner cavity of the evaporation tank (1). A secondary condensation structure (5), which is installed in the inner cavity of the evaporation tank (1), and the secondary condensation structure (5) is located directly above the primary condensation structure (4).

2. The purification device for isopropanol waste liquid according to claim 1, characterized in that: The primary condensation structure (4) is a ring-shaped disc structure, and a liquid collection chamber (15), a heat exchange chamber (16) and a condensation chamber (17) are provided on the primary condensation structure (4). The heat exchange chamber (16) and the condensation chamber (17) are not connected. The liquid collection chamber (15) and the condensation chamber (17) are connected through a connection hole (18). The end of the connection hole (18) facing the condensation chamber (17) is inclined upward, and a condensation rod (19) is provided in the connection hole (18). The end of the condensation rod (19) extends into the condensation chamber (17).

3. The purification device for isopropanol waste liquid according to claim 2, wherein: A liquid outlet is provided on the side wall of the liquid collection chamber (15). An air inlet and an air outlet are provided on the side wall of the heat exchange chamber (16). Thread grooves are provided at the outer ports of the liquid outlet, the air inlet and the air outlet. A primary liquid discharge pipe (23), a primary air inlet pipe (24) and a primary exhaust pipe (25) are respectively threadedly connected in the liquid outlet, the air inlet and the air outlet.

4. The purification device for isopropanol waste liquid according to claim 3, characterized in that: The secondary condensation structure (5) has the same structure as the primary condensation structure (4). A secondary drain pipe (26), a secondary inlet pipe (27), and a secondary exhaust pipe (28) are respectively connected to the drain port, the inlet port, and the exhaust port of the secondary condensation structure (5). The primary drain pipe (23) and the secondary drain pipe (26) are both connected to the isopropyl acetate collection tank. The primary inlet pipe (24) and the secondary inlet pipe (27) are both connected to the outlet end of the gas cooler. The primary exhaust pipe (25) and the secondary exhaust pipe (28) are both connected to the return air end of the gas cooler. The gas circulated by the gas cooler is nitrogen, and the temperature of the gas delivered from the outlet end of the gas cooler is higher than the boiling point of isopropanol and lower than the boiling point of isopropyl acetate. A primary connection ear plate (29) is integrally formed on the upper side of the primary condensation structure (4), and a secondary connection ear plate (30) is integrally formed on the upper side of the secondary condensation structure (5). The primary connection ear plate (29) and the secondary connection ear plate (30) are both fixed to the inner side wall of the evaporation tank (1) by positioning bolts.

5. The purification device for isopropanol waste liquid according to claim 4, wherein: Condensation needles (22) are provided on the side wall of the condensation rod (19). The end of the condensation needle (22) is higher than the root of the condensation needle (22), and multiple condensation needles (22) are provided on a single condensation rod (19). The condensation rod (19), the condensation needles (22), the primary condensation structure (4), and the secondary condensation structure (5) are all cast from heat-conducting metal, and heat-insulating and heat-preserving layers are provided on the lower surfaces of the primary condensation structure (4) and the secondary condensation structure (5). A plug-in block (21) is integrally formed at the root of the condensation rod (19). Plug-in holes (20) are provided on the side wall of the connection hole (18). When the condensation rod (19) is actually installed, the plug-in block (21) is plugged into the plug-in hole (20).

6. The purification device for isopropanol waste liquid according to claim 5, wherein: A rotating hole is provided at the bottom of the evaporation tank (1), and a primary sealing bearing (10) is fixedly installed in the rotating hole. A bearing mounting bracket (9) is fixedly connected to the side wall of the evaporation tank (1), and a secondary sealing bearing (11) is fixedly installed on the bearing mounting bracket (9). A rotating shaft (12) is installed on the primary sealing bearing (10) and the secondary sealing bearing (11). A stirring rod (13) is fixedly connected to the side wall of the rotating shaft (12), and the bottom of the rotating shaft (12) is driven by a reduction motor.

7. The purification device for isopropanol waste liquid according to claim 6, characterized in that: A primary through hole (31) is provided at the central position of the primary condensation structure (4), and a secondary through hole (32) is provided at the central position of the secondary condensation structure (5). The secondary through hole (32) does not completely penetrate the secondary condensation structure (5). The rotating shaft (12) is arranged to pass through the primary through hole (31). A primary annular seat (34) and a secondary annular seat (35) are fixedly installed on the rotating shaft (12), and the primary annular seat (34) and the secondary annular seat (35) are respectively arranged in the cavities of the primary through hole (31) and the secondary through hole (32).

8. The purification device for isopropanol waste liquid according to claim 7, wherein: An impact plate (36) is integrally formed on the side walls of the first-stage annular seat (34) and the second-stage annular seat (35). An impact rod (33) is integrally formed on the side walls of the first-stage through hole (31) and the second-stage through hole (32). The impact rod (33) is a hard metal rod. The impact plate (36) is a metal sheet structure cast from spring steel. When the rotating shaft (12) rotates, the impact rod (33) will interfere with the impact plate (36).

9. The purification device for isopropanol waste liquid according to claim 8, characterized in that: A exhaust fan blade (40) is fixedly installed at a position on the rotating shaft (12) between the first-stage condensation structure (4) and the second-stage condensation structure (5). When the reduction motor is driving, the airflow generated by the operation of the exhaust fan blade (40) moves from top to bottom, and the overall flow direction of the gas in the evaporation tank (1) is from bottom to top.

10. A method for purifying isopropanol waste liquid, characterized in that: The purification method of the isopropanol waste liquid is realized by using the purification device for isopropanol waste liquid according to any one of the above claims 4-9. The purification method is as follows: the to-be-treated isopropanol waste liquid is conveyed into the inner cavity of the evaporation tank (1) through the liquid inlet (7), and then the isopropanol and isopropyl acetate in the isopropanol waste liquid are evaporated by the heater (3). When the gaseous isopropanol and isopropyl acetate pass through the first-stage condensation structure (4) and the second-stage condensation structure (5), the gaseous isopropyl acetate will condense into liquid droplets on the condensation rod (19), and then flow down along the condensation rod (19) into the liquid collection cavity (15), and finally flow through the liquid discharge port into the isopropyl acetate collection tank. The gaseous isopropanol will pass through the condensation cavity (17), flow out from the exhaust port (14), and be condensed by a condenser, and finally flow into the isopropanol collection tank for collection.

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