Slurry defoaming solvent recovery device

Abstract

The invention relates to the technical field of ceramic diaphragm production, and particularly provides a slurry defoaming solvent recovery device which comprises an electric control cabinet, a recovery pipe, a vacuum pump, an evaporation tank and a water bucket are arranged in the electric control cabinet, the input end of the vacuum pump is connected with an air inlet pipe, the output end of the vacuum pump is connected with an air outlet pipe, and the input end of the recovery pipe is connected with a slurry tank; the output end of the recovery pipe and the input end of the air inlet pipe are communicated with the side end of the evaporation tank; the upper end of the evaporation tank is connected with an exhaust pipe, and the lower end is connected with a drain pipe; an upper valve, a temporary storage tank and a lower valve are sequentially arranged on the liquid discharge pipe from top to bottom; the vacuum pump is used for achieving the dual-operation function, the upper valve, the temporary storage tank and the lower valve are matched for accurate sequence control for liquid discharging, integration, sealing and high efficiency of defoaming and solvent recycling are achieved, the structure is simple and reliable, the maintenance cost is low, the remarkable industrial application value is achieved, and popularization and application are facilitated. And the method can be widely popularized to the production fields of ceramic diaphragms and other production fields needing slurry defoaming solvent recovery.

Description

Technical Field

[0001] This invention relates to the field of ceramic diaphragm production technology, specifically to a slurry degassing solvent recovery device. Background Technology

[0002] Ceramic membranes, as a functional material with excellent high-temperature resistance, chemical corrosion resistance, high mechanical strength, and stable separation performance, have been widely used in many important fields such as water treatment, food processing, pharmaceutical purification, and chemical catalysis. As downstream application industries continuously increase their requirements for the separation accuracy, throughput, and service life of ceramic membranes, the manufacturing process of ceramic membranes faces the challenge of achieving higher standards of refinement. Among these, the slurry preparation stage, which forms the basis for ceramic membrane molding, directly determines the performance of the final product.

[0003] In the production process of ceramic diaphragms, slurry preparation typically uses ceramic powder as aggregate, supplemented with various components such as binders, dispersants, plasticizers, and solvents. High-speed stirring and ball milling are used to achieve uniform mixing of these components, forming a slurry system with specific viscosity and flowability. However, during stirring and mixing, air is easily entrained into the slurry, forming numerous microbubbles. The presence of these bubbles severely affects the product quality of ceramic diaphragms: in the subsequent casting stage, bubbles may cause defects such as pinholes and dents on the diaphragm surface; during sintering, the bubbles expand and burst due to heat, creating loose pores inside the diaphragm, reducing its mechanical strength and separation efficiency, and even leading to diaphragm scrap, significantly increasing production energy consumption and costs. Therefore, slurry degassing is an indispensable and critical process step in the production of ceramic diaphragms.

[0004] Currently, the commonly used degassing methods for slurries in ceramic diaphragm production mainly include vacuum degassing, centrifugal degassing, ultrasonic degassing, and chemical defoaming. Among these, vacuum degassing has become the most widely used degassing technology in industrial production due to its advantages such as high degassing efficiency, minimal impact on slurry composition, and the ability to achieve continuous operation. Its core principle is to use a vacuum environment to reduce the pressure of the slurry system, causing the solubility of bubbles inside the slurry to decrease and gradually expand, eventually rupturing and escaping from the slurry surface, thereby achieving the purpose of degassing.

[0005] However, during vacuum degassing, organic solvents such as ethanol and toluene in the slurry are highly volatile. Under vacuum, these solvents evaporate in large quantities along with the escaping bubbles, forming a mixed gas containing high concentrations of solvent vapor. Current production processes typically treat this solvent vapor by direct emission into the atmosphere or by simple activated carbon adsorption. These methods have significant drawbacks: firstly, direct emission of solvent vapor causes severe air pollution, violating increasingly stringent national environmental regulations and posing a threat to the health of production workers; secondly, activated carbon adsorption has limited adsorption capacity, requiring frequent replacement of the adsorption material, increasing equipment maintenance costs. Furthermore, saturated activated carbon is classified as hazardous waste, making subsequent treatment difficult and resulting in a significant waste of solvent resources and increased raw material costs. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a slurry degassing solvent recovery device to solve the problems of air pollution, limited adsorption capacity and waste of solvent resources caused by the existing technology of directly emitting into the atmosphere or simply adsorbing solvent vapor gas with activated carbon.

[0007] To achieve the above and other related objectives, the present invention provides a slurry degassing solvent recovery device. The device includes an electrical control cabinet, which houses a recovery pipe, a vacuum pump, an evaporator, and a water tank. The vacuum pump has an inlet pipe connected to its input end and an outlet pipe connected to its output end. The recovery pipe has an inlet pipe connected to the slurry tank, and the output end of the recovery pipe and the inlet pipe are connected to the side end of the evaporator. Heating wires are arranged circumferentially on the inner side of the evaporator. The upper end of the evaporator is connected to an exhaust pipe, and the lower end is connected to a drain pipe. The output end of the drain pipe is connected to a water bucket. The drain pipe is equipped with an upper valve, a temporary storage tank, and a lower valve in sequence from top to bottom.

[0008] In one embodiment of the present invention, at least four evaporators are provided, the exhaust ends of multiple evaporators are connected in series through a first pipe, and the negative pressure ends of multiple evaporators are connected in series through a second pipe.

[0009] In one embodiment of the present invention, at least two vacuum pumps are provided, each vacuum pump has an electrically controlled valve at its output end, and multiple vacuum pumps are controlled by an electrical control cabinet to achieve alternating operation, and each vacuum pump has an independently switchable vacuum pumping mode and a negative pressure pumping mode.

[0010] In one embodiment of the present invention, the device further includes a filter assembly, which includes at least a water filter, an oil filter, and a micro-oil filter. The lower ends of the water filter, the oil filter, and the micro-oil filter are each equipped with a drain, and the output end of the drain is connected to a water tank. The water filter, the oil filter, and the micro-oil filter are connected in series and then installed on the air inlet pipe.

[0011] In one embodiment of the present invention, the water removal filter adopts a pervaporation membrane filter element, wherein the separation layer of the pervaporation membrane is made of polyimide and the support layer is made of porous ceramic, for deep filtration of water generated during evaporation and condensation; the oil removal filter adopts a two-stage filtration structure, including a coalescing filter element with a pore size of 1-5μm and an adsorption filter element with a pore size of 0.1-1μm; the coalescing filter element is made of polypropylene and the adsorption filter element is made of hydrophobically modified resin. The coalescing filter element first polymerizes tiny oil droplets into larger oil droplets for separation, and the adsorption filter element deeply removes residual oil; the micro-oil filter adopts a PTFE membrane filter element with a pore size of 0.0-0.1μm. The PTFE membrane has a pleated structure and a specific surface area ≥10m² / 10-inch filter element, for further filtration of residual oil.

[0012] In one embodiment of the present invention, both the recovery pipe and the exhaust pipe are provided with ball valves.

[0013] In one embodiment of the present invention, the bucket is provided with a float assembly, which includes a float head and a float rod connected to the float head. The upper end of the float rod passes through the upper end of the bucket and can float to the outside.

[0014] In one embodiment of the present invention, a guide seat is mounted on the top of the water bucket via a bracket, and a guide hole is provided on the guide seat. The upper end of the float rod passes through the upper end of the water bucket and floats in the guide hole.

[0015] In one embodiment of the present invention, the electrical control cabinet is configured to: control the vacuum pump to switch between vacuum mode and negative pressure mode; control the start and stop of the vacuum pump and the alternating operation logic of multiple vacuum pumps; control the opening and closing sequence and timing of the upper valve, lower valve, electrically controlled valve and ball valve; and simultaneously control the on / off of the heating wire and the heating power. The electrical control cabinet is equipped with a vacuum degree and negative pressure value display module, a liquid level alarm module, and a temperature display module. The liquid level alarm module is linked to the float assembly, triggering an alarm when the liquid level in the water tank reaches a preset upper or lower limit. The temperature display module displays the temperature inside the evaporator tank in real time.

[0016] In one embodiment of the present invention, the recovery process of the slurry defoaming solvent recovery device includes: S1, Degassing Stage: Close the ball valve of the exhaust pipe, the ball valve of the recovery pipe, and the upper valve, and open the lower valve; control the vacuum pump to switch to vacuum mode via the electrical control cabinet, and evacuate the evaporator to form a vacuum environment of 0.02-0.08MPa; open the ball valve of the recovery pipe, and the evaporator reduces the pressure of the slurry system through the recovery pipe, causing the bubbles inside the slurry to expand, burst, and escape, carrying anhydrous ethanol vapor into the evaporator; S2, Solvent vaporization and condensation stage: Close the ball valve of the recovery pipe, keep the lower valve open and the upper valve closed; control the vacuum pump to switch to negative pressure mode through the electrical control cabinet, draw negative pressure into the evaporator to form a negative pressure environment of 0.01-0.05MPa, reduce the boiling point of anhydrous ethanol to 30-40℃, so that the anhydrous ethanol vapor will quickly vaporize and condense on the inner wall of the evaporator, and the liquid anhydrous ethanol will collect at the lower end of the evaporator; S3, Solvent Temporary Storage Stage: After the liquid anhydrous ethanol in the evaporator has evaporated and condensed, the upper valve is opened and the lower valve is closed, so that the liquid anhydrous ethanol is squeezed into the temporary storage tank. Then the upper valve is closed to complete the solvent temporary storage. S4, Solvent recovery and gas emission stage: Simultaneously open the ball valve and the lower valve of the exhaust pipe, and the non-solvent gas in the evaporator is discharged through the exhaust pipe, while the liquid anhydrous ethanol in the temporary storage tank flows into the water tank through the drain pipe. S5. Repeat steps S1-S4 to achieve continuous recovery of anhydrous ethanol, and avoid leakage of vacuum and negative pressure environment in the evaporator throughout the process.

[0017] As described above, the slurry degassing solvent recovery device of the present invention has the following beneficial effects: 1. This invention is the first to realize the dual function of vacuum pumping for degassing and negative pressure-assisted solvent vaporization, eliminating the need for additional negative pressure pumps or vacuum generating devices, greatly simplifying the equipment structure and reducing the equipment footprint and manufacturing costs. At the same time, the two working modes of the vacuum pump can be seamlessly switched through the electrical control cabinet, forming precise coordination with components such as evaporators and valves: in the vacuuming stage, it can quickly complete slurry degassing, and in the negative pressure stage, it can accurately reduce the solvent boiling point and accelerate solvent vaporization and condensation, making the degassing and solvent recovery processes closely connected, significantly improving work efficiency and greatly shortening the production cycle.

[0018] 2. This invention constructs a closed-loop system for maintaining vacuum and negative pressure, temporarily storing solvent, and safely recovering solvent by setting an upper valve, a temporary storage tank, and a lower valve on the drain pipe of the evaporator, and by using a specific opening sequence. During the degassing and vaporization stages, the design of closing the upper valve and opening the lower valve ensures that the vacuum and negative pressure environment inside the evaporator is not disrupted, preventing gas leakage. During the temporary storage stage, the switching between opening the upper valve and closing the lower valve allows the condensed liquid anhydrous ethanol to flow rapidly into the sealed temporary storage tank, preventing the entry of outside air. During the recovery stage, the ball valve on the exhaust pipe and the lower valve are opened simultaneously, which not only achieves the orderly discharge of non-solvent gases but also ensures that the anhydrous ethanol in the temporary storage tank flows into the water tank in a directional manner. There is no gas leakage or solvent evaporation loss throughout the process, improving the sealing performance of solvent recovery.

[0019] 3. Based on the dual function of the vacuum pump to ensure degassing and vaporization efficiency, the present invention provides a three-stage filtration assembly connected in series on the air inlet pipe to simultaneously play a protective and purifying role: the water removal filter removes moisture to prevent the vacuum pump from rusting and the solvent from having excessive water content; the oil removal filter and the micro-oil filter intercept oil stains, trace amounts of oil mist and impurities to prevent wear on key components of the vacuum pump.

[0020] 4. This invention, through a parallel processing design with at least four evaporators connected in series, can greatly expand the solvent vapor processing capacity under consistent pressure. Combined with a redundant design of at least two vacuum pumps operating alternately, it avoids production interruptions caused by the failure or maintenance of a single vacuum pump, ensuring a continuous and stable vacuum and negative pressure environment. The automated control cabinet enables integrated operation of vacuum pump mode switching, valve switching, and liquid level monitoring, eliminating the need for frequent manual intervention. This meets the continuous operation requirements of ceramic diaphragm production lines and significantly reduces labor costs.

[0021] 5. This invention, through the recovery of anhydrous ethanol, avoids air pollution caused by the direct emission of solvent vapors, complies with national environmental protection regulations, eliminates threats to the health of production personnel, and improves the working environment. Compared with the existing technology that uses activated carbon adsorption, this invention overcomes the limitations of adsorption capacity, reduces the frequency of adsorption material replacement, significantly reduces equipment maintenance costs, and avoids the problem of hazardous waste disposal from saturated activated carbon. Furthermore, by efficiently recovering solvent resources, waste is reduced, and the recovered solvent can be purified or directly recycled for slurry preparation, reducing raw material costs and balancing environmental benefits with economic value. Attached Figure Description

[0022] Figure 1 The diagram shown is an external structural schematic of the slurry degassing solvent recovery device disclosed in this invention.

[0023] Figure 2 The diagram shown is a schematic of the slurry degassing solvent recovery device disclosed in this invention, excluding the electrical control cabinet.

[0024] Figure 3 The diagram shown is a structural schematic of the slurry degassing solvent recovery device disclosed in this invention, with the electrical control cabinet removed from the view.

[0025] Figure 4 The diagram shown is a front view of the slurry degassing solvent recovery device disclosed in this invention, excluding the electrical control cabinet.

[0026] Figure 5 The diagram shown is a top view of the slurry degassing solvent recovery device disclosed in this invention, excluding the electrical control cabinet.

[0027] Figure 6 The diagram shown is an enlarged structural schematic of the slurry degassing solvent recovery device disclosed in this invention, which includes multiple evaporators.

[0028] Figure 7 Displayed as Figure 6 A cross-sectional structural diagram of a single evaporator.

[0029] Figure 8 The diagram shown is an enlarged structural schematic of the filter assembly in the slurry degassing solvent recovery device disclosed in this invention.

[0030] Figure 9 The diagram shown is an enlarged view of the structure of the slurry degassing solvent recovery device disclosed in this invention, which is in conjunction with the guide seat.

[0031] Component designation explanation 1. Recovery pipe; 2. Vacuum pump; 3. Inlet pipe; 4. Evaporator; 5. Evaporator; 6. Exhaust pipe; 7. Drain pipe; 8. Water tank; 9. Filter assembly; 91. Water removal filter; 92. Oil removal filter; 93. Micro-oil filter; 94. Drainer; 10. Electrical control cabinet; 11. Upper valve; 12. Temporary storage tank; 13. Lower valve; 14. First pipeline; 15. Second pipeline; 16. Electrical control valve; 17. Ball valve; 18. Float assembly; 181. Float head; 182. Float rod; 19. Guide seat; 191. Guide hole. Detailed Implementation

[0032] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0033] Please see Figures 1 to 9It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of the invention, should fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0034] Please see Figures 1-5 This invention provides a slurry degassing solvent recovery device. The device includes an electrical control cabinet 10, which houses a recovery pipe 1, a vacuum pump 2, an evaporator 5, and a water tank 8. The vacuum pump 2 has an inlet pipe 3 connected to its input end and an outlet pipe 4 connected to its output end. The recovery pipe 1 has its input end connected to the slurry tank, and its output end and the inlet pipe 3 are connected to the side end of the evaporator 4. The evaporator 5 has heating wires arranged circumferentially on its inner side. The evaporator 5 has an exhaust pipe 6 connected to its upper end and a drain pipe 7 connected to its lower end. The drain pipe 7 has its output end connected to the water tank 8. Ball valves 1 are installed on both the recovery pipe 1 and the exhaust pipe 6. 7; This invention achieves for the first time that the vacuum pump 2 has the dual functions of vacuum degassing and negative pressure assisted solvent vaporization, without the need for additional negative pressure pumps or vacuum generating devices, greatly simplifying the equipment structure and reducing the equipment footprint and manufacturing costs; at the same time, the two working modes of the vacuum pump 2 can be seamlessly switched through the electrical control cabinet 10, and can form precise coordination with components such as the evaporator 5 and valves: in the vacuum stage, it can quickly complete the slurry degassing, and in the negative pressure stage, it can accurately reduce the solvent boiling point and accelerate solvent vaporization and condensation, making the degassing and solvent recovery processes closely connected, significantly improving the operating efficiency and greatly shortening the production cycle.

[0035] Please see Figures 6-7The drain pipe 7 is equipped with an upper valve 11, a temporary storage tank 12, and a lower valve 13, arranged sequentially from top to bottom. At least four evaporators 2 are provided, with their exhaust ends connected in series via a first pipe 14, and their negative pressure extraction ends connected in series via a second pipe 15. At least two vacuum pumps 2 are provided, each with an electrically controlled valve 16 at its output end. Multiple vacuum pumps 2 are controlled by an electrical control cabinet 10 to operate alternately, ensuring a continuous and stable vacuum environment. Each vacuum pump 2 has an independently switchable vacuum extraction mode and a negative pressure extraction mode. This invention, through the parallel processing design of at least four evaporators 5 connected in series, greatly expands the solvent vapor processing capacity under consistent pressure. Combined with the redundant design of at least two vacuum pumps 2 operating alternately, it avoids production interruptions due to the failure or maintenance of a single vacuum pump 2, ensuring a continuous and stable vacuum and negative pressure environment. The automated control of the electrical control cabinet 10 achieves integrated operation of vacuum pump mode switching, valve switching, and liquid level monitoring, eliminating the need for frequent manual intervention. This meets the continuous operation requirements of ceramic diaphragm production lines and significantly reduces labor costs.

[0036] This invention constructs a closed-loop system for maintaining vacuum and negative pressure, temporarily storing solvent, and safely recovering solvent by setting an upper valve 11, a temporary storage tank 12, and a lower valve 13 on the drain pipe 7 of the evaporator 5, and a specific opening sequence. During the degassing and vaporization stage, the design of closing the upper valve 11 and opening the lower valve 13 ensures that the vacuum and negative pressure environment inside the evaporator 5 is not disrupted, avoiding gas leakage. During the temporary storage stage, the switching of opening the upper valve 11 and closing the lower valve 13 allows the condensed liquid anhydrous ethanol to flow rapidly into the sealed temporary storage tank 12, preventing the entry of outside air. During the recovery stage, the ball valve 17 on the exhaust pipe 6 and the lower valve 13 are opened simultaneously, which not only achieves the orderly discharge of non-solvent gases, but also ensures that the anhydrous ethanol in the temporary storage tank 12 flows into the water tank in a directional manner. The entire process is free of gas leakage and solvent evaporation loss, improving the sealing performance of solvent recovery.

[0037] Please see Figure 8The device also includes a filter assembly 9, which includes at least a water filter 91, an oil filter 92, and a micro-oil filter 93. Each of the water filter 91, the oil filter 92, and the micro-oil filter 93 is equipped with a drain 94 at its lower end, and the output end of the drain 94 is connected to a water tank 8. The water filter 91, the oil filter 92, and the micro-oil filter 93 are connected in series and then installed on the air inlet pipe 3. The water removal filter 91 uses a pervaporation membrane filter element. The separation layer of the pervaporation membrane is made of polyimide, and the support layer is made of porous ceramic. It is used for deep filtration of water generated during evaporation and condensation. The oil removal filter 92 adopts a two-stage filtration structure, including a coalescing filter element with a pore size of 1-5μm and an adsorption filter element with a pore size of 0.1-1μm. The coalescing filter element is made of polypropylene, and the adsorption filter element is made of hydrophobically modified resin. The coalescing filter element first polymerizes tiny oil droplets into larger oil droplets for separation, and the adsorption filter element deeply removes residual oil. The micro-oil filter 93 uses a PTFE membrane filter element with a pore size of 0.0-0.1μm. The PTFE membrane has a pleated structure and a specific surface area ≥10m² / 10-inch filter element. It is used for further filtration of residual oil. Based on the dual function of the vacuum pump 2 to ensure degassing and vaporization efficiency, the present invention provides a three-stage filtration assembly 9 connected in series on the air inlet pipe to simultaneously play a protective and purifying role: the water removal filter 91 removes moisture to prevent the vacuum pump from rusting and the solvent from having excessive water content; the oil removal filter 92 and the micro oil filter 93 intercept oil stains, trace amounts of oil mist and impurities to prevent wear on key components of the vacuum pump 2.

[0038] Please see Figure 9 The bucket 8 is equipped with a float assembly 18, which includes a float head 181 and a float rod 182 connected to the float head 181. The upper end of the float rod 182 passes through the upper end of the bucket 8 and can float to the outside. A guide seat 19 is mounted on the top of the bucket 8 via a bracket. A guide hole 191 is provided on the guide seat 19. The upper end of the float rod 182 passes through the upper end of the bucket 8 and floats in the guide hole 191.

[0039] The electrical control cabinet 10 is configured to: control the vacuum pump 2 to switch between vacuum mode and negative pressure mode; control the start and stop of the vacuum pump 2 and the alternating operation logic of multiple vacuum pumps; control the opening and closing sequence and timing of the upper valve 11, lower valve 13, electric control valve 16 and ball valve 17; and simultaneously control the on / off state of the heating wire and the heating power. The electrical control cabinet 10 is equipped with a vacuum degree and negative pressure value display module, a liquid level alarm module, and a temperature display module. The liquid level alarm module is linked with the float assembly 18, and triggers an alarm when the liquid level in the water tank 8 reaches the preset upper or lower limit. The temperature display module displays the temperature in the evaporator tank 5 in real time.

[0040] Based on the above, the recovery process of the slurry defoaming solvent recovery device provided by the present invention includes: S1, Degassing stage: Close the ball valve 17 of the exhaust pipe 6, the ball valve 17 of the recovery pipe 1, and the upper valve 11, and open the lower valve 13; control the vacuum pump 2 to switch to vacuum mode through the electrical control cabinet 10, and evacuate the evaporator 5 to form a vacuum environment of 0.02-0.08MPa; open the ball valve 17 of the recovery pipe 1, and the evaporator 5 reduces the pressure of the slurry system through the recovery pipe 1, causing the bubbles inside the slurry to expand, burst, and escape, carrying anhydrous ethanol vapor into the evaporator 5; S2, Solvent vaporization and condensation stage: Close the ball valve 17 of the recovery pipe 1, keep the lower valve 13 open and the upper valve 11 closed; control the vacuum pump 2 to switch to negative pressure mode through the electrical control cabinet 10, draw negative pressure to the evaporator 5 to form a negative pressure environment of 0.01-0.05MPa, reduce the boiling point of anhydrous ethanol to 30-40℃, so that the anhydrous ethanol vapor will quickly vaporize and condense on the inner wall of the evaporator 5, and the liquid anhydrous ethanol will collect at the lower end of the evaporator 5; S3, Solvent Temporary Storage Stage: After the liquid anhydrous ethanol in the evaporator 5 has evaporated and condensed, control the upper valve 11 to open and the lower valve 13 to close, so that the liquid anhydrous ethanol is squeezed into the temporary storage tank 12. Then close the upper valve 11 to complete the solvent temporary storage. S4, Solvent recovery and gas emission stage: Simultaneously open the ball valve 17 and the lower valve 13 of the exhaust pipe 6. The non-solvent gas in the evaporator 5 is discharged through the exhaust pipe 6, and the liquid anhydrous ethanol in the temporary storage tank 12 flows into the water tank 8 through the drain pipe 7. S5. Repeat steps S1-S4 to achieve continuous recovery of anhydrous ethanol, and avoid leakage of vacuum and negative pressure environment in evaporator 5 throughout the process.

[0041] This recycling process achieves dual synergy between slurry degassing and solvent vaporization and condensation through vacuum pumping and negative pressure assisted by vacuum pumping. Combined with precise opening and closing control of the upper valve, temporary storage tank, and lower valve on the drain pipe, it ensures that the vacuum environment inside the evaporator does not leak during the degassing and condensation stages. Furthermore, the orderly switching between buffering, venting, and recycling in the temporary storage tank prevents solvent vapor escape. At the same time, the three-stage filter assembly connected in series on the air inlet pipe effectively intercepts oil and water impurities to protect the vacuum pump and purify the solvent. Ultimately, it achieves efficient slurry degassing and continuous recovery of anhydrous ethanol with high recovery rate and high purity, meeting the continuous production requirements of the ceramic diaphragm production line.

[0042] In summary, this invention utilizes a vacuum pump 2 to achieve dual operation functions, coupled with precise sequential control of the upper valve 11, temporary storage tank 12, and lower valve 13 for liquid discharge. This achieves integrated, sealed, and highly efficient degassing and solvent recovery, with a simple and reliable structure, low maintenance costs, and significant industrial application value. It can be widely applied to ceramic membrane and other production fields requiring slurry degassing and solvent recovery. By recovering anhydrous ethanol, this invention avoids air pollution caused by direct solvent vapor emissions, complying with national environmental regulations and eliminating threats to the health of production personnel, thus improving the working environment. Compared to existing technologies using activated carbon adsorption, this invention overcomes adsorption capacity limitations, reduces the frequency of adsorption material replacement, significantly lowers equipment maintenance costs, and avoids the hazardous waste disposal problem of saturated activated carbon. Furthermore, by efficiently recovering solvent resources, waste is reduced, and the recovered solvent can be further purified or directly recycled for slurry preparation, reducing raw material costs and balancing environmental benefits and economic value. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial application value.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A slurry degassing solvent recovery device, characterized in that: The device includes an electrical control cabinet (10), which contains a recovery pipe (1), a vacuum pump (2), an evaporator (5), and a water tank (8). The vacuum pump (2) has an inlet pipe (3) connected to its input end and an outlet pipe (4) connected to its output end. The recovery pipe (1) has an inlet pipe (1) connected to a slurry tank, and the output end of the recovery pipe (1) and the inlet pipe (3) are connected to the side end of the evaporator (4). The evaporator (5) is provided with heating wires circumferentially arranged on the inner side. The upper end of the evaporator (5) is connected to an exhaust pipe (6) and the lower end is connected to a drain pipe (7). The output end of the drain pipe (7) is connected to a water bucket (8). The drain pipe (7) is equipped with an upper valve (11), a temporary storage tank (12), and a lower valve (13) from top to bottom.

2. The slurry defoaming solvent recovery device according to claim 1, characterized in that: The evaporator (2) is provided with at least four, and the exhaust ends of multiple evaporators (2) are connected in series through a first pipe (14), and the negative pressure ends of multiple evaporators (2) are connected in series through a second pipe (15).

3. The slurry defoaming solvent recovery device according to claim 1, characterized in that: At least two vacuum pumps (2) are provided. Each vacuum pump (2) has an electric control valve (16) at its output end. Multiple vacuum pumps (2) are controlled by an electric control cabinet (10) to achieve alternating operation. Each vacuum pump (2) has an independently switchable vacuum pumping mode and negative pressure pumping mode.

4. The slurry defoaming solvent recovery device according to claim 1, characterized in that: The device also includes a filter assembly (9), which includes at least a water filter (91), an oil filter (92), and a micro oil filter (93). The lower ends of the water filter (91), the oil filter (92), and the micro oil filter (93) are each equipped with a drainer (94), and the output end of the drainer (94) is connected to a water tank (8). The water filter (91), the oil filter (92), and the micro oil filter (93) are connected in series and then installed on the air inlet pipe (3).

5. The slurry degassing solvent recovery device according to claim 4, characterized in that: The water removal filter (91) uses a pervaporation membrane filter element. The separation layer of the pervaporation membrane is made of polyimide, and the support layer is made of porous ceramic. It is used for deep filtration of water generated during evaporation and condensation. The oil removal filter (92) adopts a two-stage filtration structure, including a coalescing filter element with a 1-5μm pore size and an adsorption filter element with a 0.1-1μm pore size. The coalescing filter element is made of polypropylene, and the adsorption filter element is made of hydrophobic modified resin. The coalescing filter element first polymerizes small oil droplets into large oil droplets for separation, and the adsorption filter element deeply removes residual oil. The micro-oil filter (93) uses a PTFE membrane filter element with a 0.0-0.1μm pore size. The PTFE membrane has a pleated structure and a specific surface area ≥10m² / 10-inch filter element. It is used for further filtration of residual oil.

6. The slurry degassing solvent recovery device according to claim 1, characterized in that: Both the recovery pipe (1) and the exhaust pipe (6) are equipped with ball valves (17).

7. The slurry degassing solvent recovery device according to claim 1, characterized in that: The bucket (8) is provided with a float assembly (18), which includes a float head (181) and a float rod (182) connected to the float head (181). The upper end of the float rod (182) passes through the upper end of the bucket (8) and can float to the outside.

8. The slurry defoaming solvent recovery device according to claim 7, characterized in that: A guide seat (19) is mounted on the top of the bucket (8) via a bracket. A guide hole (191) is provided on the guide seat (19). The upper end of the float (182) passes through the upper end of the bucket (8) and floats in the guide hole (191).

9. The slurry defoaming solvent recovery device according to any one of claims 1-8, characterized in that, The electrical control cabinet (10) is configured to: control the vacuum pump (2) to switch between vacuum mode and negative pressure mode, control the start and stop of the vacuum pump (2) and the alternating operation logic of multiple vacuum pumps, control the opening and closing sequence and timing of the upper valve (11), lower valve (13), electric control valve (16) and ball valve (17), and control the on / off of the heating wire and the heating power; and the electrical control cabinet (10) is equipped with a vacuum degree and negative pressure value display module, a liquid level alarm module, and a temperature display module. The liquid level alarm module is linked with the float assembly (18) and triggers an alarm when the liquid level in the water tank (8) reaches the preset upper or lower limit; the temperature display module displays the temperature in the evaporator (5) in real time.

10. The slurry defoaming solvent recovery device according to claim 9, characterized in that, The recovery process of the slurry defoaming solvent recovery device includes: S1, Degassing stage: Close the ball valve (17) of the exhaust pipe (6), the ball valve (17) of the recovery pipe (1) and the upper valve (11), and open the lower valve (13); control the vacuum pump (2) to switch to vacuum mode through the electrical control cabinet (10) to create a vacuum environment of 0.02-0.08MPa in the evaporator (5); open the ball valve (17) of the recovery pipe (1), and the evaporator (5) reduces the pressure of the slurry system through the recovery pipe (1), causing the bubbles inside the slurry to expand, break and escape, carrying anhydrous ethanol vapor into the evaporator (5); S2, Solvent vaporization and condensation stage: Close the ball valve (17) of the recovery pipe (1), keep the lower valve (13) open and the upper valve (11) closed; control the vacuum pump (2) to switch to negative pressure mode through the electrical control cabinet (10), draw negative pressure to the evaporator (5) to form a negative pressure environment of 0.01-0.05MPa, reduce the boiling point of anhydrous ethanol to 30-40℃, so that the anhydrous ethanol vapor will vaporize rapidly and condense on the inner wall of the evaporator (5), and the liquid anhydrous ethanol will collect at the lower end of the evaporator (5); S3, Solvent temporary storage stage: After the liquid anhydrous ethanol in the evaporator (5) evaporates and condenses, control the upper valve (11) to open and the lower valve (13) to close, so that the liquid anhydrous ethanol is squeezed into the temporary storage tank (12), and then the upper valve (11) is closed to complete the solvent temporary storage; S4, Solvent recovery and gas emission stage: Simultaneously open the ball valve (17) and the lower valve (13) of the exhaust pipe (6), and the non-solvent gas in the evaporator (5) is discharged through the exhaust pipe (6), and the liquid anhydrous ethanol in the temporary storage tank (12) flows into the water tank (8) through the drain pipe (7). S5. Repeat steps S1-S4 to achieve continuous recovery of anhydrous ethanol and avoid leakage of vacuum and negative pressure environment in evaporator (5) throughout the process.

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