Proportioning device for ultrafiltration membrane production

Abstract

The utility model discloses an ultrafiltration membrane production batching device, and relates to the technical field of filter membrane preparation devices, the ultrafiltration membrane production batching device comprises a material powder tank used for storing material powder, a first stirring device is arranged in an inner cavity of the material powder tank, and a first temperature sensor is arranged in the inner cavity of the material powder tank; the liquid storage tank is arranged on the periphery of the material powder tank, the liquid storage tank is communicated with the liquid supply tank, and the liquid supply tank conveys reaction liquid to the liquid storage tank; the reaction kettle is communicated with the liquid storage tank and the material powder tank, a second stirring device used for mixing material powder and reaction liquid is arranged in an inner cavity of the reaction kettle, a second temperature sensor is arranged in the inner cavity of the reaction kettle, and heating nets and heat preservation sleeves are arranged on the peripheries of the material powder tank and the reaction kettle; the control device is used for controlling starting and stopping of the first stirring device, the second stirring device and the heating net, and the technical problems that in the production process of an ultrafiltration membrane, the water content in material powder is high, phase separation occurs in advance, heating drying treatment is carried out, and the material powder is caked and difficult to fully dissolve due to the high temperature are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of filter membrane preparation equipment, and in particular to an ultrafiltration membrane production batching device. Background Technology

[0002] A filter membrane is a separation medium, mostly made of synthetic materials, and exhibits typical selective permeability. Ultrafiltration membranes separate particles ranging in size from 10 to 100 nm, including macromolecules, colloids, and proteins in aqueous solutions. The solvent-free phase inversion method is the main preparation method for ultrafiltration membranes. First, the raw materials are thoroughly mixed by stirring to form a homogeneous casting solution. This solution is then cast into flat or cylindrical shapes using a casting method, or into hollow fiber shapes using extrusion spinning. Subsequently, the solvent on the membrane surface is partially evaporated or retained, and the membrane is immersed in a solvent-free coagulation solution. Liquid-liquid phase separation between the organic solvent and the solvent-free solution initiates the formation of a polymer-depleted phase and a polymer-rich phase. The polymer-rich phase eventually gels and transforms into the membrane, while the polymer-depleted phase becomes the membrane pores. After appropriate treatment, a mature ultrafiltration membrane is obtained.

[0003] The preparation of ultrafiltration membranes requires a high moisture content in the raw material powder. If the powder contains moisture, phase separation may occur prematurely during membrane formation, affecting product quality. Therefore, powders with high moisture content need to be dehydrated and dried. After dehydration and drying, the powder particles absorb a large amount of heat energy, resulting in a high surface energy. The powder particles tend to aggregate to reach a stable state, which can easily cause powder agglomeration. This makes liquid-material mixing difficult when mixed with low-temperature solvents.

[0004] In summary, developing an ultrafiltration membrane production batching device that avoids premature phase separation and agglomeration of powder and improves the quality of casting solution is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a batching device for ultrafiltration membrane production, which solves the technical problems of the powder containing moisture in the preparation of casting solution and the powder clumping after dehydration and drying, making it difficult to mix with low-temperature solvents.

[0006] To achieve the above objectives, this utility model provides an ultrafiltration membrane production feed preparation device, comprising:

[0007] A powder tank is used to store powder. The inner cavity of the powder tank is rotatably equipped with a first stirring device for stirring the powder. The inner cavity of the powder tank is equipped with a first temperature sensor.

[0008] A liquid storage tank is located around the powder tank. The liquid storage tank is connected to a liquid supply tank, and the liquid supply tank delivers the reaction liquid to the liquid storage tank.

[0009] The reactor is connected to the liquid storage tank and the powder tank. The reactor cavity is equipped with a second stirring device for mixing the powder and the reaction liquid. The reactor cavity is also equipped with a second temperature sensor. Both the powder tank and the reactor are equipped with heating nets and insulation sleeves.

[0010] The control device is connected to the first temperature sensor and the second temperature sensor. The control device is used to control the start and stop of the first stirring device, the second stirring device and the heating grid.

[0011] Preferably, the first stirring device includes a first motor connected to a first drive rod, and a plurality of first stirring rods extend from the outer wall of the first drive rod. The ends of the first stirring rods away from the first drive rod are provided with scrapers, and the scrapers are in contact with the inner wall of the powder tank. The second stirring device includes a second motor connected to a second drive rod, and a plurality of second stirring rods extend from the outer wall of the second drive rod.

[0012] Preferably, both the powder tank and the reactor are connected to a vacuum pump, and both the powder tank and the liquid supply tank are provided with a feed inlet at the top.

[0013] Preferably, a vacuum valve is provided between the powder tank, the reactor, and each vacuum pump; a feed valve is provided between the liquid storage tank, the powder tank, and the reactor; a metering pump is provided between the liquid storage tank and the liquid supply tank; and the metering pump, each feed valve, and each vacuum valve are all connected to the control device via signal connection.

[0014] Preferably, the first stirring rod and the second stirring rod are respectively arranged perpendicularly to the first driving rod and the second driving rod, and the first stirring rod and the second stirring rod are evenly arranged along the extension direction of the first driving rod.

[0015] Preferably, the top of the reactor is equipped with an exhaust valve, which is used to balance the pressure inside and outside the reactor and to discharge harmful gases produced by the reaction.

[0016] Preferably, the reactor is provided with a discharge pipe at the end opposite to the exhaust valve, and the discharge pipe is used to output the reacted powder and reaction liquid.

[0017] Compared to the aforementioned background technology, the ultrafiltration membrane production feeder provided by this utility model includes: a powder tank for storing powder, a first stirring device installed in the inner cavity of the powder tank, a first temperature sensor installed on the inner wall of the powder tank, a storage tank installed on the outer periphery of the powder tank, the storage tank receiving the reaction liquid output from the supply tank, both the powder tank and the storage tank being connected to a reaction vessel, a second stirring device installed in the inner cavity of the reaction vessel, a heating grid and an insulation sleeve installed on the outer walls of the reaction vessel and the storage tank, a second temperature sensor installed on the inner wall of the reaction vessel, and the first and second temperature sensors being signal-connected. A control device activates the first stirring device and the heating grid on the outer periphery of the powder tank, the heating grid transferring heat to the powder in the powder tank to evaporate the moisture in the powder, while the first stirring device maintains heat. To ensure uniform heating of the powder in each area, the first temperature sensor monitors the temperature inside the powder tank in real time and feeds the temperature signal back to the control device. When the control device detects that the temperature inside the powder tank has reached the preset temperature, it stops the first stirring device to complete the drying of the powder. The control device then directs the reaction liquid in the supply cylinder to flow into the storage tank located around the powder tank to absorb the residual heat of the powder tank, assisting in cooling the powder and preventing it from agglomerating. At the same time, the temperature of the reaction liquid increases, improving the solubility of the powder in the reaction liquid. When the temperature of the powder drops to a suitable value, the powder and reaction liquid are fed into the reaction vessel together. The control device then activates the second stirring device and the heating grid around the reaction vessel to stir and heat the mixture of powder and reaction liquid, completing the preparation of the casting solution. 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 description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a structural diagram of the ultrafiltration membrane production feed preparation device provided in an embodiment of the present invention;

[0020] Figure 2 A cross-sectional view of the liquid storage tank and the powder tank provided in the embodiment of this utility model;

[0021] Figure 3 This is a cross-sectional view of the reactor provided in an embodiment of the present invention.

[0022] Among them, 1-Powder tank; 2-Liquid storage tank; 3-Liquid supply tank; 4-Reaction vessel; 51-First motor; 52-First drive rod; 53-First stirring rod; 54-Scraper; 61-Second motor; 62-Second drive rod; 63-Second stirring rod; 7-Heating grid; 8-Insulation sleeve; 9-First temperature sensor; 10-Second temperature sensor; 11-Vacuum pump; 12-Feed valve; 13-Vacuum valve; 14-Metering pump; 15-Exhaust valve; 16-Feed inlet; 17-Discharge pipe. Detailed Implementation

[0023] 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.

[0024] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] This utility model provides an ultrafiltration membrane production batching device, which includes a powder tank 1 for storing powder, a first stirring device in the inner cavity of the powder tank 1, a first temperature sensor in the inner cavity of the powder tank 1, a liquid storage tank 2 on the outer periphery of the powder tank 1, the inner side wall of the liquid storage tank 2 being attached to the outer side wall of the powder tank 1, the liquid storage tank 2 being connected to a liquid supply tank 3, the liquid storage tank 2 receiving the reaction liquid output from the liquid supply tank 3, both the liquid storage tank 2 and the powder tank 1 being connected to a reaction vessel 4, the inner wall of the reaction vessel 4 being provided with a second temperature sensor 10 and a second stirring device, both the outer walls of the reaction vessel 4 and the powder tank 1 being wrapped with a heating mesh 7 and a heat insulation sleeve 8, and both the first temperature sensor 9 and the second temperature sensor 10 being signal connected to a control device (not shown in the figure).

[0026] When preparing the casting solution according to this application, the control device activates the first stirring device and the heating grid 7 around the powder tank 1. The heating grid 7 heats the powder, evaporating the moisture in the powder to ensure its dryness. Simultaneously, the first stirring device operates to ensure uniform heating of the powder in each area. The first temperature sensor 9 detects the temperature inside the powder tank 1. When the control device detects that the temperature inside the powder tank 1 has reached a preset value, the control device stops the operation of the first stirring device and shuts off the heating grid 7. The control device then transfers the reaction liquid from the supply tank 3 to the storage tank 2. The reaction liquid in the storage tank 2 absorbs the heat from the powder, assisting in cooling the powder and preventing agglomeration, while simultaneously improving the reaction efficiency. The temperature of the liquid makes it easier for the powder to dissolve in the reaction solution. When the powder drops to the target temperature, the powder and reaction solution are transported to the reaction vessel 4. The control device starts the second stirring device and the heating net 7 around the reaction vessel 4. While the second stirring device stirs the mixture, the heating net 7 heats the mixture. When the second temperature sensor 10 detects that the reaction solution has reached the preset temperature, the heating net 7 is turned off to provide a suitable environment for the reaction. After stirring for a certain period of time, the speed of the second stirring device is reduced to degas the mixture and eliminate the bubbles in the mixture. After degassing for a certain period of time, the operation of the second stirring device is stopped, and the preparation of the casting solution is completed.

[0027] Please refer to the instruction manual appendix. Figure 2 With appendix Figure 3 The first stirring device includes a first motor 51 fixed to the top of the powder tank 1. The output end of the first motor 51 is connected to a first drive rod 52, which extends into the inner cavity of the powder tank 1. Preferably, the first drive rod 52 is coaxially arranged with the powder tank 1. A plurality of first stirring rods 53 are provided along the outer periphery of the first drive rod 52. The first stirring rods 53 are arranged perpendicularly to the first drive rod 52. A scraper 54 is provided at the end of the first stirring rod 53 facing away from the first drive rod 52. The scraper 54 is in contact with the inner wall of the powder tank 1. During the operation of machine 51, the first drive rod 52 drives the scraper 54 through the first stirring rod 53. The scraper 54 scrapes the inner wall of the powder tank 1 and scrapes off the powder adhering to the side wall of the powder tank 1, so as to prevent the powder accumulated on the powder tank 1 from being continuously heated and causing the powder on the side wall to clump. Similarly, the second stirring device in the reactor 4 includes a second motor 61 and a second drive rod 62. The second drive rod 62 is provided with a second stirring rod 63 perpendicular to it. The second stirring rod 63 stirs the reaction liquid in the reactor 4 so that the powder and the reaction liquid are fully mixed.

[0028] Preferably, the first stirring rods 53 are symmetrically distributed on both sides of the first driving rod 62, and the first stirring rods 53 on both sides are located on the same horizontal line. The pairs of first stirring rods 53 can be specifically divided into three groups, and the first stirring rods 53 in each group are evenly spaced to ensure that the first stirring device can stir the powder in different areas of the powder tank 1. The second stirring rods 63 are staggered on both sides of the second driving rod 62, and the axes of each second stirring rod 63 are located in the same plane. When the second driving rod 62 rotates, the second stirring rods 63 on both sides stir the reaction liquid in different positions, so that the reaction liquid in different areas flows between different areas, and the reaction liquid and the powder are mixed more thoroughly.

[0029] Please refer to the instruction manual appendix. Figure 1 Vacuum pumps 11 are connected to the inner cavities of both the powder tank 1 and the reactor 4. Vacuum valve 13 between vacuum pump 11 and powder tank 1 is designated as the first vacuum valve, and vacuum valve 13 between vacuum pump 11 and reactor 4 is designated as the second vacuum valve. Additionally, feed valves 12 are provided between powder tank 1, storage tank 2, and reactor 4, and metering pumps 14 are provided between storage tank 2 and supply tank 3. Each vacuum valve 13, feed valve 12, and metering pump 14 is connected to a control device. During the preparation of the casting solution for the ultrafiltration membrane, before the first stirring device is started, the control device extracts water from the powder tank 1 through the first vacuum valve. To prevent air from being trapped inside the powder when the first stirring device agitates it, thus avoiding the generation of bubbles in the mixture after the powder is mixed with the reaction liquid; after dehumidification by the heating mesh 7, some water vapor escapes into the powder tank 1, and the first vacuum valve operates again to separate the escaped water vapor from the powder tank 1, preventing water vapor from adhering to the powder surface after the temperature drops; after the second stirring device mixes the powder with the reaction liquid, the control device reduces the speed of the second stirring device while opening the second vacuum valve, and the vacuum pump 11 evacuates the reaction vessel 4 to prevent the second stirring rod 63 from generating bubbles during the stirring process, which would affect the degassing effect.

[0030] Both the powder tank 1 and the liquid storage tank 2 are equipped with inlets 16 at the top. Operators add powder and reaction liquid through the inlets 16. The top of the reactor 4 is equipped with an exhaust valve 15. The exhaust valve 15 extracts harmful gases generated during the reaction of powder and reaction liquid. The harmful gases are transported to the purification device through the exhaust pipe. The bottom of the reactor 4 is equipped with a discharge pipe 17. After the powder and reaction liquid have completed the degassing process, the exhaust valve 15 is opened to connect the inner cavity of the reactor 4 with the outside world, so that the gas pressure inside the reactor 4 returns to normal. Then, the discharge pipe 17 is opened to discharge the prepared casting liquid.

[0031] In one embodiment of this application, the control device opens the first vacuum valve and uses the vacuum pump 11 to extract air from the inner cavity of the powder tank 1. Once the powder tank 1 is under vacuum, the first stirring device and the heating mesh 7 around the powder pipe are activated to dry and dehumidify the powder. After the drying process is complete, the metering pump 14 extracts a specified volume of reaction liquid from the supply tank 3 and transfers the reaction liquid to the storage tank 2. The reaction liquid cools the powder. When the powder reaches a suitable temperature, the feed valves 12 are opened, and the powder and reaction liquid enter the reaction vessel 4 together. The control device is then activated. The second stirring device and the heating mesh 7 around the reactor 4 ensure thorough mixing and reaction of the reaction liquid and powder. The exhaust valve 15 discharges harmful gases generated during the reaction and maintains stable pressure within the reactor 4, allowing the reaction to continue. After the reaction is complete, the control device reduces the speed of the second stirring device to degas the mixture. Simultaneously, the control device activates the second vacuum valve, and the vacuum pump 11 extracts air from the reactor 4 to prevent the second stirring device from generating bubbles during liquid agitation, which would affect the degassing effect and accelerate phase separation of the mixture. After degassing, the exhaust valve 15 is opened to eliminate the negative pressure within the reactor 4, and the prepared casting liquid is discharged through the discharge pipe 17.

[0032] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0033] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A batching device for ultrafiltration membrane production, characterized in that, include: A powder tank (1) is used to store powder. The inner cavity of the powder tank (1) is rotatably provided with a first stirring device. The first stirring device is used to stir the powder. The inner cavity of the powder tank (1) is provided with a first temperature sensor (9). A storage tank (2) is located on the outer periphery of the powder tank (1). The storage tank (2) is connected to a supply tank (3), and the supply tank (3) supplies the reaction liquid to the storage tank (2). The reactor (4) is connected to the liquid storage tank (2) and the powder tank (1). The reactor (4) is equipped with a second stirring device in its inner cavity. The second stirring device is used to mix the powder and the reaction liquid. The reactor (4) is equipped with a second temperature sensor (10). The powder tank (1) and the reactor (4) are both equipped with a heating net (7) and a heat preservation sleeve (8) on their outer periphery. The control device is connected to the first temperature sensor (9) and the second temperature sensor (10) for signal control. The control device is used to control the start and stop of the first stirring device, the second stirring device and the heating grid (7).

2. The ultrafiltration membrane production feed preparation device according to claim 1, characterized in that, The first stirring device includes a first motor (51), which is connected to a first drive rod (52). The outer wall of the first drive rod (52) extends a plurality of first stirring rods (53). The ends of the first stirring rods (53) away from the first drive rod (52) are provided with scrapers (54), and the scrapers (54) are in contact with the inner wall of the powder tank (1). The second stirring device includes a second motor (61), which is connected to a second drive rod (62). The outer wall of the second drive rod (62) extends a plurality of second stirring rods (63).

3. The ultrafiltration membrane production feed preparation device according to claim 2, characterized in that, The inner cavities of the powder tank (1) and the reaction vessel (4) are both connected to a vacuum pump (11), and the top of the powder tank (1) and the liquid supply tank (3) are both provided with a feed inlet (16).

4. The ultrafiltration membrane production feed preparation device according to claim 3, characterized in that, Vacuum valves (13) are provided between the powder tank (1), the reaction vessel (4) and each of the vacuum pumps (11). Feed valves (12) are provided between the liquid storage tank (2), the powder tank (1) and the reaction vessel (4). Metering pumps (14) are provided between the liquid storage tank (2) and the liquid supply tank (3). Metering pumps (14), each of the feed valves (12) and each of the vacuum valves (13) are all connected to the control device.

5. The ultrafiltration membrane production feed preparation device according to claim 3, characterized in that, The first stirring rod (53) and the second stirring rod (63) are respectively arranged perpendicularly to the first driving rod (52) and the second driving rod (62), and the first stirring rod (53) and the second stirring rod (63) are evenly arranged along the extension direction of the first driving rod (52).

6. The ultrafiltration membrane production feed preparation device according to claim 5, characterized in that, The reactor (4) is equipped with an exhaust valve (15) at the top. The exhaust valve (15) is used to balance the pressure inside and outside the reactor (4) and to discharge harmful gases generated by the reaction.

7. The ultrafiltration membrane production feed preparation device according to claim 6, characterized in that, The reactor (4) is provided with a discharge pipe (17) at the end opposite to the exhaust valve (15), and the discharge pipe (17) is used to output the powder and the reaction liquid after the reaction.

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