Coagulating bath tank for hollow fiber membrane production

Abstract

The utility model provides a coagulating bath tank for producing a hollow fiber membrane. The coagulating bath tank comprises a bath tank body, a godet wheel group and a partition plate assembly, the godet wheel set comprises a fixed godet wheel and a movable godet wheel, the fixed godet wheel is fixed to the bottom of an inner cavity of the bath body, and the movable godet wheel is slidably connected to the top of the bath body. A plurality of isolation cavities are formed between the partition plate assemblies and the inner cavity wall of the bath body and between every two adjacent partition plate assemblies; according to the coagulating bath, the bath body is divided into a plurality of isolation chambers through the partition plate assemblies, after primary membrane filaments enter the bath body, the membrane filaments are guided to move in the inner cavity of the bath body through the fixed filament guide wheel, the membrane filaments are guided to discharge water through the movable filament guide wheel, and the retention time of a hollow fiber membrane in the coagulating bath is adjusted. The internal space of the bath body can be freely separated by adjusting the partition plate assembly during use, the composition of the coagulating bath can be freely changed or aqueous solutions in different spaces can be independently replaced, the use efficiency of the solutions can be effectively improved, and waste is reduced.

Description

Technical Field

[0001] The present application relates to the field of hollow fiber membrane production, and in particular to a coagulation bath for hollow fiber membrane production. Background Art

[0002] Separation membrane technology is a new, green, and efficient separation technology widely used in industry, daily life, medicine, and other fields. Hollow fiber membranes, a major form of separation membrane, have attracted widespread attention due to their high efficiency, energy saving, large specific surface area, and self-supporting properties. Two common methods for preparing hollow fiber membranes are TIPS and NIPS. In both methods, the polymer is squeezed through a spinneret into a coagulation bath for solidification and formation. The membrane fibers are then collected by a winding device for subsequent processing.

[0003] Currently, existing coagulation baths are all integrated rectangular water tanks. After long-term use, the coagulation bath is prone to uneven concentration, resulting in unstable performance of the prepared hollow fiber membrane. Furthermore, changing the coagulation bath requires replacing the entire water in the coagulation bath, which makes it difficult to effectively utilize water resources and easily leads to significant waste. Furthermore, the current coagulation bath structure is relatively rigid, and the time the hollow fiber membrane stays in the coagulation bath is mainly controlled by the back-end drafting rate, resulting in a relatively simple route for the hollow fiber membrane in the coagulation bath. Utility Model Content

[0004] The present application aims to solve the problems that the existing coagulation baths are all integrated rectangular water tanks, and uneven concentrations are likely to occur in various parts of the coagulation bath after long-term use. At the same time, the replacement of the coagulation bath requires the complete replacement of the water in the entire coagulation bath. A coagulation bath for hollow fiber membrane production is provided, including: a bath body, a guide wire wheel assembly, and a partition assembly.

[0005] The guide wheel assembly includes a fixed guide wheel and a movable guide wheel, wherein the fixed guide wheels are fixed at equal intervals at the bottom of the inner cavity of the bath body, and the movable guide wheel is slidably connected to the top of the bath body;

[0006] There are multiple partition assemblies, which are respectively arranged between the two fixed wire guide wheels, and the two ends of the partition assemblies are in contact with the inner cavity wall of the bath body;

[0007] A plurality of isolation chambers are formed between the partition assembly and the inner cavity wall of the bath body, and between two adjacent partition assemblies;

[0008] The partition assembly includes a card slot and a partition. The card slot is fixedly connected to the bottom of the inner cavity of the bath body. The partition is detachably connected to the card slot.

[0009] In a feasible implementation, at least one of the plurality of fixed guide wheels is located directly below the primary membrane yarn outlet.

[0010] In a feasible implementation, a slide rail is provided on the top of the bath body along the length direction of the bath body, and the movable wire guide wheel is slidably connected to the slide rail.

[0011] In a feasible implementation, it further includes a water inlet and a plurality of water outlets, wherein the water inlet is provided on the outside of the bath body near one end of the primary membrane filament outlet, and the water inlet is communicated with the inner cavity of the bath body;

[0012] The water outlet is arranged at the bottom of the bath body, and is communicated with the isolation chamber, and each isolation chamber is communicated with at least one water outlet.

[0013] In a feasible implementation, it further includes a cover plate;

[0014] The cover plate is arranged on the top of the bath body, and the cover plate covers the movable wire guide wheel; an edge of the cover plate is rotatably connected to an edge of the top of the bath body through a hinge.

[0015] In a feasible implementation, the cover plate is made of a transparent material.

[0016] In a feasible implementation, it also includes a wire collecting guide wheel, which is fixed on the top of the bath body on a side away from the primary membrane yarn outlet.

[0017] In one possible implementation, a liquid level monitor is also included:

[0018] The liquid level monitor includes a liquid level sensor and a signal light. The liquid level sensor is electrically connected to the signal light. The liquid level sensor is arranged in each of the isolation chambers. The liquid level sensor is used to monitor the bath liquid level in real time. When the liquid level sensor detects that the liquid level is lower than a preset threshold, the signal light flashes.

[0019] The present application provides a coagulation bath for hollow fiber membrane production, comprising: a bath body, a guide wheel assembly, and a partition assembly. The present application divides the bath body into a plurality of isolated chambers through the partition assembly, waits for the nascent membrane filaments to enter the bath body, guides the membrane filaments to move in the inner cavity of the bath body through a fixed guide wheel, and guides the membrane filaments out of water through a movable guide wheel. By adjusting the partition assembly, the internal space of the bath body can be freely divided during use, the composition of the coagulation bath can be freely changed, or the aqueous solutions in different spaces can be replaced separately, which can effectively improve the efficiency of solution use and reduce waste. The residence time of the hollow fiber membrane in the coagulation bath can be flexibly adjusted by moving the guide wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the implementation of the present invention, and together with the specification, are used to explain the principles of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the implementation of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work.

[0021] Figure 1 1 is a schematic structural diagram of a coagulation bath for producing hollow fiber membranes, shown in an exemplary embodiment of the present application;

[0022] Figure 2 yes Figure 1 Attached view.

[0023] Description of the accompanying drawings:

[0024] 100-bath body; 200-wire guide wheel assembly; 300-partition assembly; 400-slide rail; 500-water outlet; 600-water inlet; 700-wire collection wire guide wheel; 110-isolation chamber; 210-fixed wire guide wheel; 220-movable wire guide wheel; 310-cage; 320-partition. DETAILED DESCRIPTION

[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present invention will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a full understanding of the implementation of the embodiments of the present invention.

[0026] The two common preparation methods for hollow fiber membranes are TIPS and NIPS. In both methods, the polymer needs to be squeezed into the coagulation bath through a spinneret to solidify and form, and then the membrane fibers are collected by a winding device for subsequent processing. Currently, the existing coagulation baths are all one-piece rectangular water tanks. After long-term use, uneven concentrations are likely to occur in various parts of the coagulation bath, resulting in unstable performance of the prepared hollow fiber membranes. At the same time, the replacement of the coagulation bath requires the complete replacement of all water in the coagulation bath, which cannot make good use of water resources and is likely to cause large waste. In addition, the current coagulation bath structure is relatively solidified, and the time the hollow fiber membrane stays in the coagulation bath is mainly controlled by the stretching rate at the rear end. The route of the hollow fiber membrane in the coagulation bath is relatively simple.

[0027] In order to solve the above problems, the present invention provides a coagulation bath for producing hollow fiber membranes. Figure 1 As shown, it includes: a bath body 100, a wire guide wheel assembly 200, and a partition assembly 300.

[0028] The bath body 100 provides a closed and stable chemical environment for the critical step of the hollow fiber membrane coagulation process. It is typically constructed from corrosion-resistant and high-temperature-resistant polymer materials to ensure long-term durability and chemical stability. The design of the bath body 100 also requires ease of cleaning and maintenance, allowing for regular removal of residual chemicals to maintain a hygienic production environment.

[0029] The guide wheel assembly 200 includes a fixed guide wheel 210 and a movable guide wheel 220 . The fixed guide wheels 210 are fixed at equal intervals on the bottom of the inner cavity of the bath body 100 , and the movable guide wheel 220 is slidably connected to the top of the bath body 100 .

[0030] The guide wheel assembly 200 consists of a fixed guide wheel 210 and a movable guide wheel 220, which can accurately control and guide the travel path of the membrane filament in the coagulation bath, ensuring that the membrane filament can pass through the coagulation liquid evenly and continuously, thereby avoiding quality problems such as fiber twisting and breakage.

[0031] Among them, the fixed wire guide wheel provides stable support and guidance for the membrane wire, ensuring the straightness of the membrane wire during the solidification process.

[0032] The movable guide wheel 220 can adjust its position according to production requirements to adapt to the production of membrane yarns of different specifications or lengths, thereby increasing the flexibility and applicability of the equipment and effectively regulating the time the membrane yarns stay in the coagulation bath.

[0033] There are multiple partition assemblies 300, which are respectively arranged between the two fixed wire guide wheels 210, and the two ends of the partition assemblies 300 are in contact with the inner cavity wall of the bath body 100; multiple isolation chambers 110 are formed between the partition assemblies 300 and the inner cavity wall of the bath body 100, and between two adjacent partition assemblies 300; the partition assembly 300 includes: a slot 310 and a partition 320, the slot 310 is fixedly connected to the bottom of the inner cavity of the bath body 100, and the partition 320 is detachably connected to the slot 310.

[0034] The partition assembly 300 achieves fine zoning management of the coagulation bath by creating multiple independent isolation chambers 110, effectively solving the problems of uneven coagulation liquid concentration and large temperature fluctuations in a traditional single bath.

[0035] The card slot 310 serves as the installation base of the partition 320. Its design facilitates quick installation and removal, and facilitates adjustment of the number and layout of the isolation chambers according to production requirements.

[0036] The partition 320 is detachably connected to the slot 310, allowing the membrane filament's path length in the coagulation bath to be adjusted based on production batches or coagulation conditions. Furthermore, the partition material, height, and other parameters can be easily replaced or adjusted to further optimize the coagulation effect. The partition material must possess excellent chemical stability and sealing properties to prevent cross-penetration of the coagulation solution.

[0037] The coagulation bath for hollow fiber membrane production provided in the embodiment of the present application reduces waste and failure rate in the production process by precisely controlling the travel path and coagulation conditions of the membrane filaments, thereby significantly improving production efficiency. The independent isolation chamber 110 ensures the uniformity and stability of the coagulation liquid, effectively avoiding fiber membrane quality problems caused by uneven concentration or temperature fluctuations. Furthermore, the design of the movable guide wheel 220 and the detachable partition assembly 300 enables the coagulation bath to adapt to the production of hollow fiber membranes of various specifications and materials, thereby improving the versatility and flexibility of the equipment.

[0038] In some embodiments of this application, continue to refer to Figure 1 As shown, at least one of the multiple fixed guide wheels 210 is located directly below the outlet of the primary membrane yarn.

[0039] It is understandable that at the moment when the nascent membrane filaments are extruded from the spinning head and enter the coagulation bath, their morphology is extremely unstable and easily disturbed by external factors. Therefore, one or more fixed guide wheels 210 are provided directly below the outlet of the nascent membrane filaments to play a supporting and guiding role. After leaving the spinning head, the nascent membrane filaments are immediately supported by the fixed guide wheel 210 below, which effectively prevents sagging or twisting due to gravity or air resistance, and ensures the straightness and continuity of the membrane filaments. The precise positioning of the fixed guide wheel 210 enables the nascent membrane filaments to smoothly transition from the spinning area to the coagulation bath, reducing the changes in the membrane filament structure caused by sudden environmental changes (such as temperature, pressure, etc.), thereby maintaining the consistency of the physical and chemical properties of the membrane filaments.

[0040] In some embodiments of the present application, reference Figure 2 As shown, a slide rail 400 is provided on the top of the bath body 100 along the length direction of the bath body 100 , and the movable wire guide wheel 220 is slidably connected to the slide rail 400 .

[0041] The combination of slide rail 400 and movable guide wheel 220 allows the latter to be easily adjusted as needed to accommodate the production of hollow fiber membranes of varying specifications, lengths, or production speeds. This flexibility not only increases the versatility of the equipment but also reduces adjustment costs and time during the production process. Precise membrane filament guidance and a stable coagulation environment contribute to the quality control of the final product. By optimizing the coagulation process, quality issues such as membrane filament distortion and breakage can be reduced, improving the overall quality and reliability of the product.

[0042] In some embodiments of the present application, the coagulation bath for hollow fiber membrane production also includes a water inlet 600 and several water outlets 500. The water inlet 600 is arranged at one end of the outside of the bath body 100 close to the outlet of the primary membrane filaments, and the water inlet 600 is connected to the inner cavity of the bath body 100; the water outlet 500 is arranged at the bottom of the bath body 100, and the water outlet 500 is connected to the isolation chamber 110, and each isolation chamber 110 is connected to at least one water outlet 500.

[0043] Specifically, the water inlet 600 is connected to the inner cavity of the bath body 100, ensuring a stable supply and uniform distribution of the coagulation liquid. Each isolation chamber 110 is equipped with at least one water outlet 500, ensuring the effective circulation and renewal of the coagulation liquid in the bath. By dispersing the number and position of the water outlets 500, the flow efficiency and utilization rate of the coagulation liquid can be maximized, while avoiding the generation of dead corners and ensuring the uniformity and stability of the coagulation process. The provision of the water outlet 500 helps to reduce the waste and discharge of the coagulation liquid. At the same time, the precise control of the water inlet 600 also ensures the full utilization of the coagulation liquid, thereby reducing production costs and environmental impact.

[0044] In some embodiments of the present application, a cover plate is further included; the cover plate is disposed on the top of the bath body 100 and covers the movable godet 220; an edge of the cover plate is rotatably connected to an edge of the top of the bath body 100 via a hinge. In some embodiments of the present application, the cover plate is made of a transparent material.

[0045] The cover's structural design not only protects the moving godet from external interference, such as dust and moisture, but also ensures the continuity and stability of the production process. The cover effectively prevents external impurities from entering the bath, avoiding production failures and quality issues caused by contamination. The cover is made of a transparent material, such as glass or clear plastic. This design allows production personnel to visually observe the production status within the bath, including the movement of the membrane filaments and the state of the coagulation liquid, without having to open the cover. This allows potential problems to be identified and addressed promptly, ensuring smooth production.

[0046] Secondly, the cover's hinged, rotating connection design not only facilitates operation but also ensures stability when closed, preventing accidents caused by accidental opening. Furthermore, the use of transparent materials allows production personnel to observe and operate the equipment without touching it, further reducing safety risks. By observing the production process in real time, production personnel can promptly identify and address potential problems, avoiding production interruptions caused by downtime due to faults. Furthermore, the cover's convenient opening and closing function facilitates rapid maintenance and adjustments of the equipment, thereby improving overall production efficiency.

[0047] In some embodiments of the present application, a wire collecting guide wheel 700 is further included, and the wire collecting guide wheel 700 is fixed on the top of the bath body 100 on a side away from the primary membrane yarn outlet.

[0048] The wire-collecting guide wheel 700 allows the membrane filaments to smoothly enter the subsequent wire-collecting or drying stage after being treated in the coagulation bath, thereby improving the entire production process, improving the continuity and stability of the production line, and reducing the production failure rate caused by membrane filament breakage or entanglement.

[0049] In this embodiment of the present application, by optimizing the layout and parameters of the take-up godet 700, friction and resistance of the film filaments as they leave the bath can be significantly reduced, thereby accelerating their movement and improving production efficiency. Furthermore, the stability of the take-up godet ensures the filaments' shape stability and continuity as they leave the bath, reducing rework due to quality issues.

[0050] In some embodiments of the present application, a liquid level monitor is also included: the liquid level monitor includes a liquid level sensor and an alarm, the liquid level sensor is electrically connected to the alarm, the liquid level sensor is arranged in each isolation chamber 110, and the liquid level sensor is used to monitor the bath liquid level in real time. When the liquid level sensor detects that the liquid level is lower than a preset threshold, the alarm sounds an alarm.

[0051] The addition of a liquid level monitor enables automated and remote monitoring of the liquid level of the coagulation bath. Production personnel no longer need to frequently visit the site to check the liquid level. Instead, they can monitor the bath liquid status in each isolation chamber in real time through the monitoring screen, thereby improving production efficiency and convenience. The coordinated operation of the liquid level sensor and alarm ensures safety during the production process. When the bath liquid level falls below the preset threshold, the alarm will immediately sound an alarm, reminding production personnel to take timely measures. This design not only avoids production interruptions caused by insufficient bath liquid, but also reduces safety hazards that may be caused by low liquid levels. The accuracy and real-time performance of the liquid level monitor ensure that the bath liquid in each isolation chamber is always kept within the appropriate range.

[0052] When using the coagulation bath for hollow fiber membrane production of the present application, first, according to the composition of the desired coagulation bath and the time the membrane filaments need to stay in the coagulation bath, partitions are freely installed to separate the internal space of the coagulation bath body, and the movable guide wheel on the slide rail is moved to the correct position and fixed to control the time the membrane filaments stay in the coagulation bath. Wait for the newly born membrane filaments to enter the inner cavity of the bath body, guide the membrane filaments to move in the inner cavity of the bath body through the fixed guide wheel, guide the membrane filaments to exit the water through the movable guide wheel, and enter the subsequent collection process through the collection guide wheel at the top of the rear end of the coagulation bath.

[0053] The coagulation bath for hollow fiber membrane production of the present application can flexibly change the composition of the coagulation bath in the coagulation bath by freely removing the partitions in the coagulation bath. The slide rails on the top of the coagulation bath can help the upper wire guide wheel to move freely or change the number of wire guide wheels, further refining the residence time of the hollow fiber membrane in the coagulation bath. Independent water outlets are installed under the space between the bottom of the coagulation bath, which can replace the solution in the coagulation bath in a targeted manner, reducing solvent waste and improving utilization efficiency. The transparent cover on the top can help R&D personnel observe the spinning situation more intuitively.

[0054] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the disclosure of the specification and examples. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in this disclosure.

Claims

1. A coagulation bath for producing hollow fiber membranes, characterized in that: include: Bath body (100), wire guide wheel assembly (200), partition assembly (300); The guide wheel assembly (200) comprises a fixed guide wheel (210) and a movable guide wheel (220), wherein the fixed guide wheels (210) are fixed at equal intervals on the bottom of the inner cavity of the bath body (100), and the movable guide wheel (220) is slidably connected to the top of the bath body (100); There are multiple partition assemblies (300), which are respectively arranged between the two fixed wire guide wheels (210), and both ends of the partition assemblies (300) are in contact with the inner cavity wall of the bath body (100); A plurality of isolation chambers (110) are formed between the partition assembly (300) and the inner wall of the bath body (100), and between two adjacent partition assemblies (300); The partition assembly (300) comprises a card slot (310) and a partition (320), wherein the card slot (310) is fixedly connected to the bottom of the inner cavity of the bath body (100), and the partition (320) is detachably connected to the card slot (310).

2. A coagulation bath for hollow fiber membrane production according to claim 1, characterized in that: At least one of the plurality of fixed guide wheels (210) is arranged directly below the primary membrane yarn outlet.

3. A coagulation bath for producing hollow fiber membranes according to claim 1, characterized in that: A slide rail (400) is provided at the top of the bath body (100) along the length direction of the bath body (100), and the movable wire guide wheel (220) is slidably connected to the slide rail (400).

4. A coagulation bath for producing hollow fiber membranes according to claim 2, characterized in that: It also includes a water inlet (600) and a plurality of water outlets (500), wherein the water inlet (600) is arranged outside the bath body (100) near one end of the primary membrane filament outlet, and the water inlet (600) is communicated with the inner cavity of the bath body (100); The water outlet (500) is provided at the bottom of the bath body (100), the water outlet (500) is communicated with the isolation chamber (110), and each isolation chamber (110) is communicated with at least one water outlet (500).

5. The coagulation bath for producing hollow fiber membranes according to claim 1, characterized in that: Also includes cover plate; The cover plate is arranged on the top of the bath body (100), and the cover plate covers the top of the movable wire guide wheel (220); an edge of the cover plate is rotatably connected to an edge of the top of the bath body (100) through a hinge.

6. A coagulation bath for producing hollow fiber membranes according to claim 5, characterized in that: The cover plate is made of transparent material.

7. A coagulation bath for producing hollow fiber membranes according to claim 2, characterized in that: It also includes a wire collecting guide wheel (700), which is fixed on the top of the bath body (100) on a side away from the primary membrane yarn outlet.

8. The coagulation bath for producing hollow fiber membranes according to claim 1, characterized in that: Also includes level monitor: The liquid level monitor comprises a liquid level sensor and an alarm, wherein the liquid level sensor is electrically connected to the alarm, and the liquid level sensor is arranged in each of the isolation chambers (110). The liquid level sensor is used to monitor the bath liquid level in real time, and when the liquid level sensor detects that the liquid level is lower than a preset threshold, the alarm sounds an alarm.

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