Enhanced hollow fiber nanofiltration membrane
By setting up a multi-layer filter membrane structure and support mechanism in the hollow fiber nanofiltration membrane, the impurity damage caused by small membrane pore size in the prior art is solved, and a higher strength and a wider range of application are achieved.
Patent Information
- Application Number
- CN202420940692.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-04
- Publication Date
- 2024-12-24
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The membrane pore size of the existing reinforced hollow fiber nanofiltration membrane is small, and impurities can easily damage the membrane surface during filtration, resulting in a shortened service life.
A reinforced hollow fiber nanofiltration membrane was designed, including an external support mesh layer, an external prefilter layer, an external ultrafiltration membrane, a central nanofiltration membrane layer, an internal ultrafiltration membrane and an internal prefilter layer, through these hierarchies, from the inside and outside The hollow fiber nanofiltration membrane is supported on both sides, and support rods and reinforcement ribs are provided in the water flow to form a multi-layer filter membrane structure to pre-filter impurities to avoid direct contact with the central nanofiltration membrane layer.
It effectively increases the strength of the hollow fiber nanofiltration membrane, avoids impurities damaging the membrane surface during filtration, extends the service life, and is suitable for internal and external pressure filtration, expanding the scope of application.
Smart Images
Figure CN222219180U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hollow fiber membranes, in particular to an enhanced hollow fiber nanofiltration membrane. Background Art
[0002] Due to its unique structure and properties, the hollow fiber nanofiltration membrane has the largest effective membrane area per unit volume of the membrane assembly, so it has a higher filtration separation efficiency. The overall fiber-like structure has a certain self-supporting effect.
[0003] The patent specification with announcement number CN219663381U discloses an enhanced hollow fiber nanofiltration membrane, which relates to the technical field of hollow fiber nanofiltration membranes, including a hollow fiber nanofiltration membrane body, wherein the hollow fiber nanofiltration membrane body includes an internal support tube one, an internal support tube two is sleeved on the outer side of the internal support tube one, an elastic part is commonly arranged between the internal support tube one and the internal support tube two, and also includes a nanofiber base layer, which is prepared on the outer surface of the internal support tube two by an electrospinning method. The enhanced hollow fiber nanofiltration membrane can effectively buffer the pressure exerted by the liquid on the hollow fiber nanofiltration membrane body when the flow rate of the liquid in the hollow fiber nanofiltration membrane body is large, thereby enhancing the strength of the hollow fiber nanofiltration membrane body, avoiding the situation in which the hollow fiber nanofiltration membrane body is ruptured or broken during use and causing leakage, ensuring the normal use of the hollow fiber nanofiltration membrane body while also extending the service life of the hollow fiber nanofiltration membrane body.
[0004] However, in the implementation of relevant technologies, it was found that the above-designed enhanced hollow fiber nanofiltration membrane has the following problems: due to the small membrane pore size of the hollow fiber nanofiltration membrane, impurities during filtration can easily damage the surface of the hollow fiber nanofiltration membrane. In view of this, an enhanced hollow fiber nanofiltration membrane is provided to overcome the above-mentioned defects. Utility Model Content
[0005] The utility model aims to solve the shortcomings in the prior art and proposes an enhanced hollow fiber nanofiltration membrane.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an enhanced hollow fiber nanofiltration membrane, comprising an outer supporting mesh layer, the outer supporting mesh layer can play a supporting role on the outside of the hollow fiber nanofiltration membrane, the outer supporting mesh layer is provided with an outer pre-filtration layer inside, and the outer pre-filtration layer is provided with an outer ultrafiltration membrane inside, the outer ultrafiltration membrane is provided with a central nanofiltration membrane layer inside, and the central nanofiltration membrane layer is provided with an internal ultrafiltration membrane inside, the internal ultrafiltration membrane is provided with an internal pre-filtration layer inside, and the internal pre-filtration layer is provided with a central supporting tube inside, a support rod is provided between the central supporting tube and the internal pre-filtration layer, and the central supporting tube and the outer supporting mesh layer cooperate with each other to support the hollow fiber nanofiltration membrane from both inside and outside, effectively increase the strength of the hollow fiber nanofiltration membrane, and pre-filter the water flow passing through through the outer pre-filtration layer to avoid direct contact between impurities in the water and the central nanofiltration membrane layer, thereby avoiding damage to the surface of the hollow fiber nanofiltration membrane by impurities during filtration.
[0007] As a further description of the above technical solution: the support rod is fixed on the central support tube in a cross structure, and the central support tube and the support rod are integrally formed, and the central support tube and the support rod play a supporting role inside the hollow fiber nanofiltration membrane.
[0008] As a further description of the above technical solution: the internal pre-filter layer and the external pre-filter layer are both microporous filter membranes. The internal pre-filter layer and the external pre-filter layer can allow a large amount of water to pass through. The water flow can be pre-filtered first, and there is no need to use other pre-treatment filtration equipment for pre-filtration, thereby reducing the cost of use.
[0009] As a further description of the above technical solution: the external ultrafiltration membrane and the internal ultrafiltration membrane are both ultrafiltration membranes. The use of the external ultrafiltration membrane and the internal ultrafiltration membrane can cooperate with the central nanofiltration membrane layer to further protect the internal central nanofiltration membrane layer.
[0010] As a further description of the above technical solution: a plurality of reinforcing ribs are evenly and equidistantly distributed on the surface of the outer supporting mesh layer, and the reinforcing ribs can further improve the supporting effect of the outer supporting mesh layer.
[0011] As a further description of the above technical solution: the outer supporting mesh layer and the reinforcing ribs are both woven from nylon fibers, which have high strength, making the outer surface of the hollow fiber nanofiltration membrane more durable.
[0012] As a further description of the above technical solution: the pore sizes of the external pre-filtration layer, the external ultrafiltration membrane and the central nanofiltration membrane layer decrease successively, and the pore sizes of the central nanofiltration membrane layer, the internal ultrafiltration membrane and the internal pre-filtration layer increase successively. This is not only suitable for internal pressure filtration, but also for external pressure filtration, and has a wider range of applications.
[0013] The utility model has the following beneficial effects:
[0014] The utility model designs an enhanced hollow fiber nanofiltration membrane, which can not only support and protect the central nanofiltration membrane layer by sequentially arranging ultrafiltration membranes and pre-filtration layers on both sides of the central nanofiltration membrane layer, but also the external pre-filtration layer, the external ultrafiltration membrane, the internal ultrafiltration membrane and the internal pre-filtration layer can pre-filter the water flow to prevent impurities in the water from directly contacting the central nanofiltration membrane layer, thereby preventing impurities from damaging the surface of the hollow fiber nanofiltration membrane during filtration, and can simultaneously meet the requirements of internal pressure filtration and external pressure filtration, with a wider range of applications.
[0015] The utility model designs an enhanced hollow fiber nanofiltration membrane, which can support the hollow fiber nanofiltration membrane from both inside and outside by arranging support mechanisms on both inside and outside of the hollow fiber nanofiltration membrane. The central support tube and the outer support mesh layer cooperate with each other, so as to effectively increase the strength of the hollow fiber nanofiltration membrane. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;
[0017] Figure 2 This is a schematic diagram of the structure of the central support tube of the utility model;
[0018] Figure 3 This is a schematic diagram of the structure of the outer support mesh layer of the utility model;
[0019] Figure 4 for Figure 1 Enlarged view of point A in the middle.
[0020] Legend:
[0021] 1. External support mesh layer; 2. External pre-filtration layer; 3. External ultrafiltration membrane; 4. Nanofiltration membrane layer; 5. Internal ultrafiltration membrane; 6. Internal pre-filtration layer; 7. Support rod; 8. Central support tube; 9. Reinforcement ribs. DETAILED DESCRIPTION
[0022] Reference Figure 1-4The utility model provides an enhanced hollow fiber nanofiltration membrane: comprising an outer supporting mesh layer 1, the outer supporting mesh layer 1 can play a supporting role on the outside of the hollow fiber nanofiltration membrane, an outer pre-filter layer 2 is arranged inside the outer supporting mesh layer 1, and an outer ultrafiltration membrane 3 is arranged inside the outer pre-filter layer 2, a central nanofiltration membrane layer 4 is arranged inside the outer ultrafiltration membrane 3, and an internal ultrafiltration membrane 5 is arranged inside the central nanofiltration membrane layer 4, an internal pre-filter layer 6 is arranged inside the internal ultrafiltration membrane 5, and a central supporting tube 8 is arranged inside the internal pre-filter layer 6, a supporting rod 7 is arranged between the central supporting tube 8 and the internal pre-filter layer 6, the mutual cooperation between the central supporting tube 8 and the outer supporting mesh layer 1 can support the hollow fiber nanofiltration membrane from both inside and outside, effectively increase the strength of the hollow fiber nanofiltration membrane, and pre-filter the passing water flow through the outer pre-filter layer 2 and the inner pre-filter layer 6, so as to prevent impurities in the water from directly contacting the central nanofiltration membrane layer 4, thereby preventing impurities from damaging the surface of the hollow fiber nanofiltration membrane during filtration.
[0023] As a further implementation scheme of the above technical scheme: the support rod 7 is fixed on the central support tube 8 in a cross structure, and the central support tube 8 and the support rod 7 are integrally formed, and the central support tube 8 and the support rod 7 play a supporting role inside the hollow fiber nanofiltration membrane.
[0024] As a further implementation scheme of the above technical scheme: the internal pre-filter layer 6 and the external pre-filter layer 2 are both microporous filter membranes. The internal pre-filter layer 6 and the external pre-filter layer 2 can allow a large amount of water to pass through. The water flow can be pre-filtered first, and there is no need to use other pre-treatment filtration equipment for pre-filtration, thereby reducing the cost of use.
[0025] As a further implementation scheme of the above technical scheme: the external ultrafiltration membrane 3 and the internal ultrafiltration membrane 5 are both ultrafiltration membranes. The use of the external ultrafiltration membrane 3 and the internal ultrafiltration membrane 5 can cooperate with the central nanofiltration membrane layer 4 to further protect the internal central nanofiltration membrane layer 4.
[0026] As a further implementation scheme of the above technical scheme: a plurality of reinforcing ribs 9 are evenly and equidistantly distributed on the surface of the outer supporting mesh layer 1 , and the reinforcing ribs 9 can further enhance the supporting effect of the outer supporting mesh layer 1 .
[0027] As a further implementation scheme of the above technical scheme: the outer supporting mesh layer 1 and the reinforcing ribs 9 are both woven from nylon fibers. The nylon fibers have high strength, making the outer surface of the hollow fiber nanofiltration membrane more durable.
[0028] As a further implementation scheme of the above technical scheme: the pore sizes of the external pre-filtration layer 2, the external ultrafiltration membrane 3 and the central nanofiltration membrane layer 4 are reduced successively, and the pore sizes of the central nanofiltration membrane layer 4, the internal ultrafiltration membrane 5 and the internal pre-filtration layer 6 are increased successively. This is not only suitable for internal pressure filtration, but also for external pressure filtration, and has a wider range of applications.
[0029] In specific implementation, when water is filtered from the inside to the outside, it first passes through the central support tube 8 to enter the internal pre-filtration layer 6, the internal ultrafiltration membrane 5 and the central nanofiltration membrane layer 4 in sequence, first passes through the internal pre-filtration layer 6 for pre-filtration, then passes through the internal ultrafiltration membrane 5 for secondary filtration, and finally passes through the central nanofiltration membrane layer 4 for filtration before being discharged. When water is filtered from the outside to the inside, it first passes through the outer support mesh layer 1 to enter the external pre-filtration layer 2, the external ultrafiltration membrane 3 and the central nanofiltration membrane layer 4 in sequence, first passes through the external pre-filtration layer 2 for pre-filtration, then passes through the external ultrafiltration membrane 3 for secondary filtration, and finally passes through the central nanofiltration membrane layer 4 for filtration before being discharged. Since support mechanisms are provided on both the inner and outer sides of the hollow fiber nanofiltration membrane, the mutual cooperation of the central support tube 8 and the outer support mesh layer 1 can support the hollow fiber nanofiltration membrane from both the inside and the outside, thereby effectively increasing the strength of the hollow fiber nanofiltration membrane.
[0030] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An enhanced hollow fiber nanofiltration membrane, comprising an outer support mesh layer (1), characterized in that: An external pre-filter layer (2) is arranged inside the external support mesh layer (1), and an external ultrafiltration membrane (3) is arranged inside the external pre-filter layer (2), a central nanofiltration membrane layer (4) is arranged inside the external ultrafiltration membrane (3), and an internal ultrafiltration membrane (5) is arranged inside the central nanofiltration membrane layer (4), an internal pre-filter layer (6) is arranged inside the internal ultrafiltration membrane (5), and a central support tube (8) is arranged inside the internal pre-filter layer (6), and a support rod (7) is arranged between the central support tube (8) and the internal pre-filter layer (6).
2. The enhanced hollow fiber nanofiltration membrane according to claim 1, characterized in that: The support rod (7) is fixed on the central support tube (8) in a cross structure, and the central support tube (8) and the support rod (7) are integrally formed.
3. The enhanced hollow fiber nanofiltration membrane according to claim 1, characterized in that: The internal pre-filter layer (6) and the external pre-filter layer (2) are both microporous filter membranes.
4. The enhanced hollow fiber nanofiltration membrane according to claim 1, characterized in that: The external ultrafiltration membrane (3) and the internal ultrafiltration membrane (5) are both ultrafiltration membranes.
5. The enhanced hollow fiber nanofiltration membrane according to claim 1, characterized in that: A plurality of reinforcing ribs (9) are evenly distributed at equal intervals on the surface of the outer supporting mesh layer (1).
6. The enhanced hollow fiber nanofiltration membrane according to claim 5, characterized in that: The outer supporting mesh layer (1) and the reinforcing ribs (9) are both woven from nylon fibers.
7. The enhanced hollow fiber nanofiltration membrane according to claim 1, characterized in that: The pore sizes of the external pre-filtration layer (2), the external ultrafiltration membrane (3) and the central nanofiltration membrane layer (4) decrease in sequence, while the pore sizes of the central nanofiltration membrane layer (4), the internal ultrafiltration membrane (5) and the internal pre-filtration layer (6) increase in sequence.