Membrane performance evaluation testing device and testing method thereof

Abstract

The invention provides a membrane performance evaluation testing device and a testing method thereof, the membrane performance evaluation testing device comprises a fluid supply assembly for testing and a membrane testing clamp, and the membrane testing clamp is connected with the fluid supply assembly for testing through a pipeline; the membrane test fixture comprises an upper fixture and a lower fixture, the upper fixture and the lower fixture are detachably connected through screws, a membrane is detachably arranged between the upper fixture and the lower fixture, a sealing ring for preventing liquid and gas leakage of the membrane test fixture is arranged at the joint of the upper fixture and the lower fixture, and an exhaust valve is arranged on the upper fixture or the lower fixture. The exhaust valve is used for exhausting air in the membrane test fixture, a flow channel for fluid circulation is formed in the membrane test fixture, a fluid collector is arranged at an outlet of the flow channel, and the fluid collector is used for measuring the fluid flowing out of the outlet of the flow channel. According to the membrane performance evaluation testing device and the testing method thereof provided by the invention, different fluids enter the membrane testing clamp, so that the device can test the material characteristics of a hydrophilic membrane or a hydrophobic membrane.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm testing, and particularly to a membrane performance evaluation testing device and a testing method thereof. Background Art

[0002] In the field of membrane separation technology, separation membranes have been widely used in diverse scenarios such as sewage treatment, seawater desalination, food processing, and medical pharmaceutical due to their diverse types, low energy consumption, and high efficiency. For example, in the field of seawater desalination, its related industries have become an important pillar of China's marine economy; in the food processing industry, through the combination of technologies such as reverse osmosis and nanofiltration, membrane separation can meet the core needs of separation, concentration, and purification in beverage processing; while in the medical field, although membrane technology plays a key role in scenarios such as hemodialysis and drug preparation, new medical membrane materials still rely heavily on imports, and there is a significant gap between related research and the international advanced level.

[0003] In the research and development and practical application of separation membranes, performance indicators such as water flux and standard substance rejection rate are core parameters for measuring the maturity of membrane technology. Therefore, it is crucial to construct an efficient and accurate membrane performance testing system. However, existing membrane performance testing devices generally have functional limitations: most devices can only detect the performance of a single type of hydrophilic or hydrophobic membrane, lacking the multi-functional testing ability to be compatible with the characteristics of different membrane materials, resulting in the need to frequently replace equipment during the research and development process, which not only increases the testing cost but also reduces the research and development efficiency. In addition, there is still room for improvement in aspects such as the automation of the testing process and the accuracy of data acquisition in existing devices, making it difficult to meet the requirements of high-throughput and high-precision testing for the research and development of new membrane materials. Summary of the Invention

[0004] Embodiments of the present invention provide a membrane performance evaluation testing device and a testing method thereof to solve the problem in the prior art that only the performance of a single type of hydrophilic or hydrophobic membrane can be detected.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions: A membrane performance evaluation testing device includes a test fluid supply component and a membrane test fixture. The membrane test fixture is connected to the test fluid supply component through a pipeline. The test fluid supply component is used to provide the fluid required for testing the membrane performance and discharge it into the membrane test fixture through the pipeline.

[0006] The membrane test fixture includes an upper fixture and a lower fixture. The upper fixture and the lower fixture are detachably connected by screws. A diaphragm is detachably arranged between the upper fixture and the lower fixture. A sealing ring for preventing liquid leakage and air leakage of the membrane test fixture is arranged at the connection of the upper fixture and the lower fixture. An exhaust valve is arranged on the upper fixture or the lower fixture. The exhaust valve is used to discharge the air in the membrane test fixture. A flow channel for fluid circulation is formed in the membrane test fixture, and the fluid in the flow channel will pass through the diaphragm through the flow channel. The inlet of the flow channel is connected to the test fluid supply component through a pipeline, and the outlet of the flow channel communicates with the outside. A fluid collector is arranged at the outlet of the flow channel. The fluid collector is used to measure the fluid flowing out of the outlet of the flow channel.

[0007] Further, a valve for controlling the opening and closing of the pipeline is arranged on the pipeline between the test fluid supply component and the membrane test fixture.

[0008] Further, the membrane test fixture further includes a first pressure gauge, and the first pressure gauge is arranged at the outlet of the flow channel.

[0009] Further, a second pressure gauge is arranged at the inlet of the flow channel, and the second pressure gauge is used to detect the fluid pressure entering the membrane test fixture.

[0010] Further, the inlet of the flow channel is arranged on the upper fixture, and the outlet of the flow channel is arranged on the lower fixture.

[0011] In one embodiment, the test fluid supply component includes a liquid storage plate and a gear pump. The liquid storage plate and the membrane test fixture are connected through a pipeline, and the gear pump is arranged on the pipeline between the liquid storage plate and the membrane test fixture;

[0012] The liquid storage plate includes a base, and a detachable water tank is arranged in the base. The water tank is used to carry the liquid.

[0013] The fluid collector is a material bottle, and the material bottle is used to measure the liquid flowing out of the outlet of the flow channel.

[0014] Further, a magnetic stirrer is arranged in the water tank.

[0015] Further, a heating rod and a cold trap are arranged in the water tank.

[0016] In one embodiment, the test fluid supply component is a gas supply device, and the gas supply device is used to drive gas to enter the membrane test fixture through a pipeline;

[0017] The fluid collector is a gas flow meter that can measure the volume of the flowing out gas.

[0018] A method for testing membrane performance, using the aforementioned membrane performance evaluation test device, has the following operating steps:

[0019] S1. Cut the diaphragm well, place it on the lower fixture, place the sealing ring on the lower fixture, make the diaphragm located inside the lower fixture, cover the upper fixture, and tighten the screws to ensure that the membrane test fixture will not leak outwards.

[0020] S2. Prepare the fluid required for testing the membrane performance through the test fluid supply component.

[0021] S3. Drain all the air inside the membrane test fixture through the exhaust valve, and pass the fluid into the membrane test fixture through the inlet of the pipeline and the flow channel by the test fluid supply component. After the fluid passes through the diaphragm, it discharges from the outlet of the flow channel out of the membrane test fixture, and record the data of the discharged fluid. Calculate the relevant performance of the diaphragm through the difference between the inflowing fluid data and the outflowing fluid data.

[0022] S4. After the test is completed, save the data and turn off the power supply.

[0023] The beneficial effects of the present invention are as follows:

[0024] The membrane performance evaluation test device and its test method provided by the present invention, through the provided test fluid supply component, enable different fluids to enter the membrane test fixture, so that the device can test the material characteristics of hydrophilic diaphragms or hydrophobic diaphragms. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of the membrane performance evaluation test device provided in Embodiment 2;

[0026] Figure 2 It is a schematic structural diagram of the feed liquid storage plate provided in Embodiment 1;

[0027] Figure 3 It is a schematic structural diagram of the membrane test fixture provided in Embodiment 1;

[0028] Figure 4 It is a schematic structural diagram of the membrane performance evaluation test device provided in Embodiment 3.

[0029] Description of the Reference Numerals:

[0030] 1. Feed liquid storage plate; 11. Base; 12. Water tank; 2. Gear pump; 3. Membrane test fixture; 31. Upper fixture; 32. Lower fixture; 33. Diaphragm; 34. Sealing ring; 35. Exhaust valve; 36. Flow channel; 37. Fluid collector; 38. First pressure gauge; 4. Second pressure gauge; 5. Valve; 6. Gas supply equipment. Detailed Embodiments

[0031] The following will describe in detail the specific embodiments of the present application with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present application, and are not used to limit the present application.

[0032] Example 1:

[0033] An embodiment of the present invention provides a membrane performance evaluation test device, including a test fluid supply assembly and a membrane test fixture 3. The membrane test fixture 3 is connected to the test fluid supply assembly through a pipeline. The test fluid supply assembly is used to provide the fluid required for testing the membrane performance and discharge it into the membrane test fixture 3 through the pipeline.

[0034] The membrane test fixture 3 includes an upper fixture 31 and a lower fixture 32. The upper fixture 31 and the lower fixture 32 are detachably connected by screws. A membrane sheet 33 is detachably arranged between the upper fixture 31 and the lower fixture 32. A sealing ring 34 for preventing the membrane test fixture 3 from leaking liquid and gas is arranged at the connection of the upper fixture 31 and the lower fixture 32. An exhaust valve 35 is arranged on the upper fixture 31 or the lower fixture 32. The exhaust valve 35 is used to discharge the air in the membrane test fixture 3. A flow channel 36 for fluid circulation is formed in the membrane test fixture 3, and the fluid in the flow channel 36 will pass through the membrane sheet 33 through the flow channel 36 (it can be foreseen that the inlet of the flow channel 36 can be arranged on the upper fixture 31, the outlet of the flow channel 36 is arranged on the lower fixture 32, or both the inlet and outlet of the flow channel 36 are arranged on the upper fixture 31, or both the inlet and outlet of the flow channel 36 are arranged on the lower fixture 32. As long as the flow channel 36 passes through the membrane sheet 33, the purpose of testing the performance of the membrane sheet can be achieved). The inlet of the flow channel 36 is connected to the test fluid supply assembly through a pipeline, and the outlet of the flow channel 36 communicates with the outside, so that the fluid is discharged from the membrane test fixture 3 through the outlet. A fluid collector 37 is arranged at the outlet of the flow channel 36. The fluid collector 37 is used to measure the fluid flowing out of the outlet of the flow channel 36.

[0035] In order to facilitate controlling the fluid circulation or stop circulation in the pipeline between the test fluid supply assembly and the membrane test fixture 3, in a preferred embodiment of the present invention, a valve 5 for controlling the opening and closing of the pipeline is arranged on the pipeline between the test fluid supply assembly and the membrane test fixture 3.

[0036] In order to be able to test the fluid pressure discharged from the membrane test fixture 3, in a preferred embodiment of the present invention, the membrane test fixture 3 further includes a first pressure gauge 38, and the first pressure gauge 38 is arranged at the outlet of the flow channel 36.

[0037] In order to be able to test the fluid pressure entering the membrane test fixture 3, in a preferred embodiment of the present invention, a second pressure gauge 4 is provided at the inlet of the flow channel 36, and the second pressure gauge 4 is used to detect the fluid pressure entering the membrane test fixture 3; to prevent the fluid pressure entering the membrane test fixture 3 from being too large and damaging the diaphragm 33, in a preferred embodiment of the present invention, before the diaphragm 33 is placed in the membrane test fixture 3, the fluid pressure entering the membrane test fixture 3 is tested through the second pressure gauge 4. When the pressure at the inlet of the flow channel 36 is 0.1 MPa - 0.5 MPa, the diaphragm 33 is placed in the membrane test fixture 3.

[0038] To facilitate the discharge of the feed liquid from the membrane test fixture 3 through the flow channel 36, as a preferred embodiment of the present invention, the inlet of the flow channel 36 is provided on the upper fixture 31, and the outlet of the flow channel 36 is provided on the lower fixture 32.

[0039] The embodiment of the present invention provides a test method for testing the performance of a diaphragm through a membrane performance evaluation test device, which specifically includes the following steps:

[0040] S1. Cut the diaphragm 33 well, place it on the lower fixture 32, place the sealing ring 34 on the lower fixture 32, make the diaphragm 33 located inside the lower fixture 32, cover the upper fixture 31, and tighten the screws to ensure that the membrane test fixture does not leak outward;

[0041] S2. Prepare the fluid required for testing the membrane performance through the test fluid supply component;

[0042] S3. Drain all the air in the membrane test fixture 3 through the exhaust valve 35, and pass the fluid into the membrane test fixture 3 through the inlet of the pipeline and the flow channel 36 through the test fluid supply component. After the fluid passes through the diaphragm 33, it discharges from the outlet of the flow channel 36 out of the membrane test fixture 3, and record the data of the discharged fluid. Calculate the relevant performance of the diaphragm 33 through the difference between the inflow fluid data and the outflow fluid data;

[0043] S4. After the test is completed, save the data and turn off the power supply.

[0044] Embodiment Two:

[0045] On the basis of Embodiment One, in order to test the permeability of hydrophilic membranes such as PES membranes and PVDF membranes, in this embodiment, as Figures 1-3 shown, the test fluid supply component includes a feed liquid storage plate 1 and a gear pump 2. The feed liquid storage plate 1 and the membrane test fixture 3 are connected through a pipeline, and the gear pump 2 is arranged on the pipeline between the feed liquid storage plate 1 and the membrane test fixture 3;

[0046] The feed liquid storage plate 1 includes a base 11, and a detachable water tank 12 is arranged inside the base 11. The water tank 12 is used to carry the feed liquid;

[0047] The fluid collector 37 is a material storage bottle, and the material storage bottle is used to measure the liquid flowing out from the outlet of the flow channel 36.

[0048] In order to prevent the uneven mixing of the material liquid in the water tank 12, in a preferred embodiment of the present invention, a magnetic stirrer is provided in the water tank 12.

[0049] In order to control the temperature of the material liquid in the water tank 12 to meet different test requirements, in a preferred embodiment of the present invention, a heating rod and a cold trap are provided in the water tank 12; in order to facilitate the observation of the temperature of the material liquid in the water tank 12, in a preferred embodiment of the present invention, a temperature sensor is provided in the water tank 12; in order to enable the staff to more conveniently control the temperature of the material liquid in the water tank, in a preferred embodiment of the present invention, the material liquid storage plate 1 further includes a temperature control device, and the temperature control device is electrically connected to the temperature sensor, the heating rod and the cold trap respectively.

[0050] Embodiment Three:

[0051] On the basis of Embodiment One, in order to test the permeability of hydrophobic membranes such as polytetrafluoroethylene membranes, in this embodiment, as Figure 4 shown, the test fluid supply assembly is a gas supply device 6 (the gas supply device 6 can specifically be a nitrogen machine, an air pump or an air compressor), and the gas supply device 6 is used to drive gas to enter the membrane test fixture 3 through a pipeline;

[0052] The fluid collector 37 is a gas flowmeter that can measure the volume of the outflowing gas (the gas flowmeter can specifically be a soap bubble meter and a soap film flowmeter), and the gas flows through the outlet to the gas flowmeter 37, so as to test the permeability of the hydrophobic membrane through the ratio of the inlet and outlet volumes.

[0053] The membrane performance evaluation test device and its test method provided by the present invention enable different fluids to enter the membrane test fixture 3 through the provided test fluid supply assembly, so that the device can test the material properties of hydrophilic membrane sheets or hydrophobic membrane sheets.

[0054] The above embodiments only represent the implementation manners of the present invention, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A membrane performance evaluation test device, characterized in that, It includes a test fluid supply component and a membrane test fixture (3). The membrane test fixture (3) is connected to the test fluid supply component through a pipeline. The test fluid supply component is used to provide the fluid required for testing the membrane performance and discharge it into the membrane test fixture (3) through the pipeline. The membrane test fixture (3) includes an upper fixture (31) and a lower fixture (32). The upper fixture (31) and the lower fixture (32) are detachably connected by screws. A membrane sheet (33) is detachably arranged between the upper fixture (31) and the lower fixture (32). A sealing ring (34) for preventing the membrane test fixture (3) from leaking liquid and gas is arranged at the connection between the upper fixture (31) and the lower fixture (32). An exhaust valve (35) is arranged on the upper fixture (31) or the lower fixture (32). The exhaust valve (35) is used to discharge the air in the membrane test fixture (3). A flow channel (36) for fluid circulation is formed in the membrane test fixture (3), and the fluid in the flow channel (36) will pass through the flow channel (36) and through the membrane sheet (33). The inlet of the flow channel (36) is connected to the test fluid supply component through a pipeline, and the outlet of the flow channel (36) communicates with the outside. A fluid collector (37) is arranged at the outlet of the flow channel (36). The fluid collector (37) is used to measure the fluid flowing out from the outlet of the flow channel (36).

2. The membrane performance evaluation test device according to claim 1, wherein, A valve (5) for controlling the opening and closing of the pipeline is arranged on the pipeline between the test fluid supply component and the membrane test fixture (3).

3. The membrane performance evaluation test device according to claim 1, characterized in that, The membrane test fixture (3) further includes a first pressure gauge (38), and the first pressure gauge (38) is arranged at the outlet of the flow channel (36).

4. The film property evaluation and testing device according to claim 1, characterized in that, A second pressure gauge (4) is arranged at the inlet of the flow channel (36), and the second pressure gauge (4) is used to detect the fluid pressure entering the membrane test fixture (3).

5. The film property evaluation and testing device according to claim 1, wherein The inlet of the flow channel (36) is arranged on the upper fixture (31), and the outlet of the flow channel (36) is arranged on the lower fixture (32).

6. The membrane property evaluation test device according to claim 1, wherein The test fluid supply component includes a liquid storage plate (1) and a gear pump (2). The liquid storage plate (1) and the membrane test fixture (3) are connected through a pipeline, and the gear pump (2) is arranged on the pipeline between the liquid storage plate (1) and the membrane test fixture (3). The liquid storage plate (1) includes a base (11), and a detachable water tank (12) is arranged in the base (11). The water tank (12) is used to hold the liquid. The fluid collector (37) is a liquid bottle, and the liquid bottle is used to measure the liquid flowing out from the outlet of the flow channel (36).

7. The film property evaluation and testing device according to claim 6, wherein A magnetic stirrer is arranged in the water tank (12).

8. The membrane performance evaluation and testing device according to claim 6, wherein, A heating rod and a cold trap are arranged in the water tank (12).

9. The membrane performance evaluation and testing device according to claim 1, characterized in that The test fluid supply component is a gas supply device (6), and the gas supply device (6) is used to drive the gas to enter the membrane test fixture (3) through the pipeline. The fluid collector (37) is a gas flow meter that can measure the volume of the flowing out gas.

10. A method for testing the performance of a membrane, which uses the membrane performance evaluation and testing device according to any one of claims 1-9, characterized in that, It has the following operation steps: S1. Cut the membrane sheet (33) well, place it on the lower fixture (32), place the sealing ring (34) on the lower fixture (32), make the membrane sheet (33) located inside the lower fixture (32), cover the upper fixture (31), and tighten the screws to ensure that the membrane test fixture will not leak outwards. S2. Prepare the fluid required for testing the membrane performance through the test fluid supply component; S3. Completely discharge the air in the membrane test fixture (3) through the exhaust valve (35), and supply the fluid through the test fluid supply component to enter the membrane test fixture (3) through the inlet of the pipeline and the flow channel (36). After the fluid passes through the diaphragm (33), it discharges from the outlet of the flow channel (36) out of the membrane test fixture (3), and record the data of the discharged fluid. Calculate the relevant performance of the diaphragm (33) through the difference between the inflowing fluid data and the outflowing fluid data; S4. After the test is completed, save the data and turn off the power supply.

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