Device for testing the H+ or OH- permeability of ion exchange membranes

Abstract

This utility model relates to the technical field of transmittance testing devices, specifically a device for testing the H+ or OH- transmittance of an ion exchange membrane. It includes a first glass bottle containing a second glass tube. The lower end of the second glass tube is open, and a perforated plastic cap is fixed to it via threads. An ion exchange membrane sheet covers the perforation of the cap. Testing procedure: First, cut two 2 cm × 2 cm wet membrane sheets and soak them in a 0.5 mol / L NaCl solution for at least 1 hour. After drying, filter paper is placed over the perforation of the plastic cap, and the cap is fixed to the lower end of the second glass tube. Add 40 ml of 0.5 mol / L hydrochloric acid solution (or 40 ml of 0.5N NaOH solution) to the first glass bottle. Place the second glass tube into the first glass bottle through the connector, and then inject 0.5 mol / L NaCl solution into the second glass tube. Insert a pH electrode into the NaCl solution and record the pH value every 5 minutes for at least 30 minutes. This design improves the convenience of transmittance testing.

Description

Technical Field

[0001] This utility model relates to the technical field of transmittance testing devices, specifically to a device for testing the H+ or OH- transmittance of ion exchange membranes. Background Technology

[0002] Ion exchange membranes are a type of functional polymer membrane material with ion selective permeability. Their core characteristics are that the membrane contains fixed charged groups and mobile counterions. With their unique ion selective transport properties, ion exchange membranes have become key components in many clean energy conversion and storage technologies, water treatment and separation processes.

[0003] In industrial engineering fields, such as the aluminum foil industry, acid-impregnated aluminum foil undergoes surface treatment. Metal ions are dissolved by the acid (or alkali) and enter the solution. When the metal ion concentration reaches a certain level, the acid (or alkali) solution cannot meet the process requirements, necessitating acid-alkali treatment of the waste acid or alkali solution containing metal ions. By utilizing ion exchange membranes for selective permeation of acid or alkali, the resource utilization and recycling of acid or alkali can be achieved. In this process, the H+ or OH- ion permeation rate of the ion exchange membrane determines the membrane flux.

[0004] However, when testing the transmittance of H+ or OH-, there is currently no standardized equipment, the required devices are numerous, and the testing steps are complicated and lengthy, resulting in low efficiency in transmittance testing and hindering the rapid implementation of testing. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a high-efficiency testing device and method for H+ or OH- permeability of ion exchange membranes, so as to solve the problems of numerous testing devices, complicated and lengthy steps, and low testing efficiency in the existing technology, and to achieve rapid and efficient testing of H+ or OH- permeability of ion exchange membranes.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This invention provides a device for testing the H+ or OH- transmittance of an ion exchange membrane, comprising a first glass bottle, a connection port at the upper end of the first glass bottle, a second glass tube disposed within the connection port, a pH electrode disposed within the second glass tube, an opening at the lower end of the second glass tube, and threads on the outer wall of the lower end of the second glass tube. The threads on the outer wall of the second glass tube are matched with a plastic cap with a cap hole, and an ion exchange membrane that covers the cap hole is placed inside the plastic cap. The plastic cap is fixed to the lower end of the second glass tube by the threaded connection.

[0007] Furthermore, the upper end of the first glass bottle is integrally formed with a connection port, and the upper end of the second glass tube is integrally formed with a first ground joint.

[0008] Furthermore, a first threaded block is threadedly connected to the inner circumference of the first ground joint, and the first threaded block is fixedly connected to the pH electrode.

[0009] Furthermore, a jacket is fixedly connected to the circumferential surface of the first glass bottle. Two transmission holes are opened on the circumferential surface of the jacket and the circumferential surface of the first glass bottle. The jacket is used to pass in the heat-insulating liquid and adjust the temperature required for the test.

[0010] Furthermore, the ion exchange membrane covers the perforated plastic cap opening to separate the solutions in the first glass bottle and the second glass tube.

[0011] Beneficial effects The technical solution provided by this utility model has the following advantages compared with the known prior art: First, cut two 2 cm × 2 cm membrane sheets from the wet membrane using a utility knife. Immerse the ion exchange membrane in a 0.5 mol / L NaCl solution for at least one hour. Wipe the membrane dry with filter paper, then place it inside the cap hole of a plastic cap, ensuring it completely covers the hole. Secure the plastic cap to the lower end of the second glass tube by screwing it in. Add 40 ml of 0.5 mol / L HCl (or NaOH) solution to the first glass bottle. Then, connect the second glass tube to the first glass bottle through the connector. Inject 0.5 mol / L NaCl solution into the second glass tube. Insert the pH electrode into the NaCl solution and record the pH value every 5 minutes for at least 30 minutes. This design improves the convenience of transmittance testing.

[0012] Second, by cooperating with the first ground joint, the second glass tube can be stably placed inside the first glass bottle. By rotating the first threaded block, the pH electrode can be stably stabilized inside the second glass tube. The jacket and two transmission holes facilitate connection with external peristaltic pumps, etc., to replenish the liquid in the first glass bottle and control the temperature. Attached Figure Description

[0013] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a front perspective view of the present invention; Figure 2 This is a perspective view of the main cross-section of the present invention; Figure 3 For the present utility model Figure 2 A magnified view of a portion of point A in the middle.

[0015] Reference numerals: 1. First glass bottle; 2. Jacket; 3. Transfer hole; 4. First ground joint; 5. First threaded block; 6. Second glass tube; 7. pH electrode; 8. Cap hole; 9. Ion exchange membrane; 10. Plastic cap. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0017] The present invention will be further described below with reference to the embodiments.

[0018] See attached document Figures 1-3 An ion exchange membrane H+ or OH- permeability testing device includes a first glass bottle 1. The upper end of the first glass bottle 1 has a connection port, and a second glass tube 6 is disposed within the connection port. A pH electrode 7 is disposed within the second glass tube 6. The lower end of the second glass tube 6 is open, and its outer wall is threaded. The thread on the outer wall of the second glass tube 6 is matched with a plastic cap 10 with a cap hole 8. An ion exchange membrane 9 that covers the cap hole 8 is placed inside the plastic cap, and the plastic cap is then fixed to the lower end of the second glass tube 6 by the threads. The ion exchange membrane covers the cap hole 8 of the perforated plastic cap 10, serving to separate the solutions in the first glass bottle 1 and the second glass tube 6.

[0019] In a specific embodiment of this invention, firstly, two 2 cm × 2 cm membrane sheets are cut from the wet membrane using a paper cutter. The ion exchange membrane 9 is then immersed in a 0.5 mol / L NaCl solution for at least one hour. The ion exchange membrane 9 is dried with filter paper and then placed inside the cap hole 8 of the plastic cap 10, completely covering the cap hole 8. The plastic cap is then fixed to the lower end of the second glass tube 6 by screwing it in. 40 ml of 0.5 mol / L HCl solution is added to the first glass bottle. Then, the second glass tube 6 is placed inside the first glass bottle through the connection port. Next, 0.5 mol / L NaCl solution is injected into the second glass tube 6. A pH electrode is inserted into the NaCl solution, and the pH value is recorded every 5 minutes for at least 30 minutes. This design improves the ease of operation and increases the permeability.

[0020] Preferably, in the formula for calculating proton throughput: [H+] = 10 -[ pH ] ×10 6 ×V [H+]—Proton throughput, µmol; V — Volume of NaCl solution, in L.

[0021] In the formula for proton mobility: v[H+] = β[H+] / S v[H+] — Proton mobility, µmol / min / cm 2 ; The slope of the plot of β[H+]—[H+] versus time, µmol / min; S—The area of ​​the membrane through which the current passes, in cm² 2 In this testing apparatus, S is 2.010 cm. 2 .

[0022] Preferably, a stir bar can be provided inside the first glass bottle 1 and the second glass tube 6. Through the cooperation of the stir bar and the stirring table, the liquid in the glass bottle and the glass tube can be fully mixed, ensuring uniform concentration and eliminating dead zones and concentration gradients.

[0023] Please refer to the details. Figures 1-3 The upper end of the first glass bottle 1 is integrally formed with a connection port, and the upper end of the second glass tube 6 is integrally formed with a first ground joint 4. The inner circumference of the first ground joint 4 is threaded with a first threaded block 5, which is fixedly connected to the pH electrode 7. A jacket 2 is fixedly connected to the circumference of the first glass bottle 1. Two transmission holes 3 are opened on the circumference of the jacket 2 and the circumference of the first glass bottle 1. The jacket 2 is used to pass through the heat-insulating liquid and regulate the temperature required for the test.

[0024] In this embodiment: the second glass tube 6 can be stably placed inside the first glass bottle 1 by the cooperation of the connection port and the first ground joint 4. The pH electrode 7 can be stably stabilized inside the second glass tube 6 by the rotation of the first threaded block 5. The jacket 2 and the two transmission holes 3 can be conveniently connected to external peristaltic pumps, etc., to replenish the liquid in the first glass bottle 1 and control the temperature.

[0025] Working Principle: To test the H+ permeability of the membrane, first cut two 2 cm × 2 cm membrane sheets from the wet membrane using a paper cutter. Immerse the ion exchange membrane 9 in a 0.5 mol / L NaCl solution for at least one hour. Dry the ion exchange membrane 9 with filter paper, then place it inside the cap hole 8 of the plastic cap 10, ensuring complete coverage. Secure the plastic cap to the lower end of the second glass tube 6 by screwing it in. Add 40 ml of 0.5 mol / L HCl solution to the first glass bottle 1. Then, place the second glass tube 6 inside the first glass bottle 1 through the connector 12. Inject 0.5 mol / L NaCl solution into the second glass tube 6. Insert the pH electrode into the NaCl solution and record the pH value every 5 minutes for at least 30 minutes. This design improves the ease of operation for permeability testing. When adding 0.5N NaOH solution to the first glass bottle while keeping the second glass tube in NaCl solution, repeat the above test to measure the OH- permeability.

[0026] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. An apparatus for testing the H+ or OH- permeability of an ion exchange membrane, comprising a first glass bottle (1), characterized in that: The upper end of the first glass bottle (1) is provided with a connection port, and a second glass tube (6) is provided inside the connection port. A pH electrode (7) is provided inside the second glass tube (6). The lower end of the second glass tube (6) is open, and the outer wall of the lower end of the second glass tube (6) is provided with threads. The threads on the outer wall of the second glass tube (6) are matched with a plastic cap (10) with a cap hole (8). The cap hole (8) of the plastic cap (10) with holes is covered with an ion exchange membrane. The plastic cap (10) is fixed to the lower end of the second glass tube (6) by threaded connection.

2. The apparatus for testing the H+ or OH- permeability of an ion exchange membrane according to claim 1, characterized in that, The upper end of the first glass bottle (1) is integrally formed with a connection port, and the upper end of the second glass tube (6) is integrally formed with a first ground joint (4).

3. The apparatus for testing the H+ or OH- permeability of an ion exchange membrane according to claim 2, characterized in that, The inner circumferential wall of the first ground joint (4) is threaded with a first threaded block (5), which is fixedly connected to the pH electrode (7).

4. The apparatus for testing the H+ or OH- permeability of an ion exchange membrane according to claim 1, characterized in that, A jacket (2) is fixedly connected to the circumferential surface of the first glass bottle (1). Two transmission holes (3) are opened on the circumferential surface of the jacket (2) and the circumferential surface of the first glass bottle (1). The jacket (2) is used to pass in the heat-insulating liquid and adjust the temperature required for the test.

5. The apparatus for testing the H+ or OH- permeability of an ion exchange membrane according to claim 1, characterized in that, The ion exchange membrane covers the cap hole (8) of the perforated plastic cap (10) to separate the solutions in the first glass bottle (1) and the second glass tube (6).

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