Nanofiltration membrane preparation device

Abstract

The nanofiltration membrane preparation device is characterized by comprising a bottom plate, a sliding seat and an air blower, and sliding rails are formed on the two sides of the bottom plate; the sliding seat is arranged on the sliding rail in a sliding manner; the compression roller is arranged on the sliding seat and can move along with the sliding seat; the air blower is arranged on the sliding seat and can move along with the sliding seat, and the air blower is provided with an air outlet blowing air to the upper end face of the bottom plate. By adopting the mode of extruding the nanofiltration base membrane by the compression roller and blowing the nanofiltration base membrane by the air blower, the drying degree and the reaction degree of the nanofiltration base membrane are consistent, so that the experimental error is reduced, and meanwhile, the operation is simple and convenient and the repeatability is strong.

Description

Technical Field

[0001] This utility model relates to a nanofiltration membrane preparation apparatus, and more particularly to a nanofiltration membrane preparation apparatus suitable for small-scale experiments. Background Technology

[0002] Nanofiltration membranes are a major component of household water purifier filter cartridges. They can filter out inorganic salts and heavy metal ions from water while retaining some beneficial calcium and magnesium ions, thus benefiting human health. Compared to reverse osmosis membranes, which remove all ions, nanofiltration membranes offer significant health benefits and represent a future direction for major manufacturers to continue developing.

[0003] When developing new nanofiltration membrane formulations, a small-scale interfacial polymerization experiment is first required. This involves preparing aqueous and oil phase solutions and reacting them on a nanofiltration membrane substrate. Current nanofiltration membrane preparation devices utilize a glass frame. A square glass frame has a 10×10cm square hole cut out. The nanofiltration membrane substrate is cut to a size larger than 10×10cm, and the glass frame is used to hold down the four sides. The aqueous phase solution is first poured into the center of the glass frame, ensuring a uniform coverage of the substrate surface. After soaking for a period, the solution is poured off, and the surface of the substrate is wiped dry with paper. Then, the oil phase solution is poured onto the substrate surface within the frame. The interfacial polymerization reaction begins the moment it is poured in. After reacting for a period, the solution is poured off, wiped dry with paper, and then placed in an oven to dry any excess solution. The remaining solution will continue to react.

[0004] The aforementioned simple apparatus is used in both small-scale nanofiltration experiments within enterprises and in nanofiltration membrane-related pilot experiments at various universities. This apparatus has the advantages of simple structure, strong adaptability, and low cost. However, its disadvantages are also obvious, mainly as follows:

[0005] First, when conducting nanofiltration small-scale experiments with glass apparatus, different solutions need to be poured in frequently, and after dipping, the solution needs to be poured out. After pouring out, the surface of the substrate membrane needs to be wiped dry. The force and degree of wiping each time cannot be quantified, which can easily lead to experimental errors.

[0006] Second, the preparation process used in the pilot-scale experiment cannot be linked to the pilot-scale and mass production. It is impossible to prepare nanofiltration membranes by pouring out the solution and wiping it dry in the pilot-scale.

[0007] Third, the glass frame device cannot achieve temperature and humidity control. In winter and summer, it is impossible to accurately control the reaction temperature of the solution or maintain the solution temperature, resulting in the reaction process not being in a constant temperature state, which affects the experimental results. Utility Model Content

[0008] The technical problem to be solved by this invention is to provide a nanofiltration membrane preparation device with good consistency of reaction conditions, in light of the above-mentioned technical status.

[0009] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a nanofiltration membrane preparation device, characterized in that it includes...

[0010] The base plate has sliding rails on both sides;

[0011] A sliding seat is slidably mounted on a slide rail;

[0012] The pressure roller is mounted on the aforementioned sliding seat and can move together with the sliding seat; and

[0013] A blower, mounted on the aforementioned sliding base and movable with the sliding base, has an air outlet that blows air toward the upper surface of the base plate.

[0014] The base plate has a circulating water pipeline inside, and the inlet and outlet of the circulating water pipeline are connected to a heat pump hot and cold water circulation device. The circulating water pipeline, together with the heat pump hot and cold water circulation device, can achieve temperature control from 15℃ to 60℃, and can control the soaking temperature and reaction temperature.

[0015] Preferably, the blower is a blower blade, and the air outlet of the blower blade gradually decreases in size from the inside to the outside.

[0016] The upper surface of the base plate is inclined, which allows the solution to flow automatically downwards along the upper surface of the base plate.

[0017] To accommodate various testing conditions, the gap between the pressure roller and the base plate is adjustable and is located on the sliding seat.

[0018] Preferably, the sliding seat has an inner cavity equipped with a bushing and a spring. The spring acts on the bushing and forces it to tend to stay away from the base plate. The sliding seat has an adjusting screw with its bottom end extending into the inner cavity. The bottom end of the adjusting screw abuts against the bushing. The end of the pressure roller has a shaft portion that fits into the bushing. The pressing force of the pressure roller can be determined based on the insertion depth of the adjusting screw.

[0019] Furthermore, the bushing extends laterally to both sides with support arms, and the upper end of the spring abuts against the lower end face of the support arm.

[0020] Furthermore, the base plate is detachably provided with a frame for pressing down the nanofiltration membrane, the frame having a central space for adding the reaction solution to the surface of the base membrane. The base plate is equipped with a pressure strip for pressing down the nanofiltration membrane, and the frame is adapted to the outside of the pressure strip.

[0021] To facilitate manual operation, the sliding seat is equipped with a handle.

[0022] Compared with existing technologies, the advantages of this invention are as follows: Pushing the sliding seat drives the pressure roller and air knife to squeeze out excess aqueous solution from the surface of the base membrane, ensuring the base membrane surface maintains the same degree of dryness and guaranteeing the repeatability of experimental results. The method of using pressure rollers to squeeze and air blowers to clean the nanofiltration base membrane ensures consistent dryness and reaction degree, thereby reducing experimental errors. Furthermore, it is simple to operate and highly repeatable. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment.

[0024] Figure 2 This is a schematic diagram of the structure from another perspective of the embodiment.

[0025] Figure 3 for Figure 1 The exploded diagram.

[0026] Figure 4 This is a three-dimensional sectional view of the base plate.

[0027] Figure 5 This is an enlarged view of the sliding seat. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, the filter membrane preparation device in this embodiment includes a base plate 1, a sliding seat 2, a pressure roller 3, a blower 4, a pressure strip 5, and a frame 6.

[0030] Slide rails 11 are formed on both sides of the base plate 1; the upper surface of the base plate 1 is inclined, which facilitates the subsequent solution to automatically flow down the upper surface of the base plate from high to low and enter the aqueous phase collection container. Figure 5 As shown, the base plate 1 has a circulating water pipe 12 inside. The inlet 121 and outlet 122 of the circulating water pipe 12 are connected to a heat pump hot and cold water circulation device (not shown in the figure). The circulating water pipe 12, together with the heat pump hot and cold water circulation device, can achieve temperature control of 15℃-60℃.

[0031] The sliding seat 2 is slidably mounted on the slide rail 11. In this embodiment, there are two sliding seats 2 connected by a handle 22 to form a whole. Each sliding seat 2 has a slide plate 21 at its lower end, and the slide plate 21 is slidably engaged with the slide rail 11.

[0032] The pressure roller 3 is mounted on the sliding seat 2 and can move together with the sliding seat 2; the gap between the pressure roller 3 and the base plate 1 is adjustable. Specifically, as shown... Figure 4As shown, the inner cavity 23 of the sliding seat 2 is provided with a bushing 72 and a spring 73. The bushing 72 extends laterally to both sides with support arms 721. The upper end of the spring 73 abuts against the lower end face of the support arm 721, so that the spring 73 forces the bushing 72 to keep away from the base plate 1. The sliding seat 2 is provided with an adjusting screw 71 whose bottom end can extend into the inner cavity 23. The bottom end of the adjusting screw 71 abuts against the bushing 72. The end of the pressure roller 3 has a shaft portion 31 that fits into the bushing 72. The pressure roller 3 can be made of rubber.

[0033] The blower 4 is mounted on the sliding base 2 and can move with the sliding base 2. The blower 4 has an air outlet 41 that blows air towards the upper surface of the base plate 1. In this embodiment, the blower 4 is a blower blade. The air outlet 41 of the blower blade gradually narrows from the inside to the outside. The two ends of the blower blade form air inlet ports 42. An adjusting valve can be installed on the air inlet port 42 to control the airflow.

[0034] The base plate 1 is detachably provided with a frame 5 for holding the nanofiltration membrane, and the frame 5 forms a space in the middle for adding the reaction solution to the surface of the base membrane. The base plate 1 is equipped with a pressure strip 6 for holding the nanofiltration membrane, and the frame 5 is adapted to the outside of the pressure strip 6. Both the pressure strip and the frame can be made of metal.

[0035] The nanofiltration membrane 10 is laid flat on the base plate and positioned using a pressure strip. A frame is then used to hold the pressure strip and the nanofiltration membrane 10 in place, forming a closed recessed space above the nanofiltration membrane 10. This space is used to add the reaction solution to the membrane surface. A measured amount of aqueous solution is first poured into the space on the surface of the nanofiltration membrane 10. After standing for a period of time, the frame is removed. Because the base plate is sloped, the solution will automatically flow downwards along the surface and into the aqueous phase collection container.

[0036] The pressure of the pressure roller can be changed by adjusting the adjusting screws on both sides, and the airflow of the blower can be adjusted by adjusting the opening of the air valve.

[0037] The optimal pressure roller pressure and air volume for a certain formula or operating condition are determined by experiment. The sliding seat is manually pushed to drive the pressure roller and the air knife to squeeze out the excess aqueous solution on the surface of the base film, so that the surface of the base film maintains the same degree of dryness and ensures that the results of each experiment are repeatable.

[0038] After soaking in the aqueous solution and squeezing out a certain amount of water, the frame is placed on top of the base membrane, and a certain amount of oil phase solution is poured onto the surface of the base membrane. At this point, the residual aqueous solution inside the base membrane and the poured oil phase solution begin an interfacial polymerization reaction. After reacting for a period of time, the frame is removed, and the oil phase solution will flow down again. At this point, the extrusion rollers and air blowers need to be pushed again to squeeze out the excess oil phase solution on the membrane, preventing further reaction and avoiding over-reaction. After extrusion, the nanofiltration membrane can be removed for the next drying operation.

[0039] During membrane preparation, the heat pump hot and cold water circulation device is turned on, and the nanofiltration membrane reaction temperature is set to ensure that the temperature remains constant during the immersion of the solution on the membrane surface, avoiding a drop in membrane temperature due to prolonged immersion. After the aqueous solution immersion is completed, the oil phase solution needs to be poured in to start the interfacial polymerization reaction. At this time, it is even more important to strictly control the reaction temperature on the membrane to avoid affecting the reaction effect.

[0040] In the development of new functional nanofiltration membranes, the formula and process are first adjusted using a pilot-scale device. Process parameters include, but are not limited to, solution soaking time, extrusion pressure, and air-drying degree by the air knife. After the membrane performance in the pilot-scale test is satisfactory, pilot-scale production begins. The pilot-scale production is basically set up and fine-tuned according to the formula and process of the pilot-scale test. This invention allows adjustment of the membrane soaking time, extrusion pressure, and air knife airflow, satisfying the process exploration needs during the transition from pilot-scale to pilot-scale testing, and providing initial values ​​and adjustment rules for pilot-scale parameter settings.

Claims

1. A nanofiltration membrane fabrication apparatus, characterized in that... include The base plate (1) has slide rails (11) on both sides; The sliding seat (2) is slidably mounted on the slide rail (11); The pressure roller (3) is disposed on the aforementioned sliding seat (2) and can move together with the sliding seat (2); and A blower (4) is provided on the aforementioned sliding seat (2) and can move together with the sliding seat (2). The blower (4) has an air outlet (41) that blows towards the upper surface of the base plate (1).

2. The nanofiltration membrane fabrication apparatus according to claim 1, characterized in that... The base plate (1) has a circulating water pipe (12) inside, and the inlet (121) and outlet (122) of the circulating water pipe (12) are connected to a heat pump hot and cold water circulation device.

3. The nanofiltration membrane fabrication apparatus according to claim 1, characterized in that... The blower (4) is a blower blade, and the air outlet (41) of the blower blade gradually shrinks from the inside to the outside.

4. The nanofiltration membrane fabrication apparatus according to claim 1, characterized in that... The upper surface of the base plate (1) is inclined.

5. The nanofiltration membrane fabrication apparatus according to claim 1, characterized in that... The gap between the pressure roller (3) and the base plate (1) is adjustable and is provided on the sliding seat (2).

6. The nanofiltration membrane fabrication apparatus according to claim 5, characterized in that... The inner cavity (23) of the sliding seat (2) is provided with a bushing (72) and a spring (73). The aforementioned spring (73) acts on the bushing (72) and forces the bushing (72) to tend to stay away from the base plate (1). The sliding seat (2) is provided with an adjusting screw (71) whose bottom end can extend into the inner cavity (23). The bottom end of the adjusting screw (71) abuts against the bushing (72). The end of the pressure roller (3) has a shaft portion (31) adapted to fit inside the bushing (72).

7. The nanofiltration membrane fabrication apparatus according to claim 6, characterized in that... The bushing (72) has support arms (721) extending laterally to both sides, and the upper end of the spring (73) abuts against the lower end face of the support arm (721).

8. The nanofiltration membrane fabrication apparatus according to claim 1, characterized in that... The base plate (1) is detachably provided with a frame (5) for pressing down the nanofiltration membrane, and the middle of the frame (5) forms a space for adding reaction solution to the surface of the base membrane.

9. The nanofiltration membrane fabrication apparatus according to claim 8, characterized in that... The base plate (1) is equipped with a pressure strip (6) for pressing down the nanofiltration membrane, and the frame (5) is adapted to the outside of the pressure strip (6).

10. The nanofiltration membrane fabrication apparatus according to claim 1, characterized in that... The sliding seat (2) is provided with a handle (22).

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