Solvent-resistant nanofiltration membrane equipment

Abstract

The utility model discloses solvent-resistant nanofiltration membrane equipment, which belongs to the technical field of nanofiltration membrane equipment and comprises a nanofiltration membrane component and an equipment main body, the nanofiltration membrane component comprises a first nanofiltration membrane component and a second nanofiltration membrane component, the equipment main body is provided with a main liquid pipe, and the main liquid pipe is simultaneously connected with the first nanofiltration membrane component and the second nanofiltration membrane component; and valve body assemblies are arranged between the main liquid pipe and the first nanofiltration membrane and between the main liquid pipe and the second nanofiltration membrane. The main liquid pipe conveys a reaction solution into the nanofiltration membrane for filtration, when the main liquid pipe is communicated with the normally used nanofiltration membrane assembly, the other nanofiltration membrane assembly is disconnected from the main liquid pipe, and only one nanofiltration membrane assembly is communicated with the main liquid pipe all the time through opening and closing operation of the valve body assembly. Therefore, when the nanofiltration membrane assembly in use is blocked, the standby nanofiltration membrane assembly can be switched to continue working, continuous filtering work of a reaction solution is achieved, and the filtering efficiency of the nanofiltration membrane equipment is improved.

Description

Technical Field

[0001] The utility model relates to a nanofiltration membrane separation device, and more specifically, it relates to a solvent-resistant nanofiltration membrane device. Background Art

[0002] The application of continuous flow microchannel technology in pharmaceutical synthesis is increasing, and the requirements for post-treatment of mixed solutions after reaction are also shifting towards continuous flow. Membrane separation technology can replace traditional distillation and extraction and become a post-treatment separation technology suitable for continuous flow processes. However, the current solvent-resistant nanofiltration membrane separation equipment is basically purely manual operation, and workers need to take turns to replace it during long-term operation. Moreover, after a certain period of operation, the membrane will be blocked by dirt, and manual replacement and cleaning require the equipment to be stopped, affecting the operation of the overall process.

[0003] For example: Chinese patent announcement number CN220317486U, announcement date January 9, 2024, the name of the utility model is an automated reverse osmosis mechanism, and the application discloses an osmosis device technology, including a base, a pretreatment box and a reverse osmosis mechanism body are fixedly installed on the top of the base, a delivery pipe is fixedly installed between the pretreatment box and the reverse osmosis mechanism body, and a solenoid valve is provided on the delivery pipe; this solution can effectively remove suspended particles and sediments in sewage, prevent clogging of the pores of the reverse osmosis membrane, extend the service life of the membrane and protect the membrane from damage; however, after long-term use, the osmosis membrane will still be clogged and cannot work continuously. Utility Model Content

[0004] The utility model overcomes the problem that the existing solvent-resistant nanofiltration membrane equipment cannot work continuously or the continuous work is complicated, and provides a solvent-resistant nanofiltration membrane equipment; this scheme can realize the continuous work of the solvent-resistant nanofiltration membrane equipment and improve the filtration efficiency of the nanofiltration membrane equipment.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme: a solvent-resistant nanofiltration membrane device, comprising a nanofiltration membrane assembly and a device body, wherein the nanofiltration membrane assembly comprises a first nanofiltration membrane assembly and a second nanofiltration membrane assembly, and the device body is provided with a main liquid pipe, wherein the main liquid pipe is connected to the first nanofiltration membrane assembly and the second nanofiltration membrane assembly at the same time; and a valve body assembly is provided between the main liquid pipe and the first nanofiltration membrane, and between the main liquid pipe and the second nanofiltration membrane. In this scheme, two nanofiltration membrane assemblies are provided, one for normal use and the other for standby state, and the main liquid pipe transports the reaction solution to the nanofiltration membrane for filtration, and when the main liquid pipe is connected to the nanofiltration membrane assembly in normal use, the other nanofiltration membrane assembly is disconnected from the main liquid pipe, and the valve body assembly is opened and closed to realize that only one nanofiltration membrane assembly is always connected to the main liquid pipe, so that when the nanofiltration membrane assembly in use is blocked, the standby nanofiltration membrane assembly can be switched to continue working, so as to realize continuous filtration of the reaction solution and improve the filtration efficiency of the nanofiltration membrane device.

[0006] Preferably, a liquid inlet pipe is provided in the main body of the device, the liquid inlet pipe is connected to the main liquid pipe, and a liquid delivery pump is provided on the liquid inlet pipe. The liquid inlet pipe is used to input the reaction solution, and the liquid delivery pump can pump the reaction solution into the main liquid pipe, and then into the nanofiltration membrane assembly for filtration.

[0007] Preferably, a pressure gauge is provided on the liquid inlet pipe, and the pressure gauge on the liquid inlet pipe can detect the pressure of the reaction solution in the pipe at all times, so as to judge the liquid inlet condition of the reaction solution.

[0008] Preferably, the liquid inlet pipe is further provided with a first flow meter, which can detect the flow rate and other conditions of the reaction solution in the pipe and can also determine the liquid inlet condition of the reaction solution.

[0009] Preferably, the main body of the device is provided with a first liquid outlet pipe and a second liquid outlet pipe, and the first liquid outlet pipe and the second liquid outlet pipe are both connected to the first nanofiltration membrane assembly and the second nanofiltration membrane assembly at the same time. After filtering the reaction solution between the nanofiltration membrane assemblies, two components will be obtained, one of which flows out through the first liquid outlet pipe and the other flows out through the second liquid outlet pipe. The first liquid outlet pipe and the second liquid outlet pipe both need to be connected to two nanofiltration membrane assemblies, so that the nanofiltration membrane assembly in the working state can discharge the filtrate through the first liquid outlet pipe and the second liquid outlet pipe.

[0010] Preferably, the first liquid outlet pipe is provided with a second flow meter, which can detect the flow rate and velocity of the solution in the outlet pipe, thereby reflecting the outlet condition of the filtrate.

[0011] Preferably, a thermometer is provided on the second liquid outlet pipe, which can detect the temperature of the reaction solution in the pipe to ensure that the solution is within a qualified temperature range.

[0012] Preferably, the second liquid outlet pipe is further provided with an electric control valve, which can change the aperture size in the second liquid outlet pipe, thereby changing the solution pressure in the second liquid outlet pipe, so that the solution pressure and flow rate in the first liquid outlet pipe change together, thereby improving the filtration efficiency of the nanofiltration membrane device.

[0013] Preferably, the device body is provided with an electric control system which can control all components in the nanofiltration membrane device so that the nanofiltration membrane device can work normally.

[0014] Preferably, the device body is also provided with a display screen which can display the conditions of the solutions in the various pipelines in the device, and display parameters such as the temperature, flow rate, and pressure of the solutions, thus providing a prompting effect.

[0015] Compared with the prior art, the beneficial effects of the utility model are: (1) a spare nanofiltration membrane assembly is provided, which can realize the continuous operation of the solvent-resistant nanofiltration membrane equipment and improve the filtration efficiency of the nanofiltration membrane equipment; (2) the solution pressure in the liquid outlet pipe can be changed to maximize the filtration efficiency of the nanofiltration membrane and reduce the number of switching times of the nanofiltration membrane assembly; (3) the structure is simple, the production cost is low, it is easy to implement, and it has high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view schematic diagram of the internal structure of the utility model.

[0017] Figure 2 It is an axonometric schematic diagram of the internal structure of the utility model.

[0018] Figure 3 This is a schematic diagram of the internal structure of the utility model from another perspective.

[0019] Figure 4 It is a schematic diagram of the utility model.

[0020] Figure 5 It is the front view of the utility model.

[0021] In the figure: 1. nanofiltration membrane assembly, 1.1. first nanofiltration membrane assembly, 1.2. second nanofiltration membrane assembly, 2. equipment body, 3. main liquid pipe, 3.1. main liquid branch pipe, 4. valve body assembly, 5. liquid inlet pipe, 5.1. liquid inlet hole, 6. liquid delivery pump, 7. pressure gauge, 8. first flow meter, 9. first liquid outlet pipe, 9.1. first liquid outlet hole, 10. second liquid outlet pipe, 10.1. second liquid outlet hole, 11. second flow meter, 12. thermometer, 13. electric control valve, 14. electric control system, 15. display screen, 16. fixed bracket, 17. liquid outlet branch pipe. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Example 1: Figures 1 to 3 A solvent-resistant nanofiltration membrane device is shown, including an equipment body 2, which is a rectangular box structure. A nanofiltration membrane assembly 1 is fixedly arranged on the outer wall of the equipment body 2, and the nanofiltration membrane assembly 1 includes a first nanofiltration membrane assembly 1.1 and a second nanofiltration membrane assembly 1.2. The first nanofiltration membrane assembly 1.1 and the second nanofiltration membrane assembly 1.2 are arranged in parallel up and down, the first nanofiltration membrane assembly 1.1 is located on the lower side, and the second nanofiltration membrane assembly 1.2 is located on the upper side, and the first nanofiltration membrane assembly 1.1 and the second nanofiltration membrane assembly 1.2 are connected together by two fixed brackets 16, so that the first nanofiltration membrane assembly 1.1 and the second nanofiltration membrane assembly 1.2 form a whole, and a main liquid pipe 3 is arranged between the nanofiltration membrane assembly 1 and the equipment body 2, and a through hole is arranged on the side wall of the equipment body 2 corresponding to the main liquid pipe 3. The main liquid pipe 3 connects the nanofiltration membrane assembly 1 with the inside of the equipment body 2. Specifically, the main liquid pipe 3 is directly connected to the first nanofiltration membrane assembly 1.1, and a main liquid branch pipe 3.1 is branched from the main liquid pipe 3 and connected to the second nanofiltration membrane assembly 1.2, so that the main liquid pipe 3 is connected to both the first nanofiltration membrane assembly 1.1 and the second nanofiltration membrane assembly 1.2.

[0024] Two through holes are also provided on the side wall of the equipment body 2 corresponding to the main liquid pipe 3, and the two through holes are used for the filtrate of the nanofiltration membrane assembly 1 to enter, and the first liquid outlet pipe 9 and the second liquid outlet pipe 10 are provided in the two through holes, and the first liquid outlet pipe 9 and the second liquid outlet pipe 10 are connected to the nanofiltration membrane assembly 1. Specifically, the first liquid outlet pipe 9 and the second liquid outlet pipe 10 are simultaneously connected to the first nanofiltration membrane assembly 1.1. After the reaction solution is introduced into the main liquid pipe 3, the reaction solution enters the first nanofiltration membrane assembly 1.1 for filtration to obtain two components, a membrane-permeable liquid and a concentrated liquid; wherein, the membrane-permeable liquid flows out through the first liquid outlet pipe 9, The concentrated liquid flows out through the second liquid outlet pipe 10; in addition, the first liquid outlet pipe 9 and the second liquid outlet pipe 10 are also connected to the second nanofiltration membrane assembly 1.2. Specifically, two liquid outlet branch pipes 17 are provided on both sides of the second nanofiltration membrane assembly 1.2, and the two liquid outlet branch pipes 17 are respectively connected to the first liquid outlet pipe 9 and the second liquid outlet pipe 10. When the reaction solution of the main liquid pipe 3 enters the second nanofiltration membrane assembly 1.2 through the main liquid branch pipe 3.1, the reaction solution is also filtered to obtain two components, namely, a permeate liquid and a concentrated liquid, and the permeate liquid flows out through the first liquid outlet pipe 9, and the concentrated liquid flows out through the second liquid outlet pipe 10.

[0025] A valve body assembly 4 is also provided between the main liquid pipe 3 and the nanofiltration membrane assembly 1. Specifically, the valve body assembly 4 is a stop valve. When the equipment is operating normally, only one of the first nanofiltration membrane assembly 1.1 and the second nanofiltration membrane assembly 1.2 will perform filtering work, and the other is in a standby state. When only the first nanofiltration membrane assembly 1.1 is operating, the stop valve between the main liquid pipe 3 and the second nanofiltration membrane assembly 1.2 is closed, and the reaction solution in the main liquid pipe 3 can only enter the first nanofiltration membrane assembly 1.1 for filtration. When the first nanofiltration membrane assembly 1.1 has been operating for a long time and the pores in the first nanofiltration membrane assembly 1.1 are seriously blocked, the stop valve between the main liquid pipe 3 and the second nanofiltration membrane 1.2 can be opened, and the stop valve between the main liquid pipe 3 and the first nanofiltration membrane assembly 1.1 can be closed. At this time, the seriously blocked first nanofiltration membrane assembly 1.1 can be backwashed, and the cleaned first nanofiltration membrane assembly 1.1 can be used as a standby nanofiltration membrane assembly. When the second nanofiltration membrane assembly 1.2 is blocked, the first nanofiltration membrane assembly 1.1 can be reactivated.

[0026] A first liquid outlet hole 9.1, a second liquid outlet hole 9.2 and a liquid inlet hole 5.1 are arranged on the side of the equipment body 2 away from the main liquid pipe 3. A liquid inlet pipe 5 is installed in the liquid inlet hole 5. The liquid inlet pipe 5 is used to introduce the reaction solution. A liquid delivery pump 6, a pressure gauge 7 and a first flow meter 8 are also arranged on the liquid inlet pipe 5. The liquid delivery pump 6 serves as a power structure to pump the reaction solution into the nanofiltration membrane assembly 1. The pressure gauge 7 can detect the pressure of the reaction solution in the liquid inlet pipe 5 at all times. The first flow meter 8 can detect the flow rate and velocity of the reaction solution in the liquid inlet pipe 5, thereby being able to judge the liquid inflow condition of the reaction solution.

[0027] The first liquid outlet hole 9.1 passes through the first liquid outlet pipe 9, and the second liquid outlet hole 10.1 passes through the second liquid outlet pipe 10. A second flow meter 11 is provided on the first liquid outlet pipe 9. The second flow meter 11 can detect the flow rate of the membrane liquid in the first liquid outlet pipe 9, thereby reflecting the liquid discharge of the membrane liquid. A thermometer 12 and an electric control valve 13 are provided on the second liquid outlet pipe 10. The electric control valve 13 is arranged below the thermometer 12 and close to the outlet position of the second liquid outlet pipe 10. The thermometer 12 can detect the temperature of the concentrated liquid in the second liquid outlet pipe 10 to ensure that the concentrated liquid is within a qualified temperature range. The electric control valve 13 can adjust the size of the liquid outlet aperture in the second liquid outlet pipe 10. After the equipment is continuously operated, the membrane in the nanofiltration membrane assembly 1 is contaminated by the solute components, and the flow rate of the membrane liquid in the inlet of the first liquid outlet pipe 9 will gradually decrease. At this time, the flow rate of the membrane liquid at the inlet of the first liquid outlet pipe 9 can be increased by changing the pressure in the outlet of the second liquid outlet pipe 10, thereby improving the filtration efficiency of the nanofiltration membrane assembly 1. Specifically, when the flow rate of the reaction solution in the inlet of the first liquid outlet pipe 9 is reduced to a certain extent (reflected by the second flowmeter 11), the electric control valve 13 can be adjusted to reduce the pipe opening of the second liquid outlet pipe 10, increase the pressure at the outlet of the second liquid outlet pipe 10, and realize the recovery of the flow rate of the membrane liquid in the first liquid outlet pipe 9.

[0028] Example 2: Figures 1 to 5 A solvent-resistant nanofiltration membrane device is shown, including an equipment body 2, which is a rectangular box structure. A nanofiltration membrane assembly 1 is fixedly arranged on the outer wall of the equipment body 2, and the nanofiltration membrane assembly 1 includes a first nanofiltration membrane assembly 1.1 and a second nanofiltration membrane assembly 1.2. The first nanofiltration membrane assembly 1.1 and the second nanofiltration membrane assembly 1.2 are arranged in parallel up and down, the first nanofiltration membrane assembly 1.1 is located on the lower side, and the second nanofiltration membrane assembly 1.2 is located on the upper side, and the first nanofiltration membrane assembly 1.1 and the second nanofiltration membrane assembly 1.2 are connected together by two fixed brackets 16, so that the first nanofiltration membrane assembly 1.1 and the second nanofiltration membrane assembly 1.2 form a whole, and a main liquid pipe 3 is arranged between the nanofiltration membrane assembly 1 and the equipment body 2, and a through hole is arranged on the side wall of the equipment body 2 corresponding to the main liquid pipe 3. The main liquid pipe 3 connects the nanofiltration membrane assembly 1 with the inside of the equipment body 2. Specifically, the main liquid pipe 3 is directly connected to the first nanofiltration membrane assembly 1.1, and a main liquid branch pipe 3.1 is branched from the main liquid pipe 3 and connected to the second nanofiltration membrane assembly 1.2, so that the main liquid pipe 3 is connected to both the first nanofiltration membrane assembly 1.1 and the second nanofiltration membrane assembly 1.2.

[0029] Two through holes are also provided on the side wall of the equipment body 2 corresponding to the main liquid pipe 3, and the two through holes are used for the filtrate of the nanofiltration membrane assembly 1 to enter, and the first liquid outlet pipe 9 and the second liquid outlet pipe 10 are provided in the two through holes, and the first liquid outlet pipe 9 and the second liquid outlet pipe 10 are connected to the nanofiltration membrane assembly 1. Specifically, the first liquid outlet pipe 9 and the second liquid outlet pipe 10 are simultaneously connected to the first nanofiltration membrane assembly 1.1. After the reaction solution is introduced into the main liquid pipe 3, the reaction solution enters the first nanofiltration membrane assembly 1.1 for filtration to obtain two components, a membrane-permeable liquid and a concentrated liquid; wherein, the membrane-permeable liquid flows out through the first liquid outlet pipe 9, The concentrated liquid flows out through the second liquid outlet pipe 10; in addition, the first liquid outlet pipe 9 and the second liquid outlet pipe 10 are also connected to the second nanofiltration membrane assembly 1.2. Specifically, two liquid outlet branch pipes 17 are provided on both sides of the second nanofiltration membrane assembly 1.2, and the two liquid outlet branch pipes 17 are respectively connected to the first liquid outlet pipe 9 and the second liquid outlet pipe 10. When the reaction solution of the main liquid pipe 3 enters the second nanofiltration membrane assembly 1.2 through the main liquid branch pipe 3.1, the reaction solution is also filtered to obtain two components, namely, a permeate liquid and a concentrated liquid, and the permeate liquid flows out through the first liquid outlet pipe 9, and the concentrated liquid flows out through the second liquid outlet pipe 10.

[0030] A valve body assembly 4 is also provided between the main liquid pipe 3 and the nanofiltration membrane assembly 1. Specifically, the valve body assembly 4 is a stop valve. When the equipment is operating normally, only one of the first nanofiltration membrane assembly 1.1 and the second nanofiltration membrane assembly 1.2 will perform filtering work, and the other is in a standby state. When only the first nanofiltration membrane assembly 1.1 is operating, the stop valve between the main liquid pipe 3 and the second nanofiltration membrane assembly 1.2 is closed, and the reaction solution in the main liquid pipe 3 can only enter the first nanofiltration membrane assembly 1.1 for filtration. When the first nanofiltration membrane assembly 1.1 has been operating for a long time and the pores in the first nanofiltration membrane assembly 1.1 are seriously blocked, the stop valve between the main liquid pipe 3 and the second nanofiltration membrane 1.2 can be opened, and the stop valve between the main liquid pipe 3 and the first nanofiltration membrane assembly 1.1 can be closed. At this time, the seriously blocked first nanofiltration membrane assembly 1.1 can be backwashed, and the cleaned first nanofiltration membrane assembly 1.1 can be used as a standby nanofiltration membrane assembly. When the second nanofiltration membrane assembly 1.2 is blocked, the first nanofiltration membrane assembly 1.1 can be reactivated.

[0031] A first liquid outlet hole 9.1, a second liquid outlet hole 9.2 and a liquid inlet hole 5.1 are arranged on the side of the equipment body 2 away from the main liquid pipe 3. A liquid inlet pipe 5 is installed in the liquid inlet hole 5. The liquid inlet pipe 5 is used to introduce the reaction solution. A liquid delivery pump 6, a pressure gauge 7 and a first flow meter 8 are also arranged on the liquid inlet pipe 5. The liquid delivery pump 6 serves as a power structure to pump the reaction solution into the nanofiltration membrane assembly 1. The pressure gauge 7 can detect the pressure of the reaction solution in the liquid inlet pipe 5 at all times. The first flow meter 8 can detect the flow rate and velocity of the reaction solution in the liquid inlet pipe 5, thereby being able to judge the liquid inflow condition of the reaction solution.

[0032] The first liquid outlet hole 9.1 passes through the first liquid outlet pipe 9, and the second liquid outlet hole 10.1 passes through the second liquid outlet pipe 10. A second flow meter 11 is provided on the first liquid outlet pipe 9. The second flow meter 11 can detect the flow rate of the membrane liquid in the first liquid outlet pipe 9, thereby reflecting the liquid discharge of the membrane liquid. A thermometer 12 and an electric control valve 13 are provided on the second liquid outlet pipe 10. The electric control valve 13 is arranged below the thermometer 12 and close to the outlet position of the second liquid outlet pipe 10. The thermometer 12 can detect the temperature of the concentrated liquid in the second liquid outlet pipe 10 to ensure that the concentrated liquid is within a qualified temperature range. The electric control valve 13 can adjust the size of the liquid outlet aperture in the second liquid outlet pipe 10.

[0033] An electric control system 14 is also provided on the device body 2. The electric control system 14 is concentrated on the upper side of the device body 2. A controller such as a PLC can be used to control various components in the device, so that the solvent-resistant nanofiltration membrane device can work normally and orderly. In order to better monitor the parameters on various pipelines in the device, the device is also equipped with a display screen 15. The display screen 15 and the electric control system 14 are arranged on the upper side of the device body 2. The display screen 15 can be a touch screen to facilitate the user to operate the device.

[0034] After the equipment is continuously operated, the membrane in the nanofiltration membrane assembly 1 is contaminated by the solute components, and the flow rate of the membrane liquid in the inlet of the first liquid outlet pipe 9 will gradually decrease. At this time, the flow rate of the membrane liquid at the inlet of the first liquid outlet pipe 9 can be increased by changing the pressure in the outlet of the second liquid outlet pipe 10, thereby improving the filtration efficiency of the nanofiltration membrane assembly 1. Specifically, the minimum flow rate value of the first liquid outlet pipe 9 and the maximum pressure value of the system are set in the electric control system 14. When the flow rate of the reaction solution in the inlet of the first liquid outlet pipe 9 is reduced to the minimum flow rate value of the first liquid outlet pipe 9, it is detected by the second flow meter 11, and the detection data is transmitted to the electric control system 14. The electric control system 14 will appropriately and autonomously adjust the electric control valve 13 to reduce the pipe opening of the second liquid outlet pipe 10, increase the pressure at the outlet of the second liquid outlet pipe 10, and realize the recovery of the flow rate of the membrane liquid in the first liquid outlet pipe 9. At the same time, if the flow rate of the liquid passing through the membrane of the first liquid outlet pipe 9 is about to be lower than the minimum flow rate value of the first liquid outlet pipe 9, and the electronic control system 14 does not work, the user can also adjust the parameters of the electronic control valve 13 independently to reduce the pipe opening of the second liquid outlet pipe 10. When the pressure at the outlet of the second liquid outlet pipe 10 has reached the maximum pressure value that the system can operate when the electronic control valve 13 is adjusted, it means that the pollution in the filter membrane assembly is serious and the separation capacity cannot meet the set requirements. At this time, it is necessary to replace the spare nanofiltration membrane assembly. The electronic control system 14 will open the valve body assembly 4 corresponding to the corresponding nanofiltration membrane assembly and close the valve body assembly 4 corresponding to the contaminated nanofiltration membrane assembly. At this time, the seriously contaminated nanofiltration membrane assembly can be cleaned. Thereby achieving the continuous operation of the solvent-resistant nanofiltration membrane equipment and improving the filtration efficiency of the nanofiltration membrane equipment.

Claims

1. A solvent-resistant nanofiltration membrane device, It is characterized in that It includes a nanofiltration membrane assembly and an equipment body, wherein the nanofiltration membrane assembly includes a first nanofiltration membrane assembly and a second nanofiltration membrane assembly, and the equipment body is provided with a main liquid pipe, which simultaneously connects the first nanofiltration membrane assembly and the second nanofiltration membrane assembly; a valve body assembly is provided between the main liquid pipe and the first nanofiltration membrane, and between the main liquid pipe and the second nanofiltration membrane.

2. A solvent-resistant nanofiltration membrane device according to claim 1, Its characteristics are: A liquid inlet pipe is arranged in the main body of the equipment, the liquid inlet pipe is communicated with the main liquid pipe, and a liquid delivery pump is arranged on the liquid inlet pipe.

3. A solvent-resistant nanofiltration membrane device according to claim 2, Its characteristics are: The liquid inlet pipe is provided with a pressure gauge.

4. A solvent-resistant nanofiltration membrane device according to claim 3, Its characteristics are: The liquid inlet pipe is also provided with a first flow meter.

5. A solvent-resistant nanofiltration membrane device according to claim 1, Its characteristics are: A first liquid outlet pipe and a second liquid outlet pipe are arranged in the main body of the device, and the first liquid outlet pipe and the second liquid outlet pipe are both connected to the first nanofiltration membrane assembly and the second nanofiltration membrane assembly at the same time.

6. A solvent-resistant nanofiltration membrane device according to claim 5, Its characteristics are: The first liquid outlet pipe is provided with a second flow meter.

7. A solvent-resistant nanofiltration membrane device according to claim 6, Its characteristics are: The second liquid outlet pipe is provided with a thermometer.

8. A solvent-resistant nanofiltration membrane device according to claim 7, Its characteristics are: The second liquid outlet pipe is also provided with an electric control valve.

9. A solvent-resistant nanofiltration membrane device according to any one of claims 1 to 8, Its characteristics are: An electric control system is arranged on the equipment body.

10. A solvent-resistant nanofiltration membrane device according to claim 9, Its characteristics are: The device body is also provided with a display screen.

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