Special device for continuously preparing monovalent ion selective ion exchange membrane

Abstract

The utility model discloses a special device for continuously preparing a monovalent ion selective ion exchange membrane. The special device comprises a first unwinding mechanism, a water tank, a first electro-deposition tank, a second electro-deposition tank, a spraying device, a second unwinding mechanism, a drying device, a first winding device, a washing tank and a second winding device which are sequentially arranged from left to right, the first unwinding mechanism is used for unwinding a dry anion exchange membrane; the second unwinding mechanism is used for unwinding the PET film; the first electro-deposition tank is an electro-deposition tank containing polyethyleneimine PEI, and the second electro-deposition tank is an electro-deposition tank containing sulfonic acid group polymers. According to the utility model, the continuous industrial production of the monovalent ion selective anion / cation exchange membrane can be realized, and the production cost and the labor intensity of the monovalent ion selective anion / cation exchange membrane are reduced.

Description

Technical Field

[0001] This invention belongs to the field of membrane preparation technology, and in particular relates to a special device for the continuous preparation of monovalent ion selective ion exchange membranes. Background Technology

[0002] In recent years, resource scarcity, environmental pollution, and human health have become severe challenges facing the world. On the one hand, the shrinking reserves of fossil mineral resources and the scarcity of water resources have prompted people to explore ways to extract abundant ions or freshwater resources from salt lake brines and seawater, such as calcination, salting out, solvent extraction, precipitation, and adsorption to extract useful ions. However, this inevitably brings environmental pollution problems, thus limiting the application of these methods in the context of sustainable development. On the other hand, drinking water contains many harmful ions, such as bromide ions, which must be removed from the water. Membrane separation technology, especially ion exchange membranes, offers an economical, environmentally friendly, and highly selective method for ion separation, enabling the selective separation of corresponding ions from concentrated aqueous solutions containing chemically similar ions.

[0003] Typically, ordinary ion-exchange membranes have poor selectivity for ions with the same charge but different valence states, and cannot achieve separation between monovalent and multivalent ions during electrodialysis. For example, conventional cation-exchange membranes, driven by a DC electric field, can only indiscriminately allow monovalent cations (such as Na+) to pass through simultaneously. + K + ), divalent cations (such as Ca) 2+ Mg 2+ ) and trivalent cations (such as Al) 3+ Cation exchange membranes can selectively separate cations of different valence states, such as divalent and higher valence cations. Monovalent ion-selective cation exchange membranes preferentially allow monovalent cations to pass through, while blocking most divalent or higher valence cations. The main mechanisms underlying the selective separation of monovalent anions are: 1) electrostatic repulsion; 2) pore size sieving effect; and 3) the properties of the adsorption membrane groups. However, currently, monovalent ion-selective anion / cation exchange membranes are produced in batches, with complex processes, long production times, and high costs, making continuous industrial production difficult. Therefore, it is necessary to provide a dedicated device capable of continuously preparing monovalent ion-selective ion exchange membranes. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention proposes a dedicated apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes. This invention enables continuous industrial production of monovalent ion-selective anion / cation exchange membranes, reducing production costs and labor intensity, achieving uniform modified layer thickness, and improving the operational stability of the monovalent ion-selective anion / cation exchange membranes.

[0005] The technical solution adopted in this utility model is:

[0006] A specialized apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes is characterized by comprising, in sequence, a first unwinding mechanism, a water tank, a first electrodeposition tank, a spraying device, a second unwinding mechanism, a drying device, a first winding device, a washing tank, and a second winding device; rollers are provided between the first unwinding mechanism and the water tank, inside the water tank, between the water tank and the first electrodeposition tank, inside the first electrodeposition tank, between the first electrodeposition tank and the spraying device, between the spraying device and the drying device, between the second unwinding mechanism and the drying device, between the drying device and the first winding device, inside the washing tank, and between the washing tank and the second winding device; these rollers are used for conveying the dry ion exchange membrane and / or polyester film; wherein:

[0007] The first unwinding mechanism is used for unwinding the ion exchange membrane dry film;

[0008] The second unwinding mechanism is used for unwinding polyester film;

[0009] The first winding device is used for winding polyester film;

[0010] The second winding device is used to wind up a monovalent ion selective anion exchange membrane;

[0011] The first electrodeposition tank is an electrodeposition tank containing a first electrodeposition solution composed of sodium chloride, water, and polyethyleneimine (PEI); a first replenishment tank is installed above the first electrodeposition tank, the bottom of the first replenishment tank is connected to the first electrodeposition tank through a first connecting pipe, and a first metering pump is installed on the first connecting pipe.

[0012] Furthermore, it also includes a second electrodeposition tank, which is an electrodeposition tank containing a second electrodeposition solution composed of sodium chloride, water, and a polymer containing sulfonic acid groups, and the second electrodeposition tank is disposed between the first unwinding mechanism and the first electrodeposition tank.

[0013] A second supply tank is installed above the second electrodeposition tank. The bottom of the second supply tank is connected to the second electrodeposition tank through a first connecting pipe, and a second metering pump is installed on the first connecting pipe.

[0014] Furthermore, a first circulation pipeline (18) is provided outside the first electrodeposition tank to circulate the first electrodeposition liquid in the first electrodeposition tank; a second circulation pipeline is provided outside the second electrodeposition tank to circulate the second electrodeposition liquid in the second electrodeposition tank.

[0015] Furthermore, a first total organic carbon online detector is installed on the first circulation pipeline, and the probe or sampling needle of the first total organic carbon online detector is installed in the first circulation pipeline to monitor the total organic carbon content in the first electrodeposition solution in the first electrodeposition tank in real time; a second total organic carbon online detector is installed on the second circulation pipeline, and the probe or sampling needle of the second total organic carbon online detector is installed in the second circulation pipeline to monitor the total organic carbon content in the second electrodeposition solution in the second electrodeposition tank in real time.

[0016] Furthermore, the first electrodeposition tank includes a first storage tank, a first cathode membrane tube, a first anode membrane tube, a first heat exchange device, a first heating device, and a first pump. The first anode membrane tube and the first cathode membrane tube are respectively arranged on the upper and lower parts of the roller in the first storage tank. The lower side of the first storage tank is connected to the inlet of the first storage tank through a first circulation pipeline. The first circulation pipeline (18) is equipped with a first pump (16), a first heat exchange device, and a first heating device. The first cathode membrane tube and the first anode membrane tube are respectively connected to the negative electrode and the positive electrode. The first cathode membrane tube and the first anode membrane tube are respectively provided with an inlet and an outlet of the electrode liquid.

[0017] Furthermore, a first overflow port is provided on the upper side of the first liquid storage tank.

[0018] Furthermore, the second electrodeposition tank includes a second storage tank, a second cathode membrane tube, a second anode membrane tube, a second heat exchange device, a second heating device, and a second pump. The second cathode membrane tube and the second anode membrane tube are respectively arranged on the upper and lower parts of the roller in the second storage tank. The lower side of the second storage tank is connected to the inlet of the second storage tank through a second circulation pipeline. The second circulation pipeline (10) is equipped with a second pump (8), a second heat exchange device, and a second heating device. The second cathode membrane tube and the second anode membrane tube are respectively connected to the negative electrode and the positive electrode. The second cathode membrane tube and the second anode membrane tube are respectively provided with an inlet and an outlet of the electrode liquid.

[0019] Furthermore, a second overflow port is provided on the upper side of the second liquid storage tank.

[0020] Furthermore, the spraying device includes a nozzle, a third metering pump, and a third replenishment tank. A third connecting pipe is provided at the bottom of the third replenishment tank, and a third metering pump is provided on the third connecting pipe. The nozzle is located at the bottom end of the third connecting pipe, and the spraying direction of the nozzle is aligned with the surface of the anion exchange membrane electrodeposition layer.

[0021] Furthermore, it also includes a manual tension regulating valve, which is located between the spraying device and the drying device to ensure uniform adhesion of the anion exchange membrane and the polyester film.

[0022] Furthermore, the drying device includes an oven, a heating pack, an exhaust valve and a ventilation valve, an internal circulation valve and a fresh air valve, a lower air inlet valve and a ventilation valve, an upper air inlet valve and a circulating fan.

[0023] Furthermore, the membranes in the first cathode membrane tube, the second cathode membrane tube, the first anode membrane tube, and the second anode membrane tube are anion exchange membranes.

[0024] Furthermore, the first winding device and the second winding device are respectively equipped with a web guide.

[0025] Compared with the prior art, the beneficial effects of this utility model are reflected in:

[0026] 1. This utility model realizes the continuous industrial production of monovalent ion selective cation exchange membranes, reducing labor intensity, improving product quality, and also reducing production costs.

[0027] 2. The modified layer of this invention has a uniform thickness, which improves the operational stability of the monovalent ion selective anion / cation exchange membrane.

[0028] 3. This invention involves single-sided electrodeposition of a PEI layer and single-sided chemical cross-linking of a cation exchange membrane. While ensuring that the membrane's monovalent ion flux is not reduced, a monovalent ion-selective cation exchange membrane with low membrane resistance can be prepared, and the membrane's monovalent ion selective permeability can be improved. Attached Figure Description

[0029] Figure 1 This is a flow chart of the continuous monovalent ion selective anion exchange membrane production process of Embodiment 1 of this utility model.

[0030] Figure 2 This is a flow chart of the continuous monovalent ion selective cation exchange membrane production process in Embodiment 2 of this utility model. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0034] Example 1

[0035] like Figure 1As shown, this utility model discloses a special apparatus for the continuous preparation of monovalent ion selective anion exchange membranes, comprising a first unwinding mechanism 1, a water tank 2, a second electrodeposition tank 7, a first electrodeposition tank 15, a spraying device 19, a second unwinding mechanism 20, a drying device 21, a first winding device 22, a washing tank 23, and a second winding device 24 arranged sequentially; the first unwinding mechanism 1 and the water tank 2 are positioned between the water tank 2 and the first unwinding mechanism 2, inside the water tank 2, between the water tank 2 and the second electrodeposition tank 7, inside the second electrodeposition tank 7, and within the second electrodeposition tank 7. A conveying roller is provided between the deposition tank 7 and the first electrodeposition tank 15, inside the first electrodeposition tank 15, between the first electrodeposition tank 15 and the spraying device 19, between the spraying device 19 and the drying device 21, between the second unwinding mechanism 20 and the drying device 21, between the drying device 21 and the first winding device 22, inside the washing tank 23, and between the washing tank 23 and the second winding device 24. The conveying roller is used for transporting ion exchange membrane dry film and / or polyester film; wherein:

[0036] The first unwinding mechanism 1 is used for unwinding the ion exchange membrane dry film;

[0037] The second unwinding mechanism 20 is used for unwinding polyester film;

[0038] The first winding device 22 is used for winding polyester film;

[0039] The second winding device 24 is used to wind up a monovalent ion selective anion exchange membrane;

[0040] The second electrodeposition tank 7 is an electrodeposition tank containing a second electrodeposition solution composed of sodium chloride, water, and a polymer containing sulfonic acid groups; a second replenishment tank 4 is installed above the second electrodeposition tank 7, and the bottom of the second replenishment tank 4 is connected to the second electrodeposition tank 7 through a first connecting pipe, and a second metering pump 5 is installed on the first connecting pipe.

[0041] The first electrodeposition tank 15 is an electrodeposition tank containing a first electrodeposition solution composed of sodium chloride, water and polyethyleneimine (PEI); a first supply tank 12 is installed above the first electrodeposition tank 15, the bottom of the first supply tank 12 is connected to the first electrodeposition tank 15 through a first connecting pipe, and a first metering pump 13 is provided on the first connecting pipe.

[0042] The first electrodeposition tank 15 is provided with a first circulation pipe 18 for circulating the first electrodeposition solution in the first electrodeposition tank; the second electrodeposition tank 7 is provided with a second circulation pipe 10 for circulating the second electrodeposition solution in the second electrodeposition tank.

[0043] A first total organic carbon online detector 33 is installed on the first circulation pipeline 18. The probe or sampling needle of the first total organic carbon online detector 33 is installed in the first circulation pipeline 18 to monitor the total organic carbon content in the first electrodeposition solution in the first electrodeposition tank 15 in real time. A second total organic carbon online detector 32 is installed on the second circulation pipeline 10. The probe or sampling needle of the second total organic carbon online detector 32 is installed in the second circulation pipeline 10 to monitor the total organic carbon content in the second electrodeposition solution in the second electrodeposition tank 7 in real time.

[0044] The first electrodeposition tank 15 includes a first storage tank, a first cathode membrane tube 11, a first anode membrane tube 14, a first heat exchange device 27, a first heating device 28, and a first pump 16. The first anode membrane tube 14 and the first cathode membrane tube 11 are respectively arranged on the upper and lower parts of the roller in the first storage tank. The lower side of the first storage tank is connected to the inlet of the first storage tank through a first circulation pipe 18. The first pump 16, the first heat exchange device 27, and the first heating device 28 are provided on the first circulation pipe 18. The first cathode membrane tube 11 and the first anode membrane tube 14 are respectively connected to the negative electrode and the positive electrode. The first cathode membrane tube 11 and the first anode membrane tube 14 are respectively provided with an inlet and an outlet of the electrode solution.

[0045] Specifically, a first overflow port 17 is provided on the upper side of the first liquid storage tank.

[0046] The second electrodeposition tank 7 includes a second storage tank, a second cathode membrane tube 6, a second anode membrane tube 3, a second heat exchange device 25, a second heating device 26, and a second pump 8. The second cathode membrane tube 6 and the second anode membrane tube 3 are respectively arranged on the upper and lower parts of the roller in the second storage tank. The lower side of the second storage tank is connected to the inlet of the second storage tank through a second circulation pipe 10, and the second circulation pipe 10 is equipped with the second pump 8, the second heat exchange device 25, and the second heating device 26. The second cathode membrane tube 6 and the second anode membrane tube 3 are respectively connected to the negative electrode and the positive electrode, and the second cathode membrane tube 6 and the second anode membrane tube 3 are respectively provided with an inlet and an outlet of the electrode solution.

[0047] Specifically, a second overflow port 9 is provided on the upper side of the second liquid storage tank.

[0048] The spraying device 19 includes a nozzle, a third metering pump 31, and a third replenishment tank 30. A third connecting pipe is provided at the bottom of the third replenishment tank 30, and the third metering pump 31 is provided on the third connecting pipe. The nozzle is located at the bottom end of the third connecting pipe, and the spraying direction of the nozzle is aligned with the surface of the anion exchange membrane electrodeposition layer.

[0049] It also includes a manual tension regulating valve 29, which is disposed between the spraying device 19 and the drying device 21 to ensure uniform adhesion of the anion exchange membrane and the polyester film.

[0050] The drying device 21 includes an oven, a heating pack, an exhaust valve and a ventilation valve, an internal circulation valve and a fresh air valve, a lower air inlet valve and a ventilation valve, an upper air inlet valve and a ventilation fan.

[0051] The membranes in the first cathode membrane tube, the second cathode membrane tube, the first anode membrane tube, and the second anode membrane tube are anion exchange membranes.

[0052] The first winding device 22 and the second winding device 24 are respectively equipped with a web guide.

[0053] The specific steps for preparing a monovalent ion-selective anion exchange membrane using the dedicated apparatus of this embodiment are as follows:

[0054] After the anion exchange membrane dry roll is unwound by the first unwinding device, it is immersed in a water tank containing an aqueous sodium chloride solution. After exiting the water tank, it enters a second electrodeposition tank for electrodeposition. The second electrodeposition solution in the second electrodeposition tank is a mixed solution composed of sodium chloride, water, and a polymer containing sulfonic acid groups. During the electrodeposition process, the total organic carbon content in the second electrodeposition solution is monitored in real time by a second online total organic carbon detector and the monitoring results are fed back to the PLC control system (programmable logic controller control system). The PLC control system controls the addition of the second replenishment solution, which is a mixed solution composed of sodium chloride, water, and a polymer containing sulfonic acid groups. The solution is prepared by adding a second replenishment solution with the same sodium chloride concentration as the second electrodeposition solution but a higher concentration of sulfonic acid group-containing polymers. When the total organic carbon content in the second electrodeposition solution drops to 0.9 times the initial value, the second replenishment solution is added to the second electrodeposition tank to replenish the consumed sulfonic acid group-containing polymers. When the total organic carbon content in the second electrodeposition solution reaches 1.1 times the initial value, the second replenishment solution is no longer added. This maintains the total organic carbon content in the second electrodeposition solution in the second electrodeposition tank at a relatively constant level (representing the relatively constant content of sulfonic acid group-containing polymers), thereby achieving uniform electrodeposition of sulfonic acid group-containing polymers onto one surface of the anion exchange membrane.

[0055] After exiting the second electrodeposition tank, the anion exchange membrane enters the first electrodeposition tank for electrodeposition. The first electrodeposition solution in the first electrodeposition tank is a mixed solution composed of sodium chloride, water, and polyethyleneimine (PEI). During the electrodeposition process, the total organic carbon content in the first electrodeposition solution is monitored in real time by a first online total organic carbon detector and the monitoring results are fed back to the PLC control system (programmable logic controller control system). The PLC control system controls the addition of the first replenishment solution, which is also a mixed solution composed of sodium chloride, water, and polyethyleneimine (PEI). The sodium hydroxide concentration is the same as that of the first electrodeposition solution, but the polyethyleneimine concentration is higher. When the total organic carbon content in the first electrodeposition solution is lower than 0.9 times the initial value, the first replenishment solution is added to the first electrodeposition tank to replenish the consumed polyethyleneimine. When the total organic carbon content in the first electrodeposition solution is as high as 1.1 times the initial value, the first replenishment solution is no longer added. This maintains the total organic carbon content in the first electrodeposition solution in the first electrodeposition tank at a basically constant level (representing the basic constant content of polyethyleneimine (PEI)). This achieves uniform electrodeposition of polyethyleneimine onto the surface of the electrodeposition layer of the anion exchange membrane.

[0056] After exiting the first electrodeposition tank, the anion exchange membrane enters a spraying device to spray glutaraldehyde aqueous solution onto the electrodeposition layer surface of the anion exchange membrane. Then, the electrodeposition surface after spraying glutaraldehyde aqueous solution is combined with a polyester film to protect the surface of the anion exchange membrane after spraying glutaraldehyde aqueous solution. Then, it enters a drying device for crosslinking reaction. After exiting the drying device, the polyester film and the anion exchange membrane are separated. The anion exchange membrane is washed with water and then wound up to obtain a monovalent ion selective anion exchange membrane.

[0057] Example 2

[0058] like Figure 2 As shown, this utility model discloses a special apparatus for the continuous preparation of monovalent ion-selective cation exchange membranes, comprising a first unwinding mechanism 1, a water tank 2, a first electrodeposition tank 15, a spraying device 19, a second unwinding mechanism 20, a drying device 21, a first winding device 22, a washing tank 23, and a second winding device 24 arranged sequentially. Rollers are provided between the first unwinding mechanism 1 and the water tank 2, inside the water tank 2, between the water tank 2 and the first electrodeposition tank 15, inside the first electrodeposition tank 15, between the first electrodeposition tank 15 and the spraying device 19, between the spraying device 19 and the drying device 21, between the second unwinding mechanism 20 and the drying device 21, between the drying device 21 and the first winding device 22, inside the washing tank 23, and between the washing tank 23 and the second winding device 24. These rollers are used for conveying the ion exchange membrane dry film and / or polyester film.

[0059] The first unwinding mechanism 1 is used for unwinding the ion exchange membrane dry film;

[0060] The second unwinding mechanism 20 is used for unwinding polyester film;

[0061] The first winding device 22 is used for winding polyester film;

[0062] The second winding device 24 is used to wind up a monovalent ion selective anion exchange membrane;

[0063] The first electrodeposition tank 15 is an electrodeposition tank containing a first electrodeposition solution composed of sodium chloride, water, and polyethyleneimine (PEI); a first replenishment tank (12) is installed above the first electrodeposition tank 15, the bottom of the first replenishment tank 12 is connected to the first electrodeposition tank 15 through a first connecting pipe, and a first metering pump 13 is provided on the first connecting pipe.

[0064] The first electrodeposition tank 15 is provided with a first circulation pipeline 18 for circulating the first electrodeposition liquid in the first electrodeposition tank.

[0065] The first circulation pipeline 18 is equipped with a first total organic carbon online detection and analysis instrument 33. The probe or sampling needle of the first total organic carbon online detection and analysis instrument 33 is set in the first circulation pipeline 18 to monitor the total organic carbon content in the first electrodeposition solution in the first electrodeposition tank 15 in real time.

[0066] The first electrodeposition tank 15 includes a first storage tank, a first cathode membrane tube 11, a first anode membrane tube 14, a first heat exchange device 27, a first heating device 28, and a first pump 16. The first anode membrane tube 14 and the first cathode membrane tube 11 are respectively arranged on the upper and lower parts of the roller in the first storage tank. The lower side of the first storage tank is connected to the inlet of the first storage tank through a first circulation pipeline (18). The first pump 16, the first heat exchange device 27, and the first heating device 28 are provided on the first circulation pipeline 18. The first cathode membrane tube 11 and the first anode membrane tube 14 are respectively connected to the negative electrode and the positive electrode. The first cathode membrane tube 11 and the first anode membrane tube 14 are respectively provided with an inlet and an outlet of the electrode liquid.

[0067] The first liquid storage tank has a first overflow port 17 on its upper side.

[0068] The spraying device 19 includes a nozzle, a third metering pump 31, and a third replenishment tank 30. A third connecting pipe is provided at the bottom of the third replenishment tank 30, and the third metering pump 31 is provided on the third connecting pipe. The nozzle is located at the bottom end of the third connecting pipe, and the spraying direction of the nozzle is aligned with the surface of the anion exchange membrane electrodeposition layer.

[0069] It also includes a manual tension regulating valve 29, which is disposed between the spraying device 19 and the drying device 21 to ensure uniform adhesion of the anion exchange membrane and the polyester film.

[0070] The drying device 21 includes an oven, a heating pack, an exhaust valve and a ventilation valve, an internal circulation valve and a fresh air valve, a lower air inlet valve and a ventilation valve, an upper air inlet valve and a ventilation fan.

[0071] The membranes in the first cathode membrane tube and the first anode membrane tube are anion exchange membranes.

[0072] The first winding device 22 and the second winding device 24 are respectively equipped with a web guide.

[0073] The specific steps for preparing a monovalent ion-selective cation exchange membrane using this invention are as follows:

[0074] After the cation exchange membrane dry film roll is unwound, it is immersed in a water tank containing sodium chloride aqueous solution. After exiting the water tank, it enters the first electrodeposition tank for electrodeposition. The first electrodeposition solution in the first electrodeposition tank consists of sodium chloride, water, and polyethyleneimine (PEI). During the electrodeposition process, the total organic carbon content in the electrodeposition solution is monitored in real time by a first online total organic carbon (TOC) detector, and the monitoring results are fed back to the PLC control system (programmable logic controller control system). The PLC control system controls the addition of replenishing solution, which consists of sodium chloride, water, and polyethyleneimine (PEI). The concentration of sodium chloride in the replenishing solution is the same as that in the electrodeposition solution, but the concentration of polyethyleneimine is higher. That is, when the total organic carbon content in the electrodeposition solution drops to 0.9 times the initial value, replenishing solution is added to the first electrodeposition tank. The replenishing solution is used to replenish the consumed polyethyleneimine (PEI). When the total organic carbon content in the electrodeposition solution reaches 1.1 times the initial value, the replenishing solution is stopped. This maintains the total organic carbon content in the electrodeposition solution in the first electrodeposition tank at a basically constant level (representing the basically constant polyethyleneimine content), thereby achieving uniform electrodeposition of polyethyleneimine (PEI) onto one surface of the cation exchange membrane. After the cation exchange membrane exits the first electrodeposition tank, it enters a spraying device to spray glutaraldehyde aqueous solution onto the electrodeposition layer surface of the cation exchange membrane. Then, the electrodeposition layer surface after spraying glutaraldehyde aqueous solution is combined with a polyester film. Then, it enters a drying device for crosslinking reaction. After exiting the drying device, the polyester film and the cation exchange membrane are separated. The cation exchange membrane is washed with water and then wound up to obtain a monovalent ion selective cation exchange membrane.

[0075] In this invention, the liquid in the water tank is an aqueous solution of sodium chloride, preferably wherein the weight ratio of sodium chloride to water is the same as that in the electrodeposition solution. This step can prevent the sodium chloride concentration in the electrodeposition tank from decreasing due to film formation. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A dedicated apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes, characterized in that, The system includes a first unwinding mechanism (1), a water tank (2), a first electrodeposition tank (15), a spraying device (19), a second unwinding mechanism (20), a drying device (21), a first winding device (22), a washing tank (23), and a second winding device (24), arranged sequentially. Rollers are provided between the first unwinding mechanism (1) and the water tank (2), inside the water tank (2), between the water tank (2) and the first electrodeposition tank (15), inside the first electrodeposition tank (15), between the first electrodeposition tank (15) and the spraying device (19), between the spraying device (19) and the drying device (21), between the second unwinding mechanism (20) and the drying device (21), between the drying device (21) and the first winding device (22), inside the washing tank (23), and between the washing tank (23) and the second winding device (24). These rollers are used for conveying ion exchange membrane dry films and / or polyester films. The first unwinding mechanism (1) is used for unwinding the ion exchange membrane dry film; The second unwinding mechanism (20) is used for unwinding the polyester film; The first winding device (22) is used to wind up the polyester film; The second winding device (24) is used to wind up the monovalent ion selective anion exchange membrane; The first electrodeposition tank (15) is an electrodeposition tank containing a first electrodeposition solution composed of sodium chloride, water and polyethyleneimine (PEI); a first replenishment tank (12) is installed above the first electrodeposition tank (15), the bottom of the first replenishment tank (12) is connected to the first electrodeposition tank (15) through a first connecting pipe, and a first metering pump (13) is provided on the first connecting pipe.

2. The specialized apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes as described in claim 1, characterized in that, It also includes a second electrodeposition tank (7), which is an electrodeposition tank containing a second electrodeposition solution composed of sodium chloride, water and a polymer containing sulfonic acid groups, and the second electrodeposition tank (7) is disposed between the first unwinding mechanism (1) and the first electrodeposition tank (15); A second supply tank (4) is installed above the second electrodeposition tank (7). The bottom of the second supply tank (4) is connected to the second electrodeposition tank (7) through a first connecting pipe, and a second metering pump (5) is installed on the first connecting pipe.

3. The specialized apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes as described in claim 2, characterized in that, The first electrodeposition tank (15) is provided with a first circulation pipeline (18) for circulating the first electrodeposition liquid in the first electrodeposition tank; the second electrodeposition tank (7) is provided with a second circulation pipeline (10) for circulating the second electrodeposition liquid in the second electrodeposition tank.

4. The specialized apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes as described in claim 3, characterized in that, A first total organic carbon online detection and analysis instrument (33) is installed on the first circulation pipeline (18). The probe or sampling needle of the first total organic carbon online detection and analysis instrument (33) is installed in the first circulation pipeline (18) to monitor the total organic carbon content in the first electrodeposition solution in the first electrodeposition tank (15) in real time. A second total organic carbon online detection and analysis instrument (32) is installed on the second circulation pipeline (10). The probe or sampling needle of the second total organic carbon online detection and analysis instrument (32) is installed in the second circulation pipeline (10) to monitor the total organic carbon content in the second electrodeposition solution in the second electrodeposition tank (7) in real time.

5. The specialized apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes as described in claim 3, characterized in that, The first electrodeposition tank (15) includes a first storage tank, a first cathode film tube (11), a first anode film tube (14), a first heat exchange device (27), a first heating device (28), and a first pump (16). The first anode film tube (14) and the first cathode film tube (11) are respectively arranged on the upper and lower parts of the roller in the first storage tank. The lower side of the first storage tank is connected to the inlet of the first storage tank through a first circulation pipeline (18). The first pump (16), the first heat exchange device (27), and the first heating device (28) are provided on the first circulation pipeline (18). The first cathode film tube (11) and the first anode film tube (14) are respectively connected to the negative electrode and the positive electrode. The first cathode film tube (11) and the first anode film tube (14) are respectively provided with the inlet and outlet of the electrode liquid.

6. The specialized apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes as described in claim 5, characterized in that, The first liquid storage tank has a first overflow port (17) on its upper side.

7. The specialized apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes as described in claim 3, characterized in that, The second electrodeposition tank (7) includes a second storage tank, a second cathode membrane tube (6), a second anode membrane tube (3), a second heat exchange device (25), a second heating device (26), and a second pump (8). The second cathode membrane tube (6) and the second anode membrane tube (3) are respectively arranged on the upper and lower parts of the roller in the second storage tank. The lower side of the second storage tank is connected to the inlet of the second storage tank through a second circulation pipeline (10), and the second circulation pipeline (10) is equipped with a second pump (8), a second heat exchange device (25), and a second heating device (26). The second cathode membrane tube (6) and the second anode membrane tube (3) are respectively connected to the negative electrode and the positive electrode. The second cathode membrane tube (6) and the second anode membrane tube (3) are respectively provided with an inlet and an outlet of the electrode liquid.

8. The specialized apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes as described in claim 7, characterized in that, The second liquid storage tank has a second overflow port (9) on its upper side.

9. The specialized apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes as described in claim 1, characterized in that, The spraying device (19) includes a nozzle, a third metering pump (31) and a third replenishment tank (30). A third connecting pipe is provided at the bottom of the third replenishment tank (30), and a third metering pump (31) is provided on the third connecting pipe. The nozzle is located at the bottom of the third connecting pipe and the spraying direction of the nozzle is aligned with the surface of the anion exchange membrane electrodeposition layer.

10. The specialized apparatus for the continuous preparation of monovalent ion-selective ion exchange membranes as described in claim 1, characterized in that, It also includes a manual tension regulating valve (29), which is located between the spraying device (19) and the drying device (21) to ensure that the anion exchange membrane and the polyester film are uniformly bonded.

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