A bipolar membrane electrodialysis device

Abstract

The application discloses a bipolar membrane electrodialysis device, which comprises an outer box body and further comprises a liquid inlet mechanism, a plurality of electrodialysis mechanisms and a plurality of filtering mechanisms. The filtering mechanism comprises a filtering box, a driving filtering assembly and a liquid feeding assembly. The driving filtering assembly comprises a motor installed on the top of the filtering box, the output shaft of the motor is fixedly connected with a threaded rod, the outer periphery of the threaded rod is threadedly connected with a filtering plate slidingly connected to the inner wall of the filtering box, and the bottom inner wall of the filtering box is fixedly connected with a plurality of plug rods matched with filtering holes of the filtering plate. Raw water is delivered to the inside of the filtering box through the liquid inlet mechanism, is actively filtered without turbulence through the driving filtering assembly, is delivered to the corresponding electrodialysis mechanism through the liquid feeding assembly and is further subjected to electrodialysis treatment. The filtering plate and other components are arranged to filter out the solid impurities mixed in industrial glucose acid salt, so that the bipolar membrane electrodialysis process and the bipolar membrane body are not affected.

Description

Technical Field

[0001] This invention belongs to the field of electrodialysis technology, and particularly relates to a bipolar membrane electrodialysis device. Background Technology

[0002] Bipolar membranes are a novel type of ion-exchange composite membrane, typically composed of a cation exchange layer (N-type membrane), a hydrophilic interfacial layer (catalytic layer), and an anion exchange layer (P-type membrane), making them true reactive membranes. Under a direct current electric field, bipolar membranes can dissociate water, yielding hydrogen ions and hydroxide ions on either side of the membrane. Utilizing this characteristic, bipolar membrane electrodialysis systems, combining bipolar membranes with other cation and anion exchange membranes, can convert salts in aqueous solutions into their corresponding acids and bases without introducing new components; this method is called bipolar membrane electrodialysis. Bipolar membrane electrodialysis is not only used for preparing acids and bases; when cleverly combined with monopolar membranes, it can achieve multiple functions and be applied in various fields.

[0003] Bipolar membrane electrodialysis is also commonly used to prepare gluconic acid. Bipolar membrane electrodialysis technology converts sodium gluconate into gluconic acid. In the preparation process, gluconolactone is produced through gluconate. However, industrial gluconate often contains some solid impurities. These solid impurities not only affect the electrodialysis process of the bipolar membrane, but also easily cause damage to the bipolar membrane during the liquid loading and unloading process. Summary of the Invention

[0004] To address the problems in the prior art, the present invention proposes the following technical solution:

[0005] A bipolar membrane electrodialysis device includes an outer casing, and further includes:

[0006] Liquid inlet mechanism;

[0007] Multiple electrodialysis facilities;

[0008] Multiple filtration mechanisms are included, comprising a filter box, an active filtration assembly, and a liquid delivery assembly. The active filtration assembly includes a motor mounted on the top of the filter box, with a threaded rod fixedly connected to the motor's output shaft. A filter plate slidably connected to the inner wall of the filter box is threadedly connected to the outer periphery of the threaded rod. Multiple plugs matching the filter holes of the filter plate are fixedly connected to the bottom inner wall of the filter box. Raw water is delivered into the filter box through the liquid inlet mechanism. After being actively filtered without turbulence by the active filtration assembly, the water is delivered to the corresponding electrodialysis unit for further electrodialysis treatment through the liquid delivery assembly.

[0009] The device of this invention can pre-treat and filter out solid impurities doped in industrial gluconate by setting up components such as filter plates, thus preventing them from affecting the bipolar membrane electrodialysis process and the bipolar membrane itself. By setting up components such as motors, threaded rods, and plugging rods, the filter plates can be driven to move from top to bottom for filtration, and the filter holes are blocked by the plugging rods when they reach the bottom, preventing turbulence during liquid discharge from affecting the filtration effect. By setting up a liquid inlet mechanism and multiple sets of corresponding electrodialysis and filtration mechanisms, while one set of electrodialysis and filtration mechanisms is performing liquid inlet, another set is performing precipitation filtration, and so on, which not only further improves the filtration effect, but also ensures uninterrupted operation of electrodialysis and improves the overall production efficiency.

[0010] As a preferred embodiment of the above technical solution, the liquid inlet mechanism includes a multi-port pipe fixedly inserted into the outer wall of the outer casing. Multiple branch ends of the multi-port pipe are respectively connected to the bottom of multiple filter boxes. The converging end of the multi-port pipe extends to the outside of the outer casing and is connected to the raw water conveying pipeline. A first valve is installed on each of the multiple branch ends of the multi-port pipe.

[0011] By setting up a liquid inlet mechanism, liquid can be continuously supplied at the confluence end of the multi-port pipe. The first valve controls the opening and closing of the branch ends. When one branch end is opened, the other branch ends are closed. The liquid supplied to the open branch end is delivered to the corresponding set of electrodialysis and filtration mechanisms. The corresponding filtration mechanisms at the other closed branch ends perform sedimentation and filtration, while also giving the electrodialysis mechanism a certain amount of time to perform the electrodialysis process. This alternation not only further improves the filtration effect but also ensures uninterrupted operation of the electrodialysis work, thereby improving the overall production efficiency.

[0012] As a preferred embodiment of the above technical solution, each of the filter boxes is provided with a cleaning mechanism at its bottom. The cleaning mechanism includes a discharge pipe that is interconnected with the bottom of the filter box, and the end of the discharge pipe away from the filter box extends to the outside of the outer casing. A second valve is installed on each discharge pipe.

[0013] A cleaning mechanism is installed to discharge the remaining impurities and mixture after filtration at the bottom of the filter box, and a second valve is used to control the opening and closing of the discharge pipe.

[0014] As a preferred embodiment of the above technical solution, the electrodialysis device includes an electrodialysis chamber, an electrodialysis assembly is installed inside the electrodialysis chamber, and a drain assembly is installed on the top of the electrodialysis chamber.

[0015] An electrodialysis assembly is installed for bipolar membrane electrodialysis operations, and a drain assembly is installed for draining the liquid from the desalination and concentrate chambers after electrodialysis.

[0016] As a preferred embodiment of the above technical solution, the electrodialysis component includes:

[0017] A cation-coating membrane and an anion-coating membrane are alternately installed inside the electrodialysis chamber;

[0018] An anode plate and a cathode plate are respectively disposed on the two inner side walls of the electrodialysis tank.

[0019] Under the direct current electric field of the anode and cathode plates, ions in the solution migrate in a directional manner. The cation membrane isolates anions through cations, and the anion membrane isolates cations through anions. As a result, some of these chambers form fresh water chambers with few ions, while the chambers adjacent to the fresh water chambers form concentrated water chambers with many ions, thus enabling the separation and concentration of ions.

[0020] As a preferred embodiment of the above technical solution, the cation and anion membranes divide the interior of the electrodialysis tank into multiple chambers, including a desalination chamber and a concentrate chamber. The desalination chambers are interconnected by desalination pipes, and a common desalination manifold is connected to the multiple desalination pipes. The concentrate chambers are interconnected by concentrate pipes, and a common concentrate manifold is connected to the multiple concentrate pipes. A third valve is installed on both the concentrate manifold and the desalination manifold.

[0021] A concentrate collection pipe and a concentrate drain pipe are installed to drain the solution from the concentrate chamber, and a desalination collection pipe and a desalination drain pipe are installed to drain the solution from the desalination chamber.

[0022] As a preferred embodiment of the above technical solution, the liquid delivery assembly includes an infusion pump fixedly installed on the outer wall of the filter box. The input end of the infusion pump is connected to the filter box through a delivery pipe, and the output end of the infusion pump is interconnected with a shunt pipe. Multiple liquid delivery pipes are interconnected on the shunt pipe, and the liquid delivery pipes are respectively connected to the bottom of multiple chambers.

[0023] By setting up a liquid delivery component to transport the filtered solution in the filter box to the electrodialysis tank for further electrodialysis, the liquid delivery pump works to transport the filtered solution inside the filter box to the distribution pipe through the delivery pipe, and after being distributed evenly from multiple liquid delivery pipes to each chamber through the distribution pipe.

[0024] The beneficial effects of this invention are as follows:

[0025] The device of this invention can pre-treat and filter out solid impurities doped in industrial gluconate by setting up components such as filter plates, thus preventing them from affecting the bipolar membrane electrodialysis process and the bipolar membrane itself. By setting up components such as motors, threaded rods, and plugging rods, the filter plates can be driven to move from top to bottom for filtration, and the filter holes are blocked by the plugging rods when they reach the bottom, preventing turbulence during liquid discharge from affecting the filtration effect. By setting up a liquid inlet mechanism and multiple sets of corresponding electrodialysis and filtration mechanisms, while one set of electrodialysis and filtration mechanisms is performing liquid inlet, another set is performing precipitation filtration, and so on, which not only further improves the filtration effect, but also ensures uninterrupted operation of electrodialysis and improves the overall production efficiency. Attached Figure Description

[0026] Figure 1 The diagram shown is a three-dimensional structural schematic of the present invention;

[0027] Figure 2 The diagram shown is a schematic representation of the internal structure of the outer casing in this invention;

[0028] Figure 3 The diagram shown is a schematic representation of the internal structure of the electrodialysis chamber in this invention.

[0029] Figure 4 The diagram shown is a schematic representation of the internal structure of the filter box in this invention.

[0030] Figure Labels

[0031] 10. Outer casing; 20. Liquid inlet mechanism; 21. Multi-port pipe; 22. First valve; 30. Impurity removal mechanism; 31. Impurity discharge pipe; 32. Second valve; 40. Electrodialysis mechanism; 41. Electrodialysis chamber; 42. Concentrate collection pipe; 43. Desalinated water collection pipe; 44. Third valve; 45. Concentrate discharge pipe; 46. Desalinated water discharge pipe; 471. Cation membrane; 472. Anion membrane; 48. Anode plate; 49. Cathode plate; 50. Filtration mechanism; 51. Filter box; 52. Delivery pipe; 53. Infusion pump; 54. Diverter pipe; 55. Liquid delivery pipe; 56. Motor; 57. Threaded rod; 58. Filter plate; 59. Plug rod; 60. First support column; 70. Second support column. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0033] like Figure 2 , Figure 4 As shown, Figure 2 The diagram shown is a schematic representation of the internal structure of the outer casing 10 in this invention. Figure 4 The diagram shown is a schematic representation of the internal structure of the filter box 51 in this invention.

[0034] The bipolar membrane electrodialysis device, including the outer casing 10, also includes: a liquid inlet mechanism 20; multiple electrodialysis units 40; and multiple filtration units 50. Each filtration unit 50 includes a filter box 51, an active filtration assembly, and a liquid delivery assembly. The active filtration assembly includes a motor 56 mounted on the top of the filter box 51. The output shaft of the motor 56 is fixedly connected to a threaded rod 57. The outer periphery of the threaded rod 57 is threadedly connected to a filter plate 58 that is slidably connected to the inner wall of the filter box 51. Multiple plug rods 59 matching the filter holes of the filter plate 58 are fixedly connected to the bottom inner wall of the filter box 51. Raw water is delivered to the inside of the filter box 51 through the liquid inlet mechanism 20. After being actively filtered without turbulence by the active filtration assembly, the water is delivered to the corresponding electrodialysis unit 40 for further electrodialysis treatment through the liquid delivery assembly.

[0035] The device of this invention, by setting up components such as filter plates 58, can pre-filter out solid impurities doped in industrial gluconate, preventing them from affecting the bipolar membrane electrodialysis process and the bipolar membrane itself. By setting up components such as motors 56, threaded rods 57, and plugging rods 59, the filter plates 58 can be driven to move from top to bottom for filtration, and when they reach the bottom, the filter holes are blocked by the plugging rods 59 to prevent turbulence from affecting the filtration effect during liquid discharge. By setting up a liquid inlet mechanism 20 and multiple sets of corresponding electrodialysis mechanisms 40 and filtration mechanisms 50, while one set of electrodialysis mechanisms 40 and filtration mechanisms 50 is feeding liquid, another set is performing precipitation filtration, and so on, which not only further improves the filtration effect, but also ensures uninterrupted operation of electrodialysis and improves the overall production efficiency.

[0036] like Figure 1 As shown, Figure 1 The diagram shown is a three-dimensional structural schematic of the present invention.

[0037] The liquid inlet mechanism 20 includes a multi-port pipe 21 fixedly inserted into the outer wall of the outer casing 10. Multiple branch ends of the multi-port pipe 21 are respectively connected to the bottom of multiple filter boxes 51. The converging end of the multi-port pipe 21 extends to the outside of the outer casing 10 and is connected to the raw water conveying pipeline. A first valve 22 is installed on each of the multiple branch ends of the multi-port pipe 21.

[0038] By setting up the liquid inlet mechanism 20, liquid can be continuously supplied to the converging end of the multi-port pipe 21. The first valve 22 controls the opening and closing of the branch ends. When one branch end is opened, the other branch end is closed. The liquid supplied to the open branch end is delivered to the corresponding set of electrodialysis mechanisms 40 and filtration mechanisms 50. The other closed branch ends are filtered by the corresponding filtration mechanisms 50 for sedimentation and filtration. At the same time, the electrodialysis mechanism 40 is given a certain amount of time to carry out the electrodialysis process. This alternation not only further improves the filtration effect, but also ensures uninterrupted operation of the electrodialysis work and improves the overall production efficiency.

[0039] like Figure 1 , Figure 2 As shown; Figure 1 The diagram shown is a three-dimensional structural schematic of the present invention. Figure 2 The diagram shown is a schematic diagram of the internal structure of the outer casing 10 in this invention.

[0040] Each of the multiple filter boxes 51 is provided with a cleaning mechanism 30 at its bottom. The cleaning mechanism 30 includes a discharge pipe 31 that is interconnected with the bottom of the filter box 51. The end of the discharge pipe 31 that is away from the filter box 51 extends to the outside of the outer casing 10. Each discharge pipe 31 is equipped with a second valve 32.

[0041] The impurity removal mechanism 30 is used to discharge the remaining impurity mixture after filtration at the bottom of the filter box 51, and the second valve 32 is used to control the opening and closing of the impurity discharge pipe 31.

[0042] like Figure 3 As shown, Figure 3 The diagram shown is a schematic diagram of the internal structure of the electrodialysis tank 41 in this invention.

[0043] The electrodialysis unit 40 includes an electrodialysis chamber 41, inside which an electrodialysis assembly is installed, and at the top of the electrodialysis chamber 41 is a drainage assembly. The electrodialysis assembly is used for bipolar membrane electrodialysis operations, and the drainage assembly is used for draining the liquid from the desalination and concentrate chambers after electrodialysis. A second support column 70 is provided at the bottom of the electrodialysis chamber 41 to support it.

[0044] Electrodialysis components include:

[0045] A cation exchange membrane 471 and an anion exchange membrane 472 are alternately installed inside the electrodialysis chamber 41.

[0046] Anode plate 48 and cathode plate 49 are respectively disposed on the two inner side walls of electrodialysis tank 41.

[0047] Under the direct current electric field of the anode plate 48 and the cathode plate 49, ions in the solution migrate in a direction. The cation membrane isolates anions through cations, and the anion membrane isolates cations through anions. As a result, some of these chambers form fresh water chambers with few ions, while the chambers adjacent to the fresh water chambers form concentrated water chambers with many ions, thereby enabling the separation and concentration of ions.

[0048] The cation exchange membrane 471 and anion exchange membrane 472 divide the interior of the electrodialysis chamber 41 into multiple chambers, including a desalination chamber and a concentrate chamber. The desalination chambers are interconnected by desalination pipes 46, and the multiple desalination pipes 46 are connected to a desalination manifold 43. The concentrate chambers are interconnected by concentrate pipes 45, and the multiple concentrate pipes 45 are connected to a concentrate manifold 42. Both the concentrate manifold 42 and the desalination manifold 43 are equipped with a third valve 44.

[0049] A concentrate collection pipe 42 and a concentrate drain pipe 45 are provided for draining the solution in the concentrate chamber, and a desalination collection pipe 43 and a desalination drain pipe 46 are provided for draining the solution in the desalination chamber.

[0050] like Figure 2 As shown, Figure 2 The diagram shown is a schematic diagram of the internal structure of the outer casing 10 in this invention.

[0051] The liquid delivery assembly includes an infusion pump 53 fixedly installed on the outer wall of the filter box 51. The input end of the infusion pump 53 is connected to the filter box 51 through a delivery pipe 52. The output end of the infusion pump 53 is interconnected with a diversion pipe 54. Multiple liquid delivery pipes 55 are interconnected on the diversion pipe 54, and the liquid delivery pipes 55 are respectively connected to the bottom of multiple chambers.

[0052] A liquid delivery assembly is provided to transport the filtered solution in the filter box 51 to the electrodialysis tank 41 for further electrodialysis. The infusion pump 53 operates to transport the filtered solution inside the filter box 51 to the diversion pipe 54 through the delivery pipe 52. After being diverted by the diversion pipe 54, the solution is evenly delivered to each chamber through multiple delivery pipes 55. A first support column 60 is provided at the bottom of the filter box 51 to support the filter box 51.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A bipolar membrane electrodialysis device comprising an outer housing (10), characterized in that, The bipolar membrane electrodialysis device further comprises: a liquid inlet mechanism (20); a plurality of electrodialysis mechanisms (40), each of which comprises an electrodialysis box (41); a plurality of filter mechanisms (50), each of which comprises a filter box (51), a driven filter assembly, and a liquid delivery assembly, the driven filter assembly comprising a motor (56) mounted on the top of the filter box (51), an output shaft of the motor (56) being fixedly connected with a threaded rod (57), the threaded rod (57) being threadedly connected with a filter plate (58) slidably connected to the inner wall of the filter box (51), and the bottom inner wall of the filter box (51) being fixedly connected with a plurality of plug rods (59) matched with filter holes of the filter plate (58), raw water being delivered to the inside of the filter box (51) through the liquid inlet mechanism (20), and the filtered solution being delivered to the corresponding electrodialysis mechanism (40) through the liquid delivery assembly for further electrodialysis treatment after being driven and filtered by the driven filter assembly without turbulence; the filter plate (58) moving downward for filtering, and the filter holes being blocked by the plug rod (59) when the filter plate (58) reaches the bottom, so as to avoid turbulence during liquid outlet and affect the filtering effect; the liquid delivery assembly comprising a liquid delivery pump (53) fixedly mounted on the outer wall of the filter box (51), an input end of the liquid delivery pump (53) being connected with the filter box (51) through a delivery pipe (52), and an output end of the liquid delivery pump (53) being connected with a shunt pipe (54), a plurality of liquid delivery pipes (55) being connected with the shunt pipe (54) in communication, and the liquid delivery pipes (55) being respectively connected with the bottoms of the plurality of chambers in communication; the liquid delivery assembly being used for delivering the filtered solution in the filter box (51) to the electrodialysis box (41) for further electrodialysis, the liquid delivery pump (53) being operated to deliver the filtered solution in the filter box (51) to the shunt pipe (54) through the delivery pipe (52), and the filtered solution being delivered to the chambers through the liquid delivery pipes (55) from the shunt pipe (54) in an even manner.

2. A bipolar membrane electrodialysis device according to claim 1, characterized in that the liquid inlet mechanism (20) comprising a multi-way pipe (21) fixedly inserted into the outer wall of the outer box (10), a plurality of branch ends of the multi-way pipe (21) being respectively connected with the bottoms of the plurality of filter boxes (51), a collection end of the multi-way pipe (21) extending to the outside of the outer box (10) and being connected with a raw water delivery pipeline in communication, and a first valve (22) being mounted on each of the branch ends of the multi-way pipe (21).

3. A bipolar membrane electrodialysis device according to claim 1, characterized in that the bottoms of the plurality of filter boxes (51) being respectively provided with a foreign matter removal mechanism (30), the foreign matter removal mechanism (30) comprising a foreign matter removal pipe (31) connected with the bottom of the filter box (51) in communication, an end of the foreign matter removal pipe (31) away from the filter box (51) extending to the outside of the outer box (10), and a second valve (32) being mounted on the foreign matter removal pipe (31).

4. A bipolar membrane electrodialysis device according to claim 1, characterized in that the inside of the electrodialysis box (41) being provided with an electrodialysis assembly, and the top of the electrodialysis box (41) being provided with a liquid discharge assembly.

5. A bipolar membrane electrodialysis device according to claim 4, characterized in that the electrodialysis assembly comprising: a positive membrane (471) and a negative membrane (472), the positive membrane (471) and the negative membrane (472) being alternately mounted in the inside of the electrodialysis box (41); An anode plate (48) and a cathode plate (49) are arranged on two inner side walls of the electrodialysis box (41) respectively.

6. A bipolar membrane electrodialysis device according to claim 5, characterized in that The anode membrane (471) and the cathode membrane (472) divide the electrodialysis box (41) into multiple chambers, which include fresh water chambers and concentrated water chambers. The fresh water chambers are connected with fresh water discharge pipes (46) in communication, the fresh water discharge pipes (46) are connected with a fresh water collecting pipe (43) in communication, the concentrated water chambers are connected with concentrated water discharge pipes (45) in communication, the concentrated water discharge pipes (45) are connected with a concentrated water collecting pipe (42) in communication, and the concentrated water collecting pipe (42) and the fresh water collecting pipe (43) are provided with third valves (44).

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