Bipolar membrane electrodialysis electrolysis device

Abstract

The utility model provides a bipolar membrane electrodialysis electrolysis device, which relates to the technical field of electrodialysis devices, and comprises an electrode group and an electrolysis assembly, and the electrolysis assembly comprises a feed liquid chamber, an acid liquid chamber and an alkali liquid chamber; the feed liquid chamber comprises a first electrolysis chamber and a second electrolysis chamber which are arranged in parallel and separated by a bipolar membrane, and the acid liquid chamber and the alkali liquid chamber are respectively positioned on two sides of the feed liquid chamber; the electrode group comprises an anode plate and a cathode plate; the anode plate and the cathode plate are respectively positioned on two sides of the electrolysis assembly. The bipolar membrane electrodialysis electrolysis device disclosed by the utility model has the beneficial effects that the bipolar membrane of the bipolar membrane electrodialysis electrolysis device can electrolyze water molecules in feed liquid into hydrogen ions and hydroxyl ions under the action of an electric field, and anions in the feed liquid penetrate through the anion exchange membrane to enter the acid liquid chamber, so that an acid solution is formed in the acid liquid chamber; positive ions in the feed liquid penetrate through the cation exchange membrane to enter the alkali liquor chamber, so that an alkali solution is formed in the alkali liquor chamber, and the preparation of the acid solution and the alkali solution is completed. The device is simple in overall structure, convenient to disassemble and assemble and low in equipment cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrodialysis device, concretely to a bipolar membrane electrodialysis electrolytic device. BACKGROUND

[0002] Bipolar membrane is a new type of ion exchange composite membrane, it usually is composed of cation exchange layer (N type membrane), interface hydrophilic layer (catalytic layer) and anion exchange layer (P type membrane), is the truly meaningful reaction membrane, under the action of direct current electric field, bipolar membrane can dissociate water, and hydrogen ion and hydroxyl ion are obtained on the both sides of the membrane respectively. Utilize this characteristic, bipolar membrane electrodialysis method can be used to prepare acid and alkali. With the continuous popularization of bipolar membrane electrodialysis in the field of preparation of acid and alkali, more requirements are put forward to bipolar membrane electrodialysis experimental equipment, and the current bipolar membrane electrodialysis device is usually large in size, high in cost, difficult to miniaturize when preparing acid and alkali, and high in selectivity of ion membrane, which is difficult to be used for small-scale acid and alkali preparation. CONTENT OF UTILITY MODEL

[0003] Therefore, in order to reduce the size of the bipolar membrane electrodialysis electrolytic device, the cost of the device is reduced, the utility model provides a bipolar membrane electrodialysis electrolytic device;Including electrode group and electrolytic assembly, the electrolytic assembly includes liquid chamber, acid liquid chamber and lye chamber;

[0004] The liquid chamber includes the first electrolytic chamber and the second electrolytic chamber arranged side by side, and the bipolar membrane is arranged between the first electrolytic chamber and the second electrolytic chamber,

[0005] The acid liquid chamber and the lye chamber are located on the two sides of the liquid chamber respectively, the acid liquid chamber is adjacent to the first electrolytic chamber, and an anion exchange membrane is arranged between the acid liquid chamber and the first electrolytic chamber;The lye chamber is adjacent to the second electrolytic chamber, and a cation exchange membrane is arranged between the lye chamber and the second electrolytic chamber;

[0006] The electrode group includes anode plate and cathode plate, and the anode plate and the cathode plate are located on the two sides of the electrolytic assembly respectively, wherein the cathode plate is close to the first electrolytic chamber, and the anode plate is close to the second electrolytic chamber;

[0007] The acid liquid chamber, the lye chamber, the first electrolytic chamber and the second electrolytic chamber all include the baffle of frame structure and the sealing membrane fixed on the positive and negative surfaces of the baffle respectively, and all the baffles are arranged side by side.

[0008] Further, the bipolar membrane electrodialysis device further includes a compression plate set, the compression plate set includes two compression plates and a plurality of locking screws, the two compression plates are located on the two sides of the two electrode plates respectively, and the locking screw passes through the two compression plates to lock the compression plates, so that the two compression plates compress and fix the two electrode plates and all the baffles.

[0009] Further, two said compression plates are respectively provided with two electrode holes, and each electrode hole is provided with an electrode rod, and the two electrode rods are respectively connected with the anode plate and the cathode plate.

[0010] Further, the two electrode rods are respectively vertically fixedly connected with the anode plate and the cathode plate.

[0011] Further, the acid liquid chamber and the cathode plate are provided with a first conductive chamber, and the alkali liquid chamber and the anode plate are provided with a second conductive chamber.

[0012] Further, the first conductive chamber and the second conductive chamber are both filled with conductive liquid, and the first conductive chamber and the acid liquid chamber are provided with a conductive diaphragm, and the second conductive chamber and the alkali liquid chamber are provided with a conductive diaphragm.

[0013] Further, the first electrolysis chamber and the second electrolysis chamber are both provided with a feed liquid inlet at the lower end, and are both provided with a feed liquid outlet at the upper end.

[0014] Further, the acid liquid chamber and the alkali liquid chamber are both provided with a liquid inlet, and are both provided with an acid liquid outlet and an alkali liquid outlet at the upper end respectively.

[0015] Further, the feed liquid inlet and the feed liquid outlet are both connected with a feed liquid source through a circulating hose, and a peristaltic pump is further arranged on the circulating hose.

[0016] Further, the diaphragms are all made of acrylic material.

[0017] The bipolar membrane electrodialysis electrolysis device has the advantages that: the device comprises an electrode group and an electrolysis assembly, the electrolysis assembly comprises a feed liquid chamber, an acid liquid chamber and an alkali liquid chamber; the feed liquid chamber comprises first and second electrolysis chambers which are arranged side by side and are separated by a bipolar membrane, the acid liquid chamber and the alkali liquid chamber are respectively located on the two sides of the feed liquid chamber, wherein the acid liquid chamber is adjacent to the first electrolysis chamber, and an anion exchange membrane is arranged between the two; the alkali liquid chamber is adjacent to the second electrolysis chamber, and a cation exchange membrane is arranged between the two; the electrode group comprises an anode plate and a cathode plate, and the anode plate and the cathode plate are respectively located on the two sides of the electrolysis assembly; when the device works, a salt solution is injected into the feed liquid chamber as a reaction feed liquid, the bipolar membrane can electrolyze the feed liquid into hydrogen ions and hydroxyl ions under the action of the electric field of the electrode group, the cations in the feed liquid pass through the anion exchange membrane into the acid liquid chamber, so that an acid solution is formed in the acid liquid chamber, the cations in the feed liquid pass through the cation exchange membrane into the alkali liquid chamber, so that an alkali solution is formed in the alkali liquid chamber, and thus the preparation of the acid and alkali solutions is completed. The device has a simple overall structure, is convenient to disassemble and assemble, is suitable for the preparation of small-volume experimental samples, and has low equipment cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1It is the overall structure schematic diagram of a bipolar membrane electrodialysis electrolytic device.

[0019] Fig. 2 It is the structure schematic diagram of the compression plate of the bipolar membrane electrodialysis electrolytic device.

[0020] In the above figure: 1 - feed liquid chamber, 11 - first electrolytic chamber, 12 - second electrolytic chamber, 13 - feed liquid inlet, feed liquid outlet, 2 - bipolar membrane, 3 - acid liquid chamber, 31 - anion exchange membrane, 4 - alkali liquid chamber, 41 - cation exchange membrane, 5 - conductive chamber, 51 - conductive diaphragm, 6 - compression plate, 61 - compression hole, 62 - electrode hole, 63 - locking screw, 7 - electrode rod, 71 - cathode plate, 72 - anode plate, 8 - sealing membrane. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model embodiments will be further described below with reference to the drawings.

[0022] Please refer to Figs. 1-2 The utility model discloses a bipolar membrane electrodialysis electrolytic device, including electrode group and electrolytic assembly, the electrolytic assembly includes feed liquid chamber 1, acid liquid chamber 3 and alkali liquid chamber 4. Among them, acid liquid chamber 3, feed liquid chamber 1, alkali liquid chamber 4 are arranged in order and parallel.

[0023] The feed liquid chamber 1 includes the first electrolytic chamber 11 and the second electrolytic chamber arranged in parallel, and the bipolar membrane 2 is arranged between the first electrolytic chamber and the second electrolytic chamber 12. The bipolar membrane 2 divides the cavity in the feed liquid chamber 1 into the first electrolytic chamber 11 and the second electrolytic chamber 12. The feed liquid chamber 1 (i.e. the first electrolytic chamber 11 and the second electrolytic chamber 12) is filled with feed liquid. In this embodiment, the feed liquid is sodium chloride solution. It can be understood that the feed liquid can be various. The sodium chloride solution in this embodiment is only an example. The bipolar membrane 2 can electrolyze water molecules in the feed liquid chamber 1 into hydrogen ions and hydroxyl ions under the action of a direct current electric field.

[0024] The acid liquid chamber 3 and the alkali liquid chamber 4 are located on both sides of the feed liquid chamber 1. The acid liquid chamber 3 is adjacent to the first electrolytic chamber 11, and an anion exchange membrane 8 is arranged between the acid liquid chamber 3 and the first electrolytic chamber 11. The alkali liquid chamber 4 is adjacent to the second electrolytic chamber 12, and a cation exchange membrane 41 is arranged between the alkali liquid chamber 4 and the second electrolytic chamber 12. The electrode group includes two electrode plates, which are an anode plate 72 and a cathode plate 71. The anode plate 72 and the cathode plate 71 are located on both sides of the electrolytic assembly. The cathode plate 71 is close to the first electrolytic chamber 11, and the anode plate 72 is close to the second electrolytic chamber. The electrode group is used to provide a direct current electric field. The sealing membrane 8 does not affect the flow of ions in the adjacent chambers, but can prevent direct penetration of water between the adjacent chambers.

[0025] When the bipolar membrane 2 electrodialysis electrolysis device of the present application is working, the hydrogen ions electrolyzed by the bipolar membrane 2 pass through the anion exchange membrane into the acid liquid chamber 3 under the action of the above direct current electric field, and the water in the acid liquid chamber 3 ionizes into hydroxyl ions which pass through the anion exchange membrane 31 into the first electrolysis chamber 11, so that the acid liquid chamber 3 gradually forms a hydrochloric acid solution by gathering the chloride ions and the hydrogen ions; similarly, the sodium ions in the first electrolysis chamber 11 pass through the cation exchange membrane 14 into the alkali liquid chamber 4 under the action of the above direct current electric field, and the hydrogen ions ionized by the water in the alkali liquid chamber 4 pass through the cation exchange membrane 14 into the first electrolysis chamber 11, so that the alkali liquid chamber gradually forms a sodium hydroxide solution by gathering the sodium ions and the hydroxyl ions, thereby the bipolar membrane 2 electrodialysis electrolysis device of the present application can continuously use the feed liquid to prepare acid liquid and alkali liquid.

[0026] In a preferred embodiment, the acid liquid chamber 3, the alkali liquid chamber 4, the first electrolysis chamber 11 and the second electrolysis chamber 12 each include a partition plate with a frame structure and a sealing film 8 fixed on the front and back surfaces of the partition plate, all the partition plates are stacked side by side, and the frames are made of acrylic material, so that the working personnel can observe the reaction in the acid liquid chamber 3, the alkali liquid chamber 4, the first electrolysis chamber and the second electrolysis chamber. The sealing film 8 does not affect the flow of ions in the adjacent chambers, but can prevent direct water penetration between adjacent chambers. This structure can greatly simplify and unify the structure of each chamber in the bipolar membrane electrodialysis electrolysis device, thereby greatly reducing the cost of the electrolysis device.

[0027] In a preferred embodiment, the bipolar membrane electrodialysis electrolysis device further includes a compression plate set, which includes two compression plates 6 and a plurality of locking screws 63. The two compression plates 6 are rectangular plates, and are respectively located on both sides of the two electrode plates. The corners of the two compression plates 6 are provided with compression holes 61, and the compression holes 61 on the two compression plates 6 are aligned with each other. The locking screws 63 pass through the compression holes 61 of the two compression plates 6 which are aligned with each other to lock the compression plates, so that the two compression plates 6 compress and fix the two electrode plates and all the partition plates. The compression plate set can ensure the overall structural strength of the bipolar membrane electrodialysis electrolysis device, and make the structure compact, facilitating the miniaturization of the bipolar membrane electrodialysis electrolysis device.

[0028] In the preferred embodiment, the two said compression plates are provided with electrode holes 62, which are located in the middle of the compression plates, and each of the electrode holes 62 is provided with an electrode rod 7, and the two electrode rods 7 are connected with the anode plate 72 and the cathode plate 71 respectively. The two said electrode rods are vertically fixedly connected with the anode plate 72 and the cathode plate respectively. In the embodiment, the electrode material of the anode plate 72 is titanium plated with ruthenium and iridium, and the electrode material of the cathode plate is stainless steel material, and the electrode rods 7 are all sleeved with nuts, and the part of the electrode rods 7 on the electrode plate which penetrates through the electrode plate is fastened by the nuts. The electrolysis assembly is provided with conductive chambers 5 on both sides, and the two conductive chambers 5 are a first conductive chamber and a second conductive chamber respectively, wherein the first conductive chamber is arranged between the acid liquid chamber 3 and the cathode plate, and the second conductive chamber is arranged between the alkali liquid chamber and the anode plate 72. The first conductive chamber and the second conductive chamber are both filled with conductive liquid, and the solute in the conductive liquid is the same as that in the liquid, and the first conductive chamber and the acid liquid chamber 3 are provided with a conductive diaphragm 51, and the second conductive chamber and the alkali liquid chamber are provided with a conductive diaphragm 51.

[0029] In the preferred embodiment, the lower ends of the first electrolysis chamber 11 and the second electrolysis chamber are provided with liquid inlets 13, and the upper ends of the first electrolysis chamber 11 and the second electrolysis chamber 12 are provided with liquid outlets 14. The acid liquid chamber 3 and the alkali liquid chamber 4 are provided with liquid inlets, and the upper ends of the acid liquid chamber 3 and the alkali liquid chamber 4 are provided with acid liquid outlets and alkali liquid outlets respectively. The liquid inlets and the liquid outlets are connected with a liquid source through circulating hoses, and peristaltic pumps are further arranged on the circulating hoses. The peristaltic pumps can continuously input the liquid in the liquid source into the liquid chamber 1 to supplement the concentration of the sodium chloride solution in the liquid in the liquid chamber 1, so that the acid liquid and the alkali liquid can be continuously prepared; the liquid inlets are used for injecting initial acid liquid and alkali liquid into the acid liquid chamber 3 and the alkali liquid chamber 4, and the acid liquid outlets and the alkali liquid outlets are used for discharging the prepared acid liquid and alkali liquid (wherein the concentration of the initial acid liquid and alkali liquid is less than that of the acid liquid and alkali liquid discharged from the acid liquid outlets and the alkali liquid outlets).

[0030] In this document, the front, back, up, down and other orientation words are defined according to the positions of the parts in the drawings and the positions of the parts relative to each other, only for the purpose of expressing the technical scheme clearly and conveniently. It should be understood that the use of the orientation words should not limit the scope of the application.

[0031] In the case of no conflict, the above-mentioned embodiments and features in the embodiments can be combined with each other.

[0032] The above-mentioned is only the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bipolar membrane electrodialysis electrolysis device; characterized in that, The application relates to an electrode group and an electrolysis assembly, wherein the electrolysis assembly comprises a material liquid chamber, an acid liquid chamber and an alkali liquid chamber. The material liquid chamber comprises a first electrolysis chamber and a second electrolysis chamber arranged side by side, and a bipolar membrane is arranged between the first electrolysis chamber and the second electrolysis chamber. The acid liquid chamber and the alkali liquid chamber are respectively arranged on the two sides of the material liquid chamber, the acid liquid chamber is adjacent to the first electrolysis chamber, and an anion exchange membrane is arranged between the acid liquid chamber and the first electrolysis chamber; the alkali liquid chamber is adjacent to the second electrolysis chamber, and a cation exchange membrane is arranged between the alkali liquid chamber and the second electrolysis chamber. The electrode group comprises an anode plate and a cathode plate, and the anode plate and the cathode plate are respectively arranged on the two sides of the electrolysis assembly, wherein the cathode plate is close to the first electrolysis chamber, and the anode plate is close to the second electrolysis chamber. The acid liquid chamber, the alkali liquid chamber, the first electrolysis chamber and the second electrolysis chamber all comprise a frame structure of a partition plate and sealing membranes fixed on the front and back surfaces of the partition plate, and all the partition plates are arranged side by side.

2. A bipolar membrane electrodialysis electrolysis device according to claim 1; characterized in that, The application further comprises a compression plate group, which comprises two compression plates and a plurality of locking screws, the two compression plates are respectively arranged on the two sides of the two electrode plates, the locking screws pass through the two compression plates and lock the compression plates, so that the two compression plates compress and fix the two electrode plates and all the partition plates.

3. A bipolar membrane electrodialysis electrolysis device according to claim 2; characterized in that, Two electrode holes are respectively arranged on the two compression plates, and an electrode rod is arranged in each electrode hole, and the two electrode rods are respectively connected with the anode plate and the cathode plate.

4. A bipolar membrane electrodialysis electrolysis device according to claim 3; characterized in that, The two electrode rods are respectively vertically fixed on the anode plate and the cathode plate.

5. A bipolar membrane electrodialysis electrolysis device according to claim 1; characterized in that, A first conductive chamber is arranged between the acid liquid chamber and the cathode plate, and a second conductive chamber is arranged between the alkali liquid chamber and the anode plate.

6. A bipolar membrane electrodialysis electrolysis device according to claim 5; characterized in that, Conductive liquid is filled in the first conductive chamber and the second conductive chamber, a conductive diaphragm is arranged between the first conductive chamber and the acid liquid chamber, and a conductive diaphragm is arranged between the second conductive chamber and the alkali liquid chamber.

7. A bipolar membrane electrodialysis electrolysis device according to claim 1; characterized in that, Material liquid inlets are arranged at the lower ends of the first electrolysis chamber and the second electrolysis chamber, and material liquid outlets are arranged at the upper ends of the first electrolysis chamber and the second electrolysis chamber.

8. A bipolar membrane electrodialysis electrolysis device according to claim 7; characterized in that, Liquid inlets are arranged in the acid liquid chamber and the alkali liquid chamber, and acid liquid outlets and alkali liquid outlets are respectively arranged at the upper ends of the acid liquid chamber and the alkali liquid chamber.

9. A bipolar membrane electrodialysis electrolysis device according to claim 7; characterized in that, The material liquid inlets and the material liquid outlets are connected with a material liquid source through circulating hoses, and a peristaltic pump is further arranged on the circulating hoses.

10. A bipolar membrane electrodialysis electrolysis device according to claim 1; characterized in that, The partition plates are all made of acrylic material.

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