Double-decomposition electrodialysis device for preparing potassium glutamate

Abstract

The utility model relates to a double-decomposition electrodialysis device for preparing potassium glutamate, and belongs to the technical field of electrodialysis. A desalination liquid circulating pump I is connected with a membrane stack desalination liquid I water inlet, and a membrane stack desalination liquid I water outlet is connected with a desalination liquid circulating water tank I water outlet; a desalting liquid tank circulating pump II is connected with a membrane stack desalting liquid II water inlet; a membrane stack desalting liquid II water outlet is connected with a desalting liquid circulating water tank II water outlet; a concentrated solution circulating pump I is connected with a water inlet of a membrane stack concentrated solution I, and a water outlet of the membrane stack concentrated solution I is connected with a water outlet of a concentrated solution circulating water tank I; the concentrated solution circulating pump II is connected with a water inlet of a membrane stack concentrated solution II, and a water outlet of the membrane stack concentrated solution II is connected with a water outlet of the concentrated solution circulating water tank II. According to the utility model, the cost is reduced, the purity is improved, the membrane stack is protected, overhigh load is prevented, and the use requirements are met.

Description

Technical Field

[0001] The utility model relates to an electrodialysis device, in particular to a double decomposition electrodialysis device for preparing potassium glutamate, and belongs to the technical field of electrodialysis. Background Art

[0002] Sodium glutamate (C5H8NaNO4) is well known as a food flavoring (MSG). It is a cheap and common chemical salt in daily life.

[0003] Potassium glutamate (C5H8KNO4) is most commonly used as a food additive, but its more important use is as a pharmaceutical chemical. In medicine, potassium glutamate is mainly used to treat hepatic encephalopathy and severe liver dysfunction caused by high ammonia. In addition, it is used in combination with anti-epileptic drugs to treat mild epileptic seizures and psychomotor epileptic seizures, especially for patients with hypokalemia. It is often used in combination with glutamic acid in clinical practice. These excellent medical effects of potassium glutamate make it have extremely high economic value.

[0004] Electrodialysis (ED) is a new type of membrane separation device developed on the basis of ion exchange membrane technology. It is usually composed of electrodes, anion and cation exchange membranes, partitions and fixing devices. The essence of the electrodialysis device is an electrically driven process. Under the action of an external electric field, the special selectivity of the anion and cation exchange membrane is used to promote the directional migration of anions and cations in the solution, separate and reorganize the ions in the solution, and alternately form concentrated brine chambers and dilute brine chambers in adjacent compartments to achieve the purpose of solution concentration and desalination. At present, electrodialysis devices have been widely used in industrial wastewater treatment, chemical separation and purification, brackish water desalination, biological food processing and other fields. Electrodialysis metathesis (EDM) is based on the electrodialysis device, using different combinations of anion and cation exchange membranes to exchange anions and cations in two salt solutions to form two new salts. As a new type of electrodialysis device, double decomposition electrodialysis device has two desalination chambers and two concentration chambers, which is different from the traditional electrodialysis with only one desalination chamber and one concentration chamber. In recent years, many researchers at home and abroad have applied double decomposition electrodialysis technology to resource recovery, high-salt wastewater treatment, zero pollution discharge and other processes. It has certain advantages in inorganic salt synthesis, industrial wastewater treatment, seawater desalination and other aspects.

[0005] An existing production process of potassium glutamate is produced by strain cultivation and fermentation:

[0006] Firstly, a high-yield strain is selected and inoculated into a culture medium containing raw materials for glutamic acid synthesis for pre-culture.

[0007] After pre-culture, the bacterial liquid is transferred to a large fermentation tank for large-scale fermentation. During the fermentation process, parameters such as fermentation temperature, pH value and oxygen supply should be controlled to ensure the normal growth of the strain and high production of glutamate. After the fermentation is completed, the fermentation liquid should be extracted and purified. First, the bacteria and impurities in the fermentation liquid are separated by centrifugation or filtration. Then, countercurrent extraction or ion exchange techniques are used to convert sodium glutamate into potassium glutamate and separate it from other anions.

[0008] Precautions during the purification process: During the purification process, attention must be paid to recovering useful substances from wastewater and reducing environmental pollution.

[0009] In addition, there is another production process in which fatty acid chloride and sodium glutamate aqueous solution are reacted under the catalysis of potassium hydroxide; the specific steps include:

[0010] Put the fatty acid into the reactor, heat it, and dehydrate it under reduced pressure. Replace the air in the reactor with nitrogen, and add phosphorus trichloride dropwise to the dry fatty acid, and the dropping temperature is controlled at 40-50℃. After the dropping is completed, the temperature is raised to 60℃ for about 6h. Let it stand for stratification and remove the acid layer. Move the upper liquid into a storage tank for use. Add potassium glutamate aqueous solution to the condensation kettle, and add fatty acid chloride dropwise under stirring. The reaction temperature is controlled at 60℃ during the dropping process, and the pH value is adjusted to about 9.5 with potassium hydroxide aqueous solution after the dropping is completed. React at 80℃ for 4-6h. The final pH value is controlled at 8.2-9.0. Cool and the discharge is the product.

[0011] The shortcomings of the prior art are as follows: the traditional potassium glutamate production and preparation process, whether it is a strain fermentation production method or a potassium hydroxide catalytic production method, the process of preparing potassium glutamate is complicated, and the requirements for temperature control are very high. The difference in temperature will affect the purity and output of the potassium glutamate produced, and the energy consumption is very large, resulting in increased costs; secondly, the raw materials needed to be used are very numerous and some are chemicals with higher risks. Whether it is potassium hydroxide or high-yield strains, the price is relatively high. The principles and agents of complex categories also increase the cost of production, and there is leakage of agents and treatment of tail liquid in the production process. The tail liquid belongs to hazardous waste, so the waste generated in its production process has a greater risk of harming the environment. In addition, the process required by the traditional method is cumbersome, the production and preparation units are more, the monomer equipment is larger, the floor area is large, and the power consumption of large-scale production and preparation units is also large; finally, the production cycle of the traditional method is very long, especially the cultivation process of the strain takes a lot of time, and the overall production efficiency is at a low level. Utility Model Content

[0012] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a double decomposition electrodialysis device for preparing potassium glutamate which has a reasonable structural design, is safe and reliable, improves work efficiency, reduces costs, improves purity, protects the membrane stack, and prevents excessive load.

[0013] The technical scheme adopted by the utility model to solve the above-mentioned problem is as follows: the double decomposition electrodialysis device for preparing potassium glutamate comprises a desalting liquid circulating water tank 1, a desalting liquid circulating water tank 2, a concentrated liquid circulating water tank 1 and a concentrated liquid circulating water tank 2, and is characterized in that it also comprises a desalting liquid tank circulating pump 1, a desalting liquid tank circulating pump 2, a concentrated liquid circulating pump 1, a concentrated liquid circulating pump 2, an anolyte tank, a cathode tank, an anolyte circulating pump, a cathode liquid circulating pump and a double decomposition electrodialysis membrane stack, wherein the double decomposition electrodialysis membrane stack is provided with a membrane stack desalting liquid first water inlet, a membrane stack desalting liquid first water outlet, a membrane stack desalting liquid second water inlet, a membrane stack desalting liquid second water outlet, a membrane stack concentrated liquid first water inlet, a membrane stack concentrated liquid first water outlet, a membrane stack concentrated liquid second water inlet and a membrane stack concentrated liquid second water outlet; the membrane stack anode liquid inlet, a membrane stack cathode liquid inlet and a membrane stack anode liquid inlet are respectively provided on the anode side and the cathode side of the double decomposition electrodialysis membrane stack. anode liquid outlet of the membrane stack, cathode liquid inlet of the membrane stack and cathode liquid outlet of the membrane stack; desalination liquid tank circulation pump 1 is connected to desalination liquid 1 inlet of the membrane stack, and desalination liquid 1 outlet of the membrane stack is connected to desalination liquid circulation water tank 1 outlet; desalination liquid tank circulation pump 2 is connected to desalination liquid 2 inlet of the membrane stack, and desalination liquid 2 outlet of the membrane stack is connected to desalination liquid circulation water tank 2 outlet; concentrate circulation pump 1 is connected to concentrate liquid 1 inlet of the membrane stack, and concentrate liquid 1 outlet of the membrane stack is connected to concentrate liquid circulation water tank 1 outlet; concentrate circulation pump 2 is connected to concentrate liquid 2 inlet of the membrane stack, and concentrate liquid 2 outlet of the membrane stack is connected to concentrate liquid circulation water tank 2 outlet; anode liquid circulation pump is connected to anode liquid inlet of the membrane stack, and anode liquid outlet of the membrane stack is connected to anode liquid tank outlet; cathode liquid circulation pump is connected to cathode liquid inlet of the membrane stack, and cathode liquid outlet of the membrane stack is connected to cathode liquid tank outlet.

[0014] Preferably, the desalination liquid tank circulation pump 1 of the utility model is connected to the first water inlet of the membrane stack desalination liquid through a PVC pipe and a rubber hose, and the first water outlet of the membrane stack desalination liquid is connected to the first water outlet of the desalination liquid circulation water tank through a rubber hose, thereby forming a chain passage; the desalination liquid tank circulation pump 2 is connected to the second water inlet of the membrane stack desalination liquid through a PVC pipe and a rubber hose, and the second water outlet of the membrane stack desalination liquid is connected to the second water outlet of the desalination liquid circulation water tank through a rubber hose, thereby forming a chain passage.

[0015] Preferably, the concentrated liquid circulation pump 1 of the utility model is connected to the first water inlet of the membrane stack concentrated liquid through a PVC tube and a rubber hose, and the first water outlet of the membrane stack concentrated liquid is connected to the first water outlet of the concentrated liquid circulation water tank through a rubber hose, thereby forming a chain passage; the concentrated liquid circulation pump 2 is connected to the second water inlet of the membrane stack concentrated liquid through a PVC tube and a rubber hose, and the second water outlet of the membrane stack concentrated liquid is connected to the second water outlet of the concentrated liquid circulation water tank through a rubber hose, thereby forming a chain passage.

[0016] Preferably, the anode liquid circulation pump of the utility model is connected to the anode liquid inlet of the membrane stack through a PVC tube and a hose, and the anode liquid outlet of the membrane stack is connected to the anode liquid tank outlet through a hose, thereby forming a chain passage; the cathode liquid circulation pump is connected to the cathode liquid inlet of the membrane stack through a PVC tube and a hose, and the cathode liquid outlet of the membrane stack is connected to the cathode liquid tank outlet through a hose, thereby forming a chain passage.

[0017] Preferably, the desalting liquid tank circulating pump 1, the desalting liquid tank circulating pump 2, the concentrated liquid circulating pump 1, the concentrated liquid circulating pump 2, the anode liquid circulating pump and the cathode liquid circulating pump of the utility model are each equipped with a corresponding starting switch, and all the circulating pumps are started and closed at the same time.

[0018] Compared with the prior art, the utility model has the following advantages and effects: the overall structure is reasonably designed; electrodialysis double decomposition (EDM) is a new type of electrodialysis system, which is an ingenious combination of electrodialysis and double decomposition principles; under the influence of the direct electric field, the ion exchange membrane selectively allows ions from two feed streams to pass through it into the product stream, where double decomposition reaction occurs to produce new salt; preparing potassium glutamate with double decomposition electrodialysis production system can reduce production energy consumption, and the experimental theoretical calculation of energy consumption is reduced by more than 20%, and the product purity is improved, and the purity can reach more than 99.9%, thereby reducing the purification process, improving production efficiency, reducing production costs, and avoiding membrane pollution to a certain extent, especially controlling the parameters of membrane surface flow rate within a reasonable range, which not only achieves the best salt migration efficiency, but also protects the membrane stack from excessive load. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the system structure of an embodiment of the utility model.

[0020] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure on the left side of the double decomposition electrodialysis membrane stack.

[0021] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure on the right side of the double decomposition electrodialysis membrane stack.

[0022] In the figure: desalting liquid circulating water tank A1, desalting liquid circulating water tank B1, concentrated liquid circulating water tank C1, concentrated liquid circulating water tank D1, desalting liquid tank circulating pump 1, desalting liquid tank circulating pump 2, concentrated liquid circulating pump 1, concentrated liquid circulating pump 2, anolyte tank 5, cathode tank 6, anolyte circulating pump 7, cathode circulating pump 8, double decomposition electrodialysis membrane stack 9; membrane stack desalting liquid inlet 91, membrane stack desalting liquid Liquid outlet 1 92, membrane stack desalted liquid inlet 2 93, membrane stack desalted liquid outlet 2 94, membrane stack concentrated liquid inlet 1 95, membrane stack concentrated liquid outlet 1 96, membrane stack concentrated liquid inlet 2 97, membrane stack concentrated liquid outlet 2 98, membrane stack anode liquid inlet 99, membrane stack anode liquid outlet 100, membrane stack cathode liquid inlet 101, membrane stack cathode liquid outlet 102, anode side Y1, cathode side Y2. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0024] Example

[0025] See also Figure 1-Figure 3 The double decomposition electrodialysis device for preparing potassium glutamate in this embodiment includes a desalting liquid circulating water tank A1, a desalting liquid circulating water tank B1, a concentrated liquid circulating water tank C1, a concentrated liquid circulating water tank D1, a desalting liquid tank circulating pump 1, a desalting liquid tank circulating pump 2, a concentrated liquid circulating pump 1, a concentrated liquid circulating pump 2, an anode liquid tank 5, a cathode liquid tank 6, an anode liquid circulating pump 7, a cathode liquid circulating pump 8 and a double decomposition electrodialysis membrane stack 9.

[0026] In this embodiment, the double decomposition electrodialysis membrane stack 9 is provided with a membrane stack desalting liquid first water inlet 91, a membrane stack desalting liquid first water outlet 92, a membrane stack desalting liquid second water inlet 93, a membrane stack desalting liquid second water outlet 94, a membrane stack concentrated liquid first water inlet 95, a membrane stack concentrated liquid first water outlet 96, a membrane stack concentrated liquid second water inlet 97 and a membrane stack concentrated liquid second water outlet 98.

[0027] In this embodiment, the anode side Y1 and cathode side Y2 of the double decomposition electrodialysis membrane stack 9 are respectively provided with a membrane stack anode liquid inlet 99, a membrane stack anode liquid outlet 100, a membrane stack cathode liquid inlet 101 and a membrane stack cathode liquid outlet 102.

[0028] In this embodiment, the desalting liquid tank circulation pump 1 is connected to the membrane stack desalting liquid 1 water inlet 91 of the double decomposition electrodialysis membrane stack 9 through a PVC tube and a rubber hose, and the membrane stack desalting liquid 1 water outlet 92 is connected to the desalting liquid circulating water tank 1 A1 water outlet through a rubber hose, thereby forming a chain passage; the desalting liquid tank circulation pump 2 is connected to the membrane stack desalting liquid 2 water inlet 93 of the double decomposition electrodialysis membrane stack 9 through a PVC tube and a rubber hose, and the membrane stack desalting liquid 2 water outlet 94 is connected to the desalting liquid circulating water tank 2 B1 water outlet through a rubber hose, thereby forming a chain passage.

[0029] In this embodiment, the concentrated liquid circulation pump 1 3 is connected to the membrane stack concentrated liquid inlet 95 of the double decomposition electrodialysis membrane stack 9 through a PVC tube and a rubber hose, and the membrane stack concentrated liquid outlet 96 is connected to the concentrated liquid circulation water tank C1 outlet through a rubber hose, thereby forming a chain passage; the concentrated liquid circulation pump 2 4 is connected to the membrane stack concentrated liquid second inlet 97 of the double decomposition electrodialysis membrane stack 9 through a PVC tube and a rubber hose, and the membrane stack concentrated liquid second outlet 98 is connected to the concentrated liquid circulation water tank D1 outlet through a rubber hose, thereby forming a chain passage.

[0030] In this embodiment, the anode liquid circulation pump 7 is connected to the membrane stack anode liquid inlet 99 of the double decomposition electrodialysis membrane stack 9 through a PVC tube and a rubber hose, and the membrane stack anode liquid outlet 100 is connected to the anode liquid tank 5 outlet through a rubber hose, thereby forming a chain passage; the cathode liquid circulation pump 8 is connected to the membrane stack cathode liquid inlet 101 of the double decomposition electrodialysis membrane stack 9 through a PVC tube and a rubber hose, and the membrane stack cathode liquid outlet 102 is connected to the cathode liquid tank 6 outlet through a rubber hose, thereby forming a chain passage.

[0031] All circulating pumps in this device are equipped with a corresponding starting switch, and all circulating pumps start and stop at the same time.

[0032] The basic principle of preparing potassium glutamate in the device of this embodiment is to use sodium glutamate (C5H8NaNO4) and potassium sulfate (K2SO4) as raw materials to produce potassium glutamate (C5H8KNO4) and sodium sulfate (Na2SO4) through a double decomposition electrodialysis membrane stack under the action of a DC power supply.

[0033] First, it is necessary to prepare 10% sodium glutamate (C5H8NaNO4) solution and 10% potassium sulfate (K2SO4) solution, and pre-treat the prepared sodium glutamate (C5H8NaNO4) solution and potassium sulfate (K2SO4) solution through a suction filtration device. Under the action of vacuum pressure difference, impurities in the raw materials are removed to make the raw materials purer.

[0034] Then place the filtered sodium glutamate (C5H8NaNO4) solution in the desalting liquid circulating water tank A1, the potassium sulfate (K2SO4) solution in the desalting liquid circulating water tank B1, and add a certain amount of pure water (to meet the basic circulation conditions) to the concentrate circulating water tank C1 and the concentrate circulating water tank D1. At the same time, open the water pump valves of the four water tanks, pump the pure water in the concentrate circulating water tank C1 into channel D, the sodium glutamate solution in the desalting liquid circulating water tank A1 into channel B, the pure water in the concentrate circulating water tank D1 into channel C, and the potassium sulfate (K2SO4) solution in the desalting liquid circulating water tank B1 into channel A. At this time, adjust the pressure and flow rate balance of each pipeline of the entire device. After adjusting to the appropriate value, turn on the DC power supply to apply current to the membrane stack. At this time, K in channel A + Entering into channel B through the cation exchange membrane CEM, the C5H8NO4 in channel B - Through the anion exchange membrane AEM into the path C, at this time C5H8NO4 - and K + The reaction generates potassium glutamate (C5H8KNO4) which flows to the concentrated liquid circulation tank D1; at the same time, Na in path B + The SO4 in path A enters path D through the cation exchange membrane CEM. 2- Through the anion exchange membrane AEM into the channel D, at this time the Na in the channel D + and SO4 2- The reaction generates sodium sulfate (Na2SO4) which flows to the concentrated liquid circulation pump 3. At this point, a group of reactions is completed. In this preparation and production device, every four passages form a group of reaction units. In this preparation and production device, the membrane surface flow rate is required to be controlled at 4cm / s-5cm / s, which is the best. When the membrane surface flow rate is too small, the salt migration will be too slow, the reaction in the membrane stack will be too slow, and the overall efficiency will be low; when the membrane surface flow rate is too fast, the salt migration will be too fast, increasing the load of the membrane stack.

[0035] The potassium glutamate solution produced by the double decomposition electrodialysis preparation production system is then evaporated and crystallized by a rotary evaporator to obtain potassium glutamate crystalline salt. During the evaporation and crystallization process of the rotary evaporator, the initial temperature is first set at 40°C. When the temperature reaches 40°C, observe whether there are bubbles inside the evaporator. If so, keep it at 40°C until there are no bubbles, then raise the temperature to 45°C, and continue to observe whether bubbles are generated. If so, adjust the temperature to the temperature when bubbles are generated; if no bubbles are generated when the temperature reaches 40°C, directly raise the temperature to 45°C to observe whether bubbles are generated. If not, continue to raise the temperature until bubbles appear, and control the temperature at the temperature when bubbles are generated; the entire evaporation and crystallization process is as described above, until the water inside the reactor is almost evaporated, then take out the moist potassium glutamate crystalline salt, and place it in a vacuum culture dish until it is air-dried, cooled and crystallized.

[0036] This embodiment proposes that a double decomposition electrodialysis device be used in the production process of potassium glutamate; proposes that a double decomposition electrodialysis device be used in the production process of potassium glutamate to improve work efficiency, reduce costs, and increase purity; proposes that a double decomposition electrodialysis device be used in the production process of potassium glutamate to control the membrane surface flow rate.

[0037] When potassium glutamate is produced and prepared by the double decomposition electrodialysis device of this embodiment, ions react rapidly under the action of a direct current power supply, thereby greatly improving the preparation efficiency of potassium glutamate. Meanwhile, only two pure raw materials are used in the double decomposition electrodialysis process, and no extra impurities are introduced. Moreover, the selective permeability of the cation and cathode membranes further reduces other ion impurities in the process, thereby fully improving the purity of potassium glutamate, reducing unnecessary waste of resources in the production process of potassium glutamate, reducing the investment and construction cost of potassium glutamate, occupying a smaller area, making the system operation simpler, and having a lower production cost. The double decomposition electrodialysis combined device reduces the purification process, making the production process of potassium glutamate more convenient and efficient.

[0038] Through the above description, those skilled in the art can already implement it.

[0039] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A double decomposition electrodialysis device for preparing potassium glutamate, comprising a desalted liquid circulating water tank 1 (A1), a desalted liquid circulating water tank 2 (B1), a concentrated liquid circulating water tank 1 (C1) and a concentrated liquid circulating water tank 2 (D1), characterized in that: It also includes a desalting liquid tank circulation pump 1 (1), a desalting liquid tank circulation pump 2 (2), a concentrate circulation pump 1 (3), a concentrate circulation pump 2 (4), an anode liquid tank (5), a cathode liquid tank (6), an anode liquid circulation pump (7), a cathode liquid circulation pump (8) and a double decomposition electrodialysis membrane stack (9), wherein the double decomposition electrodialysis membrane stack (9) is provided with a membrane stack desalting liquid first water inlet (91), a membrane stack desalting liquid first water outlet (92), a membrane stack desalting liquid second water inlet (93), a membrane stack desalting liquid second water outlet (94), and a membrane stack desalting liquid second water inlet (95). The membrane stack (9) is provided with a membrane stack anode liquid inlet (99), a membrane stack anode liquid outlet (100), a membrane stack cathode liquid inlet (101) and a membrane stack cathode liquid outlet (102) respectively on the anode side (Y1) and cathode side (Y2) of the double decomposition electrodialysis membrane stack (9); a desalination liquid tank circulation pump (1) is connected to the membrane stack to form a desalination liquid tank. The desalting liquid first water inlet (91) is connected, and the membrane stack desalting liquid first water outlet (92) is connected to the desalting liquid circulating water tank first (A1) outlet; the desalting liquid tank circulating pump second (2) is connected to the membrane stack desalting liquid second water inlet (93), and the membrane stack desalting liquid second water outlet (94) is connected to the desalting liquid circulating water tank second (B1) outlet; the concentrate circulating pump first (3) is connected to the membrane stack concentrate first water inlet (95), and the membrane stack concentrate first water outlet (96) is connected to the concentrate circulating water tank first (C1) outlet The concentrated liquid circulation pump 2 (4) is connected to the concentrated liquid 2 water inlet (97) of the membrane stack, and the concentrated liquid 2 water outlet (98) of the membrane stack is connected to the concentrated liquid circulation water tank 2 (D1) outlet; the anode liquid circulation pump (7) is connected to the anode liquid water inlet (99) of the membrane stack, and the anode liquid water outlet (100) of the membrane stack is connected to the anode liquid tank (5) outlet; the cathode liquid circulation pump (8) is connected to the cathode liquid water inlet (101) of the membrane stack, and the cathode liquid water outlet (102) of the membrane stack is connected to the cathode liquid tank (6) outlet.

2. The double decomposition electrodialysis device for preparing potassium glutamate according to claim 1, characterized in that: The desalting liquid tank circulation pump 1 (1) is connected to the membrane stack desalting liquid 1 water inlet (91) through a PVC pipe and a rubber hose, and the membrane stack desalting liquid 1 water outlet (92) is connected to the desalting liquid circulation water tank 1 (A1) water outlet through a rubber hose, thereby forming a chain passage; the desalting liquid tank circulation pump 2 (2) is connected to the membrane stack desalting liquid 2 water inlet (93) through a PVC pipe and a rubber hose, and the membrane stack desalting liquid 2 water outlet (94) is connected to the desalting liquid circulation water tank 2 (B1) water outlet through a rubber hose, thereby forming a chain passage.

3. The double decomposition electrodialysis device for preparing potassium glutamate according to claim 1, characterized in that: The concentrate circulation pump 1 (3) is connected to the concentrate inlet 1 (95) of the membrane stack through a PVC pipe and a rubber hose, and the concentrate outlet 1 (96) of the membrane stack is connected to the concentrate circulation water tank 1 (C1) outlet through a rubber hose, thereby forming a chain passage; the concentrate circulation pump 2 (4) is connected to the concentrate inlet 2 (97) of the membrane stack through a PVC pipe and a rubber hose, and the concentrate outlet 2 (98) of the membrane stack is connected to the concentrate circulation water tank 2 (D1) outlet through a rubber hose, thereby forming a chain passage.

4. The double decomposition electrodialysis device for preparing potassium glutamate according to claim 1, characterized in that: The anode liquid circulation pump (7) is connected to the anode liquid water inlet (99) of the membrane stack through a PVC pipe and a rubber hose, and the anode liquid water outlet (100) of the membrane stack is connected to the outlet of the anode liquid tank (5) through a rubber hose, thereby forming a chain passage; the cathode liquid circulation pump (8) is connected to the cathode liquid water inlet (101) of the membrane stack through a PVC pipe and a rubber hose, and the cathode liquid water outlet (102) of the membrane stack is connected to the outlet of the cathode liquid tank (6) through a rubber hose, thereby forming a chain passage.

5. The double decomposition electrodialysis device for preparing potassium glutamate according to claim 1, characterized in that: The desalting liquid tank circulation pump 1 (1), the desalting liquid tank circulation pump 2 (2), the concentrated liquid circulation pump 1 (3), the concentrated liquid circulation pump 2 (4), the anode liquid circulation pump (7) and the cathode liquid circulation pump (8) are all equipped with a corresponding starting switch, and all the circulation pumps are started and closed at the same time.

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