CN110510714A - A kind of electrodialysis plant and the method using electrodialysis plant separation alkali and salt - Google Patents
A kind of electrodialysis plant and the method using electrodialysis plant separation alkali and salt Download PDFInfo
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- CN110510714A CN110510714A CN201910793035.8A CN201910793035A CN110510714A CN 110510714 A CN110510714 A CN 110510714A CN 201910793035 A CN201910793035 A CN 201910793035A CN 110510714 A CN110510714 A CN 110510714A
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- 239000003513 alkali Substances 0.000 title claims abstract description 70
- 238000000909 electrodialysis Methods 0.000 title claims abstract description 55
- 150000003839 salts Chemical class 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000000926 separation method Methods 0.000 title claims abstract description 22
- 238000005192 partition Methods 0.000 claims abstract description 68
- 239000012528 membrane Substances 0.000 claims abstract description 62
- 238000005341 cation exchange Methods 0.000 claims abstract description 30
- 239000000243 solution Substances 0.000 claims description 27
- 239000012266 salt solution Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 8
- 238000009938 salting Methods 0.000 claims description 8
- 150000001768 cations Chemical class 0.000 claims description 5
- 239000003518 caustics Substances 0.000 claims description 4
- 230000001351 cycling effect Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 11
- 230000005611 electricity Effects 0.000 abstract description 7
- 238000012546 transfer Methods 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 30
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 13
- 235000011121 sodium hydroxide Nutrition 0.000 description 12
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 4
- 238000000502 dialysis Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000010786 composite waste Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- CJTCBBYSPFAVFL-UHFFFAOYSA-N iridium ruthenium Chemical compound [Ru].[Ir] CJTCBBYSPFAVFL-UHFFFAOYSA-N 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- WBZKQQHYRPRKNJ-UHFFFAOYSA-L disulfite Chemical compound [O-]S(=O)S([O-])(=O)=O WBZKQQHYRPRKNJ-UHFFFAOYSA-L 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electrochemistry (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The present invention provides a kind of electrodialysis plant and using the method for electrodialysis plant separation alkali and salt, it is related to field of resource recovery technique.Electrodialysis plant provided by the invention from left to right, including set gradually anode, anode clapboard, cation-exchange membrane, partition B, several repeat film unit, Bipolar Membrane, partition A, cation-exchange membrane, cathode separator and cathode；From left to right, the film unit includes the Bipolar Membrane set gradually, partition A, cation-exchange membrane and partition B；The back of the Bipolar Membrane is towards the anode.Alkali and salt are separated using electrodialysis plant provided by the invention, separative efficiency is high, and the purity for the alkali isolated and the rate of recovery of alkali significantly improve；Also, Ion transfer is carried out by electricity, it is big to the treating capacity of alkali and salt mixed liquor；In addition, the film close to cathode and anode is set as cation-exchange membrane, Bipolar Membrane can be prevented to be oxidized, to improve the service life of film in electrodialysis plant.
Description
Technical field
The present invention relates to field of resource recovery technique, in particular to a kind of electrodialysis plant and utilize electrodialysis plant
The method for separating alkali and salt.
Background technique
Many industries, such as metallurgy industry, chemical fibre industry, steel industry, electroplating industry can generate big in process of production
The spent caustic solution of the metalline of amount.
The prior art generallys use diffusion dialysis device (DD) separation alkali and salt, but diffusion dialysis device rely primarily on it is dense
Degree difference is separated, and in the application there is many drawbacks, mainly have: (1) concentration for treating treatment fluid is more demanding, only to height
The spent lye of concentration is effective；(2) low efficiency separated；(3) small to the treating capacity of spent lye；(4) treated spent lye is without benefit
Use channel.Therefore, using diffusion dialysis device separation alkali and salt, there are apparent limitations.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of electrodialysis plant and utilizing electrodialysis plant separation alkali and salt
Method.Using electrodialysis plant provided by the invention processing alkali and salt mixed liquor, can for low alkaline concentration mixed liquor into
The separation and recovery of row alkali and salt, and separative efficiency is high, and treating capacity is big, and no spent lye generates.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of electrodialysis plants, from left to right, including set gradually anode, anode clapboard, sun from
Proton exchange, partition B, several repetition film units, Bipolar Membrane, partition A, cation-exchange membrane, cathode separator and cathode；
From left to right, the film unit includes the Bipolar Membrane set gradually, partition A, cation-exchange membrane and partition B；Institute
The back of Bipolar Membrane is stated towards the anode.
Preferably, the number of the film unit is 5~30, and adjacent film unit is to be superposed.
Preferably, the partition A and partition B contain partition runner；The anode clapboard and cathode separator are no stream
Road partition.
Preferably, the anode clapboard and anode constitute anodal compartment；The cathode separator and cathode constitute cathodic compartment；
The partition runner of the partition A is set as alkali and mixed salt solution is cycling in and out runner；The partition stream of the partition B
Road is set as caustic solution circulation disengaging runner.
Preferably, from left to right, the film unit is in turn divided into two compartments；Wherein, the left side of compartment one is double
Pole film, right side are cation-exchange membrane；The left side of compartment two is cation-exchange membrane, and right side is the bipolar of next film unit
Film；Runner of the partition runner of the partition A as compartment one；Runner of the partition runner of the partition B as compartment two.
The present invention provides the methods using the separation alkali and salt of electrodialysis plant described in above scheme, comprising the following steps:
Electrode solution, alkali and mixed salt solution and pure water are each led into the electrodialysis plant, turn on pump beats circulation, in perseverance
Electrodialysis is carried out under voltage conditions, respectively obtains aqueous slkali and salting liquid.
Preferably, the electrode solution is each led into anodal compartment and cathodic compartment；The alkali and mixed salt solution are passed through
In compartment one；The pure water is passed through in compartment two；
The obtained aqueous slkali and salting liquid are flowed out from compartment two and compartment one respectively.
Preferably, the volume ratio of the alkali and mixed salt solution, pure water and electrode solution is 3:(2.0~3.0): (1.5~
2.5)；After turn on pump beats circulation, the flow of the alkali and mixed salt solution, pure water and electrode solution independently is 100~400L/h.
Preferably, the mass concentration of alkali is 1~30% in the alkali and mixed salt solution；The mass concentration of the electrode solution
It is 1~10%.
Preferably, the voltage applied in the electrodialytic process to each film unit is 1.0~3.5V, and current density is
100~900A/m2。
The present invention provides a kind of electrodialysis plants, from left to right, including set gradually anode, anode clapboard, sun from
Proton exchange, partition B, several repetition film units, Bipolar Membrane, partition A, cation-exchange membrane, cathode separator and cathode；From a left side to
The right side, the film unit include the Bipolar Membrane set gradually, partition A, cation-exchange membrane and partition B；The back of the Bipolar Membrane
Towards the anode.Under the action of electric field, cation permeable cation-exchange membrane in alkali and mixed salt solution is toward cathode side
To movement, alkali is formed in conjunction with the hydroxide ion that water is dissociateed by Bipolar Membrane；And the hydroxyl in alkali and mixed salt solution
Ion and water are neutralized by the hydrogen ion that Bipolar Membrane dissociates, to realize the separation of alkali and salt.Using electricity provided by the invention
Electrodialysis apparatus separates alkali and salt, and separative efficiency is high, and the purity for the alkali isolated and the rate of recovery of alkali significantly improve；Also,
Ion transfer is carried out by electricity, it is big to the treating capacity of alkali and salt mixed liquor；In addition, the film close to cathode and anode is set as cation
Exchange membrane can prevent Bipolar Membrane to be oxidized, to improve the service life of film in electrodialysis plant.Further, the present invention mentions
The electrodialysis plant of confession can carry out the separation and recovery of alkali and salt for the mixed liquor of low alkaline concentration, treat the concentration requirement for the treatment of fluid
It significantly reduces.Therefore, electrodialysis plant provided by the invention can be efficiently used for the separation of alkali and salt.Embodiment the result shows that,
Carry out the separation of alkali and salt using electrodialysis plant provided by the invention, the purity of the alkali isolated up to 99% or more, alkali
The rate of recovery is up to 98% or more.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of electrodialysis plant provided by the invention, wherein 1 is anode, and 2 be anode clapboard, and 3 are
Cathode, 4 be cathode separator, and 5 be cation-exchange membrane, and 6 be partition B, and 7 be Bipolar Membrane, and 8 be partition A；
Fig. 2 is the schematic illustration that electrodialysis plant provided by the invention separates alkali and salt.
Specific embodiment
The present invention provides a kind of electrodialysis plants, from left to right, including set gradually anode, anode clapboard, sun from
Proton exchange, partition B, several repetition film units, Bipolar Membrane, partition A, cation-exchange membrane, cathode separator and cathode；
From left to right, the film unit includes the Bipolar Membrane set gradually, partition A, cation-exchange membrane and partition B；Institute
The back of Bipolar Membrane is stated towards the anode.
The structural schematic diagram of electrodialysis plant provided by the invention is as shown in Figure 1, wherein and 1 is anode, and 2 be anode clapboard,
3 be cathode, and 4 be cathode separator, and 5 be cation-exchange membrane, and 6 be partition B, and 7 be Bipolar Membrane, and 8 be partition A.
In invention, the film close to cathode and anode is set as cation-exchange membrane, Bipolar Membrane can be prevented to be oxidized, thus
Improve the service life of film in electrodialysis plant.
In the present invention, the number of the film unit is preferably 5~30；The number of the film unit can be according to practical need
It to be increased and decreased with plant bulk.In the present invention, adjacent film unit is to be superposed, i.e., is continuously to arrange between film unit
, by taking 2 film units as an example, the form of superposition is Bipolar Membrane-partition A- cation-exchange membrane-partition B- Bipolar Membrane-partition
A- cation-exchange membrane-partition B.
In the present invention, the partition A and partition B preferably contains partition runner；The anode clapboard and cathode separator
It is preferably all no port plate.In the present invention, the anode clapboard and anode preferably comprise anodal compartment；The cathode separator
Cathodic compartment is preferably comprised with cathode.In the present invention, the partition runner of the partition A is set as alkali and mixed salt solution circulation
Pass in and out runner；The partition runner of the partition B is set as caustic solution circulation disengaging runner.
In the present invention, from left to right, several film units being arranged under the overlay preferably are in turn divided into two compartments；Wherein,
The left side of compartment one is Bipolar Membrane, and right side is cation-exchange membrane；The left side of compartment two is cation-exchange membrane, under right side is
The Bipolar Membrane of one film unit, and so on.In the present invention, from left to right, close to the cation-exchange membrane and first of anode
The Bipolar Membrane of a film unit constitutes compartment two；The cation-exchange membrane of the last one film unit with later Bipolar Membrane (i.e. near
The Bipolar Membrane of nearly cathode) and composition compartment two and compartment one between the cation-exchange membrane of cathode.In the present invention, described
Runner of the partition runner of partition A as compartment one；Runner of the partition runner of the partition B as compartment two.
There is no particular limitation for specific type and size of the present invention to the Bipolar Membrane and cation-exchange membrane, uses
Bipolar Membrane well known in the art and cation-exchange membrane.In the specific embodiment of the invention, the Bipolar Membrane and cation
The size of exchange membrane is specially 200mm × 400mm, and the effective area of single film is 0.0527m2。
The present invention does not have special restriction to the specific type and size of the anode, cathode and partition, using ability
Anode, cathode known to domain and partition.In the specific embodiment of the invention, the cathode and anode are that titanium applies ruthenium iridium electricity
Pole；The material of the partition be polypropylene, the partition with a thickness of 0.07cm, effective width 17cm.
The present invention provides the methods using the separation alkali and salt of electrodialysis plant described in above scheme, comprising the following steps:
Electrode solution, alkali and mixed salt solution and pure water are each led into the electrodialysis plant, turn on pump beats circulation, in perseverance
Electrodialysis is carried out under voltage conditions, respectively obtains aqueous slkali and salting liquid.
In the present invention, the electrode solution is preferably each led into anodal compartment and cathodic compartment；The alkali and salt mixing
Solution is passed through in compartment one；The pure water is passed through in compartment two；The obtained aqueous slkali and salting liquid are respectively from two He of compartment
Compartment one flows out.
In the present invention, the volume ratio of the alkali and mixed salt solution, pure water and electrode solution is preferably 3:(2.0~3.0):
(1.5~2.5), more preferably 3:2:2.In the present invention, after turn on pump beats circulation, the alkali and mixed salt solution, pure water and electricity
The flow of pole liquid is preferably independently 100~400L/h, more preferably 150L/h.In the present invention, the alkali and salt mixing are molten
The mass concentration of alkali is preferably 1~30% in liquid；The mass concentration of the electrode solution is preferably 1~10%.In the present invention, institute
State the alkali that alkali is preferably hydroxide form.The present invention does not have special restriction to the source of the alkali and mixed salt solution, adopts
With source well known in the art；The present invention can carry out the separation and recovery of alkali and salt for the mixed liquor of low alkaline concentration, treat
The concentration for the treatment of fluid requires to significantly reduce.The present invention does not require the electrode solution particularly, using electricity well known in the art
Pole liquid, in the specific embodiment of the invention, the electrode solution is sodium hydroxide solution.
In the present invention, the voltage applied in the electrodialytic process to each film unit is preferably 1.0~3.5V, more excellent
It is selected as 1.5~2.0V；Current density is preferably 100~900A/m2, more preferably 300~500A/m2.The present invention is for the electricity
The time of dialysis does not have special restriction, in actual process, according to the number and processing capacity of film unit, guarantees final
It can obtain satisfactory target product.In electrodialytic specific implementation process, the present invention is further preferably by alkali
It is monitored in real time with the pH of salt side to control electrodialytic reaction process, to control the separation process of alkali and salt；With anti-
The progress answered, separating when the pH in compartment one is dropped between 7~13 can terminate.
Using the schematic illustration of electrodialysis plant provided by the invention separation alkali and salt as shown in Fig. 2, under initial situation,
It is passed through alkali and mixed salt solution into compartment one, pure water is passed through into compartment two, turn on pump beats circulation, when each solution is in required flow
After stablizing circulation in range, constant voltage is applied to the electrodialysis plant and carries out electrodialysis.Under the action of electric field, alkali and salt are mixed
The cation permeable cation-exchange membrane closed in solution is mobile toward cathode direction, the hydroxyl dissociateed with water by Bipolar Membrane from
Son, which combines, forms alkali from the outflow of compartment two；And what the hydroxide ion and water in alkali and mixed salt solution were dissociateed by Bipolar Membrane
Hydrogen ion neutralizes, and salting liquid is then flowed out from compartment one, to realize the separation of alkali and salt；The aqueous slkali and salting liquid isolated can
Alkali product and product salt are further finally obtained by evaporation process.Alkali and salt are carried out using electrodialysis plant provided by the invention
Separation, the purity of the alkali isolated is up to 99% or more, and for the rate of recovery of alkali up to 98% or more, separative efficiency is high, almost without
Spent lye generates.
To electrodialysis plant provided by the invention and the side of electrodialysis plant separation alkali and salt is utilized below with reference to embodiment
Method is described in detail, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
Separating experiment, the electrodialysis plant are carried out using electrodialysis plant provided by the invention (structure is as shown in Figure 1)
In include 8 film units, specification 200mm × 400mm of film, the effective area of single film is 0.0527m2, 8 film units it is total
Effective area is 0.4216m2；Block board thickness is 0.07cm, and partition effective width is 17cm, and the material of partition is polypropylene material
Material；Cathode and anode are that titanium applies ruthenium iridium electrode；Catholyte and anolyte are the sodium hydroxide solution that concentration is 0.5mol/L.
It will be that 5% sodium hydroxide and 1% sodium sulphate composite waste 3L are passed through electric osmose by pretreated mass content
In the compartment one of analysis apparatus, pure water 3L is passed through in compartment two, turn on pump beats circulation, and the flow for controlling each liquid stream is 120L/h；Work as stream
After amount is stablized, applies constant voltage 20V and carry out electrodialysis 30min；After the completion of electrodialysis, one output of compartment of the electrodialysis plant
Metabisulfite solution, two output sodium hydroxide solution of compartment finally obtain the separation product of alkali and salt then through evaporation process.
The voltage that each film unit of this example can be calculated according to experimental data and detection data is 1.80V, and electric current is close
Degree is 400A/m2, target product sodium hydrate content is 4.5%, and the rate of recovery of purity 99.2%, sodium hydroxide is
98.5%, sodium sulphate content 1.1%, current efficiency 70%, the energy consumption of output sodium hydroxide per ton is 2100 kilowatt hours.
Embodiment 2
Carry out electrodialysis according to the step of embodiment 1, by by pretreated mass content be 10% potassium hydroxide and
2% potassium chloride composite waste 3L is passed through compartment one, and compartment two is passed through 3L pure water, and the electrodialysis time is 50min；Electrodialysis is completed
Afterwards, the one output Klorvess Liquid of compartment of the electrodialysis plant, two output potassium hydroxide solution of compartment, then through evaporated
Reason, finally obtains the separation product of alkali and salt.
The voltage that each film unit of this example can be calculated according to experimental data and detection data is 1.92V, and electric current is close
Degree is 425A/m2, target product potassium hydroxide content is 7.5%, and the rate of recovery of purity 99.1%, potassium hydroxide is
99.1%, KCE content 2.3%, current efficiency 75%, the energy consumption of output potassium hydroxide per ton is 1450 kilowatt hours.
The present invention is the above is only a preferred embodiment of the present invention, it is noted that for the common of the art
For technical staff, various improvements and modifications may be made without departing from the principle of the present invention, these are improved and profit
Decorations also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of electrodialysis plant, which is characterized in that from left to right, anode, anode clapboard, cation including setting gradually are handed over
Change film, partition B, several repetition film units, Bipolar Membrane, partition A, cation-exchange membrane, cathode separator and cathode；
From left to right, the film unit includes the Bipolar Membrane set gradually, partition A, cation-exchange membrane and partition B；It is described double
The back of pole film is towards the anode.
2. electrodialysis plant according to claim 1, which is characterized in that the number of the film unit is 5~30, adjacent
Film unit is to be superposed.
3. electrodialysis plant according to claim 1, which is characterized in that the partition A and partition B contain partition stream
Road；The anode clapboard and cathode separator are no port plate.
4. electrodialysis plant according to claim 1 or 3, which is characterized in that the anode clapboard and anode constitute anode
Compartment；The cathode separator and cathode constitute cathodic compartment；
The partition runner of the partition A is set as alkali and mixed salt solution is cycling in and out runner；The partition runner of the partition B is set
It is set to caustic solution circulation disengaging runner.
5. electrodialysis plant according to claim 4, which is characterized in that from left to right, the film unit is in turn divided into
Two compartments；Wherein, the left side of compartment one is Bipolar Membrane, and right side is cation-exchange membrane；The left side of compartment two is that cation is handed over
Film is changed, right side is Bipolar Membrane；Runner of the partition runner of the partition A as compartment one；The partition runner conduct of the partition B
The runner of compartment two.
6. utilizing the method for the separation alkali and salt of electrodialysis plant described in 5 any one of Claims 1 to 5, which is characterized in that including
Following steps:
Electrode solution, alkali and mixed salt solution and pure water are each led into the electrodialysis plant, turn on pump beats circulation, in constant voltage
Under the conditions of carry out electrodialysis, respectively obtain aqueous slkali and salting liquid.
7. according to the method described in claim 6, it is characterized in that, the electrode solution each leads into anodal compartment and cathodic compartment
In；The alkali and mixed salt solution are passed through in compartment one；The pure water is passed through in compartment two；
The obtained aqueous slkali and salting liquid are flowed out from compartment two and compartment one respectively.
8. method according to claim 6 or 7, which is characterized in that the alkali and mixed salt solution, pure water and electrode solution
Volume ratio is 3:(2.0~3.0): (1.5~2.5)；After turn on pump beats circulation, the alkali and mixed salt solution, pure water and electrode solution
Flow independently be 100~400L/h.
9. according to the method described in claim 8, it is characterized in that, the mass concentration of alkali is 1 in the alkali and mixed salt solution
~30%；The mass concentration of the electrode solution is 1~10%.
10. according to the method described in claim 6, it is characterized in that, to the application of each film unit in the electrodialytic process
Voltage is 1.0~3.5V, and current density is 100~900A/m2。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113023750A (en) * | 2021-03-09 | 2021-06-25 | 河北工业大学 | Device and method for producing sodium hydroxide by electrodialysis |
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