CN106268984A - A kind of renovation process of the cation exchange membrane of the polyethyleneimine-modified of inefficacy - Google Patents
A kind of renovation process of the cation exchange membrane of the polyethyleneimine-modified of inefficacy Download PDFInfo
- Publication number
- CN106268984A CN106268984A CN201610791740.0A CN201610791740A CN106268984A CN 106268984 A CN106268984 A CN 106268984A CN 201610791740 A CN201610791740 A CN 201610791740A CN 106268984 A CN106268984 A CN 106268984A
- Authority
- CN
- China
- Prior art keywords
- exchange membrane
- cation exchange
- solution
- concentration
- polymine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/02—Electrolytic coating other than with metals with organic materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
A kind of renovation process of the cation exchange membrane of the polyethyleneimine-modified of inefficacy, including: the cation exchange membrane of the polyethyleneimine-modified of inefficacy is successively immersed in alcoholic solution and dilute sulfuric acid and to do supersonic vibration cleaning treatment by (1), all cleans the solution to remove remained on surface and material with deionized water after cleaning；(2) use electrodeposition process in polymine new in the cation exchange membrane surface electro-deposition that step (1) processes；(3) cation exchange membrane processed through step (2) is immersed in epoxychloropropane aqueous solution, it is chemically crosslinked with epoxychloropropane for cross-linking agent, then wash, so that the cation exchange membrane of the polyethyleneimine-modified lost efficacy recovers its univalent cation selectivity function.The present invention solves film surface and internal contamination that the cation exchange membrane of polyethyleneimine-modified in use causes and the problem that univalent cation selectivity lost efficacy.
Description
Technical field
The present invention relates to the renovation process of the cation exchange membrane of polymine (PEI) modification of a kind of inefficacy.
Background technology
Ion exchange membrane is now widely used in various industrial circle, has the selective cationic membrane of univalent cation by height
Pay attention to.Due to its high amino content of polymine, high reactivity and good film forming characteristics.Wherein, modified with PEI
Cation exchange membrane be widely used in desalinization and water process etc..CN102941026 discloses a kind of by deposition
Method cation exchange basement membrane on introduce functional polymer polymine, and utilize ionic imprinting technique preparation to single sun from
Son has the method for selective ion-exchange composite membranes.But the pollution of film and functional layer damaged be this cation exchange
The realistic problem of one of film existence, not only can destroy ion selectivity, also results in that circulation diminishes, membrane impedance increases.With
Time use during polymine group Monovalent selectivity group by chemical degradation, make film surface lose Monovalent selectivity.This
Phenomenon causes the inefficacy of film function greatly, limits the application of this kind of film, increases the cost in actual application, with
Time it also results in secondary environmental pollution, the wasting of resources and economic loss.
In recent years, carry out many cleanings and be contaminated the research of film.But, lack on ion exchange membrane, recover loss
The research of functional group.Literature search shows, before the present invention completes, find no Monovalent selectivity disabler sun from
Proton exchange Monovalent selectivity function after processing and using electrodeposition process that polymine is deposited over process again is lost
So that its functional rehabilitation regeneration method on the cation exchange membrane of effect.
Summary of the invention
It is an object of the invention to provide the renovation process of the cation exchange membrane of the polyethyleneimine-modified of a kind of inefficacy, to solve
It is in use owing to inorganic compound, macromole or solid matter are on cation exchange membrane surface or film inner accumulation
The film surface caused and internal contamination and cation exchange membrane surface polymine Monovalent selectivity group are by chemical degradation
And the problem causing single cation exchange membrane Monovalent selectivity inefficacy.
It is an object of the invention to be achieved through the following technical solutions:
A kind of renovation process of the cation exchange membrane of the polyethyleneimine-modified of inefficacy, including:
(1) cation exchange membrane of the polyethyleneimine-modified of inefficacy be immersed in alcoholic solution do supersonic vibration cleaning treatment,
Then with deionized water clean with remove remained on surface material, then cation exchange membrane is immersed in dilution heat of sulfuric acid do super
Sonic vibration cleaning treatment, then clean to remove the material of remained on surface with deionized water, the cation exchange obtained after processing
Film is put in pure water and is stored；This step purpose is to remove the polluter on inefficacy film and by the polymine of chemical degradation
(PEI) functional group；
(2) use electrodeposition process in polymine new in the cation exchange membrane surface electro-deposition that step (1) processes；
(3) cation exchange membrane processed through step (2) is immersed in the epoxychloropropane water of volumetric concentration 10%～30%
In solution, it is chemically crosslinked for cross-linking agent with epoxychloropropane, then rinses with water and remove surface crosslinking agent, so that losing efficacy
The cation exchange membrane of polyethyleneimine-modified recover its univalent cation selectivity function.
Heretofore described " cation exchange membrane of the polyethyleneimine-modified of inefficacy " refers to this polyethyleneimine-modified
Cation exchange membrane loses its univalent cation selectivity function being had.
Further, in step (1), described alcoholic solution can be that methanol solution or ethanol solution, methanol solution or ethanol are molten
The volume concentration range of liquid is between 10%～20%.
Further, in step (1), the concentration of described dilution heat of sulfuric acid is between 0.01～0.1M.
Further, in step (1), supersonic frequency is between 40～60kHz, and ultrasonic time is between 2～8 hours.
Further, in step (2), described electrodeposition process particularly as follows: be sequentially placed in electric deposition device anion exchange membrane,
Electric deposition device is separated to form four compartments by the cation exchange membrane after step (1) processes, anion exchange membrane: negative electrode
Room, dense room, light room, anode chamber, wherein the cation exchange membrane after step (1) processes is fixed in the middle of device, with left and right two
The anion exchange membrane of side is separated to form dense room and light room, the anion exchange membrane of both sides the most respectively with wall formed anode chamber and
Cathode chamber, anode chamber is adjacent with light room；Electrodeposition step includes: the mixing adding polymine and NaCl in light room is molten
Liquid, adds NaCl solution, is separately added into Na in cathode chamber and anode chamber in dense room2SO4Solution, energising carries out electro-deposition so that poly-
Aziridine is deposited on cation exchange membrane.
In described electric deposition device, anode and cathode uses conventional electrodes, such as Ti-Ru anode plate and negative electrode steel plate.
Further, in light room add polymine and the mixed solution of NaCl, wherein the concentration of polymine be 2～
10g/L, preferably 10g/L, the concentration of NaCl is 0.2～0.5M, preferably 0.5M.
Further, the concentration of the NaCl solution added in dense room is 0.2～0.5M, preferably 0.5M.
Further, the Na added in electrode chamber2SO4The concentration of solution is 0.2～0.5M, preferably 0.2M.
Further, electrodeposition condition is: face electric current is 10～20mA/cm2, preferably 10mA/cm2, conduction time is 0.5
～1 hour, preferably 0.5 hour.
Further, in step (3), the chemical crosslinking time is 2～8 hours.
The invention has the beneficial effects as follows:
(1) present invention uses electrodeposition process to connect new polyethyleneimine amine groups on film surface, and is chemically crosslinked raising crosslinking
Stability, so that the cation exchange membrane functional rehabilitation regeneration of Monovalent selectivity disabler.
(2) cleaning and the electrodeposition process of contaminated cation exchange membrane are combined by the present invention, significantly improve cation exchange membrane
The recovery of function.
(3) method is simple, can significantly extend the life-span of film, makes the application of functional membrane reach the effect of circulation.
Accompanying drawing explanation
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is polymine electric deposition device schematic diagram of the present invention.
Fig. 2 is the schematic diagram that the present invention carries out that the selective penetrated property of film is measured.
Fig. 3 is that the cation exchange membrane of Monovalent selectivity disabler described in embodiments of the invention 1 processes cation separation effect
Fruit figure.
Fig. 4 is to recover Regeneration Treatment cation at light room concentration change figure through 10g/L PEI crosslinking.
Fig. 5 is to recover Regeneration Treatment cation at light room concentration change figure through 2g/L PEI crosslinking.
Fig. 6 is through 20mA/cm2Face electric current electro-deposition recovers Regeneration Treatment cation at light room concentration change figure.
Fig. 7 recovers Regeneration Treatment cation at light room concentration change figure for not adding cross-linking agent through 2g/L PEI.
Fig. 8 recovers Regeneration Treatment cation at light room concentration change figure for carrying out 10g/L PEI crosslinking without pretreatment.
Detailed description of the invention
With specific embodiment, technical scheme is described further below, but protection scope of the present invention is not limited to
This:
Embodiment 1
To lose ion optionally Japan SELEMION after industrial applicationTMCation exchange membrane is inefficacy film, in 10% first
Alcoholic solution does and soaks and ultrasonic vibration treatment 2h under 60kHz, then soak and under 60kHz in 0.05M dilution heat of sulfuric acid
Ultrasonic vibration treatment 2h, to eliminate on Monovalent selectivity disabler film polluter and by the polymine of chemical degradation
(PEI) functional group, all rinses three times with deionized water after twice supersound process and removes remained on surface solution, then use Fig. 1 institute
The electric deposition device shown carries out electro-deposition.
Cation exchange membrane film to be deposited is fixed on middle, and two auxiliary film are Japan SELEMIONTMAnion exchange
Film.During energising, the both sides of film to be deposited form dense room and light room respectively.Wherein, being light room near the room of anode, opposite side is dense
Room.Light room addition sodium chloride concentration is 0.5mol/L, polymine concentration is the mixed solution of 10g/L, dense indoor addition
The sodium chloride solution of 0.5mol/L, using the metabisulfite solution of 0.2mol/L for the extremely indoor solution as electrolyte, at face electricity
Stream 10mA/cm2The polymine deposition that lower energising completes on film for 0.5 hour；The film that deposited polymine is taken out, uses
Deionized water cleans film surface and is placed in the epoxychloropropane aqueous solution of volumetric concentration 20% crosslinking 2h；Film after crosslinking is used
Ultrapure water removes surface crosslinking agent, so that the cation exchange membrane of Monovalent selectivity disabler selects performance recovery again
Raw.
The differential permeability of film measures such as Fig. 2, and this film is tested in electrodialysis plant, and middle two Room are passed through the chlorine of 2.5g/L
Changing sodium solution and the calcium chloride mixed solution of 2.5g/L, electrode chamber electrolyte is the sodium chloride solution of 0.2mol/L, at 7.65mA/
cm2Run under electric current density, pipette the feed liquid of light room every 10min, measure its Na by cation chromatography+And Ca2+Concentration, altogether
90min..Record a time dependent divalent cation concentration situation of change of inefficacy film and Modified Membrane under the same conditions such as
Fig. 3 and Fig. 4.
Embodiment 2
According to embodiment 1, light room adds sodium chloride concentration be 0.5mol/L, polymine concentration reduce the mixed of most 2g/L
Closing solution, dense indoor are the sodium chloride solution of 0.5mol/L, using the metabisulfite solution of 0.2mol/L for extremely indoor as electrolyte
Solution, be maintained at face electric current 10mA/cm2The polymine deposition that lower energising completes on film for 0.5 hour；To deposited poly-
The film of aziridine takes out, and cleans film surface with deionized water and is placed in the epoxychloropropane aqueous solution of volumetric concentration 20% friendship
Connection 2h；Film ultrapure water after crosslinking is removed surface crosslinking agent, then according to this film of embodiment 1 in electrodialysis plant
Test, Modified Membrane change over a divalent cation concentration situation of change such as Fig. 5.
Embodiment 3
According to embodiment 1, light room adds sodium chloride concentration be 0.5mol/L, polymine concentration be that the mixing of 2g/L is molten
Liquid, dense indoor are the sodium chloride solution of 0.5mol/L, using the metabisulfite solution of 0.2mol/L for extremely indoor molten as electrolyte
Liquid, is adjusted to 20mA/cm by the face electric current of electro-deposition2Lower and the polymine completing on film in 0.5 hour that is energized deposits；
Then the film that deposited polymine is taken out, clean film surface with deionized water and be placed on the epoxy chlorine of volumetric concentration 20%
Propane aqueous solution cross-links 2h；Film ultrapure water after crosslinking is removed surface crosslinking agent, then according to this film of embodiment 1
Electrodialysis plant is tested, Modified Membrane change over a divalent cation concentration situation of change such as Fig. 6.
Comparative example 1
According to embodiment 2, light room adds sodium chloride concentration be 0.5mol/L, polymine concentration be that the mixing of 2g/L is molten
Liquid, dense indoor are the sodium chloride solution of 0.5mol/L, using the metabisulfite solution of 0.2mol/L for extremely indoor molten as electrolyte
Liquid, is maintained at face electric current 10mA/cm2The polymine deposition that lower energising completes on film for 0.5 hour；Polyethylene will be deposited
The film of imines takes out, be placed directly within ultra-pure water after cleaning film surface with deionized water soak stand-by, then should according to embodiment 1
Film is tested in electrodialysis plant, Modified Membrane change over a divalent cation concentration situation of change such as Fig. 7.
Comparative example 2
Ion optionally Japan SELEMION is lost after choosing industrial applicationTMCation exchange membrane is inefficacy film, does not carries out
Pretreatment and directly rinse film surface with deionized water, then use the electric deposition device shown in Fig. 1 to carry out PEI electro-deposition.
Cation exchange membrane film to be deposited is fixed on middle, and two auxiliary film are Japan SELEMIONTMAnion exchange
Film.During energising, the both sides of film to be deposited form dense room and light room respectively.Wherein, being light room near the room of anode, opposite side is dense
Room.Light room addition sodium chloride concentration is 0.5mol/L, polymine concentration is the mixed solution of 10g/L, dense indoor addition
The sodium chloride solution of 0.5mol/L, using the metabisulfite solution of 0.2mol/L for the extremely indoor solution as electrolyte, at face electricity
Stream 10mA/cm2The polymine deposition that lower energising completes on film for 0.5 hour；The film that deposited polymine is taken out, uses
Deionized water cleans film surface and is placed in the epoxychloropropane aqueous solution of volumetric concentration 20% crosslinking 2h；Film after crosslinking is used
Ultrapure water removes surface crosslinking agent, so that the cation exchange membrane of Monovalent selectivity disabler selects performance recovery again
Raw.
The differential permeability of film measures such as Fig. 8, and this film is tested in electrodialysis plant, and middle two Room are passed through the chlorine of 2.5g/L
Changing sodium solution and the calcium chloride mixed solution of 2.5g/L, electrode chamber electrolyte is the sodium chloride solution of 0.2mol/L, at 7.65mA/
cm2Run under electric current density, pipette the feed liquid of light room every 10min, measure its Na by cation chromatography+And Ca2+Concentration, altogether
90min.。
Claims (10)
1. a renovation process for the cation exchange membrane of the polyethyleneimine-modified lost efficacy, including:
(1) cation exchange membrane of the polyethyleneimine-modified of inefficacy be immersed in alcoholic solution do supersonic vibration cleaning treatment,
Then clean to remove the material of remained on surface with deionized water；Again cation exchange membrane is immersed in dilution heat of sulfuric acid do super
Sonic vibration cleaning treatment, then clean to remove the material of remained on surface with deionized water；
(2) use electrodeposition process in polymine new in the cation exchange membrane surface electro-deposition that step (1) processes；
(3) cation exchange membrane processed through step (2) is immersed in the epoxychloropropane water of volumetric concentration 10%～30%
In solution, it is chemically crosslinked for cross-linking agent with epoxychloropropane, then rinses with water and remove surface crosslinking agent, so that losing efficacy
The cation exchange membrane of polyethyleneimine-modified recover its univalent cation selectivity function.
2. renovation process as claimed in claim 1, it is characterised in that: in step (1), described alcoholic solution be methanol solution or
The volume concentration range of person's ethanol solution, methanol solution or ethanol solution is between 10%～20%；Described dilution heat of sulfuric acid
Volumetric concentration is between 5%～15%.
3. renovation process as claimed in claim 1 or 2, it is characterised in that: in step (1), supersonic frequency 40～60kHz it
Between, ultrasonic time is between 6～8 hours.
4. the renovation process as described in one of claims 1 to 3, it is characterised in that: in step (2), described electrodeposition process tool
Body is: be sequentially placed anion exchange membrane, the cation exchange membrane after step (1) processes, anion in electric deposition device
Electric deposition device is separated to form four compartments by exchange membrane: cathode chamber, dense room, light room, anode chamber, wherein processes through step (1)
After cation exchange membrane be fixed in the middle of device, be separated to form dense room and light room with the anion exchange membrane of the left and right sides, two
The anion exchange membrane of side forms anode chamber and cathode chamber with wall the most respectively, and anode chamber is adjacent with light room；Electrodeposition step bag
Include: in light room, add polymine and the mixed solution of NaCl, dense room adds NaCl solution, in cathode chamber and anode chamber
It is separately added into Na2SO4Solution, energising carries out electro-deposition so that polymine is deposited on cation exchange membrane.
5. renovation process as claimed in claim 4, it is characterised in that: the polymine added in light room and the mixing of NaCl
Solution, wherein the concentration of polymine is 2～10g/L, and the concentration of NaCl is 0.2～0.5M；The NaCl added in dense room is molten
The concentration of liquid is 0.2～0.5M.
6. renovation process as claimed in claim 4, it is characterised in that: the Na added in cathode chamber and anode chamber2SO4Solution
Concentration is 0.2～0.5M.
7. renovation process as claimed in claim 5, it is characterised in that: the Na added in cathode chamber and anode chamber2SO4Solution
Concentration is 0.2～0.5M.
8. renovation process as claimed in claim 4, it is characterised in that electrodeposition condition is: face electric current is 10～20mA/cm2,
Conduction time is 0.5～1 hour.
9. renovation process as claimed in claim 4, it is characterised in that: the polymine added in light room and the mixing of NaCl
Solution, wherein the concentration of polymine be the concentration of 10g/L, NaCl be 0.5M；The concentration of the NaCl solution added in dense room
For 0.5M；The Na added in cathode chamber and anode chamber2SO4The concentration of solution is 0.2M；Face electric current is 10mA/cm2, during energising
Between be 0.5 hour.
10. renovation process as claimed in claim 1, it is characterised in that: in step (3), the chemical crosslinking time is 2～8 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610791740.0A CN106268984A (en) | 2016-08-31 | 2016-08-31 | A kind of renovation process of the cation exchange membrane of the polyethyleneimine-modified of inefficacy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610791740.0A CN106268984A (en) | 2016-08-31 | 2016-08-31 | A kind of renovation process of the cation exchange membrane of the polyethyleneimine-modified of inefficacy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106268984A true CN106268984A (en) | 2017-01-04 |
Family
ID=57672953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610791740.0A Pending CN106268984A (en) | 2016-08-31 | 2016-08-31 | A kind of renovation process of the cation exchange membrane of the polyethyleneimine-modified of inefficacy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106268984A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108219170A (en) * | 2017-12-31 | 2018-06-29 | 浙江工业大学 | A kind of preparation and application using the crosslinked PECH/nylon composite anion exchange membranes of PEI |
| CN110918065A (en) * | 2019-11-28 | 2020-03-27 | 浙江工业大学 | Bamboo powder-based ion exchange adsorption material and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102941026A (en) * | 2012-11-30 | 2013-02-27 | 河北工业大学 | Ion exchange composite film with selectivity on single cation |
| CN105655616A (en) * | 2015-12-31 | 2016-06-08 | 浙江工业大学义乌科学技术研究院有限公司 | Method for preparing univalent selective cation exchange membrane by electrodeposition |
-
2016
- 2016-08-31 CN CN201610791740.0A patent/CN106268984A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102941026A (en) * | 2012-11-30 | 2013-02-27 | 河北工业大学 | Ion exchange composite film with selectivity on single cation |
| CN105655616A (en) * | 2015-12-31 | 2016-06-08 | 浙江工业大学义乌科学技术研究院有限公司 | Method for preparing univalent selective cation exchange membrane by electrodeposition |
Non-Patent Citations (1)
| Title |
|---|
| YAN ZHAO,ET.AL.: "Recovery of chemically degraded polyethyleneimine by a re-modification method: prolonging the lifetime of cation exchange membranes", 《RSC ADV.》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108219170A (en) * | 2017-12-31 | 2018-06-29 | 浙江工业大学 | A kind of preparation and application using the crosslinked PECH/nylon composite anion exchange membranes of PEI |
| CN110918065A (en) * | 2019-11-28 | 2020-03-27 | 浙江工业大学 | Bamboo powder-based ion exchange adsorption material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105363353B (en) | A kind of charged type chlorine-containing polymer NF membrane and preparation method thereof | |
| CN105107393B (en) | A kind of preparation method of the selective composite membrane of the monovalention based on template | |
| CN102059056B (en) | Nanofiltration reproduction method of waste reverse osmosis membrane element | |
| CN104868079B (en) | Method for preparing high invasive lithium ion battery diaphragm | |
| CN104548967B (en) | In-situ preparation method for high-selectivity forward osmosis polyamide composite membrane | |
| CN103877872B (en) | A kind of preparation method of nano-material modified polypiperazine-amide nanofiltration membrane | |
| CN108905658B (en) | Method for preparing multivalent ion exchange membrane by membrane pollution-electrodialysis deposition | |
| CN104998560B (en) | A kind of preparation method of the composite membrane containing graphene oxide | |
| CN108017121A (en) | A kind of clean preparation method of diethylamine | |
| CN107930417B (en) | Method for preparing polyvinylidene fluoride hollow fiber forward osmosis membrane by layer-by-layer self-assembly | |
| CN104495991A (en) | Efficient membrane capacitive deionizing array based on flowing electrodes | |
| CN109772177A (en) | A kind of preparation method and application of the modified nanofiltration membrane of graphene oxide | |
| Jeon et al. | Design shape of CDI cell applied with APSf and SPEEK and performance in MCDI | |
| Song et al. | Fabrication of proton permselective composite membrane for electrodialysis-based waste acid reclamation | |
| CN106268984A (en) | A kind of renovation process of the cation exchange membrane of the polyethyleneimine-modified of inefficacy | |
| CN101214976B (en) | Extraction system for preparing salt by concentrating sea water | |
| JP2009231238A (en) | Recycling method for exhaust electrolyte | |
| JP4759781B2 (en) | Monovalent cation selective permeable cation exchange membrane and method for producing the same | |
| Shimizu et al. | Effect of interface structure and amino groups on water splitting and rectification effects in bipolar membranes | |
| Li et al. | Preparation of proton permselective composite membrane and its application in waste acid reclamation by ion substitution electrodialysis | |
| CN205061637U (en) | Based on capacitanc seawater desalination equipment under direct current field effect | |
| CN108479405A (en) | A kind of preparation for the modified anion exchange membrane having both Monovalent selectivity and resistance tocrocking | |
| CN107998900B (en) | Preparation method of anion exchange membrane with single-multivalent selective separation function | |
| Jaroszek et al. | Comparison of the applicability of selected anion-exchange membranes for production of sulfuric acid by electro-electrodialysis | |
| CN205627656U (en) | Efficiency of electrodialysis is improved gather electric field membrane electrodialysis device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170104 |