CN109908976A - A kind of electrically regenerative H-type cation bed failure cation exchange resin method of Bipolar Membrane method - Google Patents
A kind of electrically regenerative H-type cation bed failure cation exchange resin method of Bipolar Membrane method Download PDFInfo
- Publication number
- CN109908976A CN109908976A CN201711313312.8A CN201711313312A CN109908976A CN 109908976 A CN109908976 A CN 109908976A CN 201711313312 A CN201711313312 A CN 201711313312A CN 109908976 A CN109908976 A CN 109908976A
- Authority
- CN
- China
- Prior art keywords
- exchange resin
- regeneration
- bipolar membrane
- cation
- cation bed
- 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.)
- Withdrawn
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The present invention relates to a kind of methods of the electrically regenerative H-type cation bed failure cation exchange resin of Bipolar Membrane method, it is made of following steps: preparing weak brine, prepares diluted acid regenerated liquid, recoil, regeneration and cleaning.H-type cation bed failure cation exchange resin regenerates mass percentage concentration≤8% of used diluted acid regenerated liquid.The present invention, which has been started, is lauched dissociation according to DC electric field effect, the technique of regeneration H-type cation bed failure cation exchange resin acid solution is made by salt water with bipolar membrane electrodialysis device, replaces outsourcing acid solution with it to regenerate the chemical regeneration traditional handicraft of H-type cation bed failure cation exchange resin.The regeneration level for improving H-type cation bed failure cation exchange resin eliminates regeneration acid solution storing link, and H-type cation bed failure cation exchange resin regenerative operation is more convenient, improves level of security, environmentally friendly.
Description
Technical field
The present invention relates to the methods that inactive ion exchange resin is regenerated in ion-exchange process.
Background technique
Ion exchange technique is led in petrochemical industry, light industry, food, medicine, metallurgy, atomic energy, electric power and environmental protection etc.
Domain is related to the various aspects of national economy and people's lives, is widely used.By taking thermal power plant as an example, pot is prepared
Furnace make-up water and condensate polishing treatment, in addition to all can't do without adopting with other than various advanced physical chemistry processing and various membrane technologies
With On Water Treatment Technique By Ion-exchange Process, various ion-exchange units, such as cation bed, anion bed, mixed bed must be just used.These ions
Switching equipment is all filled with ion exchange resin, and ion exchange resin will be regenerated after equipment operation processing water fails
Operation makes inactive ion exchange resin restore ion exchanging function.Inactive ion exchange resin is carried out with chemical agent acid or alkali
Regeneration, this regeneration method is referred to as soda acid chemical regeneration method.
There is many defects for the soda acid chemical regeneration method of inactive ion exchange resin, and such as regeneration is low with soda acid utilization rate,
Spent acid lye exhaust emission environment, regenerative operation is complicated, and soda acid is by as hazardous chemical, it should be noted that safety storing, labour item
Part is also bad, and therefore, there is an urgent need to develop a kind of new methods of ion exchange resin regeneration by people.
In recent years, we are researching and developing always electric regeneration of ion exchange resin technology, open up and extend Bipolar Membrane
The electrically regenerative technology of method, it is electrically regenerative electrically regenerative to multiple bed ion exchange resin from Ion Exchange Resin In The Mixing Bed, especially H-type cation bed from
Sub-exchange resin is electrically regenerative.
H-type cation bed often forms multiple bed with OH type anion bed and carries out ion exchange desalination in addition to for chemical industry and pharmacy procedure
Processing.The principle of this ion exchange desalting processing is to be to become salt with H+The acid of ion, then use OH
Type anion bed ion exchange resin removes acid group, and H+And OH-Ions binding and the purpose for obtaining desalination.
In recent years, the technology of domestic Bipolar Membrane and the related diaphragm of preparation reaches its maturity, and is to promote to use Bipolar Membrane method ion
Exchanger resin is electrically regenerative to create advantage.
The purpose of the present invention is provide one kind in direct current for deficiency and defect existing for existing ion exchange technique
Sig water and diluted acid regenerated liquid are prepared with Bipolar Membrane method under field action, with diluted acid regenerated liquid regeneration H-type cation bed failure ion exchange
Resin realizes the purpose of electric regeneration of ion exchange resin.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind need not outsourcing acid, voluntarily relieving haperacidity, with low concentration acid regeneration
Liquid, safe ready is environmentally friendly, electrically regenerative H-type cation bed failure cation exchange resin method.
Since traditional H-type cation bed inactive ion exchange resin regeneration technology has acid regeneration liquid utilization rate low, waste regeneration liquid
Exhaust emission environment, regenerative operation are complicated, and acid solution is by as a kind of dangerous chemicals, it should be noted that safety storing, working condition
Many defects such as bad.
A kind of method of the electrically regenerative H-type cation bed failure cation exchange resin of Bipolar Membrane method, this method comprises the following steps:
(1) it prepares weak brine: before the regeneration of H-type cation bed, weak brine should be prepared, weak brine adds salt to be made by pure water, to adjust
Salinity is saved to setting value, the obtained weak brine up to concentration setpoint is stored in weak brine tank；
(2) it prepares diluted acid regenerated liquid: while off-the-line, starting bipolar membrane electrodialysis device, in direct current in the failure of H-type cation bed
Under electric field action, bipolar membrane electrodialysis device is by water power from for H+And OH-Ion, they respectively with the salt ion knot in weak brine
It closes, diluted acid regenerated liquid and sig water is directly made by weak brine, obtained diluted acid regenerated liquid is sent into hold-up tank, for regenerating resin
When use；It is used for other purposes that obtained sig water is sent into hold-up tank；
(3) it recoils: failing after off-the-line in H-type cation bed, recoiled by cation bed bottom into pure water, wash away cation exchange resin
Smalls and dirt in layer；
(4) it regenerates: by obtained diluted acid regenerated liquid, being sent into failure cation bed from hold-up tank.It is regenerated by concurrent, then diluted acid is again
Raw liquid crosses cation bed cation exchange resin layer from top to bottom；By counter-current regeneration, then diluted acid regenerated liquid flows through cation bed sun from bottom to top
Ion exchange resin layer；
(5) it cleans: for remaining regenerated liquid and regeneration product in Scavenger resin layer, after regeneration, being cleaned using pure water, clearly
It is washed till until effluent quality complies with standard.
Weak brine described in step (1) adds the pure salt of chemistry to be made by pure water, and the salt is sodium chloride, sodium sulphate, chlorination
One of ammonium or ammonium sulfate.
Mass percentage concentration≤8% of diluted acid regenerated liquid described in step (2).
Bipolar Membrane is that side is anode membrane and the other side is cavity block, is sandwiched between the composite membrane of catalyst layer.From microcosmic angle
It observes, the catalyst layer among Bipolar Membrane can constantly absorb water, and under DC electric field effect, make water decomposition
The resulting H of water decomposition+Cation dissociates resulting anion X with salt MX-It is combined into sour HX, the resulting anion OH of water decomposition-With
Salt MX dissociates resulting cation M+It is combined into alkali MOH.These generated soda acids are collected, it is spare.
Bipolar membrane electrodialysis device 3 occurs water decomposition reaction, reacts dilute salting liquid under external dc power supply effect, raw
At sig water and diluted acid regenerated liquid, sig water and diluted acid regenerated liquid are respectively fed to diluted alkaline flow container and diluted acid regenerated liquid by pumping
Tank.In the electrochemical reaction that cathode and anode also occur, Ying Jinliang avoids generating adverse effect to electrode.
The diluted acid regenerated liquid produced by bipolar membrane electrodialysis device 3 can be such that H-type cation bed failure cation exchange resin obtains
Regeneration, generated sig water do it and use.
In conventional regeneration technique, concentrated acid used in H-type cation bed ion exchange resin regeneration needs to purchase, transport and store etc.
Link, since concentrated acid is dangerous material, it is necessary to just can guarantee the safety in each storing link using special equipment.It is additionally provided with concentrated acid
Bunkerage is needed when using concentrated acid using concentrated acid measuring equipment, the concentrated acid of storage is rushed dilute, is deployed.This is that have danger
The operation of danger once has generation concentrated acid operation to lead to the case of personnel's heavy casualties.So existing concentrated acid regeneration method is to vast
The manager and user of enterprise make troubles, and there has been no new technologies to change this situation at present.
In the present invention, sig water and diluted acid regenerated liquid is directly made using Bipolar Membrane, with traditional H-type cation bed regeneration technology
It is less identical.
Caustic soda used in the present invention is needed directly to be made by bipolar membrane electrodialysis device 3 according to regeneration.Again according to resin
Life degree requires difference, and concentrated acid concentration is also different, and this, simplifies resin regeneration techniques.The quality percentage of concentrated acid obtained
Concentration highest only has 5%, considerably increases safety.
With bipolar membrane electrodialysis device 3 under DC electric field effect, acid solution is voluntarily made by water decomposition, instead of outsourcing in the present invention
Concentrated acid regenerates the traditional handicraft of H-type cation bed, improves the regeneration level of H-type cation bed cation exchanger resin, eliminates acid again
The storing link of raw liquid, H-type cation bed cation exchanger resin regenerative operation is more convenient, improves level of security, to environment friend
It is good.
Advantages of the present invention:
1) need not outsourcing acid, without storing, used while producing with station service voluntarily by salt water relieving haperacidity.
2) the low-concentration alkali liquor safe ready with mass percentage concentration less than 5%, worker's working condition make moderate progress.
3) energy-saving and emission-reduction, ion exchange resin regeneration expense decrease.
4) operate simplified, equipment handover charge is conducive to popularization with low；
5) area of the product of the present invention especially suitable for the soda acids supply bottleneck such as borderland and west area；
6) it is used especially suitable for thermal power plant or nuclear power plant, is particularly suitable for use when old factory's energy-saving and emission-reduction technological transformation.
The present invention is particularly suitable for using current advanced Bipolar membrane water splitting to improve traditional H-type cation bed regeneration technology
It is used in thermal power plant.
Detailed description of the invention
The appearance signal of the electrically regenerative H-type cation bed failure anion exchange resin method of Bipolar Membrane method when Fig. 1 is co-current regeneration
Figure.
Fig. 2 is the electrically regenerative H-type cation bed failure anion exchange resin bipolar membrane electrodialysis device schematic diagram of Bipolar Membrane method.
The appearance signal of the electrically regenerative H-type cation bed failure anion exchange resin method of Bipolar Membrane method when Fig. 3 is counter-current regeneration
Figure.
In figure, 1- weak brine tank；The pole 2- water pot；3- bipolar membrane electrodialysis device；4- diluted alkaline tank；5- diluted acid regenerates flow container；6-H
Type cation bed ion exchange pot；7- anode；8- cavity block；9- anode membrane；10- Bipolar Membrane: 11- cathode
Specific embodiment
With reference to the accompanying drawing, a specific embodiment of the invention is described:
Embodiment 1
The appearance signal of the electrically regenerative H-type cation bed failure cation exchange resin method of Bipolar Membrane method when Fig. 1 is co-current regeneration
Figure.
A kind of method of the electrically regenerative H-type cation bed failure cation exchange resin of Bipolar Membrane method, this method comprises the following steps:
(1) it prepares weak brine: before the regeneration of H-type cation bed, weak brine should be prepared, weak brine adds salt to be made by pure water, to adjust
Salinity is saved to setting value, the obtained weak brine up to concentration setpoint is stored in weak brine tank；
(2) it prepares diluted acid regenerated liquid: while off-the-line, starting bipolar membrane electrodialysis device, in direct current in the failure of H-type cation bed
Under electric field action, bipolar membrane electrodialysis device is by water power from for H+And OH-Ion, they respectively with the salt ion knot in weak brine
It closes, diluted acid regenerated liquid and sig water is directly made by weak brine, obtained diluted acid regenerated liquid is sent into hold-up tank, for regenerating resin
When use；It is used for other purposes that obtained sig water is sent into hold-up tank；
(3) it recoils: failing after off-the-line in H-type cation bed, recoiled by cation bed bottom into pure water, wash away cation exchange resin
Smalls and dirt in layer；
(4) it regenerates: by obtained diluted acid regenerated liquid, being sent into failure cation bed from hold-up tank.It is regenerated by concurrent, then diluted acid is again
Raw liquid crosses cation bed cation exchange resin layer from top to bottom；By counter-current regeneration, then diluted acid regenerated liquid flows through cation bed sun from bottom to top
Ion exchange resin layer；
(5) it cleans: for remaining regenerated liquid and regeneration product in Scavenger resin layer, after regeneration, being cleaned using pure water, clearly
It is washed till until effluent quality complies with standard.
Weak brine described in step (1) adds the pure salt of chemistry to be made by pure water, and the salt is sodium chloride, sodium sulphate, chlorination
One of ammonium or ammonium sulfate.
Mass percentage concentration≤8% of diluted acid regenerated liquid described in step (2).
Co-current regeneration refers to that the flow direction of the regenerated liquid in H-type cation bed ion exchange pot is intended to treatment fluid with when running from top to bottom
The flow direction of body is identical from top to bottom, i.e., two kinds of flow directions are in fair current.
Embodiment 2
The appearance signal of the electrically regenerative H-type cation bed failure cation exchange resin method of Bipolar Membrane method when Fig. 3 is counter-current regeneration
Figure.
It is big when the method and co-current regeneration of the electrically regenerative H-type cation bed failure cation exchange resin of Bipolar Membrane method when counter-current regeneration
It causes identical.
Counter-current regeneration refers to that the flow direction of the regenerated liquid in H-type cation bed ion exchange pot is intended to treatment fluid with when running from bottom to top
The flow direction of body is from top to bottom on the contrary, i.e. two kinds of flow directions are in adverse current.
Claims (3)
1. a kind of method of the electrically regenerative H-type cation bed failure cation exchange resin of Bipolar Membrane method, this method comprises the following steps,
It is characterized in that:
(1) it prepares weak brine: before the regeneration of H-type cation bed, weak brine should be prepared, weak brine adds salt to be made by pure water, to adjust salt
Concentration to setting value, the obtained weak brine up to concentration setpoint is stored in weak brine tank；
(2) it prepares diluted acid regenerated liquid: while off-the-line, starting bipolar membrane electrodialysis device, in DC electric field in the failure of H-type cation bed
Under effect, bipolar membrane electrodialysis device is by water power from for H+And OH-Ion, they respectively in conjunction with the salt ion in weak brine, by
Diluted acid regenerated liquid and sig water is directly made in weak brine, and obtained diluted acid regenerated liquid enters hold-up tank, for making when regenerating resin
With；It is used for other purposes that obtained sig water enters hold-up tank；
(3) it recoils: failing after off-the-line in H-type cation bed, recoiled, washed away in cation exchange resin layer into pure water by anion bed bottom
Smalls and dirt；
(4) it regenerates: by obtained diluted acid regenerated liquid, being sent into failure cation bed from hold-up tank.It is regenerated by concurrent, then diluted acid regenerated liquid
Cation bed cation exchange resin layer is crossed from top to bottom；By counter-current regeneration, then diluted acid regenerated liquid flows through cation bed cation from bottom to top
Exchange resin layer；
(5) it cleans: for remaining regenerated liquid and regeneration product in Scavenger resin layer, after regeneration, being cleaned using pure water, cleaning is extremely
Until effluent quality complies with standard.
2. the method for the electrically regenerative H-type cation bed failure cation exchange resin of Bipolar Membrane method according to claim 1, feature
Be: weak brine described in step (1) adds the pure salt of chemistry to be made by pure water, and the salt is sodium chloride, sodium sulphate, ammonium chloride
Or one of ammonium sulfate.
3. the method for the electrically regenerative H-type cation bed failure cation exchange resin of Bipolar Membrane method according to claim 1, feature
It is: mass percentage concentration≤8% of diluted acid regenerated liquid described in step (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313312.8A CN109908976A (en) | 2017-12-12 | 2017-12-12 | A kind of electrically regenerative H-type cation bed failure cation exchange resin method of Bipolar Membrane method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313312.8A CN109908976A (en) | 2017-12-12 | 2017-12-12 | A kind of electrically regenerative H-type cation bed failure cation exchange resin method of Bipolar Membrane method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109908976A true CN109908976A (en) | 2019-06-21 |
Family
ID=66957197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711313312.8A Withdrawn CN109908976A (en) | 2017-12-12 | 2017-12-12 | A kind of electrically regenerative H-type cation bed failure cation exchange resin method of Bipolar Membrane method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109908976A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548548A (en) * | 2019-10-12 | 2019-12-10 | 唐可 | Double-chamber ion exchanger in-situ regeneration process, device and water treatment system |
| CN112121873A (en) * | 2020-09-21 | 2020-12-25 | 昆山三一环保科技有限公司 | Regeneration process of cobalt-removing resin |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4880513A (en) * | 1986-06-20 | 1989-11-14 | The Graver Company | Method and apparatus for generating acid and base regenerants and the use thereof to regenerate ion-exchange resins |
| US5352345A (en) * | 1991-05-07 | 1994-10-04 | Alliedsignal Inc. | Ion exchange resin regenerant waste recovery and recycling via bipolar membranes |
| CN1184005A (en) * | 1996-11-29 | 1998-06-10 | 清华大学 | Electrical ion exchange resin regenerating method and equipment |
| CN1401432A (en) * | 2002-06-18 | 2003-03-12 | 北京国电龙源环保工程有限公司 | Method and apparatus for regenerating ion exchange resin by bipolar membrane hydrolytic dissociation |
| CN2739170Y (en) * | 2004-05-14 | 2005-11-09 | 王方 | Composite bed ion exchange resin electro-regenerating device |
| JP2006043549A (en) * | 2004-08-03 | 2006-02-16 | Hitachi Maxell Ltd | Pure water making apparatus and soft water making apparatus |
| CN1787971A (en) * | 2004-02-09 | 2006-06-14 | 日立麦克赛尔株式会社 | Apparatus for forming ion-exchanged water and method for regenerating ion exchange resin therein |
| CN203725159U (en) * | 2014-03-06 | 2014-07-23 | 苏州华清水处理技术有限公司 | Device for electro-regeneration of mixed bed ion exchange resin with bipolar membrane method |
| CN104888870A (en) * | 2014-03-06 | 2015-09-09 | 苏州华清水处理技术有限公司 | Apparatus for electrically regenerating mixed bed ion exchange resin through bipolar membrane method |
-
2017
- 2017-12-12 CN CN201711313312.8A patent/CN109908976A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4880513A (en) * | 1986-06-20 | 1989-11-14 | The Graver Company | Method and apparatus for generating acid and base regenerants and the use thereof to regenerate ion-exchange resins |
| US5352345A (en) * | 1991-05-07 | 1994-10-04 | Alliedsignal Inc. | Ion exchange resin regenerant waste recovery and recycling via bipolar membranes |
| CN1184005A (en) * | 1996-11-29 | 1998-06-10 | 清华大学 | Electrical ion exchange resin regenerating method and equipment |
| CN1401432A (en) * | 2002-06-18 | 2003-03-12 | 北京国电龙源环保工程有限公司 | Method and apparatus for regenerating ion exchange resin by bipolar membrane hydrolytic dissociation |
| CN1787971A (en) * | 2004-02-09 | 2006-06-14 | 日立麦克赛尔株式会社 | Apparatus for forming ion-exchanged water and method for regenerating ion exchange resin therein |
| CN2739170Y (en) * | 2004-05-14 | 2005-11-09 | 王方 | Composite bed ion exchange resin electro-regenerating device |
| JP2006043549A (en) * | 2004-08-03 | 2006-02-16 | Hitachi Maxell Ltd | Pure water making apparatus and soft water making apparatus |
| CN203725159U (en) * | 2014-03-06 | 2014-07-23 | 苏州华清水处理技术有限公司 | Device for electro-regeneration of mixed bed ion exchange resin with bipolar membrane method |
| CN104888870A (en) * | 2014-03-06 | 2015-09-09 | 苏州华清水处理技术有限公司 | Apparatus for electrically regenerating mixed bed ion exchange resin through bipolar membrane method |
Non-Patent Citations (1)
| Title |
|---|
| 王方等: ""双极膜法混床离子交换树脂电再生技术"", 《2016中国水处理技术研讨会暨第36届年会论文集》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548548A (en) * | 2019-10-12 | 2019-12-10 | 唐可 | Double-chamber ion exchanger in-situ regeneration process, device and water treatment system |
| CN110548548B (en) * | 2019-10-12 | 2024-03-29 | 唐可 | In-situ regeneration process and device for double-chamber ion exchanger and water treatment system |
| CN112121873A (en) * | 2020-09-21 | 2020-12-25 | 昆山三一环保科技有限公司 | Regeneration process of cobalt-removing resin |
| CN112121873B (en) * | 2020-09-21 | 2023-06-09 | 昆山三一环保科技有限公司 | Regeneration process of cobalt-removing resin |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA3195237C (en) | Li recovery processes and onsite chemical production for li recovery processes | |
| EP0249925B1 (en) | Method for generating acid and base regenerants and use thereof to regenerate ion-exchange resins | |
| CN104888870B (en) | Apparatus for electrically regenerating mixed bed ion exchange resin through bipolar membrane method | |
| CN107381886A (en) | A kind of method of reverse osmosis concentrated water near-zero release | |
| CN103388198B (en) | A kind of bipolar membrane electrodialysis method is produced the method for soda acid from viscose rayon sodium sulphate waste liquid | |
| CN104073839B (en) | The device and method of high-purity TPAOH co-production bromine element is prepared in electrolysis | |
| CN107512806A (en) | Ion exchange resin waste water zero discharge processing method | |
| CN111715180B (en) | Modified natural zeolite and preparation method and application thereof | |
| CN104278288A (en) | Method for preparing high-purity tetrabutyl ammonium hydroxide by continuous electrolysis | |
| CN109607918A (en) | A kind of green circulatory of power battery ternary material precursor production waste water utilizes technique | |
| CN109908976A (en) | A kind of electrically regenerative H-type cation bed failure cation exchange resin method of Bipolar Membrane method | |
| CN113830740B (en) | Method for preparing acid and alkali by bipolar membrane based on electrodialysis technology | |
| CN204097575U (en) | Electrolysis cells in ionic exchange membrane caustic | |
| CN203725159U (en) | Device for electro-regeneration of mixed bed ion exchange resin with bipolar membrane method | |
| JP2009231238A (en) | Recycling method for exhaust electrolyte | |
| CN109908979A (en) | A kind of electrically regenerative OH type anion bed failure anion exchange resin method of Bipolar Membrane method | |
| Gao et al. | Regenerating spent acid produced by HZSM-5 zeolite preparation by bipolar membrane electrodialysis | |
| US10584037B2 (en) | Systems to make lithium hydroxide monohydrate from lithium salts | |
| CN109908975A (en) | A kind of electrically regenerative H-type cation bed failure cation exchange resin device of Bipolar Membrane method | |
| CN109908978A (en) | A kind of electrically regenerative OH type anion bed failure anion exchange resin device of Bipolar Membrane method | |
| CN103343403B (en) | Viscose sodium sulfate waste liquor acid and alkali recycling technology by virtue of bipolar membrane electrodialysis method | |
| CN206467016U (en) | A kind of integrated apparatus that ion exchange resin regeneration brine waste is handled with bipolar film electrodialysis method | |
| CN109468656B (en) | Cation diaphragm electrolytic cell series device for removing carbon before electrolysis and application thereof | |
| CN105597557B (en) | A kind of preparation method being used for from the composite membrane of extracting lithium from salt lake brine | |
| CN103386254B (en) | Cleaning method for bipolar-membrane electrodialysis membrane group device for preparing acid/base from sodium sulfate waste liquid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190621 |
|
| WW01 | Invention patent application withdrawn after publication |