CN110228841B - Method for extracting acid and alkali from waste acid and waste alkali - Google Patents
Method for extracting acid and alkali from waste acid and waste alkali Download PDFInfo
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- CN110228841B CN110228841B CN201810178348.8A CN201810178348A CN110228841B CN 110228841 B CN110228841 B CN 110228841B CN 201810178348 A CN201810178348 A CN 201810178348A CN 110228841 B CN110228841 B CN 110228841B
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- 239000002253 acid Substances 0.000 title claims abstract description 103
- 239000002699 waste material Substances 0.000 title claims abstract description 78
- 239000003513 alkali Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 130
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000003011 anion exchange membrane Substances 0.000 claims abstract description 13
- 238000001179 sorption measurement Methods 0.000 claims abstract description 13
- 230000005684 electric field Effects 0.000 claims abstract description 12
- 150000002500 ions Chemical class 0.000 claims abstract description 11
- -1 hydrogen ions Chemical class 0.000 claims abstract description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 6
- 239000001257 hydrogen Substances 0.000 claims abstract description 6
- 150000005838 radical anions Chemical class 0.000 claims abstract description 4
- 239000003014 ion exchange membrane Substances 0.000 claims description 50
- 239000012528 membrane Substances 0.000 claims description 19
- 238000005341 cation exchange Methods 0.000 claims description 12
- 239000003518 caustics Substances 0.000 claims description 9
- 150000001768 cations Chemical class 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 4
- 150000001450 anions Chemical class 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000002585 base Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000004966 Carbon aerogel Substances 0.000 description 1
- 238000005349 anion exchange Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
- B01D61/445—Ion-selective electrodialysis with bipolar membranes; Water splitting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
- B01D61/46—Apparatus therefor
- B01D61/48—Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
-
- 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
- C02F1/4691—Capacitive deionisation
-
- 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
- C02F1/4695—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis electrodeionisation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Urology & Nephrology (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention provides a method for extracting acid and alkali from waste acid and waste alkali, which is used for solving the problem of difficult disposal of the waste acid and the waste alkali. S11, injecting a liquid electrode into the first liquid electrode channel and the second liquid electrode channel, wherein the liquid electrode has an electro-adsorption function; injecting water into the first water flow channel, and injecting waste acid liquid into the waste acid liquid channel; s12, direct current voltage is applied between the first positive collector and the first negative collector; s13, under the action of an electric field, the liquid electrode adsorbs ions to form adsorption current, specifically, acid radical anions in the waste acid liquid enter a first water flow channel through an anion exchange membrane and are combined with hydrogen ions in the first water flow channel to form an acid solution; is implemented by a device for extracting acid from waste acid. The method for extracting the acid and the alkali from the waste acid and the waste alkali can separate the acid and the alkali from the waste acid and the waste alkali by the action of an electric field and reuse the acid and the alkali for industrial use, thereby avoiding the difficult problem of disposal of the waste acid and the waste alkali.
Description
[ Field of technology ]
The invention relates to the field of resource recycling, in particular to a method for extracting acid and alkali from waste acid and waste alkali.
[ Background Art ]
At present, a large amount of acid and alkali are used as industrial raw materials in the industry, so that a large amount of waste acid and waste alkali containing various impurities are generated in the process. Disposal of these spent acids and spent alkalis has been a problem for people, because they have not only a significant impact on the environment, but also the cost of innocuous treatment of them is high, and is a great waste of one raw material. There is a great need for a means of recovering the acids and bases of waste acids and bases at a relatively low cost.
[ Invention ]
The invention provides a method for extracting acid and alkali from waste acid and waste alkali, which is used for solving the problem of difficult disposal of the waste acid and the waste alkali.
The method for extracting acid from waste acid comprises the following steps: s11, injecting a liquid electrode into the first liquid electrode channel and the second liquid electrode channel, wherein the liquid electrode has an electro-adsorption function; injecting water into the first water flow channel, and injecting waste acid liquid into the waste acid liquid channel; s12, direct current voltage is applied between the first positive collector and the first negative collector; s13, under the action of an electric field, the liquid electrode adsorbs ions to form adsorption current, specifically, acid radical anions in the waste acid liquid enter a first water flow channel through an anion exchange membrane and are combined with hydrogen ions in the first water flow channel to form an acid solution; the device for extracting acid from waste acid is implemented by adopting the following device, and the device is of a laminated structure and sequentially comprises: a first positive collector, a first bipolar ion exchange membrane, an anion exchange membrane, a second bipolar ion exchange membrane, and a first negative collector; a first liquid electrode channel is formed between the first positive collector and the first bipolar ion exchange membrane, a first water flow channel is formed between the first bipolar ion exchange membrane and the anion exchange membrane, a waste acid liquid channel is formed between the anion exchange membrane and the second bipolar ion exchange membrane, and a second liquid electrode channel is formed between the second bipolar ion exchange membrane and the first negative collector.
Wherein, in the device for extracting acid from waste acid, a partition frame and/or a partition net are arranged in a first liquid electrode channel, a first water flow channel, a waste acid liquid channel and a second liquid electrode channel.
The device for extracting acid from waste acid comprises a first liquid electrode channel, a second liquid electrode channel, a first conveying pump and a second conveying pump, wherein the first conveying pump is arranged between the first liquid electrode channel and the second liquid electrode channel in the device for extracting acid from waste acid, and a closed-loop channel connection is formed.
Wherein, still include the step: s14, forming a closed loop between the first liquid electrode channel and the second liquid electrode channel, and circularly flowing the liquid electrodes therein.
Another method for extracting alkali from waste alkali according to the embodiment of the invention comprises the following steps: s21, injecting a liquid electrode into the third liquid electrode channel and the fourth liquid electrode channel, wherein the liquid electrode has an electro-adsorption function; injecting water into the second water flow channel, and injecting waste lye into the waste lye channel; s22, direct-current voltage is applied between the second negative collector and the second positive collector; s23, under the action of the electrode, the liquid electrode adsorbs ions to form adsorption current, specifically cations in the waste alkali solution enter a second water flow channel through a cation exchange membrane and are combined with hydroxide ions in the second water flow channel to form an alkali solution; the device for extracting alkali from waste alkali is implemented by adopting the following device which is of a laminated structure and sequentially comprises: a second negative collector, a third bipolar ion exchange membrane, a cation exchange membrane, a fourth bipolar ion exchange membrane, and a second positive collector; a third liquid electrode channel is formed between the second negative collector and the third bipolar ion exchange membrane, a second water flow channel is formed between the third bipolar ion exchange membrane and the cation exchange membrane, a waste liquid reduction channel is formed between the cation exchange membrane and the fourth bipolar ion exchange membrane, and a fourth liquid electrode channel is formed between the fourth bipolar ion exchange membrane and the second positive collector.
Wherein, the third liquid electrode channel, the second water flow channel, the waste lye channel and the fourth liquid electrode channel are respectively provided with a partition frame and/or a partition net.
And a second delivery pump is further arranged between the third liquid electrode channel and the fourth liquid electrode channel, and a closed-loop channel connection is formed.
Wherein, still include the step: s24, forming a closed loop between the third liquid electrode channel and the fourth liquid electrode channel, and circularly flowing the liquid electrodes in the closed loop.
The method for extracting the acid and the alkali from the waste acid and the waste alkali can separate the acid and the alkali from the waste acid and the waste alkali by the action of an electric field and reuse the acid and the alkali for industrial use, thereby avoiding the difficult problem of disposal of the waste acid and the waste alkali.
[ Description of the drawings ]
FIG. 1 is a block diagram of an apparatus for extracting acid from spent acid according to example 1 of the present invention;
FIG. 2 is a flow chart of the method of the invention for extracting acid from spent acid according to example 2;
FIG. 3 is a block diagram showing an apparatus for extracting alkali from spent caustic according to example 3 of the present invention;
FIG. 4 is a flow chart of the method of the invention for extracting alkali from spent caustic according to example 4;
FIG. 5 is a schematic diagram of the system for extracting acid from spent acid according to example 5 of the present invention;
FIG. 6 is a schematic diagram of the system for extracting alkali from spent caustic according to example 6 of the present invention.
[ Detailed description ] of the invention
The inventor researches and repeated experiments find that the liquid containing acid (alkali) with a certain concentration flows through a treatment module consisting of an ion exchange membrane, an electrode, a separation material, a fixing piece and corresponding pipeline pipes, ions in the liquid migrate to different polarity directions under the action of a direct current electric field, and the acid (alkali) is respectively recombined in different liquid flow channels under the blocking and permeation actions of various ion exchange membranes, so that acid liquid (alkali liquid) is obtained at the outlet of the device, and can be directly used for industrial production or further concentrated and utilized.
The specific idea is to alternately place bipolar ion exchange membranes, anion (cation) exchange membranes between two collector electrodes, and preferably to provide a spacer frame and/or a screen between each electrode and the adjacently placed membrane, and between the adjacent membranes to form a flow channel. A liquid electrode is arranged in the liquid flow channel between the collector and the ion exchange membrane and has an electro-adsorption function, can adsorb ions under the action of a direct current electric field, and can desorb the ions under the condition of losing the electric field or changing the direction of the electric field. A liquid containing a certain concentration of acid (alkali) is introduced into a liquid flow channel between one bipolar ion exchange membrane and the anion (cation) ion exchange membrane, and a water flow is introduced into a liquid flow channel between the other bipolar ion exchange membrane and the anion (cation) ion exchange membrane. When a direct current electric field is applied between the two collectors, the liquid electrode in the collector channel with positive polarity will generate an electric adsorption effect to adsorb anions with negative polarity, the liquid electrode in one channel with negative polarity adsorbs cations with positive polarity, and the ions in the other channels migrate to the positive and negative poles respectively under the action of the whole electric field, and the ions only can migrate unidirectionally due to the selective permeation effect of the ion exchange membrane, so that adsorption current is formed. Because anions and cations are blocked by the cation-anion exchange layer on the bipolar ion exchange membrane respectively and cannot permeate, water in the catalytic layer in the bipolar ion exchange membrane is forced to be continuously dissociated, hydrogen ions and hydroxide ions are respectively formed to enter corresponding liquid flow channels, and acid (alkali) is formed by pairing with ions entering the channels through the ion exchange membrane and is discharged along with liquid flow. In one operating situation, a liquid electrode having anions adsorbed in one collector channel (e.g., anode) is transported into the other collector channel (e.g., cathode), the positive charge carried by the electrode particles is neutralized with the negative charge on the cathode, the adsorbed anions are desorbed and permeate the ion exchange membrane into the flow channel under the action of the electric field force to form an acid with the hydrogen ions generated on the bipolar ion exchange membrane. The desorbed liquid electrode from the collector channel is then pumped by a pump into the first collector channel to form a circuit. The liquid electrode may be any mixture of conductive material and liquid. The liquid electrode is usually composed of a base liquid, electrode particles, auxiliaries and the like. Water or polar liquid is generally used as base liquid, carbon material or other conductive material particles are used as electrode particles, surfactant or dispersing agent is used as auxiliary agent, and carbon black and other materials are used as conductive auxiliary agents. The carbon material has high specific surface area, developed internal pore structure and good electric conductivity, and can be graphene, carbon nano-tube, activated carbon, carbon aerogel, template carbon and the like. The morphology and size of the particles are such that they are conducive to forming a stable slurry fluid in the base fluid. The following is a detailed description of examples.
Example 1 an apparatus for extracting acid from waste acid according to the present embodiment, as shown in fig. 1, has a laminated structure, and sequentially comprises: a first positive collector 101, a first bipolar ion exchange membrane 102, an anion exchange membrane 103, a second bipolar ion exchange membrane 104, and a first negative collector 105; a first liquid electrode channel 106 is formed between the first positive collector 101 and the first bipolar ion exchange membrane 102, a first water flow channel 107 is formed between the first bipolar ion exchange membrane 102 and the anion exchange membrane 103, a waste acid liquid channel 108 is formed between the anion exchange membrane 103 and the second bipolar ion exchange membrane 104, and a second liquid electrode channel 109 is formed between the second bipolar ion exchange membrane 104 and the first negative collector 105. Preferably, a bulkhead and/or a screen 110 is provided in the first liquid electrode channel 106, in the first water flow channel 107, in the acid pickle channel 108 and in the second liquid electrode channel 109, and a first transfer pump 111 is further included between the first liquid electrode channel 106 and the second liquid electrode channel 109, and forms a closed loop channel connection.
Example 2, a method of this example for extracting acid from spent acid, was carried out using the apparatus for extracting acid from spent acid of example 1 described above, and is shown in fig. 2, comprising the steps of:
S201, injecting a liquid electrode into the first liquid electrode channel and the second liquid electrode channel, injecting water into the first water flow channel, and injecting waste acid liquid into the waste acid liquid channel.
And S202, applying direct current voltage between the first positive collector and the first negative collector.
S203, under the action of the electrode, acid radical anions in the waste acid liquid penetrate through the anion exchange membrane to enter the first water flow channel and combine with hydrogen ions in the first water flow channel to form an acid solution.
S204, forming a closed loop between the first liquid electrode channel and the second liquid electrode channel, and circularly flowing the liquid electrodes therein to realize desorption.
Example 3 an apparatus for extracting alkali from spent caustic according to this example, as shown in fig. 3, has a laminated structure, and sequentially comprises: a second negative collector 301, a third bipolar ion exchange membrane 302, a cation exchange membrane 303, a fourth bipolar ion exchange membrane 304, and a second positive collector 305; a third liquid electrode channel 306 is formed between the second negative collector 301 and the third bipolar ion exchange membrane 302, a second water flow channel 307 is formed between the third bipolar ion exchange membrane 302 and the cation exchange membrane 303, a waste liquid reducing channel 308 is formed between the cation exchange membrane 303 and the fourth bipolar ion exchange membrane 304, and a fourth liquid electrode channel 309 is formed between the fourth bipolar ion exchange membrane 304 and the second positive collector 305. Preferably, a spacer frame and/or net 310 is provided in the third liquid electrode channel 306, in the second water flow channel 307, in the waste lye channel 308 and in the fourth liquid electrode channel 309, and a second transfer pump 311 is further included between the third liquid electrode channel 306 and the fourth liquid electrode channel 309, and forms a closed loop channel connection.
Example 4, a method for extracting alkali from spent caustic according to this example, which is implemented using the apparatus for extracting alkali from spent caustic according to example 3 described above, is shown in fig. 4, and includes the steps of:
S401, injecting the liquid electrode into the third liquid electrode channel and the fourth liquid electrode channel, injecting water into the second water flow channel, and injecting the waste lye into the waste lye channel.
And S402, applying direct current voltage between the second negative collector and the second positive collector.
S403, under the action of the electrode, cations in the waste alkali solution enter the second water flow channel through the cation exchange membrane and are combined with hydroxide ions in the second water flow channel to form an alkali solution.
S404, forming a closed loop between the third liquid electrode channel and the fourth liquid electrode channel, and circularly flowing the liquid electrodes therein to realize desorption.
Example 5 the inventors consider that all of the membrane stack sections in the apparatus can be stacked n between the collectors to form a membrane stack assembly, and the system for extracting acid from spent acid of this example, as shown in fig. 5, includes at least 2 apparatuses for extracting acid from spent acid of example 1, in this example 3 apparatuses, respectively apparatus 501, apparatus 502 and apparatus 503, to form a stack structure. Wherein, the setting directions of the adjacent 2 devices are mirror images of each other, and the adjacent collectors with the same polarity are shared.
In embodiment 6, the inventor considers that all membrane group parts in the device can be overlapped and placed between n collecting electrodes to form a membrane stack assembly, and the system for extracting alkali from waste alkali in this embodiment, as shown in fig. 6, comprises at least 2 devices for extracting alkali from waste alkali in embodiment 3, in this embodiment, 2 devices are taken as examples, and are respectively a device 601 and a device 602, so as to form a stack structure. Wherein, the setting directions of the adjacent 2 devices are mirror images of each other, and the adjacent collectors with the same polarity are shared.
The description and applications of the present invention herein are illustrative and exemplary only and are not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are fully possible and various alternatives and equivalents of the embodiments are known to those skilled in the art. It will also be apparent to those of skill in the art that the invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof, and that other variations and modifications may be made in the embodiments disclosed herein without departing from the scope or spirit of the invention.
Claims (8)
1. A method for extracting acid from spent acid, comprising:
S11, injecting a liquid electrode into the first liquid electrode channel and the second liquid electrode channel, wherein the liquid electrode has an electro-adsorption function; injecting water into the first water flow channel, and injecting waste acid liquid into the waste acid liquid channel;
S12, direct current voltage is applied between the first positive collector and the first negative collector;
s13, under the action of an electric field, the liquid electrode adsorbs ions to form adsorption current, specifically, acid radical anions in the waste acid liquid enter a first water flow channel through an anion exchange membrane and are combined with hydrogen ions in the first water flow channel to form an acid solution;
the device for extracting acid from waste acid is implemented by adopting the following device, and the device is of a laminated structure and sequentially comprises: a first positive collector, a first bipolar ion exchange membrane, an anion exchange membrane, a second bipolar ion exchange membrane, and a first negative collector;
A first liquid electrode channel is formed between the first positive collector and the first bipolar ion exchange membrane, a first water flow channel is formed between the first bipolar ion exchange membrane and the anion exchange membrane, a waste acid liquid channel is formed between the anion exchange membrane and the second bipolar ion exchange membrane, and a second liquid electrode channel is formed between the second bipolar ion exchange membrane and the first negative collector.
2. The method for extracting acid from waste acid according to claim 1, wherein the first liquid electrode channel, the first water flow channel, the waste acid liquid channel and the second liquid electrode channel in the device for extracting acid from waste acid are all provided with a bulkhead and/or a partition net.
3. The method for extracting acid from spent acid according to claim 1, wherein a first transfer pump is further included between the first liquid electrode channel and the second liquid electrode channel in the apparatus for extracting acid from spent acid, and a closed loop channel connection is formed.
4. The method for extracting acid from spent acid according to claim 1, further comprising the steps of:
s14, forming a closed loop between the first liquid electrode channel and the second liquid electrode channel, and circularly flowing the liquid electrodes therein.
5. A method for extracting alkali from spent caustic, comprising:
s21, injecting a liquid electrode into the third liquid electrode channel and the fourth liquid electrode channel, wherein the liquid electrode has an electro-adsorption function; injecting water into the second water flow channel, and injecting waste lye into the waste lye channel;
s22, direct-current voltage is applied between the second negative collector and the second positive collector;
S23, under the action of the electrode, the liquid electrode adsorbs ions to form adsorption current, specifically cations in the waste alkali solution enter a second water flow channel through a cation exchange membrane and are combined with hydroxide ions in the second water flow channel to form an alkali solution;
The device for extracting alkali from waste alkali is implemented by adopting the following device which is of a laminated structure and sequentially comprises: a second negative collector, a third bipolar ion exchange membrane, a cation exchange membrane, a fourth bipolar ion exchange membrane, and a second positive collector;
A third liquid electrode channel is formed between the second negative collector and the third bipolar ion exchange membrane, a second water flow channel is formed between the third bipolar ion exchange membrane and the cation exchange membrane, a waste liquid reduction channel is formed between the cation exchange membrane and the fourth bipolar ion exchange membrane, and a fourth liquid electrode channel is formed between the fourth bipolar ion exchange membrane and the second positive collector.
6. The method for extracting alkali from waste alkali as claimed in claim 5, wherein the third liquid electrode channel, the second water flow channel, the waste alkali liquid channel and the fourth liquid electrode channel are respectively provided with a partition frame and/or a partition net.
7. The method of extracting alkali from spent caustic according to claim 5, further comprising a second transfer pump between the third liquid electrode channel and the fourth liquid electrode channel and forming a closed loop channel connection.
8. The method for extracting alkali from spent caustic according to claim 5, further comprising the steps of:
s24, forming a closed loop between the third liquid electrode channel and the fourth liquid electrode channel, and circularly flowing the liquid electrodes in the closed loop.
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| CN201810178348.8A CN110228841B (en) | 2018-03-05 | 2018-03-05 | Method for extracting acid and alkali from waste acid and waste alkali |
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| CN201810178348.8A CN110228841B (en) | 2018-03-05 | 2018-03-05 | Method for extracting acid and alkali from waste acid and waste alkali |
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| CN110228841B true CN110228841B (en) | 2024-07-02 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5049250A (en) * | 1989-08-14 | 1991-09-17 | Allied-Signal Inc. | Electrodialytic treatment of aqueous solutions containing amino acids |
| CN208104011U (en) * | 2018-03-05 | 2018-11-16 | 孙晓慰 | The apparatus and system of acid, alkali is extracted from spent acid, salkali waste |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5162076A (en) * | 1988-11-30 | 1992-11-10 | Allied-Signal Inc. | Method for purification of acids from materials comprising acid and salt |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5049250A (en) * | 1989-08-14 | 1991-09-17 | Allied-Signal Inc. | Electrodialytic treatment of aqueous solutions containing amino acids |
| CN208104011U (en) * | 2018-03-05 | 2018-11-16 | 孙晓慰 | The apparatus and system of acid, alkali is extracted from spent acid, salkali waste |
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