CN216816578U - Anion and cation bifunctional electric film suppressor - Google Patents
Anion and cation bifunctional electric film suppressor Download PDFInfo
- Publication number
- CN216816578U CN216816578U CN202123017228.6U CN202123017228U CN216816578U CN 216816578 U CN216816578 U CN 216816578U CN 202123017228 U CN202123017228 U CN 202123017228U CN 216816578 U CN216816578 U CN 216816578U
- Authority
- CN
- China
- Prior art keywords
- cation
- anion
- channel
- leacheate
- regeneration liquid
- 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.)
- Active
Links
Images
Abstract
The utility model discloses an anion and cation bifunctional electric film suppressor. The structure of the device comprises an upper tank body, a cathode, an anion regeneration liquid channel screen, a cation exchange membrane, an anion leacheate channel screen, a bipolar membrane, a cation leacheate channel screen, an anion exchange membrane, a cation regeneration liquid channel screen, an anode and a lower tank body. The upper tank body and the lower tank body are fixed together through fastening screws for clamping the components. The screen is respectively arranged in the anion regeneration liquid channel, the anion leacheate channel, the cation leacheate channel and the cation regeneration liquid channel; under the action of an external electric field, a composite layer in the bipolar membrane is subjected to water dissociation to generate hydrogen ions and hydroxyl ions, the hydrogen ions are electrically migrated into an anion leacheate channel to perform a neutralization reaction with an alkali solution, the hydroxyl ions are electrically migrated into a cation leacheate channel to perform a neutralization reaction with an acid leacheate, the simultaneous inhibition of strong base and strong acid leacheate is realized, and the simultaneous analysis of anions and cations is finally realized.
Description
Technical Field
The utility model relates to the technical field of design and manufacture of analytical instrument equipment, in particular to an anion and cation bifunctional electrogenerated membrane suppressor which realizes simultaneous suppression (or on-line neutralization) of acid solution and alkali solution under the combined action of an electric field and an ion exchange membrane and finally realizes simultaneous analysis of anions and cations.
Background
Ion chromatography is a liquid chromatography method for analyzing inorganic and organic anions and cations, is the first choice method for analyzing anions at present, and is widely applied to the fields of environment, medicine, food, agriculture and the like. At present, the most common detection mode applied to the ion chromatography system is inhibition type conductivity detection, an inhibitor is an extremely important key component, acid or alkali leacheate with a high conductivity value can be converted into weak acid or weak alkali or pure water with a low conductivity value, detection signals of sample ions are increased, and the detection sensitivity of the ion chromatography is remarkably improved.
The electric film suppressor is the most common suppression mode of the current ion chromatographic system. It automatically generates regenerated ions H by utilizing the principle of electrolytic water+(or OH)-) And the on-line inhibition of the alkali solution (or the acid solution) is realized. The structure of the device is a typical sandwich structure, 3 solution channels are respectively independent in space, regeneration liquid channels are respectively arranged at two sides, and an eluent channel is arranged in the middle. The cathode and the anode are respectively arranged in the regeneration liquid channels at the two sides.
The middle leacheate channel and the regeneration liquid channels on the two sides are separated in space through two pieces of ion exchange membranes (such as Chinese patents 201210242286.5 and 201610788801.8). If the ion exchange membrane is a cation exchange membrane, an anion electro-membrane suppressor is obtained; if the ion exchange membrane is an anion exchange membrane, the ion exchange membrane is a cation electro-membrane suppressor.
It should be noted that the existing electrofilm suppressors are limited to a single function of analyzing anions or cations, and cannot simultaneously analyze anions and cations, that is, the anion suppressors can only suppress alkaline solutions for analyzing anions, and the cation suppressors can only suppress acidic solutions for analyzing cations. With the increasing amount of environment-friendly detection mass samples, the simultaneous analysis of anions and cations is required more and more.
The currently reported solution is to work in parallel with two independent electro-membrane suppressors, negative and positive. The drawback is the complex structure and the increased cost. To solve this problem, Hu et al (Chromograph, 2003,57,471-474) and the following Song Xiaofei et al (Chinese patent, CN204129021U) successively disclose "an anion-cation multifunctional ion chromatography suppressor". The structures given by the two reports are very similar, and both can realize simultaneous inhibition of alkali solution and acid solution, namely, can realize simultaneous analysis of anions and cations. It should be noted, however, that the "multifunctional" mentioned in the two above-mentioned subjects is actually only "dual-functional", and from the operating principle and the cases and descriptions provided by the authors, it is actually only dual-functional, i.e. simultaneous inhibition of the alkaline solution and the acidic solution is achieved; from the structural point of view, the two reports show that the two reports show the electro-membrane suppressors are equivalent to the simple superposition of the existing 1 anionic electro-membrane suppressor and 1 cationic electro-membrane suppressor, and only the two share 1 regeneration liquid channel. Therefore, the multifunctional electric film inhibitor has 5 solution channels. The other parts and structures are completely the same as those of the prior single-function electric film suppressor. For example, two ion exchange membranes of the same type are respectively adopted to manufacture an electro-membrane suppressor (two anion exchange membranes form a cation electro-membrane suppressor, and two cation exchange membranes form an anion electro-membrane suppressor); in addition, in the above-mentioned papers and patents, each solution channel is filled with an ion exchange resin. There is a possible problem that the solution leaks out due to a large kinetic resistance caused when the solution flows because the ion exchange resin has a small particle size. This is particularly significant for a dual suppressor configuration with 5 channels, which tends to result in high failure rates and poor operational stability.
The bipolar membrane is a unique ion exchange membrane, and is manufactured by closely attaching an anion exchange membrane and a cation exchange membrane through a unique process. An interfacial layer of very specific properties is present between the two films. Because the two films are tightly attached, even under the action of safe voltage, the interface layer can generate extremely high electric field intensity, so that water molecules at the interface layer can be subjected to enhanced dissociation to obtain hydrogen ions and hydroxyl ions. Under the action of the electric field, an acid solution and an alkali solution can be generated simultaneously. Therefore, the acid-base preparation by the bipolar membrane method has been industrially applied (see the following papers: Lijing, chemical management, 1 month 2015, page 171; Yongrong, Master thesis of Nankai university-research on acid-base preparation by bipolar membrane electrodialysis cleaning, 2014; Dong Heng, chemical development, 2010,29(2), 217-222). But industrial applications are focused on mass production, involving many solution channels in parallel, and therefore more structurally complex; in addition, the solution working medium for preparing acid and alkali in industrial application is high-concentration inorganic salt solution (such as potassium chloride solution) or acidified fruit juice, but high-purity acid solution and alkali solution; the solution used in the regeneration liquid channel is mostly high-concentration inorganic salt solution.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the defects of the prior art and provides an anion-cation bifunctional electrogenerated membrane suppressor which adopts a combined structure of a cation exchange membrane, a bipolar membrane and an anion exchange membrane. The structure had only 4 solution channels. Can inhibit strong alkali and strong acid solution at the same time, and realize simultaneous analysis of anions and cations.
In order to achieve the purpose, the utility model adopts the following technical scheme:
1. an anion and cation bifunctional electric film suppressor is characterized in that: the structure of the device comprises an upper cell body, a cathode electrode, an anion regeneration liquid channel screen, a cation exchange membrane, an anion leacheate channel screen, a bipolar membrane, a cation leacheate channel screen, an anion exchange membrane, a cation regeneration liquid channel screen, an anode electrode and a lower cell body which are sequentially arranged from top to bottom; the upper tank body and the lower tank body clamp the components in the middle, and the upper tank body and the lower tank body are fixed together through fastening screws;
an anion regeneration liquid channel is arranged on the anion regeneration liquid channel screen, and regeneration solution inlets and outlets are arranged at two ends of the anion regeneration liquid channel; a cathode electrode is arranged in the anion regeneration liquid channel, and one end of the cathode electrode is arranged on the upper cell body; an anion leacheate channel is arranged on the anion leacheate channel screen, and anion leacheate inlets and outlets are arranged at two ends of the anion leacheate channel; a cation leacheate channel is arranged on the cation leacheate channel screen, and cation leacheate inlets and outlets are arranged at two ends of the cation leacheate channel; a cation regeneration liquid channel is arranged on the cation regeneration liquid channel screen, cation regeneration liquid inlets and outlets are arranged at two ends of the cation regeneration liquid channel, an anode electrode is arranged in the cation regeneration liquid channel, and one end of the anode electrode is arranged on the lower tank body; a cation exchange membrane is arranged between the anion regeneration liquid channel and the anion leacheate channel; a bipolar membrane is arranged between the anion leacheate channel and the cation leacheate channel; and an anion exchange membrane is arranged between the cation leacheate channel and the cation regeneration liquid channel.
Wherein the anode membrane face of the bipolar membrane faces the anion eluent channel, and the cathode membrane face of the bipolar membrane faces the cation eluent channel; an anion exchange membrane is arranged between the cation leacheate channel and the cation regeneration liquid channel; the effluent leacheate of the anion chromatographic column and the effluent leacheate of the cation chromatographic column respectively flow through the anion leacheate channel and the cation leacheate channel from the anion leacheate channel inlet and the cation leacheate channel inlet in sequence, and then flow out of the anion leacheate channel outlet and the cation leacheate channel outlet to enter a downstream component, namely a detection pool (which does not belong to the protection scope of the utility model and is not described herein); and the regeneration liquid flows through the anion regeneration liquid channel and the cation regeneration liquid channel from the anion regeneration liquid channel inlet and the cation regeneration liquid channel inlet respectively, and then flows out from the anion regeneration liquid channel outlet and the cation regeneration liquid channel outlet to enter waste liquid.
Furthermore, the cathode electrode and the anode electrode adopt a porous platinum electrode structure, and the cathode electrode and the anode electrode are respectively tightly attached to the outer sides of the anion regeneration liquid channel screen and the cation regeneration liquid channel screen.
Further, a solution of sodium hydroxide, lithium hydroxide (the concentration of the above alkali solution is required to be less than or equal to 200mM) or a solution of potassium carbonate and sodium carbonate (the concentration of the above alkali solution is required to be less than or equal to 20 mM) is passed through the anion eluent channel; a peracid solution passes through the cation leacheate channel, specifically dilute sulfuric acid (the concentration is required to be less than or equal to 100mM) and a methane sulfonic acid solution (the concentration is required to be less than or equal to 200 mM); pure water or aqueous solution containing a small amount of impurity ions (the concentration of the impurity ions is required to be less than 100mg/L) passes through the anion regeneration liquid channel and the cation regeneration liquid channel.
Further, anion groups are grafted on the anion regeneration liquid channel screen and the anion leacheate channel screen, so that cation exchange can be realized; the anionic groups include, but are not limited to, sulfonic acid groups, carboxylic acid groups, phosphoric acid groups; the ion exchange capacity of the anion regeneration liquid channel screen is larger than that of the anion leacheate channel screen;
furthermore, cation groups are grafted on the cation regeneration liquid channel screen and the cation leacheate channel screen, so that anion exchange can be realized; the cationic groups include, but are not limited to, quaternary amine groups, tertiary amine groups, guanidino groups; the ion exchange capacity of the cation regeneration liquid channel screen is larger than the anion exchange capacity of the cation leacheate channel screen.
The utility model has the advantages and positive effects that:
the anion and cation bifunctional electrogenic membrane suppressor integrates the electrogenic membrane anion suppressor and the electrogenic membrane cation suppressor into a whole by utilizing an electrodialysis principle and combining a combined structure of a cation exchange membrane, a bipolar membrane and an anion exchange membrane, can simultaneously suppress alkali leacheate and acid leacheate, and realizes the simultaneous analysis of anion and cation analysis. The device has the advantages of simple structure, stable performance, convenience in assembly and the like.
Drawings
Fig. 1 is a schematic structural diagram of the anion and cation bifunctional electrogenerated membrane suppressor of the present invention.
Fig. 2 is an assembly schematic diagram of the anion and cation bifunctional electric film suppressor of the present invention.
FIG. 3 is a schematic diagram of the combination structure of the anion and cation bifunctional electrogenerated membrane suppressor and the anion and cation chromatographic systems.
Fig. 4 is a chromatogram of 6 common anions and 6 common cations simultaneously analyzed by the anion and cation bifunctional electrogenerated membrane suppressor of the present invention.
The labels in the figures are:
A. an anion regenerant channel;
B. an anion leacheate channel;
C. a cation leacheate channel;
D. a cation regenerant channel;
1. feeding into a pool body;
2. a cathode electrode;
3. an anion regeneration liquid channel screen;
4. a cation exchange membrane;
5. an anion leacheate channel screen;
6. bipolar membrane
601. A bipolar membrane anode face;
602. a bipolar membrane cathode face;
7. a positive ion leacheate channel screen;
8. an anion exchange membrane;
9. a cation regeneration liquid channel screen;
10. an anode electrode;
11. discharging the pond body;
12. an anion regenerant channel inlet;
13. an anion regenerant channel outlet;
14. an anion leacheate channel inlet;
15. an anion leacheate channel outlet;
16. a cation regenerant channel inlet;
17. an outlet of the cation regeneration liquid channel;
18. a cation leacheate channel inlet;
19. an outlet of the cation leacheate channel;
20. and (5) fastening the screw.
Detailed Description
The following explains the embodiment of the anion and cation double-function electric film suppressor specifically in combination with the attached drawings in the embodiment of the utility model. It should be noted that: the present invention is not limited to the following embodiments. In addition, the experimental methods used in the examples are all conventional methods unless otherwise specified; similarly, materials, structural members, reagents and the like used in the examples are commercially available unless otherwise specified. Based on the embodiments of the present invention, those skilled in the art can obtain all other embodiments without inventive modifications within the scope of the present invention.
Example 1
Referring to fig. 1, an anion and cation bifunctional electrogenerated membrane suppressor comprises an upper cell body 1, a lower cell body 11, and an anion regenerated liquid channel screen 3, a cation exchange membrane 4, an anion eluent channel screen 5, a bipolar membrane 6, a cation eluent channel screen 7, an anion exchange membrane 8, and a cation regenerated liquid channel screen 9 which are sequentially arranged from top to bottom, wherein the upper cell body 1 and the lower cell body 11 clamp the above components in the middle, and the upper cell body 1 and the lower cell body 11 are fastened by fastening screws 20.
An anion regeneration liquid channel A is arranged on the anion regeneration liquid channel screen 3, solution inlets and solution outlets are arranged at two ends of the anion regeneration liquid channel A and respectively used as an anion regeneration liquid channel inlet 12 and an anion regeneration liquid channel outlet 13, and a cathode electrode 2 is arranged in the anion regeneration liquid channel A;
an anion leacheate channel B is arranged on the anion leacheate channel screen 5, and solution inlets and outlets are arranged at two ends of the anion leacheate channel B and respectively used as an anion leacheate channel inlet 14 and an anion leacheate channel outlet 15;
a cation leacheate channel C is arranged on the cation leacheate channel screen 7, and solution inlets and outlets are arranged at two ends of the cation leacheate channel C and respectively used as a cation leacheate channel inlet 18 and a cation leacheate channel outlet 19;
a cation regeneration liquid channel D is arranged on the cation regeneration liquid channel screen 9; an anode electrode 10 is arranged in the channel D;
a cation exchange membrane 4 is arranged between the anion regeneration liquid channel A and the anion leacheate channel B; a bipolar membrane 6 is arranged between the anion leacheate channel B and the cation leacheate channel C. Wherein the anode surface 601 of the bipolar membrane faces to the anion eluent channel B, and the cathode surface 602 of the bipolar membrane faces to the cation eluent channel C; and an anion exchange membrane 8 is arranged between the cation leacheate channel C and the cation regeneration liquid channel D.
The anion and cation bifunctional electrogenerated membrane suppressor of the present invention is assembled according to the above steps and fig. 2, wherein the two leacheate channels (anion leacheate channel B and cation leacheate channel C) and the two regeneration liquid channels (anion regeneration liquid channel a and cation regeneration liquid channel D) are respectively independent from each other, and the structure enables the anion and cation bifunctional electrogenerated membrane suppressor of the present invention to be used for analyzing anions and cations.
The working modes of the anion and cation bifunctional electric film suppressor are as follows: the effluent leacheate of the anion chromatographic column and the cation chromatographic column sequentially flows through an anion leacheate channel B and a cation leacheate channel C from an anion leacheate channel inlet 14 and a cation leacheate channel inlet 18 respectively, and flows out from an anion leacheate channel outlet 15 and a cation leacheate channel outlet 19 to enter a downstream component, namely a detection pool; the regeneration liquid flows through the anion regeneration liquid channel A and the cation regeneration liquid channel D from the anion regeneration liquid channel inlet 12 and the cation regeneration liquid channel inlet 16 respectively, and then flows out from the anion regeneration liquid channel outlet 13 and the cation regeneration liquid channel outlet 17 to enter waste liquid.
Example 2
Referring to fig. 3, in this embodiment, a schematic structural diagram of a combination of an anion and cation bifunctional electrogenerated membrane suppressor and an anion and cation chromatographic systems is shown, the suppressor of the present invention is shown in a dashed box, and the structure of the suppressor is the same as that of embodiment 1, the suppressor is placed between a chromatographic column and a conductivity detector in an ion chromatographic system (the ion chromatographic system, i.e., the outer part of the dashed box, is directly available from commercial sources, and is not within the scope of the present invention), and effluent leacheate of the anion and cation chromatographic columns respectively passes through anion and cation leacheate channels of the suppressor of the present invention, and flows into the conductivity detector for detection after being suppressed. 6 common anions and 6 common cations are simultaneously analyzed, and the spectrum result is shown in figure 4 (the upper graph of figure 4 is a cation analysis spectrum, and the lower graph is an anion analysis spectrum). Therefore, the suppressor can simultaneously suppress strong base and strong acid leacheate and realize simultaneous analysis of anions and cations.
The foregoing is illustrative of the preferred embodiments of the present invention, and it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles and arrangements of the utility model, which should be considered as within the scope of the utility model.
Claims (5)
1. An anion and cation bifunctional electric film suppressor, which is characterized in that: the structure of the device comprises an upper tank body, a cathode electrode, an anion regeneration liquid channel screen, a cation exchange membrane, an anion leacheate channel screen, a bipolar membrane, a cation leacheate channel screen, an anion exchange membrane, a cation regeneration liquid channel screen, an anode electrode and a lower tank body which are sequentially arranged from top to bottom; the upper tank body and the lower tank body clamp the components in the middle, and the upper tank body and the lower tank body are fixed together through fastening screws;
an anion regeneration liquid channel is arranged on the anion regeneration liquid channel screen, and regeneration solution inlets and outlets are arranged at two ends of the anion regeneration liquid channel; a cathode electrode is arranged in the anion regeneration liquid channel, and one end of the cathode electrode is arranged on the upper cell body; an anion leacheate channel is arranged on the anion leacheate channel screen, and anion leacheate inlets and outlets are arranged at two ends of the anion leacheate channel; a cation leacheate channel is arranged on the cation leacheate channel screen, and cation leacheate inlets and outlets are arranged at two ends of the cation leacheate channel; a cation regeneration liquid channel is arranged on the cation regeneration liquid channel screen, cation regeneration liquid inlets and outlets are arranged at two ends of the cation regeneration liquid channel, an anode electrode is arranged in the cation regeneration liquid channel, and one end of the anode electrode is arranged on the lower tank body; a cation exchange membrane is arranged between the anion regeneration liquid channel and the anion leacheate channel; a bipolar membrane is arranged between the anion leacheate channel and the cation leacheate channel; and an anion exchange membrane is arranged between the cation leacheate channel and the cation regeneration liquid channel.
2. The anion and cation bifunctional electrogenerated membrane suppressor as claimed in claim 1, wherein said anion regenerant liquid channel screen exchange capacity is larger than that of anion eluent liquid channel screen, and said cation regenerant liquid channel screen exchange capacity is larger than that of cation eluent liquid channel screen.
3. The anion and cation bifunctional electric film suppressor as claimed in claim 1, wherein the working medium solution in the anion regeneration liquid channel and the cation regeneration liquid channel is pure water solution; the working medium solutions in the anion leacheate channel and the cation leacheate channel are respectively an alkali solution and an acid solution.
4. The anion and cation bifunctional electrogenerated membrane suppressor as claimed in claim 3, wherein the alkaline solution working medium of the anion eluent channel comprises any one of potassium hydroxide, sodium hydroxide, lithium hydroxide, potassium carbonate solution and sodium carbonate solution; the acid solution working medium of the cation leacheate channel comprises dilute sulfuric acid or methane sulfonic acid solution.
5. The anion and cation bifunctional electric film suppressor as claimed in claim 1, wherein said cathode electrode and anode electrode are porous platinum electrode structures, and said cathode electrode and anode electrode are respectively tightly attached to the outer sides of anion regeneration liquid channel screen and cation regeneration liquid channel screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123017228.6U CN216816578U (en) | 2021-12-03 | 2021-12-03 | Anion and cation bifunctional electric film suppressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123017228.6U CN216816578U (en) | 2021-12-03 | 2021-12-03 | Anion and cation bifunctional electric film suppressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216816578U true CN216816578U (en) | 2022-06-24 |
Family
ID=82052102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123017228.6U Active CN216816578U (en) | 2021-12-03 | 2021-12-03 | Anion and cation bifunctional electric film suppressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216816578U (en) |
-
2021
- 2021-12-03 CN CN202123017228.6U patent/CN216816578U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109136975B (en) | Double-film type acid or alkali solution on-line generator | |
| JP2908567B2 (en) | Intermittent electrolyte membrane suppressor regeneration for ion chromatography | |
| KR100423660B1 (en) | Continuous electrolytically regenerated packed bed suppressor for ion chromatography | |
| JP4750279B2 (en) | Current efficiency suppressor and method of use | |
| CA2087481C (en) | Ion chromatography system using electrochemical suppression and detector effluent recycle | |
| US7892848B2 (en) | Method of ion chromatography wherein a specialized electrodeionization apparatus is used | |
| US5597481A (en) | Electrochemical pretreatment system for liquid sample analysis | |
| CA2420411C (en) | Continuous electrolytically regenerated packed suppressor for ion chromatography | |
| CA2471705C (en) | Chromatography apparatus and electrolytic method for purifying an aqueous stream containing a contaminant ion | |
| CA2620639A1 (en) | Recycling of suppressor regenerants | |
| JP4362228B2 (en) | Continuously regenerated, integrated suppressor and detector and method for suppressed ion chromatography | |
| EP1587597B1 (en) | Improved capacity chemical suppressors and method of use | |
| JP2014095701A (en) | Improved suppressor device | |
| CN109704444B (en) | Bipolar membrane cation suppressor | |
| EP3267193B1 (en) | Electrolytic four-channel device and method | |
| KR101907600B1 (en) | Ion exchange based volatile component removal device for ion chromatography | |
| CN216816578U (en) | Anion and cation bifunctional electric film suppressor | |
| EP2863217A1 (en) | Multielectrode Electrolytic Device and Method | |
| CN112569793B (en) | Degassing-free trace anion impurity online remover and removing method in strong alkali solution | |
| JP2567581B2 (en) | Electrochemical pretreatment device for liquid sample analysis | |
| CN1003142B (en) | Ion chromatographic inhibitory column | |
| CN219449884U (en) | Eluent generation box and electrolytic eluent generator | |
| Hu et al. | Electrochemically generated multifunctional suppressor for ion chromatography |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |