CN112782334A - Ion chromatography carbonate leacheate concentration ratio adjusting device and method - Google Patents
Ion chromatography carbonate leacheate concentration ratio adjusting device and method Download PDFInfo
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Abstract
The invention discloses a device and a method for adjusting the concentration ratio of ion chromatography carbonate leacheate, belonging to the technical field of design and manufacture of analytical instruments and equipment, and comprising a fastening screw, a fastening steel plate, an anode electrode joint, a cathode electrode joint, an anode area regenerated liquid channel, a cathode area regenerated liquid inlet, a cathode area regenerated liquid channel, an intermediate leacheate channel, an anode electrode slice, m layers of anionic membranes, a bipolar membrane, n layers of cationic membranes, a cathode electrode slice, an anode area electrolytic cell body, an intermediate electrolytic cell body and a cathode area electrolytic cell body, wherein when initial leacheate is a carbonate solution with a certain concentration and a constant current is applied, part of metal ions in the carbonate leacheate are replaced by hydrogen ions and migrate to the cathode area under the action of an electric field, so that the ratio of carbonate and bicarbonate is changed, and the optimal chromatographic separation effect is expected to be achieved, the proportion is adjusted to be proportional to the applied current, and the carbonate solution with the proportion of more than or equal to 10mmol/L can be adjusted.
Description
Technical Field
The invention belongs to the technical field of design and manufacture of analytical instrument equipment; in particular to a device for adjusting the concentration ratio of ion chromatography carbonate leacheate.
Background
The ion chromatography is a branch of liquid chromatography, is mainly used for separating and analyzing ionic compounds, and is the first choice for analyzing inorganic anions at presentThe method also has certain advantages in inorganic metal cation analysis. The ion exchange selectivity factor determines the degree to which the solute displaces the eluent ions from the stationary phase, and as the degree of interaction between the eluent ions and the stationary phase changes, the retention and selectivity also changes. The main factors influencing the interaction include the enthalpy and entropy of hydration, the degree of polarization, the number of charges, the size and the structure of the leacheate and the solute. In anion separation, the anions in the leacheate are effective leacheate ions. From the point of inhibition, the anion of the selected leaching solution needs to be weak acidic radical, namely easy protonation, and the anion is combined with hydrogen ions to generate weak dissociation acid; in addition, the eluent must provide reasonable elution capabilities, requiring that the target ion be eluted from the stationary phase in a reasonable time. The types of leachates most commonly used for anion separation at present are potassium hydroxide and potassium carbonate (mostly potassium carbonate/potassium bicarbonate mixed solution). The potassium carbonate leacheate has the advantages of strong elution capacity (the simultaneous elution of ions with different valence states can be realized in an isocratic mode), relative mildness, changeable selectivity by adjusting the proportion of potassium carbonate/potassium bicarbonate and the like, so that the potassium carbonate/potassium bicarbonate mixed solution is widely applied in an inhibition type ion chromatography system. Carbonate radical (CO)3 2-) And bicarbonate radical (HCO)3 -) All easily protonate to form carbonic acid with weak electric conductivity, and simply change carbonic acid CO3 2-And HCO3 -The separation selectivity can be flexibly changed.
Bipolar membrane (BPM) is a special type of ion exchange membrane that is made by compressing a layer of cationic membrane and a layer of anionic membrane through a special process. At the interface between the cationic and anionic membranes of a bipolar membrane, a special interface layer is present, with a thickness of about the order of nanometers. Therefore, when an electric field is applied (even at a very low voltage), an extremely high electric field intensity is generated in the interface layer, and water molecules present in the interface layer undergo so-called enhanced water dissociation, i.e., dissociation of water molecules into hydrogen ions (H +) and hydroxyl ions (OH-). Conventional water molecule dissociation constant of 10-14. Related studies have shown that the water dissociation constant of BPM interface layers can be increased by fifty million times. In the process, no electricity is generatedThe generation of the biogas is solved, so the energy consumption is lower than that of the common water electrolysis. Bipolar membrane water dissociation technology can convert water-soluble salts to their corresponding acids and bases, which process uses bipolar membranes in conjunction with conventional cation and/or anion exchange membranes. The earlier patent (CN109136975A) discloses a double-membrane type acid or alkali solution on-line generator, which adopts a structure similar to a double-membrane type and combines a bipolar membrane to construct an eluent on-line generator, and can be used for on-line preparation of high-purity acid or alkali eluent in the fields of liquid chromatography and ion chromatography. However, the method can only produce acid leacheate or alkali leacheate, cannot directly produce salt leacheate (such as potassium carbonate), and cannot produce carbonate and bicarbonate mixed leacheate with different concentration ratios by changing current. At present, the manual preparation of carbonate and bicarbonate mixed leacheate with different proportions consumes time and labor and has low efficiency.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides an ion chromatography carbonate leacheate concentration ratio adjusting device, which has a basic structure of a sandwich structure, wherein an anode area regeneration liquid channel, a middle leacheate channel and a cathode area regeneration liquid channel are spatially separated from the anode area regeneration liquid channel and the cathode area regeneration liquid channel respectively by using m layers of anionic membranes (m is more than or equal to 3) + bipolar membranes and n layers of cationic membranes (n is more than or equal to 4), wherein the bipolar membranes are placed in a directional mode, the cationic membrane surfaces of the bipolar membranes face the middle channels, the anionic membrane surfaces of the bipolar membranes are tightly attached to the m layers of anionic membranes and face the anode area, the n layers of cationic membranes are placed on one side of the cathode area, and partial metal ions in carbonate are replaced by hydrogen ions through an electrodialysis principle, so that the ratio of carbonate components is adjusted.
The carbonate leacheate concentration proportion regulator of the invention utilizes the combined action of an electric field and an ion exchange membrane to realize the directional migration of ions, so as to convert a carbonate solution with a certain concentration into a bicarbonate with the same concentration, thereby changing the proportion of carbonate and bicarbonate (the proportion of which is related to the applied current), in particular, when the initial leacheate is a carbonate (generally potassium carbonate and sodium carbonate, for convenience of description, the potassium carbonate is taken as an example) solution with a certain concentration, under the action of the electric field, when a constant current is applied to the proportion regulator, part of metal ions, such as potassium ions, of the carbonate leacheate in an intermediate leacheate channel can be electrically migrated to an anion area regeneration liquid channel through n layers of cation membranes, and simultaneously hydrogen ions generated by the water dissociation in an interface layer of the bipolar membranes are electrically migrated to the intermediate leacheate channel, the bicarbonate leacheate is produced by combining carbonate and the bicarbonate leacheate, and the ratio of the concentration of the carbonate to the concentration of the bicarbonate can be controlled by adjusting the current so as to achieve the optimal separation selectivity.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an ion chromatogram carbonate leacheate concentration ratio adjusting device, includes the fastening steel sheet, the fastening steel sheet is equipped with two altogether, two fastening steel sheet symmetrical arrangement, and fixed anode region electrolytic cell body, middle electrolytic cell body and negative pole district electrolytic cell body in proper order between two fastening steel sheets, two fastening steel sheets pass through fastening screw fixed connection, correspond respectively on two fastening steel sheets and be fixed with positive electrode joint and negative electrode joint, positive electrode joint pierces through fastening steel sheet and positive electrode piece electric connection, and during positive electrode piece is fixed in anode region regeneration liquid passageway, negative electrode joint pierces through fastening steel sheet and negative electrode piece electric connection, and during negative electrode piece is fixed in negative pole district regeneration liquid passageway, anode region regeneration liquid passageway and negative pole district regeneration liquid passageway all locate on the middle electrolytic cell body, anode region regeneration liquid passageway both ends link up respectively and are fixed with anode region regeneration liquid passageway entry and anode region regeneration liquid passageway both ends and anode region regeneration liquid passageway entry and anode region regeneration A regenerated liquid channel outlet, wherein the anode area regenerated liquid channel inlet and the anode area regenerated liquid channel outlet are respectively arranged on two sides of the anode area electrolytic cell body, the two ends of the cathode area regenerated liquid channel are respectively fixed with a cathode area regenerated liquid channel inlet and a cathode area regenerated liquid channel outlet, the inlet of the cathode area regenerated liquid channel and the outlet of the cathode area regenerated liquid channel are respectively arranged on two sides of the electrolytic cell body of the cathode area, m layers of anionic membranes, bipolar membranes, a middle leacheate channel and n layers of cationic membranes are sequentially arranged between the anode electrode plate and the cathode electrode plate, and m layers of anionic membranes, bipolar membranes, an intermediate leacheate channel and n layers of cationic membranes are all arranged in the intermediate electrolytic cell body, the two ends of the middle leacheate channel are connected with a middle leacheate channel inlet and a middle leacheate channel outlet in a through way, the middle leacheate channel inlet and the middle leacheate channel outlet are respectively arranged on two sides of the middle electrolytic cell body.
Further, the bipolar membranes are arranged in an oriented mode, the anion membrane surfaces of the bipolar membranes are tightly attached to m layers of anion membranes, and the cation membrane surfaces of the bipolar membranes face to the middle leacheate channel.
Further, an ion chromatography carbonate leacheate concentration proportion adjusting device is arranged between the pump and the sample injection valve in the ion chromatography system.
Furthermore, m ≧ 3, n ≧ 4 among the m-layer anion membrane and n-layer cation membrane.
Further, the intermediate eluent channel is filled with ion exchange resin.
Furthermore, the anode electrode plate and the cathode electrode plate both adopt a porous platinum electrode structure.
Further, the method for adjusting the concentration ratio of the ion chromatography carbonate leacheate comprises the following steps:
1) pure water continuously enters the anode area regenerated liquid channel through the anode area regenerated liquid channel inlet under the driving of an external peristaltic pump;
2) pure water continuously enters the cathode area regenerated liquid channel through the cathode area regenerated liquid channel inlet under the driving of an external peristaltic pump;
3) the carbonate solution continuously passes through the middle leacheate channel through an external peristaltic pump;
4) the two ends of the anode electrode joint and the cathode electrode joint are connected with an external power supply;
5) part of cations in the carbonate solution migrate to the regeneration liquid channel of the cathode region through the n layers of cation membranes under the action of an electric field, are combined with hydroxide ions generated by water electrolysis in the regeneration liquid channel of the cathode region to generate alkali, and then are carried to a waste liquid bottle by continuously flowing pure water;
6) meanwhile, the interface layer inside the bipolar membrane is subjected to water dissociation to form hydrogen ions and hydroxyl ions, the hydrogen ions migrate to the middle leacheate channel through the cation membrane surface of the bipolar membrane and combine with carbonate to generate bicarbonate, and the proportion adjustment between the carbonate and the bicarbonate is realized.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, by utilizing an electrodialysis principle, a carbonate solution with a certain concentration is prepared manually, a mixed solution of carbonate and bicarbonate with a certain concentration proportion can be generated on line, and a leacheate channel is not interfered by electrolytic gas in the process, so that any degassing device is not needed; the device places between pump and sampling valve at traditional ion chromatography system, can change carbonate and bicarbonate radical proportion in the carbonate leacheate through adjusting current size to obtain the leacheate of different selectivity, need not artifical different concentration ratio leacheate mobile phase of preparing again, it is more quick, convenient, high-efficient, be favorable to finding the leacheate concentration of best separation selectivity more soon.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an ion chromatography carbonate leacheate concentration ratio adjusting device according to the invention;
FIG. 2 is an enlarged view of three channels of an ion chromatography carbonate leacheate concentration ratio adjusting device of the invention;
FIG. 3 is a schematic diagram showing the adjustment of the composition of a carbonate solution and the change of ion retention selectivity by changing a current by a carbonate eluent concentration ratio adjuster in example 2 of the present invention;
FIG. 4 is a graph showing the comparison of the repeatability of the leacheate generated by the carbonate leacheate concentration proportioner and the artificially prepared leacheate in the embodiment 3 of the invention;
in the figure: 1-fastening screw, 2-fastening steel plate, 3-anode electrode joint, 4-cathode electrode joint, 5-anode zone regeneration liquid inlet, 6-anode zone regeneration liquid outlet, 7-anode zone regeneration liquid channel, 8-cathode zone regeneration liquid inlet, 9-cathode zone regeneration liquid outlet, 10-cathode zone regeneration liquid channel, 11-middle leacheate channel inlet, 12-middle leacheate channel outlet, 13-middle leacheate channel, 14-anode electrode slice, 15-m layers of anionic membranes, 16-bipolar membrane, 1601-bipolar membrane cationic membrane surface, 1602-bipolar membrane anionic membrane surface, 17-n layers of cationic membranes, 18-cathode electrode slice, 19-anode zone electrolytic cell body and 20-intermediate electrolytic cell body, 21-cathode region electrolytic cell body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-2, the present invention provides a technical solution: an ion chromatography carbonate leacheate concentration ratio adjusting device comprises two fastening steel plates 2, wherein the two fastening steel plates 2 are symmetrically arranged, an anode area electrolytic cell body 19, a middle electrolytic cell body 20 and a cathode area electrolytic cell body 21 are sequentially fixed between the two fastening steel plates 2, the two fastening steel plates 2 are fixedly connected through fastening screws 1, an anode electrode joint 3 and a cathode electrode joint 4 are correspondingly fixed on the two fastening steel plates 2 respectively, the anode electrode joint 3 penetrates through the fastening steel plates 2 to be electrically connected with an anode electrode sheet 14, the anode electrode sheet 14 is fixed in an anode area regenerated liquid channel 7, the cathode electrode joint 4 penetrates through the fastening steel plates 2 to be electrically connected with a cathode electrode sheet 18, the cathode electrode sheet 18 is fixed in a cathode area regenerated liquid channel 10, the anode area regenerated liquid channel 7 and the cathode area regenerated liquid channel 10 are both arranged on the middle electrolytic cell body 20, an anode area regeneration liquid channel inlet 5 and an anode area regeneration liquid channel outlet 6 are respectively fixed at two ends of an anode area regeneration liquid channel 7 in a penetrating way, the anode area regeneration liquid channel inlet 5 and the anode area regeneration liquid channel outlet 6 are respectively arranged at two sides of an anode area electrolytic cell body 19, a cathode area regeneration liquid channel 10 is respectively fixed at two ends of a cathode area regeneration liquid channel inlet 8 and a cathode area regeneration liquid channel outlet 9 in a penetrating way, the cathode area regeneration liquid channel inlet 8 and the cathode area regeneration liquid channel outlet 9 are respectively arranged at two sides of a cathode area electrolytic cell body 21, m layers of anionic membranes 15, bipolar membranes 16, an intermediate leacheate channel 13 and n layers of cationic membranes 17 are sequentially arranged between an anode electrode plate 14 and a cathode electrode plate 18, and the m layers of anionic membranes 15, the bipolar membranes 16, the intermediate leacheate channel 13 and the n layers of cationic membranes 17 are all arranged in the intermediate electrolytic cell body 20, the intermediate leacheate passage 13 is connected with an intermediate leacheate passage inlet 11 and an intermediate leacheate passage outlet 12 at two ends in a through manner, and the intermediate leacheate passage inlet 11 and the intermediate leacheate passage outlet 12 are respectively arranged on two sides of the intermediate electrolytic cell body 20.
The bipolar membrane 16 is arranged in an oriented mode, the anion membrane surface of the bipolar membrane 16 is tightly attached to the m layers of anion membranes 15, and the cation membrane surface of the bipolar membrane 16 faces the middle leacheate channel 13.
An ion chromatography carbonate leacheate concentration proportion adjusting device is arranged between a pump and a sample injection valve in an ion chromatography system.
m is > 3, n is > 4 in m anionic membrane 15 and n cationic membrane 17.
The intermediate eluent passage 13 is filled with an ion exchange resin.
The anode electrode sheet 14 and the cathode electrode sheet 18 both adopt a porous platinum electrode structure.
The working steps of the ion chromatography carbonate leacheate concentration ratio adjusting device are as follows:
1) pure water continuously enters an anode area regeneration liquid channel 7 through an anode area regeneration liquid channel inlet 5 under the drive of an external peristaltic pump;
2) pure water continuously enters a cathode area regenerated liquid channel 10 through a cathode area regenerated liquid channel inlet 8 under the drive of an external peristaltic pump;
3) the carbonate solution continuously passes through the middle leacheate channel 13 through an external peristaltic pump;
4) the two ends of the anode electrode joint 3 and the cathode electrode joint 4 are connected with an external power supply;
5) part of cations in the carbonate solution are transferred to the regeneration liquid channel 10 of the cathode region through the n layers of cation membranes 17 under the action of an electric field, are combined with hydroxide ions generated by water electrolysis in the regeneration liquid channel 10 of the cathode region to generate alkali, and then are carried to a waste liquid bottle by continuously flowing pure water;
6) meanwhile, water in the interface layer inside the bipolar membrane 16 is dissociated into hydrogen ions and hydroxyl ions, the hydrogen ions migrate to the middle leacheate channel 13 through the cation membrane surface of the bipolar membrane 16 and combine with carbonate to generate bicarbonate, and the proportion between the carbonate and the bicarbonate is adjusted.
Example 2
The carbonate leacheate concentration ratio adjusting device in the embodiment 1 of the invention is adopted to adjust the K of 3mM, 5mM, 8mM and 10mM respectively2CO3And (3) the leacheate is obtained by testing the proportion of carbonate and bicarbonate in the leacheate through ion chromatography by adjusting the current of the device, and the proportion of the carbonate and the bicarbonate is obtained in the table 1.
TABLE 1 ratio of different concentrations of K2CO3 solutions at different currents giving [ HCO3- ]/[ CO32- ]
Example 3
In this example, the carbonate leacheate concentration ratio adjusting device in example 1 of the present invention was used to adjust the concentration of the carbonate leacheate at 8mM K2CO3The solution was the initial eluent, the flow rate was 0.8mL/min, currents of different magnitudes were applied to the apparatus, the retention times of the seven anions were observed, and the retention times of the ions were highly correlated with the eluent concentration or composition according to the basic theory of ion chromatography, to obtain fig. 3.
Example 4
In this example, the carbonate leacheate concentration ratio regulator in inventive example 1 was used to initially concentrateThe degree is 8mM K2CO3Applying current of 8.5mA under the leaching solution, and manually preparing 1.7mMK2CO3+6.3mMKHCO3，The eluents with recommended concentrations of the chromatographic column were compared, seven common anions were analyzed by sample injection and their repeatability was investigated, and fig. 4 was obtained.
As can be seen from Table 1, the device has a direct change in the ratio of carbonate to bicarbonate at different applied currents, where the greater the current applied by the device, the more hydrogen ions bound to the carbonate, the greater the bicarbonate ratio, and the lower the carbonate ratio, i.e. [ HCO ]3-]/[CO3 2-]The larger the ratio. This shows that the carbonate leacheate concentration ratio adjusting device in the embodiment 1 of the invention can effectively adjust the carbonate component on line
As can be seen from FIG. 3, when the device applied current is zero, i.e., the original 8mM K2CO3The target ions cannot be effectively separated from the baseline; by applying different currents to the device, the ratio of carbonate to bicarbonate can be adjusted, and the separation effect can be effectively improved. When 8mA of current is applied, the concentration ratio of generated leacheate achieves better separation selectivity for seven common anions.
FIG. 4 is a comparison of the reproducibility of the solutions of the carbonate leacheate produced by the concentration proportioner of the leacheate and the solutions prepared by people in example 1 of the present invention. As can be seen from FIG. 4, the initial concentration was 8mM K2CO3Under the condition of the leaching solution, a current of 8.5mA is applied, and the recommended concentration of 1.7mM K of the chromatographic column can be reached2CO3+6.3mM KHCO3The separation effect similar to the mobile phase is manually configured, and the repeatability is good.
As can be seen from Table 1, the device has a direct change in the ratio of carbonate to bicarbonate at different applied currents, where the greater the current applied by the device, the more hydrogen ions bound to the carbonate, the greater the bicarbonate ratio, and the lower the carbonate ratio, i.e. [ HCO ]3 -]/[CO3 2-]The larger the ratio. This shows that the carbonate leacheate concentration ratio adjusting device in the embodiment 1 of the invention can effectively adjust the carbonate component on line
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The ion chromatography carbonate leacheate concentration ratio adjusting device comprises two fastening steel plates (2) and is characterized in that the two fastening steel plates (2) are symmetrically arranged, an anode area electrolytic cell body (19), a middle electrolytic cell body (20) and a cathode area electrolytic cell body (21) are sequentially fixed between the two fastening steel plates (2), the two fastening steel plates (2) are fixedly connected through fastening screws (1), an anode electrode joint (3) and a cathode electrode joint (4) are correspondingly fixed on the two fastening steel plates (2) respectively, the anode electrode joint (3) penetrates through the fastening steel plates (2) and is electrically connected with an anode electrode plate (14), the anode electrode plate (14) is fixed in an anode area regeneration liquid channel (7), and the cathode electrode joint (4) penetrates through the fastening steel plates (2) and is electrically connected with a cathode electrode plate (18), and the cathode electrode plate (18) is fixed in the cathode area regenerated liquid channel (10), the anode area regenerated liquid channel (7) and the cathode area regenerated liquid channel (10) are both arranged on the middle electrolytic cell body (20), the two ends of the anode area regenerated liquid channel (7) are respectively penetrated and fixed with an anode area regenerated liquid channel inlet (5) and an anode area regenerated liquid channel outlet (6), the anode area regenerated liquid channel inlet (5) and the anode area regenerated liquid channel outlet (6) are respectively arranged on the two sides of the anode area electrolytic cell body (19), the two ends of the cathode area regenerated liquid channel (10) are respectively penetrated and fixed with a cathode area regenerated liquid channel inlet (8) and a cathode area regenerated liquid channel outlet (9), the cathode area regenerated liquid channel inlet (8) and the cathode area regenerated liquid channel outlet (9) are respectively arranged on the two sides of the cathode area electrolytic cell body (21), be equipped with m layers of anion membrane (15), bipolar membrane (16), middle leacheate passageway (13) and n layers of cation membrane (17) between anode electrode piece (14) and cathode electrode piece (18) in proper order, and m layers of anion membrane (15), bipolar membrane (16), middle leacheate passageway (13) and n layers of cation membrane (17) all locate in middle electrolytic cell body (20), middle leacheate passageway (13) both ends through connection have middle leacheate passageway entry (11) and middle leacheate passageway export (12), middle leacheate passageway entry (11) and middle leacheate passageway export (12) are located respectively on middle electrolytic cell body (20) both sides.
2. The ion chromatography carbonate leacheate concentration ratio adjusting device according to claim 1, wherein the bipolar membrane (16) is oriented, an anionic membrane surface of the bipolar membrane (16) is tightly attached to the m-layer anionic membrane (15), and a cationic membrane surface of the bipolar membrane (16) faces the middle leacheate channel (13).
3. The ion chromatography carbonate leacheate concentration ratio adjusting device according to claim 1, wherein the ion chromatography carbonate leacheate concentration ratio adjusting device is placed between the pump and the sample injection valve in the ion chromatography system.
4. The apparatus for adjusting the concentration ratio of an ion chromatography carbonate leacheate according to claim 1, wherein m is greater than or equal to 3, and n is greater than or equal to 4 in the m-layer anionic membrane (15) and the n-layer cationic membrane (17).
5. The ion chromatography carbonate leacheate concentration ratio adjusting device according to claim 1, wherein the intermediate leacheate channel (13) is filled with ion exchange resin.
6. The ion chromatography carbonate leacheate concentration ratio adjusting device according to claim 1, wherein the anode electrode sheet (14) and the cathode electrode sheet (18) are both of a porous platinum electrode structure.
7. The method for adjusting the concentration ratio of the ion chromatography carbonate leacheate according to claim 1, wherein the method comprises the following steps:
1) the water solution continuously enters an anode area regenerated liquid channel (7) through an anode area regenerated liquid channel inlet (5) under the drive of an external peristaltic pump;
2) the water solution continuously enters a cathode area regenerated liquid channel (10) through a cathode area regenerated liquid channel inlet (8) under the drive of an external peristaltic pump;
3) the carbonate solution continuously passes through the middle leacheate channel (13) through an external peristaltic pump;
4) the two ends of the anode electrode joint (3) and the cathode electrode joint (4) are connected with an external power supply;
5) part of cations in the carbonate solution are transferred to a regeneration liquid channel (10) of a cathode region through an n-layer cation membrane (17) under the action of an electric field, are combined with hydroxide ions generated by water electrolysis in the regeneration liquid channel (10) of the cathode region to generate alkali, and then are carried to a waste liquid bottle by continuously flowing pure water;
6) meanwhile, water in an inner interface layer of the bipolar membrane (16) is dissociated into hydrogen ions and hydroxide ions, the hydrogen ions migrate to the middle leacheate channel (13) through a cation membrane surface of the bipolar membrane (16) and are combined with carbonate to generate bicarbonate, and the proportion between the carbonate and the bicarbonate is adjusted.
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Application publication date: 20210511 |