Dye desalting device

Abstract

The utility model discloses a dye desalting device which comprises a first impurity removal mechanism and a second impurity removal mechanism, the first impurity removal mechanism is filled with ion exchange resin, and the ion exchange resin is used for removing ion impurities in dye; the second impurity removal mechanism is communicated with the first impurity removal mechanism through a second conveying pump and comprises a composite filter membrane, the composite filter membrane is used for intercepting substances with the molecular weight larger than 200 Dalton, the filtering side of the composite filter membrane is communicated with a waste liquid valve of the second impurity removal mechanism, and the intercepting side of the composite filter membrane is communicated with a discharging valve of the second impurity removal mechanism; and the impurity-removed dye is discharged from the discharge valve. A two-stage desalting mode is adopted, and ion impurities in the dye are removed by using a first impurity removal mechanism; the dye is conveyed by a second conveying pump, the dye is secondarily removed in a second impurity removal mechanism, residual trace water-soluble salt impurities are removed by utilizing a composite filter membrane, and finally the ultra-purified dye with the harmful salt concentration lower than 200ppm is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of dye production and processing equipment, in particular to a dye desalination device. Background Art

[0002] Dyes are often used as pigments in inkjet inks due to their bright colors and low prices.

[0003] However, dyes often contain impurities, including intermediates, by-products, unreacted monomers, and inorganic salts produced during synthesis. These impurities not only affect the color concentration of the dye, but also seriously interfere with the color purity and solubility of the dye. Too much inorganic salt in the dye can easily lead to scale formation and corrosion of the ink channel. In severe cases, scale precipitation will cause nozzle clogging. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a dye desalination device, which can remove harmful salt impurities in the dye.

[0005] According to the dye desalination device of the embodiment of the utility model, the dye desalination device comprises:

[0006] a first impurity removal mechanism, wherein the first impurity removal mechanism is filled with an ion exchange resin, the dye is delivered to the first impurity removal mechanism by a first delivery pump, and the ion exchange resin is used to remove ionic impurities in the dye; and

[0007] The second impurity removal mechanism is connected with the first impurity removal mechanism through a second delivery pump, the dye is delivered to the second impurity removal mechanism through the second delivery pump, the second impurity removal mechanism includes a composite filter membrane, the composite filter membrane is used to intercept substances with a molecular weight greater than 200 Daltons, the filtering side of the composite filter membrane is connected with the waste valve of the second impurity removal mechanism, the intercepting side of the composite filter membrane is connected with the discharge valve of the second impurity removal mechanism, and the dye after impurity removal is discharged from the discharge valve.

[0008] The dye desalination device according to the embodiment of the utility model has at least the following beneficial effects: the dye desalination device of the utility model adopts a two-stage desalination method, and uses the first impurity removal mechanism to remove ionic impurities in the dye; after being transported by the second delivery pump, the dye is secondary removed in the second impurity removal mechanism, and the composite filter membrane is used to remove residual trace water-soluble salt impurities, and finally an ultra-purified dye with a harmful salt concentration of less than 200 ppm is obtained.

[0009] According to some embodiments of the present invention, the ion exchange resin includes an anion exchange resin and a cation exchange resin, and the anion exchange resin and the cation exchange resin are both filled in the same first impurity removal mechanism.

[0010] According to some embodiments of the utility model, the ion exchange resin includes an anion exchange resin and a cation exchange resin, and two first impurity removal mechanisms are provided, and the two first impurity removal mechanisms are arranged in series, one of the first impurity removal mechanisms is filled with the anion exchange resin and / or the cation exchange resin, and the other first impurity removal mechanism is filled with the cation exchange resin and / or the anion exchange resin.

[0011] According to some embodiments of the present invention, the composite filter membrane includes a porous membrane and a dense filter membrane, the porous membrane is attached to the dense filter membrane, the porous membrane is located on the interception side of the composite filter membrane, and the dense filter membrane is located on the filtration side of the composite filter membrane.

[0012] According to some embodiments of the present invention, the dense filter membrane is one of a cellulose acetate membrane, a polysulfone membrane, a polyamide membrane or a polyvinyl alcohol membrane.

[0013] According to some embodiments of the present invention, the structure of the composite filter membrane is one of a hollow fiber type and a roll type.

[0014] According to some embodiments of the present invention, a plurality of the second impurity removing mechanisms are provided, and the plurality of the second impurity removing mechanisms are arranged in series.

[0015] According to some embodiments of the present invention, a pressure gauge is further provided on the outside of the second impurity removing mechanism.

[0016] According to some embodiments of the present invention, the delivery pressure of the second delivery pump is greater than 7 kg / cm2.

[0017] According to some embodiments of the present invention, the delivery pressure of the second delivery pump is 9kg / cm 2 To 15kg / cm2.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1A schematic diagram of a dye desalination device according to an embodiment of the utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the second impurity removal mechanism of the dye desalination device is shown.

[0022] Reference numerals:

[0023] The first impurity removal mechanism 2; the first delivery pump 1; the second impurity removal mechanism 4; the second delivery pump 3; the composite filter membrane 5; the porous membrane 51; the dense filter membrane 52; the waste liquid valve 82; the discharge valve 81; the pressure gauge 6. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] Reference Figure 1 to Figure 2According to the dye desalination device of the embodiment of the utility model, the dye desalination device includes a first impurity removal mechanism 2 and a second impurity removal mechanism 4. The first impurity removal mechanism 2 is filled with ion exchange resin. The dye is delivered to the first impurity removal mechanism 2 by a first delivery pump 1. The ion exchange resin is used to remove ionic impurities in the dye. The second impurity removal mechanism 4 is connected to the first impurity removal mechanism 2 by a second delivery pump 3. The dye is delivered to the second impurity removal mechanism 4 by the second delivery pump 3. The second impurity removal mechanism 4 includes a composite filter membrane 5. The composite filter membrane 5 is used to intercept substances with a molecular weight greater than 200 Daltons. The filtering side of the composite filter membrane 5 is connected to the waste liquid valve 82 of the second impurity removal mechanism 4. The intercepting side of the composite filter membrane 5 is connected to the discharge valve 81 of the second impurity removal mechanism 4. The impurity-free dye is discharged from the discharge valve 81. The dye desalination device mainly includes the first impurity removal mechanism 2 and the second impurity removal mechanism 4. The first impurity removal mechanism 2 is filled with ion exchange resin to remove ionic impurities in the dye. The second impurity removal mechanism 4 intercepts substances with a molecular weight greater than 200 Daltons through the composite filter membrane 5, intercepts the macromolecular dye for further dye purification, and filters the small molecular impurities to the other side of the composite filter membrane to form waste liquid for discharge.

[0029] Specifically, the dye is delivered to the first impurity removal mechanism 2 through the first delivery pump 1. In this mechanism, the dye is fully contacted with the ion exchange resin, and the functional groups of the resin react with the ionic impurities in the dye to achieve selective adsorption and removal of the ionic impurities. This step is mainly aimed at small molecular ionic impurities in the dye. It can be understood that after the first impurity removal mechanism 2 uses the ion exchange resin to remove most of the harmful ions, the burden of the composite filter membrane of the second impurity removal mechanism 4 can be reduced, and the service life of the second impurity removal mechanism 4 can be increased; at the same time, it is also lower in cost than the traditional addition of ion capture agents and has less secondary pollution.

[0030] It should be noted that ion exchange resins need to be regenerated regularly to maintain their impurity removal performance. The regeneration process can be achieved by changing the pH or salt concentration of the resin's environment, so that the adsorbed ions are desorbed from the resin and the exchange capacity of the resin is restored.

[0031] The dye treated by the first impurity removal mechanism 2 is transported to the second impurity removal mechanism 4 through the second delivery pump 3. In this mechanism, the dye flows through the composite filter membrane 5, which has a specific pore size and can intercept dye substances with a molecular weight greater than 200 Daltons, that is, the dye products that remain in the interception side of the composite filter membrane 5 to be further purified, and the intercepted macromolecular dye is discharged from the discharge valve 81. The small molecular impurities and solvents less than 200 Daltons pass through the filtration effect of the composite filter membrane 5, that is, enter the filtration side of the composite filter membrane 5, and the small molecular impurities and solvents less than 200 Daltons pass through the composite filter membrane 5 to form waste liquid, which is discharged from the waste liquid valve 82.

[0032] Therefore, it can be understood that the dye desalination device according to the embodiment of the utility model has at least the following beneficial effects: the dye desalination device of the utility model adopts a two-stage desalination method, and uses the first impurity removal mechanism 2 to remove ionic impurities in the dye; after being transported by the second delivery pump 3, the dye is secondary removed in the second impurity removal mechanism 4, and the composite filter membrane 5 is used to remove residual trace water-soluble salt impurities, and finally an ultra-purified dye with a harmful salt concentration of less than 200 ppm is obtained.

[0033] Specifically, refer to Figure 1 In some embodiments of the utility model, the ion exchange resin includes an anion exchange resin and a cation exchange resin, and the anion exchange resin and the cation exchange resin are filled in the same first impurity removal mechanism 2. In the first impurity removal mechanism 2, the anion exchange resin and the cation exchange resin can be filled in a mixed or layered manner. When mixed filling, the two resin particles are mixed with each other, and anions and cations can be exchanged at the same time. When layered filling, the filling order and proportion of the two resins can be reasonably arranged according to the flow direction of the dye and the exchange capacity of the resin.

[0034] When the dye flows through the first impurity removal mechanism 2, the anions and cations therein will exchange with the anion exchange resin and the cation exchange resin respectively. The anion exchange resin can adsorb and remove the anionic impurities in the dye, such as chloride ions, sulfate ions, etc.; while the cation exchange resin can adsorb and remove the cationic impurities in the dye, such as sodium ions, potassium ions, etc. By filling the anion exchange resin and the cation exchange resin in the same first impurity removal mechanism 2 at the same time, it is possible to achieve the simultaneous removal of anionic and cationic impurities in the dye, thereby improving the impurity removal efficiency, simplifying the device structure, and reducing operating costs. In addition, this configuration method is also conducive to reducing the amount of resin used and the generation of wastewater, which is more environmentally friendly and economical. In actual operation, suitable anion exchange resin and cation exchange resin can be selected according to the type of dye and the impurity components, and the optimal filling ratio and method can be determined. At the same time, it is necessary to regularly monitor the exchange capacity and impurity removal effect of the resin, and regenerate or replace the resin in time to ensure the continuous and stable operation of the device.

[0035] Furthermore, in some embodiments of the present invention, the ion exchange resin includes an anion exchange resin and a cation exchange resin, and two first impurity removal mechanisms 2 are provided, and the two first impurity removal mechanisms 2 are arranged in series, wherein one of the first impurity removal mechanisms 2 is filled with anion exchange resin and / or cation exchange resin, and the other first impurity removal mechanism 2 is filled with cation exchange resin and / or anion exchange resin.

[0036] Specifically, the dye desalination device is provided with two first impurity removal mechanisms 2 connected in series, and anion exchange resin and cation exchange resin are respectively filled in the two mechanisms to achieve more efficient and thorough removal of ionic impurities. The dye first passes through the first first impurity removal mechanism 2, and then flows through the second first impurity removal mechanism 2. This series arrangement allows the ionic impurities in the dye to be removed twice, thereby improving the efficiency and thoroughness of impurity removal. Anion exchange resin and cation exchange resin can be selectively filled in the two first impurity removal mechanisms 2 connected in series. Specifically, there can be the following filling methods:

[0037] First, the first impurity removal mechanism 2 is filled with anion exchange resin, and the second first impurity removal mechanism 2 is filled with cation exchange resin; second, the first first impurity removal mechanism 2 is filled with cation exchange resin, and the second first impurity removal mechanism 2 is filled with anion exchange resin; third, both first impurity removal mechanisms 2 are filled with anion exchange resin and cation exchange resin, but the filling ratio and order can be different. The selection of these filling methods can be determined according to factors such as the type of dye, the type and concentration of ionic impurities, so as to achieve the best impurity removal effect. Through this series setting and selective filling method, the step-by-step and efficient removal of anionic and cationic impurities in the dye can be achieved.

[0038] Reference Figure 1 to Figure 2 In some embodiments of the present invention, the composite filter membrane 5 includes a porous membrane 51 and a dense filter membrane 52, the porous membrane 51 and the dense filter membrane 52 are attached to each other, the porous membrane 51 is located on the interception side of the composite filter membrane 5, and the dense filter membrane 52 is located on the filtration side of the composite filter membrane 5. The composite filter membrane 5 includes the porous membrane 51 and the dense filter membrane 52, and the combination of the two provides more efficient filtering performance and longer service life.

[0039] Composite filter membrane 5 is composed of porous membrane 51 and dense filter membrane 52, which fit together through specific technology to form an integral body.Porous membrane 51 is located at the interception side of composite filter membrane 5, i.e. the side that dye contacts first, and dense filter membrane 52 is located at the filtering side of composite filter membrane 5, i.e. the side that dye contacts after passing through porous membrane 51.Porous membrane 51 has larger pore size and higher porosity, which makes it possible to quickly intercept the macromolecular dye aqueous solution in the dye on its surface.Meanwhile, porous membrane 51 also has good permeability and supportability, guarantees that dye can pass smoothly.Dense filter membrane 52 then has smaller pore size and higher filtration accuracy, and it can further filter out the micromolecular ion impurities passing through porous membrane 51, guarantees the purity of dye.The dense structure of dense filter membrane 52 also makes it have higher pressure resistance and corrosion resistance, thereby prolongs the service life of composite filter membrane 5.

[0040] When the dye flows through the composite filter membrane 5, it is first intercepted by the porous membrane 51, and the macromolecular dye substance is trapped on the surface of the porous membrane 51. The small molecular ion impurities enter the porous membrane 51 under pressure dialysis and pass through the dense filter membrane 52, and finally form waste liquid and are discharged from the waste liquid valve 82. The advantage of this composite filter membrane 5 is that it combines the advantages of the porous membrane 51 and the dense filter membrane 52, and can not only quickly intercept a large number of macromolecular dyes to ensure the purity and quality of the dye, but also filter out the tiny small molecular ion impurities passing through the porous membrane 51. In addition, the composite filter membrane 5 also has a long service life and low maintenance cost, which can meet the needs of large-scale dye production.

[0041] In some embodiments of the utility model, the dense filter membrane 52 in the above embodiments is a cellulose acetate membrane, a polysulfone membrane, a polyamide membrane or a polyvinyl alcohol membrane, etc. When selecting the dense filter membrane 52, it is necessary to comprehensively consider the specific properties of the dye, the type of impurities and the conditions in the production process. For example, for dyes containing more organic impurities, a cellulose acetate membrane with good pollution resistance can be selected; for dyes that need to be filtered under high temperature or high pressure conditions, a polyamide membrane is more suitable. The choice of the material of the dense filter membrane 52 not only affects the filtering effect, but is also directly related to the service life and maintenance cost of the device. Therefore, in practical applications, it is crucial to select a suitable dense filter membrane 52 material according to the specific situation.

[0042] Similarly, in some embodiments of the present invention, the structure of the composite filter membrane 5 is one of the hollow fiber type and the roll type, and of course it can also be one of the plate-frame type or the tube type. The selection of the structure of the composite filter membrane 5 depends on the specific dye processing requirements, the design of the device and the operating conditions. For example, for occasions requiring high efficiency and high throughput, the hollow fiber type may be the best choice; while for scenes that need to withstand high pressure or high temperature, the plate-frame type or the tube type may be more suitable.

[0043] In some embodiments of the present invention, a plurality of second impurity removal mechanisms 4 are provided, and the plurality of second impurity removal mechanisms 4 are arranged in series. Through the continuous or cyclic processing of the plurality of second impurity removal mechanisms 4, the salt and other impurities in the dye can be more effectively removed, thereby improving the purity of the dye. In addition, the series arrangement allows the use of different impurity removal techniques or materials in each second impurity removal mechanism 4 to remove different types of impurities, thereby increasing the flexibility and pertinence of the entire desalination process.

[0044] In some embodiments of the utility model, a pressure gauge 6 is further provided on the outside of the second impurity removal mechanism 4. The pressure gauge 6 can be used to reflect the life of the composite filter membrane 5 in the second impurity removal mechanism 4. Specifically, the pressure gauge 6 is installed on the feed channel of the second impurity removal mechanism 4. After the dye aqueous solution enters the second impurity removal mechanism 4, the pressure generated by passing through the composite filter membrane 5 will be displayed on the pressure gauge 6. When the output pressure of the second delivery pump 3 is too large, the pressure gauge 6 will display a working pressure close to the second delivery pump 3. At this time, it represents that the membrane pressure of the second impurity removal mechanism 4 is too large, which may cause the composite filter membrane 5 to deform, and the power of the second delivery pump 3 needs to be adjusted. When the working power of the second delivery pump 3 is normal, the pressure gauge 6 still displays a working pressure close to the second delivery pump 3. At this time, it represents that the membrane pressure of the second impurity removal mechanism 4 is too large, and the composite filter membrane 5 is blocked, indicating that the composite filter membrane 5 needs to be replaced.

[0045] In some embodiments of the present invention, the delivery pressure of the second delivery pump 3 is greater than 7kg / cm 2 Optionally, the delivery pressure of the second delivery pump 3 is 9kg / cm 2 Up to 15kg / cm 2 The delivery pressure of the second delivery pump 3 is greater than 7kg / cm 2 The small molecule ion impurities can be better dialyzed by the pressure of the second delivery pump 3, so that the small molecule ion impurities can pass through the dense filter membrane 52 with nano-pore size, and then form waste liquid to be discharged from the waste liquid valve 82. If the pressure of the second delivery pump 3 is too low, the impurities cannot be dialyzed through the dense filter membrane 52, and the separation effect cannot be achieved.

[0046] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A dye desalination device, characterized in that: include: A first impurity removal mechanism, wherein the first impurity removal mechanism is filled with an ion exchange resin, the dye is delivered to the first impurity removal mechanism by a first delivery pump, and the ion exchange resin is used to remove ionic impurities in the dye; as well as The second impurity removal mechanism is connected with the first impurity removal mechanism through a second delivery pump, the dye is delivered to the second impurity removal mechanism through the second delivery pump, the second impurity removal mechanism includes a composite filter membrane, the composite filter membrane is used to intercept substances with a molecular weight greater than 200 Daltons, the filtering side of the composite filter membrane is connected with the waste valve of the second impurity removal mechanism, the intercepting side of the composite filter membrane is connected with the discharge valve of the second impurity removal mechanism, and the dye after impurity removal is discharged from the discharge valve.

2. A dye desalination device according to claim 1, characterized in that: The ion exchange resin includes an anion exchange resin and a cation exchange resin, and the anion exchange resin and the cation exchange resin are both filled in the same first impurity removal mechanism.

3. A dye desalination device according to claim 1, characterized in that: The ion exchange resin includes an anion exchange resin and a cation exchange resin. Two first impurity removal mechanisms are provided. The two first impurity removal mechanisms are arranged in series. One of the first impurity removal mechanisms is filled with the anion exchange resin and / or the cation exchange resin, and the other first impurity removal mechanism is filled with the cation exchange resin and / or the anion exchange resin.

4. A dye desalination device according to claim 1, characterized in that: The composite filter membrane comprises a porous membrane and a dense filter membrane. The porous membrane is attached to the dense filter membrane. The porous membrane is located on the interception side of the composite filter membrane, and the dense filter membrane is located on the filtration side of the composite filter membrane.

5. A dye desalination device according to claim 4, characterized in that: The dense filter membrane is one of cellulose acetate membrane, polysulfone membrane, polyamide membrane or polyvinyl alcohol membrane.

6. A dye desalination device according to claim 4, characterized in that: The structure of the composite filter membrane is one of a hollow fiber type and a roll type.

7. A dye desalination device according to claim 1, characterized in that: The second impurity removing mechanisms are provided in plurality, and the plurality of the second impurity removing mechanisms are arranged in series.

8. A dye desalination device according to claim 1, characterized in that: A pressure gauge is also arranged on the outer side of the second impurity removing mechanism.

9. A dye desalination device according to claim 1, characterized in that: The delivery pressure of the second delivery pump is greater than 7kg / cm 2 .

10. A dye desalination device according to claim 9, characterized in that: The delivery pressure of the second delivery pump is 9kg / cm 2 Up to 15kg / cm 2 .

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