Impurity removal and crystallization device for p-aminobenzene sulfonic acid crude product

Abstract

The impurity removal and crystallization device comprises a catalyst settling kettle, one side of the catalyst settling kettle is provided with a crude product feed port, the top of the catalyst settling kettle is provided with a hydrogen feed port, the bottom of the catalyst settling kettle is provided with a catalyst recovery discharge port, and the catalyst recovery discharge port is provided with an impurity removal and crystallization device. One side, far away from the crude product feeding hole, of the catalyst settling kettle is provided with a first purified liquid discharging hole, one end, far away from the catalyst settling kettle, of the first purified liquid discharging hole is communicated with a first membrane filtering kettle, and the outer wall of the first membrane filtering kettle is provided with a first solid isolate discharging hole; a second purified liquid discharge hole is formed in the outer wall of the first membrane filtration kettle. The utility model relates to the technical field of chemical product production, and solves the problems that in the prior art, when impurity removal and crystallization are carried out on a p-aminobenzene sulfonic acid crude product, the crude product is not effectively decolorized, so that the color of a recrystallized product is not pure enough, and the appearance quality and the market acceptability of the product are influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical product production, in particular to an impurity removal and crystallization device for crude p-aminobenzenesulfonic acid. Background Art

[0002] p-Aminobenzenesulfonic acid is an important organic compound, a common dye intermediate and a raw material for aminosulfonate superplasticizers. It is primarily used in the manufacture of dyes and pesticides, and is also an intermediate in a variety of chemicals, including Reactive Brilliant Red K-2B, Brilliant Red K2BP, Brilliant Red K-2G, Brilliant Red M-2B, Brilliant Red XB, Brilliant Red X-10B, and Reactive Violet K-3R. Prior art processes for the removal of impurities and crystallization of crude p-aminobenzenesulfonic acid lack effective decolorization, resulting in an impure color in the recrystallized product, impacting both the product's appearance quality and market acceptance. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the utility model provides a device for removing impurities and crystallizing crude p-aminobenzenesulfonic acid, which solves the problem in the existing technology that when crude p-aminobenzenesulfonic acid is removed and crystallized, the crude product lacks effective decolorization, resulting in the color of the recrystallized product being not pure enough, affecting the appearance quality and market acceptance of the product.

[0004] To achieve the above-mentioned purpose, the present invention is implemented by the following technical scheme: a device for removing impurities and crystallizing a crude sulfanilic acid product, comprising a catalyst settling kettle, a crude product feed port is provided on one side of the catalyst settling kettle, a hydrogen feed port is provided on the top of the catalyst settling kettle, a catalyst recovery discharge port is provided on the bottom of the catalyst settling kettle, a first purified liquid discharge port is provided on the side of the catalyst settling kettle away from the crude product feed port, the end of the first purified liquid discharge port away from the catalyst settling kettle is connected to a first membrane filtration kettle, and the outer wall of the first membrane filtration kettle has A first solid separation discharge port, a second purified liquid discharge port is provided on the outer wall of the first membrane filtration kettle, the second purified liquid discharge port is connected to a decolorization kettle at one end away from the first membrane filtration kettle, activated carbon is provided inside the decolorization kettle, the output end of the decolorization kettle is connected to a purified liquid feed port, the other end of the purified liquid feed port is connected to a distillation kettle, a third purified liquid discharge port is provided at the bottom of the distillation kettle, the other end of the third purified liquid discharge port is connected to a crystallization kettle, the output end of the crystallization kettle is connected to a centrifuge, and a pure product discharge port is provided on one side of the centrifuge.

[0005] Preferably, a centrifuge outlet is provided on one side of the centrifuge, the other end of the centrifuge outlet is connected to a dilution tank, a solvent inlet is provided on the top of the dilution tank, and the output end of the dilution tank is connected to the decolorization kettle.

[0006] Preferably, the first solid separation discharge port is connected to a second membrane filtration kettle at one end away from the first membrane filtration kettle, the output end of the second membrane filtration kettle is connected to the second purified liquid discharge port, and a second solid separation discharge port is provided on one side of the second membrane filtration kettle.

[0007] Preferably, the output end of the decolorization kettle is connected to a third membrane filtration kettle, and the output end of the third membrane filtration kettle is connected to a feed port of the purified liquid.

[0008] Preferably, a solvent vapor outlet is provided at the top of the distillation kettle.

[0009] The utility model has the following beneficial effects: the impurity removal and crystallization device for the crude p-aminobenzenesulfonic acid product, through the coordination among the catalyst settling kettle, the crude product feed port, the hydrogen feed port, the catalyst recovery discharge port, the first purified liquid discharge port, the first membrane filtration kettle, the first solid separation discharge port, the second purified liquid discharge port, the decolorization kettle, the activated carbon, the purified liquid feed port, the distillation kettle, the third purified liquid discharge port, the crystallization kettle, the centrifuge and the pure product discharge port, catalytically separates the crude p-aminobenzenesulfonic acid product, separates and filters the catalytically separated material, thereby improving the purity of the p-aminobenzenesulfonic acid; the filtered material enters the decolorization kettle through the second purified liquid discharge port, is decolorized by the activated carbon, and then undergoes a desolventizing and purification process to obtain pure p-aminobenzenesulfonic acid; while ensuring the purity of the p-aminobenzenesulfonic acid, the color clarity of the p-aminobenzenesulfonic acid product can be improved, thereby improving the appearance quality and market acceptance of the product, thereby helping to enhance the competitiveness of the product.

[0010] The centrifuge liquid produced after the p-aminobenzenesulfonic acid material is centrifuged and purified enters the dilution tank through the centrifuge liquid outlet through the decolorization kettle, the centrifuge, the centrifuge liquid outlet, the dilution tank and the solvent inlet. The p-aminobenzenesulfonic acid material is diluted to a specified concentration by adding a solvent to the dilution tank, and is then transported to the decolorization kettle again for secondary treatment, thereby improving resource utilization and product quality and avoiding material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of the utility model.

[0012] In the figure: 1. Catalyst settling kettle; 2. Crude product feed port; 3. Hydrogen feed port; 4. Catalyst recovery discharge port; 5. First purified liquid discharge port; 6. First membrane filtration kettle; 7. First solid separation discharge port; 8. Second purified liquid discharge port; 9. Decolorization kettle; 10. Activated carbon; 11. Purified liquid feed port; 12. Distillation kettle; 13. Third purified liquid discharge port; 14. Crystallization kettle; 15. Centrifuge; 16. Pure product discharge port; 17. Centrifuge outlet; 18. Dilution tank; 19. Solvent inlet; 20. Second membrane filtration kettle; 21. Second solid separation discharge port; 22. Third membrane filtration kettle; 23. Solvent vapor outlet. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0014] In the prior art, when crude p-aminobenzenesulfonic acid is subjected to impurity removal and crystallization, there is a lack of effective decolorization of the crude product, resulting in the color of the recrystallized product being impure, which affects the appearance quality and market acceptance of the product.

[0015] In view of this, the present invention provides an impurity removal and crystallization device for crude p-aminobenzenesulfonic acid, which cooperates with a catalyst settling kettle, a crude product feed port, a hydrogen feed port, a catalyst recovery discharge port, a first purified liquid discharge port, a first membrane filtration kettle, a first solid separation discharge port, a second purified liquid discharge port, a decolorization kettle, activated carbon, a purified liquid feed port, a distillation kettle, a third purified liquid discharge port, a crystallization kettle, a centrifuge and a pure product discharge port. The crude p-aminobenzenesulfonic acid is catalytically separated, and the catalyzed material is separated and filtered to improve the purity of the p-aminobenzenesulfonic acid. The filtered material enters the decolorization kettle through the second purified liquid discharge port, is decolorized by activated carbon, and then undergoes a desolventizing and purification process to obtain pure p-aminobenzenesulfonic acid. While ensuring the purity of the p-aminobenzenesulfonic acid, the color clarity of the p-aminobenzenesulfonic acid product is improved, thereby improving the appearance quality and market acceptance of the product.

[0016] Through the use of wires by those skilled in the art, all electrical components in this case are connected to their corresponding power supplies, and appropriate controllers and encoders should be selected according to actual conditions to meet control requirements. The specific connection and control sequence should refer to the following working principle, in which the electrical components are electrically connected in sequence. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and no longer explains the electrical control.

[0017] Depend on Figure 1 It can be seen that a device for removing impurities and crystallizing a crude p-aminobenzenesulfonic acid product comprises a catalyst settling kettle 1, a crude product feed port 2 is provided on one side of the catalyst settling kettle 1, a hydrogen feed port 3 is provided on the top of the catalyst settling kettle 1, a catalyst recovery discharge port 4 is provided on the bottom of the catalyst settling kettle 1, a first purified liquid discharge port 5 is provided on the side of the catalyst settling kettle 1 away from the crude product feed port 2, the first purified liquid discharge port 5 is connected to the first membrane filtration kettle 6 at one end away from the catalyst settling kettle 1, the outer wall of the first membrane filtration kettle 6 is provided with a first solid separation discharge port 7, and the first membrane filtration kettle 6 is provided with a first solid separation discharge port 7. The outer wall of the kettle 6 is provided with a second purified liquid discharge port 8, and the end of the second purified liquid discharge port 8 away from the first membrane filtration kettle 6 is connected to the decolorization kettle 9, and the interior of the decolorization kettle 9 is provided with activated carbon 10. The output end of the decolorization kettle 9 is connected to a purified liquid feed port 11, and the other end of the purified liquid feed port 11 is connected to a distillation kettle 12. The bottom of the distillation kettle 12 is provided with a third purified liquid discharge port 13, and the other end of the third purified liquid discharge port 13 is connected to a crystallization kettle 14. The output end of the crystallization kettle 14 is connected to a centrifuge 15, and a pure product discharge port 16 is provided on one side of the centrifuge 15;

[0018] In the specific implementation process, it is worth noting that, through the coordination between the catalyst settling kettle 1, the crude product feed port 2, the hydrogen feed port 3, the catalyst recovery discharge port 4 and the first purified liquid discharge port 5, the crude p-aminobenzenesulfonic acid feed port 2 and the first purified liquid discharge port 5 are respectively provided at different positions in the middle section of the catalyst settling kettle 1, and the hydrogen feed port 3 and the catalyst recovery discharge port 4 are respectively provided at the top and the bottom. The crude p-aminobenzenesulfonic acid derived from the hydrogenation reactor enters the catalyst settling kettle 1 through the crude product feed port 2 and is settled in the catalyst settling kettle 1. After most of the catalyst is separated, the upper reaction liquid is subsequently transported through the first purified liquid discharge port 5, and the separated catalyst is transported by The catalyst is recovered at the discharge port 4 for recycling to achieve catalytic separation of the crude p-aminobenzenesulfonic acid. The catalyst and the material are further separated and filtered through the cooperation among the first purified liquid discharge port 5, the first membrane filtration kettle 6, the first solid separation discharge port 7 and the second purified liquid discharge port 8. The filtered material enters the second purified liquid discharge port 8, and the separated material enters the first solid separation discharge port 7 for subsequent treatment. Through the cooperation among the second purified liquid discharge port 8, the decolorization kettle 9, the activated carbon 10 and the purified liquid feed port 11, the filtered material enters the decolorization kettle 9 through the second purified liquid discharge port 8, is decolorized by the activated carbon 10, and the decolorized material enters the purified liquid. The purified liquid feed port 11 is connected with the purified liquid feed port 11, the distillation kettle 12, the third purified liquid discharge port 13, the crystallization kettle 14, the centrifuge 15 and the pure product discharge port 16. The material that has completed the decolorization treatment enters the distillation kettle 12 through the purified liquid feed port 11 for desolvation, and the solvent is recovered for recycling. The material is then purified by the crystallization kettle 14 and the centrifuge 15 to complete the purification process of the crude aminobenzenesulfonic acid, and the pure aminobenzenesulfonic acid is obtained through the pure product discharge port 16. The material is then filtered through the catalyst settling kettle 1, the crude product feed port 2, the hydrogen feed port 3, the catalyst recovery discharge port 4, the first purified liquid discharge port 5, the first membrane filtration kettle 6, the first solid separation discharge port 7, and the first solid separation discharge port 8. The coordination among the feed port 7, the second purified liquid discharge port 8, the decolorizing kettle 9, the activated carbon 10, the purified liquid feed port 11, the distillation kettle 12, the third purified liquid discharge port 13, the crystallization kettle 14, the centrifuge 15 and the pure product discharge port 16 improves the purity of the p-aminobenzenesulfonic acid by catalytically separating the crude p-aminobenzenesulfonic acid and separating and filtering the catalytically separated material. The filtered material enters the decolorizing kettle 9 through the second purified liquid discharge port 8, is decolorized by the activated carbon 10, and then undergoes a desolventizing and purification process to obtain pure p-aminobenzenesulfonic acid. While ensuring the purity of the p-aminobenzenesulfonic acid, the color clarity of the p-aminobenzenesulfonic acid product is improved, thereby improving the appearance quality and market acceptance of the product.

[0019] Furthermore, a centrifuge outlet 17 is provided on one side of the centrifuge 15, the other end of the centrifuge outlet 17 is connected to a dilution tank 18, a solvent inlet 19 is provided on the top of the dilution tank 18, and the output end of the dilution tank 18 is connected to the decolorization kettle 9;

[0020] In the specific implementation process, it is worth noting that, through the decolorization kettle 9, the centrifuge 15, the centrifuge outlet 17, the dilution tank 18 and the solvent inlet 19, the centrifuge generated after the p-aminobenzenesulfonic acid material is centrifuged and purified enters the dilution tank 18 through the centrifuge outlet 17, and by adding the solvent to the dilution tank 18, the p-aminobenzenesulfonic acid material is diluted to a specified concentration and transported to the decolorization kettle 9 again for secondary treatment, thereby improving resource utilization and product quality and avoiding material waste;

[0021] Furthermore, the end of the first solid separation outlet 7 away from the first membrane filtration kettle 6 is connected to the second membrane filtration kettle 20, the output end of the second membrane filtration kettle 20 is connected to the second purified liquid outlet 8, and a second solid separation outlet 21 is provided on one side of the second membrane filtration kettle 20;

[0022] During the specific implementation process, it is worth noting that, through the coordination among the first membrane filtration kettle 6, the first solid separation discharge port 7, the second purified liquid discharge port 8, the second membrane filtration kettle 20 and the second solid separation discharge port 21, after the first membrane filtration kettle 6 completes the filtration of the liquid material, the discharged primary purified liquid containing smaller particle impurities and incompletely separated solid matter is subjected to secondary filtration by the second membrane filtration kettle 20, the liquid material filtered by the second membrane filtration kettle 20 is subsequently decolorized, and the purified liquid containing smaller particle impurities and incompletely separated solid matter is discharged through the second solid separation discharge port 21 for subsequent treatment;

[0023] Furthermore, the output end of the decolorization kettle 9 is connected to the third membrane filtration kettle 22, and the output end of the third membrane filtration kettle 22 is connected to the purified liquid feed port 11;

[0024] In the specific implementation process, it is worth noting that, through the coordination between the decolorization kettle 9, the purified liquid feed port 11, the distillation kettle 12 and the third membrane filter kettle 22, after the decolorization treatment of the liquid material is completed, it is filtered again through the third membrane filter kettle 22 to further ensure the purity of the aminobenzenesulfonic acid material;

[0025] Furthermore, a solvent vapor outlet 23 is provided at the top of the distillation kettle 12, and the solvent vapor outlet 23 is used to recover the solvent vapor to improve the utilization rate of the solvent;

[0026] During the specific implementation process, it is worth noting that the solvent vapor outlet 23 is used to recover the solvent vapor to improve the utilization rate of the solvent.

[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for removing impurities and crystallizing crude p-aminobenzenesulfonic acid, comprising a catalyst settling kettle (1), characterized in that: A crude product feed port (2) is provided on one side of the catalyst settling kettle (1), a hydrogen feed port (3) is provided on the top of the catalyst settling kettle (1), a catalyst recovery discharge port (4) is provided on the bottom of the catalyst settling kettle (1), a first purified liquid discharge port (5) is provided on the side of the catalyst settling kettle (1) away from the crude product feed port (2), an end of the first purified liquid discharge port (5) away from the catalyst settling kettle (1) is connected to a first membrane filtration kettle (6), a first solid separation discharge port (7) is provided on the outer wall of the first membrane filtration kettle (6), and a second purified liquid discharge port (8) is provided on the outer wall of the first membrane filtration kettle (6). The end of the second purified liquid discharge port (8) away from the first membrane filtration kettle (6) is connected to a decolorization kettle (9), and activated carbon (10) is arranged inside the decolorization kettle (9). The output end of the decolorization kettle (9) is connected to a purified liquid feed port (11), and the other end of the purified liquid feed port (11) is connected to a distillation kettle (12). A third purified liquid discharge port (13) is arranged at the bottom of the distillation kettle (12), and the other end of the third purified liquid discharge port (13) is connected to a crystallization kettle (14). The output end of the crystallization kettle (14) is connected to a centrifuge (15), and a pure product discharge port (16) is arranged on one side of the centrifuge (15).

2. The impurity removal crystallization device for crude sulfanilic acid according to claim 1, wherein: A centrifuge outlet (17) is provided on one side of the centrifuge (15), the other end of the centrifuge outlet (17) is connected to a dilution tank (18), a solvent inlet (19) is provided on the top of the dilution tank (18), and the output end of the dilution tank (18) is connected to the decolorization kettle (9).

3. The impurity removal crystallization device for crude sulfanilic acid according to claim 1, wherein: The end of the first solid separation outlet (7) away from the first membrane filtration kettle (6) is connected to the second membrane filtration kettle (20), the output end of the second membrane filtration kettle (20) is connected to the second purified liquid outlet (8), and a second solid separation outlet (21) is provided on one side of the second membrane filtration kettle (20).

4. The impurity removal crystallization device for crude sulfanilic acid according to claim 1, wherein: The output end of the decolorization kettle (9) is connected to the third membrane filtration kettle (22), and the output end of the third membrane filtration kettle (22) is connected to the purified liquid feed port (11).

5. The impurity removal crystallization device for crude sulfanilic acid according to claim 1, characterized in that: A solvent vapor outlet (23) is provided at the top of the distillation kettle (12).

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