Selective efficient purification device for adipic acid

Abstract

The utility model discloses a selective efficient purification device for adipic acid. The selective efficient purification device comprises an oxidation balance tank for storing an adipic acid mixture, the oxidation balance tank is communicated with the crude acid crystallization purification mechanism through a material pipeline, the crude acid crystallization purification mechanism is communicated with the refined acid crystallization feeding tank through a material pipeline, and the refined acid crystallization feeding tank is communicated with the refined acid crystallization purification mechanism through a material pipeline; the refined acid crystallization and purification mechanism is communicated with the super-refined acid crystallization and purification mechanism through a material pipeline, and a ball valve A and a ball valve B for controlling the running direction of an adipic acid material are arranged on the material pipeline for communicating the two purification mechanisms. The device can be used for selectively preparing a super-refined adipic acid finished product and a refined adipic acid finished product, the high-end application requirement of the market is met, meanwhile, the production procedures can be flexibly adjusted according to the market supply and demand relation, and meanwhile the diversified requirement of the market is met.

Description

Technical Field

[0001] This utility model relates to the technical field of adipic acid production equipment, and in particular to a selective and efficient purification device for adipic acid. Background Technology

[0002] Adipic acid, as an important organic chemical raw material, has wide applications in the production of polymer materials such as polyamides. With the increasing demands for product quality in related industries, the requirements for the purity of adipic acid are becoming increasingly stringent. On the one hand, traditional adipic acid production processes have limitations in removing impurities, especially nitrates and iron ions, making it difficult to meet market demand for ultra-high purity adipic acid. On the other hand, if new production lines are built to improve the purity of adipic acid and further reduce its impurity content, enterprises need to bear huge costs and risks. The purchase and commissioning of specialized equipment is not only costly but also involves a long construction period. Furthermore, market demand is volatile, and the capacity utilization rate of new production lines is difficult to predict, easily leading to resource idleness and waste. Therefore, there is an urgent need for a more economical, efficient, and selectively efficient device for purifying adipic acid. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a selective and efficient purification device for adipic acid.

[0004] The technical solution of this utility model is:

[0005] A selective and efficient purification device for adipic acid, characterized in that it includes an oxidation equilibrium tank for storing a mixture of adipic acid;

[0006] The output port of the oxidation equilibrium tank is connected to a crude acid crystallization and purification mechanism through a material pipeline, and the output port of the crude acid crystallization and purification mechanism is connected to the input port of the refined acid crystallization feed tank through a material pipeline.

[0007] The material pipeline connected to the outlet of the refined acid crystallization feed tank includes a first feed tank pipeline and a second feed tank pipeline connected to the first feed tank pipeline; the outlet of the second feed tank pipeline is connected to the inlet of the second refined acid crystallizer, the outlet of the second refined acid crystallizer is connected to the refined acid slurry tank A through material pipeline A, and the outlet of the refined acid slurry tank A is connected in sequence to the refined acid thickening component A, the refined acid centrifuge A, the fluidized bed dryer and cooler, and the finished product silo through material pipelines;

[0008] The first pipeline outlet of the feed tank is connected to the first refined acid crystallizer, the first refined acid crystallizer outlet is connected to the material pipeline C, the end of the material pipeline C is connected to the material pipeline A, and the material pipeline C is connected to the material pipeline B.

[0009] Ball valve A is installed on material pipeline C and is located below the connection between material pipeline C and material pipeline B. Ball valve B is installed on material pipeline B and is located below the connection between material pipeline C and material pipeline B.

[0010] The output port of material pipeline B is connected to the refined acid slurry tank B. The output port of the refined acid slurry tank B is connected to the ultra-refined acid crystallization and purification mechanism through the material pipeline. The ultra-refined acid crystallization and purification mechanism includes a refined acid thickening component B, a refined acid centrifuge B, an activated carbon filter component B, an ultra-refined acid crystallizer, an ultra-refined acid thickening component, an ultra-refined acid centrifuge, an ultra-refined acid fluidized bed dryer and cooler, and an ultra-refined acid finished product silo, which are connected in sequence through the material pipeline.

[0011] The material pipeline is equipped with a power pump that provides the power for material transport.

[0012] Furthermore, the crude acid crystallization and purification mechanism includes a first crude acid crystallizer, a first crude acid slurry tank, a first crude acid thickener, a first intermediate slurry tank, a first crude acid centrifuge, a crude acid dissolving tank, and an activated carbon treatment component A, which are sequentially connected through material pipelines; the output port of the oxidation equilibrium tank is connected to the input port of the first crude acid crystallizer through a material pipeline, and the output port of the activated carbon treatment component A is connected to the input port of the refined acid crystallization feed tank through a material pipeline.

[0013] Furthermore, the material pipeline connected to the output port of the oxidation equilibrium tank includes a first equilibrium tank pipeline and a second equilibrium tank pipeline connected to the first equilibrium tank pipeline, and the output port of the first equilibrium tank pipeline is connected to the input port of the first crude acid crystallizer.

[0014] The output port of the second pipeline of the balance tank is connected to the second crude acid crystallizer. The output port of the second crude acid crystallizer is connected in sequence to the second crude acid slurry tank, the second crude acid thickener, the second intermediate slurry tank and the second crude acid centrifuge through the material pipeline. The output port of the second crude acid centrifuge is connected to the input port of the crude acid dissolving tank through the material pipeline.

[0015] Furthermore, the plate heat exchanger outlet is equipped with a pure water pipeline, which is connected to the material pipeline at the outlet of the refined acid centrifuge B, and the material pipeline at the outlet of the refined acid centrifuge B is connected to the refined acid dissolving tank; the outlet of the refined acid dissolving tank is connected to the activated carbon filter assembly B through the material pipeline.

[0016] Furthermore, the acid thickening component A includes an acid thickener A, an acid thickener water extraction pump A, and a thickener backwashing high-level tank A;

[0017] The outlet of the acid slurry tank A is connected to the inlet of the acid thickener A through a material pipeline. The backwashing high-level tank A of the thickener is located above the acid thickener A, and the two are connected through a material pipeline. The acid thickener water extraction pump A is connected to the material pipeline connecting the two.

[0018] Furthermore, the material pipeline connected to the outlet of the refined acid slurry tank A includes a first pipeline of slurry tank A and a second pipeline of slurry tank A arranged in parallel. The first pipeline of slurry tank A and the second pipeline of slurry tank A are respectively connected in sequence to a refined acid thickening component A, a refined acid centrifuge A, and a fluidized bed dryer / cooler. The material pipeline at the outlet of one fluidized bed dryer / cooler is connected to the material pipeline at the outlet of the other fluidized bed dryer / cooler. Then, the material pipeline at the outlet of the fluidized bed dryer / cooler is connected in sequence to the finished product silo and the packaging machine.

[0019] Furthermore, the activated carbon treatment component A includes an activated carbon treatment tank A and an activated carbon filter A connected in sequence through a material pipeline, and a power pump is provided on the material pipeline connecting the two to provide conveying power for the material movement.

[0020] Furthermore, the inlet of the oxidation equilibrium tank is connected to the outlet of the reactor via a material pipeline, the outlet of the alcohol-ketone tank is connected to one inlet of the reactor via a material pipeline, and the other inlet of the reactor is connected to the oxidizing acid inlet.

[0021] The beneficial technical effects of this utility model are:

[0022] Compared with the prior art, this utility model obtains ultra-high purity ultra-refined adipic acid by sequentially passing through a crude acid crystallization purification mechanism, a fine acid crystallization purification mechanism, and an ultra-refined acid purification mechanism. The ultra-refined adipic acid product has an adipic acid content (mass fraction) of 99.8%, and its impurity nitrate content is ≤0.1ppm, and its iron ion content is about 0.05ppm, which meets the needs of high-end applications in the market.

[0023] On the other hand, this utility model is designed with ball valve A and ball valve B. By controlling ball valve A and ball valve B, the adipic acid mixture can be selected to be purified by the crude acid crystallization purification mechanism and the fine acid crystallization purification mechanism in sequence to obtain the refined adipic acid product. The refined adipic acid product has an adipic acid content (mass fraction) of 99.8%, and its impurity nitrate content is about 1.5 ppm, and its impurity iron ion content is about 0.3 ppm.

[0024] Alternatively, a portion of the adipic acid mixture can be purified sequentially through a crude acid crystallization purification unit and a refined acid crystallization purification unit to obtain refined adipic acid product. Another portion of the adipic acid mixture can be purified sequentially through the crystallizers in the crude acid crystallization purification unit and the refined acid crystallization purification unit, and then enter the ultra-refined acid purification unit to obtain ultra-refined adipic acid product. This allows for the simultaneous production of adipic acid products of different qualities on a single production line, based on market supply and demand, thus meeting diverse market needs.

[0025] Furthermore, by adding ball valves A and B to the refined acid crystallization and purification mechanism, it is cleverly connected to the ultra-refined acid purification mechanism, thus avoiding the high costs and long construction period associated with building a new ultra-high purity adipic acid production line. This fully and effectively utilizes existing production equipment and reduces the cost and risk of building a new production line. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the selective and efficient purification device for adipic acid shown in Example 1.

[0027] Figure 2 This is a schematic diagram of the selective and efficient purification device for adipic acid shown in Example 2. Detailed Implementation

[0028] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0029] Example 1

[0030] like Figure 1 As shown in the figure, this embodiment 1 provides a selective and efficient purification device for adipic acid, which includes a reaction mechanism, a crude acid crystallization purification mechanism, a refined acid crystallization purification mechanism and an ultra-refined acid purification mechanism, wherein the red arrow indicates the running direction of the adipic acid material.

[0031] The reaction apparatus includes an alcohol-ketone tank 1 for storing alcohol-ketone raw materials, a reactor 2, and an oxidation equilibrium tank 3. The outlet of the alcohol-ketone tank 1 is connected to one inlet of the reactor 2 via a material pipeline, and the other inlet of the reactor 2 is connected to the inlet of the oxidizing acid. Figure 1 The green arrow in the middle indicates the direction of oxidizing acid entry. The outlet of reactor 2 is connected to oxidation equilibrium tank 3. Alcohol and ketone raw materials in alcohol and ketone tank 1 enter reactor 2 and react with oxidizing acid in reactor 2. The adipic acid mixture produced after the reaction is stored in oxidation equilibrium tank 3.

[0032] In Example 1, the oxidation equilibrium tank 3 is connected to a crude acid crystallization and purification mechanism via a material pipeline. The crude acid crystallization and purification mechanism includes a first crude acid crystallizer 5, a crude acid slurry tank 8, a first crude acid thickener 16, a first intermediate slurry tank 17, a first crude acid centrifuge 18, a crude acid dissolving tank 19, and an activated carbon treatment component A, which are connected in sequence via material pipelines. The activated carbon treatment component A includes an activated carbon treatment tank A20 and an activated carbon filter A21, which are connected in sequence via material pipelines. Each of the material pipelines connecting the oxidation equilibrium tank 3 and the first crude acid crystallizer 5, the first crude acid crystallizer 5 and the crude acid slurry tank 8, and the activated carbon treatment tank A and the activated carbon filter A21 is equipped with a power pump 000 to provide conveying power for material movement.

[0033] The adipic acid mixture in the oxidation equilibrium tank 3 is transported to the first crude acid crystallizer 5 for primary crystallization under the action of the power pump 000. After crystallization, the crude adipic acid slurry is sequentially transported to the crude acid slurry tank 8 under the action of the power pump 000, and then to the first crude acid thickener 16 for concentration. After concentration, the crude adipic acid settles into the first intermediate slurry tank 17, and then enters the first crude acid centrifuge 18 for centrifugal separation. The separated crude adipic acid enters the crude acid dissolving tank 19 for dissolution. Then, the material in the crude acid dissolving tank 19 overflows into the activated carbon treatment tank A20 for activated carbon adsorption decolorization, and then is transported to the activated carbon filter A21 for filtration under the action of the power pump 000. The filtered adipic acid solution is stored in the refined acid crystallization feed tank 23, thus completing the first crystallization and purification process of the adipic acid mixture.

[0034] The outlet of the refined acid crystallization feed tank 23 is connected to the refined acid crystallization purification mechanism through a material pipeline. The adipic acid solution in the refined acid crystallization feed tank 23 completes the second crystallization purification process through the refined acid crystallization purification mechanism.

[0035] Specifically, the material pipeline connected to the output port of the refined acid crystallization feed tank 23 includes a first feed tank pipeline 231 and a second feed tank pipeline 232 connected to the first feed tank pipeline 231. A power pump 000 is installed on the first feed tank pipeline 231 and is located near the bottom of the refined acid crystallization feed tank 23 at the connection between the first feed tank pipeline 231 and the second feed tank pipeline 232. The output port of the second feed tank pipeline 232 is connected to the input port of the second refined acid crystallizer 27. The output port of the second refined acid crystallizer 27 is connected to the refined acid slurry tank A29 through the material pipeline A271. A power pump 000 is installed on the material pipeline connecting the two.

[0036] The aforementioned feed tank first pipeline 231 is connected to the first refined acid crystallizer 25. The output port of the first refined acid crystallizer 25 is connected to the material pipeline C251. A power pump 000 is installed on the material pipeline C251 near the first refined acid crystallizer 25. The end of the output port of the material pipeline C251 is connected to the material pipeline A271. The material pipeline C is also connected to the material pipeline B252. Ball valve A68 is installed on the material pipeline C251, located below the connection between the material pipeline C251 and the material pipeline B252. Ball valve B69 is installed on the material pipeline B, located below the connection between the material pipeline C251 and the material pipeline B.

[0037] The outlet of the aforementioned refined acid slurry tank A29 is connected to the refined acid thickening component A via a material pipeline. The refined acid thickening component A includes a refined acid thickener A33, a refined acid thickener water extraction pump A34, and a thickener backwashing high-level tank A32. The outlet of the refined acid slurry tank A29 is connected to the inlet of the refined acid thickener A33 via a material pipeline. The thickener backwashing high-level tank A32 is located above the refined acid thickener A33, and the two are connected via a material pipeline. The refined acid thickener water extraction pump A34 is connected to the material pipeline connecting the two. The outlet of the refined acid thickener A33 is sequentially connected to the refined acid centrifuge A35, the fluidized bed dryer / cooler 40, the finished product silo 42, and the packaging machine 43 via a material pipeline.

[0038] When ball valve A68 is open and ball valve B69 is closed, the adipic acid solution in the refined acid crystallization feed tank 23, under the action of the power pump 000, is partially transported to the first refined acid crystallizer 25 for secondary crystallization, and the other part is transported to the second refined acid crystallizer 27 for secondary crystallization. The adipic acid slurry after secondary crystallization in the first refined acid crystallizer 25 enters the refined acid slurry tank A29 sequentially through material pipeline C251 and material pipeline A271. The adipic acid slurry after secondary crystallization in the second refined acid crystallizer 27 also enters the refined acid slurry tank A29 through material pipeline A271. The refined acid slurry tank A29... The adipic acid solution in 9 is transported to the acid thickener A33 by the power pump 000. The mother liquor water in the acid thickener A33 is pumped to the backwash high-level tank A32 by the acid thickener water pump A34. The excess mother liquor water overflows from the upper end of the backwash high-level tank A32 to the first-line mother liquor acid tank (not shown, where the blue arrow indicates the direction of excess mother liquor water outflow). The thickened material in the acid thickener A33 enters the acid centrifuge A35 for centrifugation. After centrifugation, the material enters the fluidized bed dryer and cooler 40 for drying and cooling. Then, it is transported to the finished product silo 42 through the material pipeline and then discharged to the packaging machine 43 for packaging.

[0039] At this point, the adipic acid mixture has completed the second crystallization and purification process, yielding refined adipic acid product. The refined adipic acid product has an adipic acid content (mass fraction) of 99.8%, and the impurity nitrate content is approximately 1.5 ppm, and the impurity iron ion content is approximately 0.3 ppm.

[0040] To further increase the adipic acid content and reduce the nitrate and iron ion content in the finished adipic acid product, the output port of material pipeline B252 is connected to the ultra-refined acid crystallization and purification mechanism, so that the adipic acid solution after secondary crystallization in the first refined acid crystallizer 25 undergoes a third purification process in the ultra-refined acid crystallization and purification mechanism.

[0041] Specifically, the output port of material pipeline B252 is connected to the refined acid slurry tank B52. The refined acid slurry tank B52 is connected to the refined acid thickening assembly B via a material pipeline. The refined acid thickening assembly B includes a refined acid thickener B55, a refined acid thickener water extraction pump B57, and a thickener backwashing high-level tank B54. Their connection relationship and operation are the same as those of the refined acid thickening assembly A mentioned above, and will not be repeated here. The refined acid thickener B55 is connected to the refined acid centrifuge B56 via a material pipeline. The output port of the refined acid centrifuge B56 is connected to the material pipeline... The acid dissolving tank 44 is connected to the plate heat exchanger 58, and the outlet of the plate heat exchanger 58 is equipped with a pure water pipeline 581. The pure water pipeline 581 is connected to the material pipeline of the outlet of the acid centrifuge B56. The outlet of the acid dissolving tank 44 is connected to the activated carbon filter assembly B through the material pipeline. The activated carbon filter assembly B includes an activated carbon treatment tank B45 and an activated carbon filter B46. Its function and connection method are the same as those of the activated carbon filter assembly A mentioned above, and will not be repeated here. The outlet of the activated carbon filter B46 is connected to the material pipeline in sequence. The system includes an ultra-fine acid feed tank 48, an ultra-fine acid crystallizer 50, an ultra-fine acid slurry tank 59, and an ultra-fine acid thickening assembly. The ultra-fine acid thickening assembly comprises an ultra-fine acid thickener 62, an ultra-fine acid thickener water extraction pump 63, and an ultra-fine acid thickener backwashing high-level tank 61. The connection relationships and operating methods of the components in the ultra-fine acid thickening assembly are the same as those in the fine acid thickening assembly B, and will not be repeated here. The output port of the ultra-fine acid thickener 62 is connected sequentially to an ultra-fine acid centrifuge 64, an ultra-fine acid fluidized bed dryer / cooler 65, and an ultra-fine acid... The finished product silo 66 and the ultra-fine acid packaging machine 67 are equipped with power pumps 000 on the following material pipelines: material pipeline B252 connected to the ultra-fine acid thickener B55, material pipeline B45 connected to the activated carbon treatment tank B46, material pipeline B48 connected to the ultra-fine acid feed tank 48 connected to the ultra-fine acid crystallizer 50, material pipeline B40 connected to the ultra-fine acid slurry tank 59, and material pipeline B49 connected to the ultra-fine acid thickener 62.

[0042] When ball valve A68 is closed and ball valve B69 is open, the adipic acid slurry after secondary crystallization in the second refined acid crystallizer 27 is purified according to the above-mentioned second crystallization purification process to finally obtain refined adipic acid product. The adipic acid slurry after secondary crystallization in the first refined acid crystallizer 25 enters the refined acid slurry tank B52 through material pipeline C251 and material pipeline B252. After being thickened by the refined acid thickening component B, it enters the refined acid centrifuge B56 for centrifugation. After centrifugation, the material passes through the pure water pipeline 581 at the outlet of the plate heat exchanger 58. Pure water (PW) enters the plate heat exchanger 58. After heat exchange in the plate heat exchanger 58, it flows out through the pure water pipeline 581 and centrifuges. The mixed materials, after being dissolved in hot pure water, are centrifuged and enter the refined acid dissolving tank 44. Then, after decolorization and filtration by the activated carbon filter component B, they enter the ultra-refined acid feed tank 48. The adipic acid solution in the ultra-refined acid feed tank 48 is transported to the ultra-refined acid crystallizer 50 by the power pump 000 for the third crystallization. After the third crystallization, the adipic acid solution is transported to the ultra-refined acid slurry tank 59 by the power pump 000. Then, it is thickened by the ultra-refined acid thickening component and centrifuged by the refined acid centrifuge 64. Finally, the centrifuged material is dried and cooled by the ultra-refined acid fluidized bed dryer and cooler 65. After that, it is transported to the ultra-refined acid finished product silo 66 through the material pipeline and then discharged to the ultra-refined acid packaging machine 67 for packaging.

[0043] At this point, the adipic acid mixture has completed the third crystallization and purification process, yielding ultra-refined adipic acid product. The ultra-refined adipic acid product has an adipic acid content (mass fraction) of 99.8%, and the impurity nitrate content is ≤0.1ppm, while the iron ion content is approximately 0.05ppm.

[0044] Thus, this invention can not only purify and produce ultra-refined adipic acid, but also select the crystallization and purification process of the adipic acid mixture to obtain refined adipic acid according to the actual needs of customers, so as to meet different market demands.

[0045] Example 2

[0046] To increase production capacity, this utility model also includes the following design: Figure 2 The adipic acid selective and efficient purification device shown is different from that in Example 1 in that: (1) the oxidation balance tank 3 is connected in parallel to two crude acid crystallization purification mechanisms through two independent material pipelines; (2) the outlet of the refined acid slurry tank A29 is connected in parallel to two refined acid thickening components A, refined acid centrifuge A and fluidized bed dryer through two independent material pipelines to increase the raw material processing capacity. Other components and component connections are the same and will not be described in detail here.

[0047] The differences mentioned above (1) specifically include:

[0048] The material pipeline connected to the output port of the oxidation equilibrium tank 3 includes a first equilibrium tank pipeline 310 and a second equilibrium tank pipeline 320 connected to the first equilibrium tank pipeline 310. A power pump 000 is installed on the first equilibrium tank pipeline 310, located near the bottom of the oxidation equilibrium tank 3 at the connection point between the first equilibrium tank pipeline 310 and the second equilibrium tank pipeline 320. The first equilibrium tank pipeline 310 is connected to the input port of the first crude acid crystallizer 5, and the second equilibrium tank pipeline 320 is connected to the second crude acid crystallizer 6. The output port of the second crude acid crystallizer 6 is connected sequentially to the second crude acid slurry tank 11, the second crude acid thickener 13, the second intermediate slurry tank 14, and the second crude acid centrifuge 15 via material pipelines. The output port of the second crude acid centrifuge 15 is connected to the crude acid dissolving tank 19 via a material pipeline. At the inlet, a power pump 000 is installed on the material pipeline connecting the second crude acid crystallizer 6 and the second crude acid slurry tank 11, and on the material pipeline connecting the second crude acid slurry tank 11 and the second crude acid thickener 13. The power pump 000 on the first pipeline 310 of the balance tank transports a portion of the adipic acid mixture in the oxidation balance tank 3 to the first crude acid crystallizer 5 and another portion to the second crude acid crystallizer 6. After crystallization in the first and second crude acid crystallizers 5 and 6 respectively, the mixtures are thickened and centrifuged according to the above-mentioned process. Finally, both centrifuged products enter the crude acid dissolving tank 19 for dissolution. The material in the crude acid dissolving tank 19 is then stored in the refined acid crystallization feed tank 23 after being treated by the activated carbon treatment component A. Since the adipic acid mixture in the oxidation balance tank 3 undergoes the first crystallization purification process in two groups simultaneously, an effective supporting foundation is provided for improving the purification efficiency of adipic acid.

[0049] The differences mentioned above (2) specifically include:

[0050] The material pipeline connected to the outlet of the refined acid slurry tank A29 includes a first pipeline 291 and a second pipeline 292 of slurry tank A, which are arranged in parallel. The first pipeline 291 and the second pipeline 292 of slurry tank A are each connected in sequence to a refined acid thickening component A, a refined acid centrifuge A35, and a fluidized bed dryer / cooler 40. The material pipeline at the outlet of one fluidized bed dryer / cooler 40 is connected to the material pipeline at the outlet of the other fluidized bed dryer / cooler 40. Then, the material pipeline at the outlet of the fluidized bed dryer / cooler 40 is connected in sequence to the finished product silo 42 and the packaging machine 43. A power pump 000 is installed on both the first pipeline 291 and the second pipeline 292 of slurry tank A. The adipic acid solution in the refined adipic acid slurry tank A29 is thickened by the two refined adipic acid thickening components A, and then centrifuged by the two refined adipic acid centrifuges A35. The centrifuged materials are dried and cooled by the two fluidized bed dryers and coolers 40, and then transported to the finished product silo 42. Finally, the materials are fed to the packaging machine 43 for packaging, thereby obtaining the above-mentioned refined adipic acid finished product.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An apparatus for selective and efficient purification of adipic acid, characterized by: The oxidation balance tank (3) includes an oxidation balance tank (3) for storing adipic acid mixture; The output port of the oxidation balance tank (3) is connected to a crude acid crystallization purification mechanism through a material pipeline, and the output port of the crude acid crystallization purification mechanism is connected to the input port of a fine acid crystallization feed tank (23) through a material pipeline; The material pipeline connected to the output port of the fine acid crystallization feed tank (23) includes a feed tank first pipeline (231) and a feed tank second pipeline (232) connected to the feed tank first pipeline (231); the output port of the feed tank second pipeline (232) is connected to the input port of a second fine acid crystallizer (27), and the output port of the second fine acid crystallizer (27) is connected to a fine acid slurry tank A (29) through a material pipeline A (271); the output port of the fine acid slurry tank A (29) is sequentially connected to a fine acid thickening assembly A, a fine acid centrifuge A (35), a fluidized bed drying cooler (40) and a finished product bin (42) through a material pipeline. The output port of the feed tank first pipeline (231) is connected to a first fine acid crystallizer (25), and the output port of the first fine acid crystallizer (25) is connected to a material pipeline C (251); the end of the material pipeline C (251) is connected to the material pipeline A (271), and a material pipeline B (252) is connected to the material pipeline C (251); A ball valve A (68) is arranged on the material pipeline C (251) and located below the connection between the material pipeline C (251) and the material pipeline B (252); a ball valve B (69) is arranged on the material pipeline B (252) and located below the connection between the material pipeline C (251) and the material pipeline B (252); The output port of the material pipeline B (252) is connected to a fine acid slurry tank B (52), and the output port of the fine acid slurry tank B (52) is connected to a super-fine acid crystallization purification mechanism through a material pipeline; the super-fine acid crystallization purification mechanism includes a fine acid thickening assembly B, a fine acid centrifuge B (56), an activated carbon filtering assembly B, a super-fine acid crystallizer (50), a super-fine acid thickening assembly, a super-fine acid centrifuge (64), a super-fine acid fluidized bed drying cooler (65) and a super-fine acid finished product bin (66) connected in sequence through a material pipeline. A power pump (000) is arranged on the material pipeline to provide conveying power for the material.

2. The selective high-efficiency purification device of adipic acid according to claim 1, characterized in that: The crude acid crystallization purification mechanism includes a first crude acid crystallizer (5), a first crude acid slurry tank (8), a first crude acid thickener (16), a first intermediate slurry tank (17), a first crude acid centrifuge (18), a crude acid dissolving tank (19) and an activated carbon treatment assembly A connected in sequence through a material pipeline; the output port of the oxidation balance tank (3) is connected to the input port of the first crude acid crystallizer (5) through a material pipeline, and the output port of the activated carbon treatment assembly A is connected to the input port of the fine acid crystallization feed tank (23) through a material pipeline.

3. The selective high-efficiency purification device of adipic acid according to claim 2, characterized in that: The material pipeline connected to the output port of the oxidation balance tank (3) includes a balance tank first pipeline (310) and a balance tank second pipeline (320) connected to the balance tank first pipeline (310); the output port of the balance tank first pipeline (310) is connected to the input port of the first crude acid crystallizer (5). The second pipeline (320) of the balance tank is communicated with the second crude acid crystallizer (6), and the output of the second crude acid crystallizer (6) is communicated with the second crude acid slurry tank (11), the second crude acid thickener (13), the second intermediate slurry tank (14) and the second crude acid centrifuge (15) in sequence through the material pipeline, and the output of the second crude acid centrifuge (15) is communicated with the input of the crude acid dissolving tank (19) through the material pipeline.

4. The selective high-efficiency purification device of adipic acid according to claim 1, characterized in that: The output of the plate heat exchanger (58) is provided with a pure water pipeline (581), the pure water pipeline (581) is communicated with the material pipeline at the output of the fine acid centrifuge B (56), the material pipeline at the output of the fine acid centrifuge B (56) is communicated with the fine acid dissolving tank (44), and the output of the fine acid dissolving tank (44) is communicated with the active carbon filter assembly B through the material pipeline.

5. The selective high-efficiency purification device of adipic acid according to claim 1, characterized in that: The fine acid thickening assembly A comprises the fine acid thickener A (33), the fine acid thickener water extraction pump A (34) and the thickener backwashing high tank A (32). The output of the fine acid slurry tank A (29) is communicated with the input of the fine acid thickener A (33) through the material pipeline, the thickener backwashing high tank A (32) is arranged above the fine acid thickener A (33) and is communicated with the fine acid thickener A (33) through the material pipeline, and the material pipeline, which is communicated with the fine acid thickener A (33) and the thickener backwashing high tank A (32), is connected with the fine acid thickener water extraction pump A (34).

6. The selective high-efficiency purification device of adipic acid according to claim 5, characterized in that: The material pipeline, which is communicated with the output of the fine acid slurry tank A (29), comprises the slurry tank A first pipeline (291) and the slurry tank A second pipeline (292) arranged in parallel, the slurry tank A first pipeline (291) and the slurry tank A second pipeline (292) are each communicated with a fine acid thickening assembly A, a fine acid centrifuge A (35) and a fluidized bed drying cooler (40) in sequence, the material pipeline at the output of one fluidized bed drying cooler (40) is communicated with the material pipeline at the output of the other fluidized bed drying cooler (40), and then the material pipeline at the output of the fluidized bed drying cooler (40) is communicated with the finished product bin (42) and the packaging machine (43) in sequence.

7. The selective high-efficiency purification device of adipic acid according to claim 2, characterized in that: The active carbon treatment assembly A comprises the active carbon treatment tank A (20) and the active carbon filter A (21) connected in sequence through the material pipeline, and the power pump (000) for providing conveying power for material operation is arranged on the material pipeline, which is communicated with the active carbon treatment tank A (20) and the active carbon filter A (21).

8. The selective high-efficiency purification device of adipic acid according to claim 1, characterized in that: The input of the oxidation balance tank (3) is communicated with the output of the reactor (2) through the material pipeline, the output of the alcohol ketone tank (1) is communicated with the input of the reactor (2) through the material pipeline, and the other input of the reactor (2) is communicated with the oxidation acid input.

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