Industrial device for preparing electronic-grade NMP (N-Methyl Pyrrolidone) from waste NMP

Abstract

The utility model relates to an industrial device for preparing electronic-grade NMP (N-Methyl Pyrrolidone) by utilizing waste NMP. According to the industrial device for preparing the electronic-grade NMP from the waste NMP, the wastewater treatment assembly is arranged, so that in the using process of the industrial device, non-volatile and non-volatile components such as mechanical impurities and solid glue mixed in NMP waste liquid can be effectively separated; the filtering assembly is arranged, so that a good filtering effect can be achieved on the separated NMP waste liquid, and the highest level of NMP purity is achieved. The purification tank is arranged, and a first distillation plate, a second distillation plate and a third distillation plate are arranged in the purification tank, so that high-boiling-point impurities and other compound impurities can be selectively removed from NMP flow; the first filter, the second filter and the third filter are arranged in the filter assembly, so that the NMP flow can be purified in the final stage, any residual impurity fine particles or colloidal substances are eliminated, and the purity of the NMP is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of hazardous waste recycling, in particular to an industrial device for preparing electronic-grade NMP by utilizing waste NMP. Background Art

[0002] NMP is widely used in high-tech industries such as liquid crystal display, semiconductors and lithium batteries due to its excellent physical and chemical properties. After years of development, my country has reached a leading level in high-tech industries such as new energy, display panels, and LEDs. With the accelerated upgrading of chip products, the domestic semiconductor industry chain has also been further improved. With the upgrading of the industry, the use of high-quality NMP has continued to increase, and the amount of waste liquid after use has also increased. How to deal with the complex NMP waste liquid generated by the upstream industry and realize recycling has become a key issue in reducing the cost of industrial NMP use.

[0003] The waste liquid used by upstream enterprises contains large amounts of slag, high water content, and complex composition. It also introduces metal ion impurities, halogen impurities, nitrogen-containing compounds, phosphorus-containing compounds and other impurities, which are difficult and costly to treat.

[0004] In order to solve such problems, the present invention provides an environmentally friendly, energy-saving NMP recovery and purification device and process to meet the demand for regenerated electronic-grade NMP products. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides an industrial device for preparing electronic-grade NMP using waste NMP, which has the advantages of being able to recycle NMP waste liquid and solves the problem of high processing difficulty and high cost of traditional devices.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an industrial device for preparing electronic-grade NMP using waste NMP, comprising a workbench, on which a waste tank, a wastewater treatment component and a filter component are arranged;

[0007] The wastewater treatment component is provided with a slag removal tank, a slag discharge pipe is provided at the bottom of the slag removal tank, the other end of the slag discharge pipe is connected to the waste tank, a first suction pump is provided on the slag discharge pipe, a conduit is provided at the top of the slag discharge pipe, the other end of the conduit is connected to a dewatering tank, a drain pipe is provided at the top of the dewatering tank, the other end of the drain pipe is connected to the waste tank, a discharge pipe is provided at the bottom of the dewatering tank, the other end of the discharge pipe is connected to a purification tank, a second suction pump is provided on the discharge pipe, a sewage pipe is provided at the bottom of the purification tank, the other end of the sewage pipe is connected to the slag removal pipe, a connecting pipe is provided at the top of the purification tank, and the other end of the connecting pipe is fixedly connected to a connecting pipe;

[0008] The filtering assembly is provided with a first resin tower, a second resin tower and a filtering tank, the end of the connecting pipe away from the purification tank is connected with the first resin tower, the connecting pipe is provided with a third suction pump, filtering pipes are provided between the first resin tower, the second resin tower and the filtering tank, and the filtering pipes are provided with a fourth suction pump.

[0009] Furthermore, heaters are provided at the bottoms of the slag removal tank and the dehydration tank.

[0010] Furthermore, a control panel is provided on the purification tank.

[0011] Furthermore, the interior of the purification tank is provided with a first distillation plate, a second distillation plate, a third distillation plate and a first condenser, the first distillation plate is located below the discharge pipe, a first liquid discharge pipe is provided on the first distillation plate, a first liquid accumulation tray is fixedly connected to the top of the first liquid discharge pipe, and the first liquid accumulation tray is located below the first condenser.

[0012] Further, the bottom of the first liquid discharge pipe passes through the first distillation plate and is located above the second distillation plate, a second liquid accumulation tray is arranged on the first liquid discharge pipe, a second condenser is arranged between the first distillation plate and the second distillation plate, the second liquid accumulation tray is located below the second condenser, a second liquid discharge pipe is arranged on the second liquid accumulation tray, the other end of the second liquid discharge pipe passes through the second distillation plate and is located above the third distillation plate, a third liquid accumulation plate is arranged on the third distillation plate, a third condenser is arranged between the second distillation plate and the third distillation plate, the third liquid accumulation plate is located below the third condenser, a purification tube is arranged on the third liquid accumulation plate, and the top of the purification tube passes through the second distillation plate and the first distillation plate in sequence and passes through and is connected to the connecting tube.

[0013] Furthermore, a first filter, a second filter and a third filter are arranged in the filter tank.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0015] 1. The industrial device for preparing electronic-grade NMP using waste NMP is provided with a wastewater treatment component so that it can effectively separate mechanical impurities, solid glue and other non-volatile and difficult-to-volatile components mixed in NMP waste liquid during use, and can have a good purification effect on NMP waste liquid. By providing a filtering component, it can have a good filtering effect on the separated NMP waste liquid, so as to achieve the highest level of NMP purity.

[0016] Second, the industrial device for preparing electronic grade NMP from waste NMP is provided with a purification tank and a first distillation plate, a second distillation plate and a third distillation plate inside the purification tank so that high boiling point impurities and other compound impurities can be selectively removed from the NMP stream. The first filter, the second filter and the third filter are provided in the filter assembly so that the NMP stream can be purified in the final stage to eliminate any residual impurity fine particles or colloidal substances, thereby maintaining the purity of the NMP. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the wastewater treatment component of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the filter assembly of the utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the purification tank of the utility model;

[0021] Figure 5 This is a schematic diagram of the internal structure of the filter tank of the utility model.

[0022] In the figure: 1, workbench; 11, recovery tank; 2, wastewater treatment component; 201, slag removal tank; 202, slag discharge pipe; 203, first suction pump; 204, heater; 205, conduit; 206, dehydration tank; 207, discharge pipe; 208, second suction pump; 209, drain pipe; 210, purification tank; 211, control panel; 212, connecting pipe; 213, connecting pipe; 2131, third suction pump; 214, sewage pipe; 215, first distillation plate; 216, first condenser; 21 7. First liquid discharge pipe; 218. First liquid accumulation tray; 219. Second liquid accumulation tray; 220. Second distillation plate; 221. Second condenser; 222. Second liquid discharge pipe; 223. Third distillation plate; 224. Third liquid accumulation plate; 225. Purification tube; 226. Third condenser; 3. Filter assembly; 31. First resin tower; 32. Second resin tower; 33. Filter tank; 34. Filter tube; 35. Fourth suction pump; 331. First filter; 332. Second filter; 333. Third filter. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1:

[0025] See also Figure 1-3 In this embodiment, an industrial device for preparing electronic grade NMP using waste NMP includes a workbench 1, characterized in that: a waste tank 11, a wastewater treatment component 2 and a filtering component 3 are arranged on the workbench 1;

[0026] The wastewater treatment component 2 is provided with a slag removal tank 201, a slag discharge pipe 202 is provided at the bottom of the slag removal tank 201, the other end of the slag discharge pipe 202 is connected to the waste tank 11, a first suction pump 203 is provided on the slag discharge pipe 202, a guide tube 205 is provided at the top of the slag discharge pipe 202, the other end of the guide tube 205 is connected to a dewatering tank 206, a drain pipe 209 is provided at the top of the dewatering tank 206, the other end of the drain pipe 209 is connected to the waste tank 11, a discharge pipe 207 is provided at the bottom of the dewatering tank 206, the other end of the discharge pipe 207 is connected to a purification tank 210, a second suction pump 208 is provided on the discharge pipe 207, a sewage pipe 214 is provided at the bottom of the purification tank 210, the other end of the sewage pipe 214 is connected to the slag removal pipe 202, a connecting pipe 212 is provided at the top of the purification tank 210, and the other end of the connecting pipe 212 is fixedly connected to a connecting pipe 213;

[0027] The bottom of the slag removal tank 201 and the dehydration tank 206 are both provided with a heater 204. The heater 204 can effectively control the temperature in the slag removal tank 201 and the dehydration tank 206 during use;

[0028] As a preferred technical solution in this embodiment, the staff can first introduce NMP waste liquid into the deslagging tank 201, and then control the heater 204 to heat the waste liquid under negative pressure in the deslagging tank 201. The volatile components in the NMP raw material are vaporized and enter the dehydration tank 206 in gaseous form, and the non-volatile components in the NMP raw material enter the waste tank 11 through the slag discharge pipe 202. After the deslagging in the deslagging tank 201, the material enters the dehydration tank 206 in the form of gaseous feed. The staff can control the heater 204 to heat the inside of it so that the internal temperature is lower than the boiling point of NMP and higher than the boiling point of water, so that moisture or other impurities below the boiling point of NMP will enter the waste tank 11 through the drain pipe 209, thereby achieving the effect of dehydrating NMP. The dehydrated NMP waste liquid enters the purification tank 210 through the discharge pipe 207 under the action of the second suction pump 208 for further purification.

[0029] The filtering assembly 3 is provided with a first resin tower 31, a second resin tower 32 and a filtering tank 33. The end of the connecting pipe 213 away from the purification tank 210 is connected with the first resin tower 31. The connecting pipe 213 is provided with a third suction pump 2131. Filter pipes 34 are provided between the first resin tower 31, the second resin tower 32 and the filtering tank 33, and the filter pipes 34 are provided with a fourth suction pump 35.

[0030] As a preferred technical solution in this embodiment, the purified NMP will enter the first resin tower 31 through the connecting pipe 213 under the action of the first distillation plate 215, and in the first resin tower 31, it will pass through the multi-stage resin bed in the tower, be purified, and remove impurities, and then enter the second resin tower 32 for further purification and impurity removal, and finally enter the filter tank 33 for filtration.

[0031] A control panel 211 is provided on the purification tank 210. The control panel 211 enables the temperature inside the purification tank 210 to be precisely controlled, thereby ensuring the purification effect of the purification tank 210 on NMP.

[0032] Embodiment 2:

[0033] See also Figure 4-5In order to achieve the effect of purifying NMP, the interior of the purification tank 210 in this embodiment is provided with a first distillation plate 215, a second distillation plate 220, a third distillation plate 223 and a first condenser 216. The first distillation plate 215 is located below the discharge pipe 207. A first liquid discharge pipe 217 is provided on the first distillation plate 215. A first liquid accumulation tray 218 is fixedly connected to the top of the first liquid discharge pipe 217. The first liquid accumulation tray 218 is located below the first condenser 216. The bottom of the first liquid discharge pipe 217 passes through the first distillation plate 215 and is located above the second distillation plate 220. A second liquid accumulation tray 219 is provided on the first liquid discharge pipe 217. A second condenser 221 is provided between the first distillation plate 215 and the second distillation plate 220. The second liquid accumulation tray 219 is located below the second condenser 221. A second liquid discharge pipe 222 is provided on the second liquid accumulation tray 219. The other end of the second liquid discharge pipe 222 passes through the second distillation plate 220 and is located above the third distillation plate 223. A third liquid accumulation plate 224 is provided on the third distillation plate 223. A third condenser 226 is provided between the second distillation plate 220 and the third distillation plate 223. The third liquid accumulation plate 224 is located below the third condenser 226. A purification pipe 225 is provided on the third liquid accumulation plate 224. The top of the purification pipe 225 passes through the second distillation plate 220 and the first distillation plate 215 in sequence and passes through and is connected to the connecting pipe 212.

[0034] As a preferred technical solution in this embodiment, when NMP enters the purification tank 210 through the discharge pipe 207 after dehydration, it will accumulate on the first distillation plate 215, and then the staff can control the temperature of the first distillation plate 215 through the waste tank 11 to heat the NMP once, so that the NMP evaporates. The evaporated NMP will condense into liquid when it contacts the first condenser 216 and enter the first liquid accumulation tray 218, and then flow into the second distillation plate 220 through the first drain pipe 217. Then the staff can control the second distillation plate 220 to heat the NMP for a second time. The NMP is heated to evaporate again. After the second evaporation, it will be condensed for the second time after contacting the second condenser 221. The condensed NMP will flow into the second liquid accumulation tray 219 and then flow into the third distillation plate 223 through the second drain pipe 222. Finally, it will be heated for the last time on the third distillation plate 223. The heated NMP will be condensed for the third time after encountering the third condenser 226. The NMP after the third condensation will enter the third liquid accumulation plate 224, and then enter the first resin tower 31 through the connecting pipe 213 under the action of the third suction pump 2131 for the final purification and filtration.

[0035] In order to achieve a good filtering effect, the filter tank 33 in this embodiment is provided with a first filter 331, a second filter 332 and a third filter 333. In actual use, the first filter 331 can filter one micron, the second filter 332 can filter 0.5 microns, and the third filter 333 can filter 0.2 micron filters, thereby achieving the final filtering and impurity removal effect on NMP, further ensuring its purity.

[0036] The working principle of the above embodiment is:

[0037] 1. The staff can first pass NMP waste liquid into the deslagging tank 201, and then control the heater 204 to heat the waste liquid under negative pressure in the deslagging tank 201. The volatile components in the NMP raw material are vaporized and enter the dehydration tank 206 in gaseous form. The non-volatile components in the NMP raw material enter the waste tank 11 through the slag discharge pipe 202. After the deslagging in the deslagging tank 201, the material enters the dehydration tank 206 in the form of gaseous feed. The staff can control the heater 204 to heat the inside thereof, so that the internal temperature is lower than the boiling point of NMP and higher than the boiling point of water, so that the water or other impurities below the NMP cost point will enter the waste tank 11 through the drain pipe 209, and the effect of dehydrating NMP is achieved. The dehydrated NMP waste liquid enters the purification tank 210 through the discharge pipe 207 under the action of the second suction pump 208 to achieve further purification.

[0038] 2. After being dehydrated, NMP enters the purification tank 210 through the discharge pipe 207, and the NMP will accumulate on the first distillation plate 215. Then, the staff can control the temperature of the first distillation plate 215 through the waste tank 11 to heat the NMP once, so that the NMP evaporates. The evaporated NMP will condense into liquid when it contacts the first condenser 216 and enter the first liquid accumulation tray 218, and then flow into the second distillation plate 220 through the first liquid discharge pipe 217. Then, the staff can control the second distillation plate 220 to heat the NMP again. Evaporation, the NMP after the second evaporation will be condensed for the second time after contacting the second condenser 221, the condensed NMP will flow into the second liquid accumulation tray 219 and then flow into the third distillation plate 223 through the second drain pipe 222, and finally be heated for the last time on the third distillation plate 223, the heated NMP will be condensed for the third time after encountering the third condenser 226, the NMP after the third condensation will enter the third liquid accumulation plate 224, and then enter the first resin tower 31 through the connecting pipe 213 under the action of the third suction pump 2131 for the final purification and filtration;

[0039] After being purified, the NMP will enter the first resin tower 31 through the connecting pipe 213 under the action of the first distillation plate 215, and then pass through the multi-stage resin bed in the first resin tower 31, be purified and impurity-free, and then enter the second resin tower 32 for further purification and impurity-free, and finally enter the filter tank 33 for filtration.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An industrial device for preparing electronic grade NMP using waste NMP, comprising a workbench (1), characterized in that: The workbench (1) is provided with a waste tank (11), a wastewater treatment component (2) and a filtering component (3); The wastewater treatment component (2) is provided with a slag removal tank (201), a slag removal pipe (202) is provided at the bottom of the slag removal tank (201), the other end of the slag removal pipe (202) is connected to the waste material tank (11), a first suction pump (203) is provided on the slag removal pipe (202), a guide tube (205) is provided at the top of the slag removal pipe (202), the other end of the guide tube (205) is connected to a dewatering tank (206), a drainage pipe (209) is provided at the top of the dewatering tank (206), the other end of the drainage pipe (209) is connected to the waste material tank (11), and a first suction pump (203) is provided on the slag removal pipe (202). The material tank (11) is kept in communication, a discharge pipe (207) is provided at the bottom of the dehydration tank (206), the other end of the discharge pipe (207) is connected to the purification tank (210), a second suction pump (208) is provided on the discharge pipe (207), a sewage pipe (214) is provided at the bottom of the purification tank (210), the other end of the sewage pipe (214) is kept in communication with the slag discharge pipe (202), a connecting pipe (212) is provided at the top of the purification tank (210), the other end of the connecting pipe (212) is fixedly connected to a connecting pipe (213); The filtering assembly (3) is provided with a first resin tower (31), a second resin tower (32) and a filtering tank (33); an end of the connecting pipe (213) away from the purification tank (210) is connected to the first resin tower (31); a third suction pump (2131) is provided on the connecting pipe (213); filtering pipes (34) are provided between the first resin tower (31), the second resin tower (32) and the filtering tank (33); and a fourth suction pump (35) is provided on the filtering pipes (34).

2. The industrial device for preparing electronic grade NMP using waste NMP according to claim 1, characterized in that: Heaters (204) are provided at the bottoms of the slag removal tank (201) and the dehydration tank (206).

3. The industrial device for preparing electronic grade NMP using waste NMP according to claim 1, characterized in that: The purification tank (210) is provided with a control panel (211).

4. The industrial device for preparing electronic grade NMP using waste NMP according to claim 1, characterized in that: The purification tank (210) is provided with a first distillation plate (215), a second distillation plate (220), a third distillation plate (223) and a first condenser (216). The first distillation plate (215) is located below the discharge pipe (207). The first distillation plate (215) is provided with a first liquid discharge pipe (217). The top of the first liquid discharge pipe (217) is fixedly connected with a first liquid accumulation tray (218). The first liquid accumulation tray (218) is located below the first condenser (216).

5. The industrial device for preparing electronic grade NMP using waste NMP according to claim 4, characterized in that: The bottom of the first liquid drain pipe (217) passes through the first distillation plate (215) and is located above the second distillation plate (220); a second liquid accumulation tray (219) is provided on the first liquid drain pipe (217); a second condenser (221) is provided between the first distillation plate (215) and the second distillation plate (220); the second liquid accumulation tray (219) is located below the second condenser (221); a second liquid drain pipe (222) is provided on the second liquid accumulation tray (219); the other end of the second liquid drain pipe (222) passes through the second distillation plate (220); ) and is located above the third distillation plate (223), a third liquid accumulation plate (224) is arranged on the third distillation plate (223), a third condenser (226) is arranged between the second distillation plate (220) and the third distillation plate (223), the third liquid accumulation plate (224) is located below the third condenser (226), a purification tube (225) is arranged on the third liquid accumulation plate (224), and the top of the purification tube (225) passes through the second distillation plate (220) and the first distillation plate (215) in sequence and passes through and is connected to the connecting tube (212).

6. The industrial device for preparing electronic grade NMP using waste NMP according to claim 1, characterized in that: A first filter (331), a second filter (332) and a third filter (333) are arranged in the filter tank (33).

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