A device for purifying NMP organic impurities

Abstract

The application discloses a kind of purified NMP organic impurity devices, first negative pressure pump can be beneficial to the NMP medium in purification tank is inhaled to the storage tank below, can further improve purification efficiency, second heating ring can realize the heating of storage tank and purification tank, promote the evaporation of moisture in NMP medium, while ultrasonic generator not only can kill the microorganism of NMP medium etc., in addition, it is beneficial to the sustained vibration of upper plate filter and lower plate filter, promote the circulation of NMP medium, to further enhance the purification efficiency, finally semiconductor refrigerator not only can control temperature, avoid temperature to continue to rise, cause safety accident, in addition, with the conduction of conducting frame, it can be beneficial to the low temperature is introduced to the upper plate filter and lower plate filter, effectively prevent the defect that filtration pore size is expanded under the action of thermal expansion due to overheating, avoid the problem that the organic matter that can be blocked originally follows NMP medium and circulates due to pore size expansion.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical production, in particular to a device for purifying NMP organic impurities. BACKGROUND

[0002] With the industrial upgrading of China, the quality requirements of various industries on products are higher and higher, and the purity requirements of raw materials are also higher and higher. NMP (N-methyl pyrrolidone) is used as a solvent for lithium ion battery cathode slurry, accounting for 40% of the weight formula of the slurry. After the coating process, the recovered device is recycled and returned to the NMP factory for re-purification. The impurities of NMP products include organic residual products and reaction by-products, residual water, free amine, non-metallic foreign matter in the preparation process, metallic foreign matter in the preparation process and the like. These impurities directly affect the production process of lithium ion batteries and the performance of the batteries. The impurities in the NMP recovery liquid include organic residual products and reaction by-products, water, free amine, non-metallic foreign matter in the battery pole piece preparation process, metallic foreign matter in the battery pole piece preparation process, and particle dust in the battery slurry formula (such as lithium iron phosphate particles, ternary material particles and conductive agent particles). In addition to water, other impurities enter the NMP purification equipment system, which pollutes the equipment and accumulates in the equipment, affecting the quality of NMP products.

[0003] According to the above, in the current NMP purification and recovery production process, although filtration and purification are also provided, the commonly used process equipment is relatively simple, and therefore has many defects and deficiencies, which are as follows.

[0004] 1. The water molecules in NMP cannot be further removed in the filtration and purification process, which affects the purity effect of NMP.

[0005] 2. The traditional gravity type filter is a passive type of medium passing through the filter, so the efficiency is low, and local blockage is easy to occur, which is not conducive to efficient purification.

[0006] 3. The impurities after filtration are easy to accumulate in the equipment, which is difficult to clean and easy to block, and in addition, it is not convenient to detect, and the staff cannot grasp it in time.

[0007] Therefore, in view of the above defects, it is necessary to design a device for purifying NMP organic impurities. SUMMARY

[0008] The technical problem to be solved by the application is to provide a device for purifying NMP organic impurities to solve the problems in the background art.

[0009] In order to solve the above technical problems, the technical scheme of the present application is: a device for purifying NMP organic impurities, comprising a storage tank, a negative pressure pump, a heating ring, a purification tank, an upper plate filter, a lower plate filter, a conducting frame, a semiconductor refrigerator, an ultrasonic generator, a cover, and a dehumidifier, the negative pressure pump is fixedly arranged at the middle end of the top of the storage tank, the negative pressure pump is connected with the storage tank by welding, the heating ring is fixedly arranged on the outer side of the top of the storage tank, the heating ring is connected with the storage tank by bolts, the purification tank is fixedly arranged on the top of the negative pressure pump, the purification tank is connected with the negative pressure pump by welding, and the purification tank is connected with the heating ring by bolts, the upper plate filter is fixedly arranged at the upper end inside the purification tank, the upper plate filter is connected with the purification tank by welding, the lower plate filter is fixedly arranged at the lower end inside the purification tank, the lower plate filter is connected with the purification tank by welding, the conducting frame is fixedly arranged between the upper plate filter and the lower plate filter, the conducting frame is connected with the upper plate filter and the lower plate filter by welding, the semiconductor refrigerator is fixedly arranged on the right side of the purification tank, the semiconductor refrigerator is connected with the purification tank by welding, and the semiconductor refrigerator is connected with the conducting frame by welding, the ultrasonic generator is fixedly arranged on the left side of the purification tank, the ultrasonic generator is connected with the purification tank by welding, and the ultrasonic generator is connected with the conducting frame by welding, the cover is fixedly arranged on the top of the purification tank, the cover is connected with the purification tank by bolts, and the dehumidifier is fixedly arranged on the right side of the top of the cover, and the dehumidifier is connected with the cover by welding.

[0010] Further, the storage tank is further provided with a discharge valve at the lower end of the right side inside the storage tank, and the discharge valve is connected with the storage tank by welding.

[0011] Further, the purification tank is further provided with a protective cover on the outer side of the purification tank, and the protective cover is connected with the purification tank by welding.

[0012] Further, the purification tank and the protective cover are further provided with a first cleaning valve at the upper end of the left side inside the purification tank and the protective cover, and the first cleaning valve is connected with the purification tank and the protective cover by welding, and the purification tank and the protective cover are further provided with a second cleaning valve at the lower end of the left side inside the purification tank and the protective cover, and the second cleaning valve is connected with the purification tank and the protective cover by welding.

[0013] Further, the filter pore size of the upper plate filter is larger than the filter pore size of the lower plate filter, and the filter pore size of the lower plate filter is smaller than the diameter of the organic impurities in NMP.

[0014] Further, the cover is further provided with a flow guide valve at the left side inside the cover, and the flow guide valve is connected with the cover by welding.

[0015] Compared with the prior art, the device for purifying NMP organic impurities has the following advantages:

[0016] 1. The negative pressure pump in this invention can facilitate the suction of NMP media from the purification tank to the storage tank below. With the strong suction of the negative pressure pump, the purification efficiency can be further improved.

[0017] 2. The heating ring in this invention can be used to heat the storage tank and purification tank, promote the evaporation of moisture in the NMP medium, and improve the dehumidification and purification effect of the NMP medium.

[0018] 3. Through the ultrasonic generator in this invention, not only can bacteria and microorganisms in the NMP medium be killed, but also the upper and lower plate filters will continuously vibrate during the NMP medium filtration and purification process, promoting the flow of the NMP medium and allowing it to pass through more quickly, thereby enhancing the purification efficiency.

[0019] 4. Through the semiconductor cooler in this invention, not only can the temperature be controlled to avoid a continuous rise in temperature caused by heating, thus preventing safety accidents, but also, with the help of the conduction frame, the low temperature can be quickly introduced to the upper plate filter and the lower plate filter. This effectively prevents the filter pores of the upper plate filter and the lower plate filter from expanding due to thermal expansion caused by overheating, and avoids the problem that organic substances that could have been blocked from flowing along with the NMP medium due to the expansion of the pore size. Attached Figure Description

[0020] Figure 1 This is a front view of an apparatus for purifying organic impurities in NMP.

[0021] Figure 2 This is a top view of an apparatus for purifying organic impurities in NMP.

[0022] Figure 3 A cross-sectional view along line A of an apparatus for purifying organic impurities in NMP;

[0023] Figure 4 A three-dimensional device for purifying NMP organic impurities Figure 1 ;

[0024] Figure 5 A three-dimensional device for purifying NMP organic impurities Figure 2 .

[0025] Storage tank 1, negative pressure pump 2, heating ring 3, purification tank 4, upper plate filter 5, lower plate filter 6, conduction frame 7, semiconductor cooler 8, ultrasonic generator 9, cover 10, dehumidifier 11, discharge valve 101, protective cover 401, first cleaning valve 402, second cleaning valve 403, diversion valve 1001.

[0026] The following detailed embodiments will be further explained in conjunction with the above-mentioned accompanying drawings. Detailed Implementation

[0027] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the concepts underlying the described embodiments. However, it will be apparent to those skilled in the art that the described embodiments can be practiced without some or all of these specific details, in other instances, well known process steps have not been described in detail in order not to unnecessarily obscure aspects of the described embodiments.

[0028] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 A kind of purified NMP organic impurity device, including storage tank 1, negative pressure pump 2, heating ring 3, purification tank 4, upper plate filter 5, lower plate filter 6, conducting frame 7, semiconductor refrigerator 8, ultrasonic generator 9, cover 10, dehumidifier 11, discharge valve 101, protective cover 401, first cleaning valve 402, second cleaning valve 403, flow valve 1001;

[0029] In one embodiment, the negative pressure pump 2 at the top of the storage tank 1 can continuously generate negative pressure suction after starting, facilitate the NMP medium in the top purification tank 4 to be sucked into the inside of the lower storage tank 1, by the superstrong suction of the negative pressure pump 2, can further improve the purification efficiency, facilitate the NMP medium to quickly penetrate the upper plate filter 5 and the lower plate filter 6;

[0030] In one embodiment, the heating ring 3 is located between the storage tank 1 and the purification tank 4, by the action of the heating ring 3, the heating of the storage tank 1 and the purification tank 4 can be realized, promote the evaporation of moisture in the NMP medium, improve the dehumidification purification effect of NMP medium;

[0031] In one embodiment, because the filter aperture of the upper plate filter 5 is greater than the filter aperture of the lower plate filter 6, and the filter aperture of the lower plate filter 6 is smaller than the diameter of the organic impurities in NMP, therefore the two-stage filtering effect is realized, and step-by-step filtering is realized;

[0032] In one embodiment, the conducting frame 7 is located between the upper plate filter 5 and the lower plate filter 6, and is connected with the ultrasonic generator 9, can uniformly and quickly conduct the ultrasonic wave to the region between the upper plate filter 5 and the lower plate filter 6 after the ultrasonic generator 9 is started, by the high-speed oscillation effect generated by the ultrasonic wave, not only can kill the bacteria, microorganisms and the like of the NMP medium, in addition, also facilitate the upper plate filter 5 and the lower plate filter 6 to continue to vibrate while the NMP medium is filtered and purified, promote the circulation of the NMP medium, make it pass through more quickly, and further enhance the purification efficiency;

[0033] In one embodiment, the semiconductor refrigerator 8 is connected with the conduction frame 7, and can suck heat and lower the temperature of the area between the upper plate filter 5 and the lower plate filter 6 through the conduction frame 7, so as to not only control the temperature and avoid continuous temperature rise caused by heating and safety accidents, but also facilitate the rapid introduction of low temperature to the upper plate filter 5 and the lower plate filter 6 through the conduction of the conduction frame 7, effectively prevent the problem of expansion of the filter pore size of the upper plate filter 5 and the lower plate filter 6 under the action of thermal expansion caused by overheating, avoid the problem of the organic matter that can be blocked flowing together with the NMP medium due to the expansion of the pore size, and the protective cover 401 can also cover and protect the semiconductor refrigerator 8 to avoid external impact.

[0034] In one embodiment, the cover 10 is located at the top of the purification tank 4, and the water vapor can contact the dehumidifier 11 on the cover 10 upward, and the dehumidifier 11 can effectively dehumidify by absorbing water, thereby improving the drying effect of the purification tank 4.

[0035] Specifically, the unpurified NMP medium enters the purification tank 4 through the flow valve 1001, and under the mutual action of gravity and negative pressure suction of the negative pressure pump 2, the NMP medium passes through the upper plate filter 5 and the lower plate filter 6 in turn to realize the purification of the organic matter, and in the process, the heating ring 3 removes the water in the NMP medium, the semiconductor refrigerator 8 controls the heat to avoid the expansion of the filter pore size of the upper plate filter 5 and the lower plate filter 6, enhances the stability of the filter, the ultrasonic generator 9 promotes the filtering effect and kills microorganisms, and further improves the filtering effect, and finally the purified NMP medium flows into the storage tank 1, and when it is needed to be used, it can be naturally discharged by opening the discharge valve 101. After one cycle of purification operation, in order to avoid the problem of organic matter blockage caused by long-term purification, the first cleaning valve 402 and the second cleaning valve 403 can also be opened to supply the cleaning liquid into the purification tank 4, so as to realize the flushing of the upper plate filter 5 and the lower plate filter 6, and achieve the purpose of removing the organic matter.

[0036] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A device for purifying NMP organic impurities, characterized by It comprises a storage tank, a negative pressure pump, a heating ring, a purification tank, an upper plate filter, a lower plate filter, a conducting frame, a semiconductor refrigerator, an ultrasonic generator, a cover, and a dehumidifier. The negative pressure pump is fixedly arranged at the middle end of the top of the storage tank and is connected with the storage tank by welding. The heating ring is fixedly arranged at the outer side of the top of the storage tank and is connected with the storage tank by bolting. The purification tank is fixedly arranged at the top of the negative pressure pump and is connected with the negative pressure pump by welding and with the heating ring by bolting. The upper plate filter is fixedly arranged at the upper end inside the purification tank and is connected with the purification tank by welding. The lower plate filter is fixedly arranged at the lower end inside the purification tank and is connected with the purification tank by welding. The conducting frame is fixedly arranged between the upper plate filter and the lower plate filter and is connected with the upper plate filter and the lower plate filter by welding. The semiconductor refrigerator is fixedly arranged at the right side of the purification tank and is connected with the purification tank by welding and with the conducting frame by welding. The ultrasonic generator is fixedly arranged at the left side of the purification tank and is connected with the purification tank by welding and with the conducting frame by welding. The cover is fixedly arranged at the top of the purification tank and is connected with the purification tank by bolting. The dehumidifier is fixedly arranged at the right side of the top of the cover and is connected with the cover by welding. The negative pressure pump is beneficial to sucking the NMP medium in the purification tank into the storage tank below, and the super strong suction of the negative pressure pump can further improve the purification efficiency. The heating ring can heat the storage tank and the purification tank, promote the evaporation of water in the NMP medium, and improve the dehumidification and purification effect of the NMP medium. The ultrasonic generator uniformly and rapidly conducts ultrasonic waves to the area between the upper plate filter and the lower plate filter, and the high-speed oscillation generated by the ultrasonic waves can not only kill bacteria and microorganisms in the NMP medium, but also help the upper plate filter and the lower plate filter to continuously vibrate during the filtration and purification of the NMP medium, promote the circulation of the NMP medium, make it pass through more quickly, and thus enhance the purification efficiency. The semiconductor refrigerator can absorb heat and cool the area between the upper plate filter and the lower plate filter through the conducting frame, which can not only control the temperature to avoid continuous temperature rise caused by heating and cause safety accidents, but also can quickly introduce low temperature to the upper plate filter and the lower plate filter through the conducting frame, effectively prevent the problem that the filter pore size of the upper plate filter and the lower plate filter expands under the action of thermal expansion due to overheating, and avoid the problem that the organic substances that can be blocked follow the NMP medium due to the expansion of the pore size. The moisture vapor can contact the dehumidifier on the cover, and the dehumidifier can effectively dehumidify the moisture and thus improve the drying effect of the purification tank.

2. The apparatus for purifying NMP organic impurities of claim 1, wherein The storage tank further penetrates a discharge valve at the lower end of the right side inside the storage tank, and the discharge valve is connected with the storage tank by welding.

3. The apparatus for purifying NMP organic impurities of claim 1, wherein The purification tank further fixedly arranges a protective cover outside, and the protective cover is connected with the purification tank by welding.

4. The apparatus for purifying NMP organic impurities of claim 3, wherein The first cleaning valve is welded to the purification tank and the protective cover, and the second cleaning valve is also welded to the left lower end of the interior of the purification tank and the protective cover.

5. The apparatus for purifying NMP organic impurities of claim 1, wherein The filter aperture of the upper plate filter is larger than that of the lower plate filter, and the filter aperture of the lower plate filter is smaller than the diameter of the organic impurities in the NMP.

6. The apparatus for purifying NMP organic impurities of claim 1, wherein The flow guide valve is fixed to the left side of the interior of the cover and is welded to the cover.

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