CN113788776A - Lithium ion battery coating procedure NMP purification method and system - Google Patents
Lithium ion battery coating procedure NMP purification method and system Download PDFInfo
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- CN113788776A CN113788776A CN202111035561.1A CN202111035561A CN113788776A CN 113788776 A CN113788776 A CN 113788776A CN 202111035561 A CN202111035561 A CN 202111035561A CN 113788776 A CN113788776 A CN 113788776A
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- 238000000576 coating method Methods 0.000 title claims abstract description 79
- 239000011248 coating agent Substances 0.000 title claims abstract description 70
- 238000000746 purification Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 37
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 96
- 238000000926 separation method Methods 0.000 claims abstract description 69
- 238000003860 storage Methods 0.000 claims abstract description 24
- 239000012535 impurity Substances 0.000 claims abstract description 23
- 238000011084 recovery Methods 0.000 claims abstract description 20
- 238000009833 condensation Methods 0.000 claims abstract description 16
- 230000005494 condensation Effects 0.000 claims abstract description 16
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 120
- 239000012528 membrane Substances 0.000 claims description 41
- 238000009835 boiling Methods 0.000 claims description 26
- 239000002912 waste gas Substances 0.000 claims description 23
- 238000004064 recycling Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 7
- 230000003139 buffering effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 210000001503 joint Anatomy 0.000 abstract description 9
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 158
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229910021536 Zeolite Inorganic materials 0.000 description 5
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 239000012466 permeate Substances 0.000 description 5
- 239000010457 zeolite Substances 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
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- 239000012855 volatile organic compound Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- 239000000575 pesticide Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000000341 volatile oil Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D207/18—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member
- C07D207/22—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D207/24—Oxygen or sulfur atoms
- C07D207/26—2-Pyrrolidones
- C07D207/263—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms
- C07D207/267—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to the ring nitrogen atom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/225—Multiple stage diffusion
- B01D53/226—Multiple stage diffusion in serial connexion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a method and a system for purifying NMP in a coating procedure of a lithium ion battery, belonging to the field of NMP purification, wherein the method for purifying the NMP comprises the following steps: s1: primary condensation, S2: gas compression, S3: separation of NMP, S4: collection of NMP, S5: separating out high-boiling-point impurities, S6: obtaining NMP pure liquid. This NMP purification system includes precooling surface cooler, first NMP liquid storage tank, compressor, separation element, pressure buffer subassembly, negative pressure flash tank, vacuum pump, vacuum condenser and NMP pure liquid jar, precooling surface cooler connects compressor and first NMP liquid storage tank, separation element is connected to the compressor, separation element connects pressure buffer subassembly, pressure buffer subassembly connects the negative pressure flash tank, the vacuum pump is connected to the negative pressure flash tank, vacuum condenser connects between vacuum pump and negative pressure flash tank. The invention can simplify the system structure, is convenient for recovery and purification, is further convenient for butt joint with production, effectively recycles NMP and reduces the cost.
Description
Technical Field
The invention relates to the technical field of NMP recovery and purification, in particular to a method and a system for purifying NMP in a coating process of a lithium ion battery.
Background
N-methylpyrrolidone (NMP), also known as 1-methyl-2-pyrrolidone or N-methyl-2-pyrrolidone, is a colorless transparent oily liquid with a slight amine odor; the volatility is low, the thermal stability and the chemical stability are both good, and the volatile oil can be volatilized along with water vapor; it is hygroscopic; is sensitive to light; it is easily soluble in water, ethanol, diethyl ether, acetone, ethyl acetate, chloroform and benzene, and can dissolve most organic and inorganic compounds, polar gas, natural and synthetic high molecular compounds. N-methyl pyrrolidone is widely applied to the industries of lithium batteries, medicines, pesticides, pigments, cleaning agents, insulating materials and the like.
In the manufacture of lithium battery, the positive electrode material is fully stirred with NMP to make slurry, the slurry is uniformly coated on the copper foil by using a coater, and the NMP is rapidly evaporated by using high temperature (between 90 ℃ and 140 ℃), so that the energy consumption of the coating process is high. NMP has the characteristics of flammability and toxicity, cannot be directly discharged, has higher recovery value, and is generated for ensuring the use safety and reducing the enterprise cost and applying a NMP purification system.
The prior system recovers NMP in mixed gas discharged by a drying pole piece of a coating machine drying oven in three steps:
primarily cooling the air exhausted by the coating oven through gas-gas heat exchange: exhaust gas (the temperature is about 100 ℃ generally) of the coating machine passes through a waste heat recovery device, and heat exchange is carried out between the air recycled (the temperature is about 20 ℃) condensed by an NMP system and the exhaust gas of the coating machine, so that the exhaust gas of the coating machine is primarily cooled (about 70 ℃), and the cooled gas enters a turning wheel recovery device for next treatment; meanwhile, the air which flows back after being processed by the first and second surface air coolers and enters the coating machine is preheated and recycled by a preheating and recycling device, and is sent into the coating machine after being heated (about 65 ℃) by utilizing high-temperature exhaust air of a coating oven. The return air temperature of the coating oven is heated while the exhaust air temperature is reduced, so that the purposes of waste heat recovery and energy conservation are achieved;
surface air cooler condensation: after the heat exchange treatment of the exhausted air of the coating machine, the temperature is reduced to about 20 ℃ through a primary surface air cooler and a secondary surface air cooler (circulating chilled water for a refrigerant), a large amount of NMP is separated out, and the content of the NMP in the treated air is about 300 ppm. 90% of the air flows back to the coating machine oven through the waste heat recovery device, the fan and the electric heater.
And (3) rotary wheel adsorption concentration: for the remaining 10% of gas, in order to further recover the NMP in the mixed gas and make it reach the emission standard, the NMP in the cooled mixed air is adsorbed and concentrated by a VOC (volatile organic compound) zeolite rotating wheel, and the NMP in the concentrated mixed air is refluxed to the front end of the surface cooler to be condensed and precipitated.
Through the steps, the NMP recovery rate can reach more than 98%, the NMP content exhausted after the rotary wheel recovery treatment meets the environmental protection requirement, and the NMP is exhausted through an exhaust system.
The prior art has the following problems: the structure is complicated and inconvenient to butt joint with the production, and can not be effectively recycled, and the cost is increased. Therefore, the technical personnel in the field provide a NMP recovery device in the coating process of the lithium ion battery to solve the problems in the background technology.
Disclosure of Invention
The invention aims to provide a method and a system for purifying NMP in a coating procedure of a lithium ion battery, which can simplify the structure of the system, facilitate recovery and purification, further facilitate butt joint with production, effectively recycle the NMP, and reduce the cost so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a lithium ion battery coating procedure NMP purification method comprises the following steps:
s1: performing primary condensation, namely condensing the high-temperature waste gas containing NMP through a precooling surface cooler, condensing a small amount of NMP liquid and conveying the small amount of NMP liquid to a first NMP liquid storage tank;
s2: gas compression, namely compressing the waste gas after primary condensation by a compressor;
s3: separating NMP, namely separating NMP-containing gas from the waste gas compressed by the compressor through a separation component;
s4: collecting NMP, namely conveying the NMP-containing gas to a pressure buffer assembly;
s5: separating high boiling point impurities, namely conveying NMP gas and NMP liquid in the pressure buffer assembly to a negative pressure flash tank, and separating the high boiling point impurities and gaseous NMP through liquid state;
s6: and (3) obtaining NMP pure liquid, conveying gaseous NMP to a vacuum condenser for condensation under the pumping action of a vacuum pump, separating out the NMP pure liquid and discharging the NMP pure liquid to an NMP pure liquid tank.
The invention can simplify the system structure, is convenient for recovery and purification, is further convenient for butt joint with production, effectively recycles NMP and reduces the cost.
As a further scheme of the invention: in S3, the separation module includes a first separation membrane module and a second separation membrane module, and the specific separation process of NMP is as follows: the waste gas compressed by the compressor is led into a first separation membrane component to separate first permeation gas and first permeation residual gas, then the first permeation residual gas is led into a second separation membrane component to separate second permeation gas and second permeation residual gas, and finally the first permeation gas and the second permeation gas containing NMP are conveyed to a pressure buffering component.
The first separation membrane component and the second separation membrane component both adopt organic gas separation membranes, and the organic gas separation membranes can separate NMP from air and water vapor.
As a still further scheme of the invention: the second residual gas is divided into two paths, one path of the second residual gas accounts for 90% of the total gas and is recycled through the recycling assembly, and the other path of the second residual gas accounts for 10% of the total gas and is discharged to the external environment through the discharge port.
This setting can carry out recycle with most second infiltration residual gas.
As a still further scheme of the invention: the specific process of recycling the recycling assembly comprises the following steps: and conveying the recycled second residual gas to an electric heater through a circulating fan of the coating oven, heating the second residual gas by the electric heater, conveying the heated second residual gas to the coating oven to produce high-temperature waste gas containing NMP, and conveying the high-temperature waste gas containing NMP to a pre-cooling surface cooler through an exhaust fan of the coating oven to form circulation.
This setting can be used again most second residual air that oozes, and then forms the inner loop.
As a still further scheme of the invention: in S4, the pressure buffer assembly includes a first pressure buffer tank and a second pressure buffer tank, and the specific NMP collecting process is as follows: carry the gas that contains NMP to first pressure buffer tank, when first pressure buffer tank reached the settlement pressure, the gas that contains NMP switches through first valve group and carries second pressure buffer tank, and the NMP gas that gets into first pressure buffer tank simultaneously separates out liquid NMP under the pressure effect, and liquid NMP discharges the second NMP liquid storage tank in the first pressure buffer tank, and gaseous NMP enters into the negative pressure flash tank, and NMP liquid enters into the negative pressure flash tank through going out the liquid pump in the second NMP liquid storage tank.
The first valve group is arranged between the pressure buffer component and the separating component, and can convey NMP to different pressure buffer tanks according to requirements.
As a still further scheme of the invention: in the S5, the specific separation process of the high-boiling impurities is as follows: liquid NMP in the negative pressure flash tank is heated and circulated by a circulating pump and a heat exchanger, low boiling point NMP is changed into gas state, high boiling point impurities are gradually enriched in liquid state and discharged to a high boiling point impurity liquid tank through a second valve group, and the gas state NMP is conveyed to a vacuum condenser through a vacuum pump.
This setting is different according to the boiling point of NMP and impurity, effectively separates out high boiling point impurity through the liquid.
As a still further scheme of the invention: in the step S6, after the gaseous NMP in the negative pressure flash tank is condensed by the vacuum condenser, the remaining gas is sent to the inlet of the second separation membrane module through the outlet of the vacuum pump, and is mixed with the air after the precooling surface cooler and then enters the second separation membrane module.
This setting is convenient for carry out effectual recovery purification again with noncondensable gas, and then improves the purification effect.
A lithium ion battery coating procedure NMP purification system comprises a precooling surface cooler, a first NMP liquid storage tank, a compressor, a separation assembly, a pressure buffer assembly, a negative pressure flash tank, a vacuum pump, a vacuum condenser and an NMP pure liquid tank;
the precooling surface cooler is connected with the compressor and the first NMP liquid storage tank;
the compressor is connected with the separation assembly;
the separation assembly is connected with the pressure buffering assembly;
the pressure buffer assembly is connected with a negative pressure flash tank;
the negative pressure flash tank is connected with a vacuum pump;
the vacuum condenser is connected between the vacuum pump and the negative pressure flash tank;
the NMP pure liquid tank is connected with a vacuum condenser.
Compared with the existing purification system, the NMP purification system not only simplifies the structure, but also can be effectively in butt joint production and recycled.
As a still further scheme of the invention: the recovery assembly comprises a coating oven circulating fan, an electric heater, a coating oven and a coating oven exhaust fan;
the coating oven circulating fan is connected with the separation assembly;
the electric heater is connected with a circulating fan of the coating oven;
the coating oven is connected with the electric heater;
the coating oven exhaust fan is connected with the coating oven.
As a still further scheme of the invention: the device is characterized by further comprising a circulating pump and a heat exchanger, wherein the circulating pump is connected with the negative-pressure flash tank, the heat exchanger is connected with the negative-pressure flash tank, and a second valve group is connected between the heat exchanger and the circulating pump.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize the online recovery and purification of NMP in the coating process and seamless butt joint with production. In the traditional purification process, the recovered NMP waste liquid needs to be sent to an external professional factory for treatment, and on-site production cannot be realized.
The system adopts the gas separation membrane component to realize the separation of NMP and air under the gas state (about 80 ℃), and reduces the energy consumption of condensation cooling (less than 20 ℃) and zeolite rotating wheel desorption regeneration compared with the prior commonly used NMP-coated condensation and zeolite adsorption treatment process.
Compared with the traditional distillation and rectification purification process, the invention can obviously reduce the energy consumption level in the aspect of purification.
By the system, cyclic utilization of NMP in a factory can be realized, and only a small amount of NMP new liquid needs to be supplemented; the NMP raw material purchasing cost is reduced fundamentally.
After the gas discharged from the coating machine is subjected to membrane treatment by the system, most of the gas is circulated back to the coating machine for repeated recycling, so that the cleanliness of the gas is ensured, the consistency of the product quality in the coating oven is ensured, and only a small amount of gas is discharged up to the standard.
Drawings
FIG. 1 is a flow chart of a lithium ion battery coating process NMP purification method;
fig. 2 is a schematic structural diagram of a lithium ion battery coating procedure NMP purification system.
In the figure: 1. coating an oven; 2. a coating oven exhaust fan; 3. precooling the surface cooler; 4. a compressor; 5. a first NMP liquid storage tank; 6. a first separation membrane module; 7. a second separation membrane module; 8. an outer discharge port; 9. a first valve group; 10. a first pressure surge tank; 11. a second pressure surge tank; 12. a second NMP liquid storage tank; 13. a liquid outlet pump; 14. a negative pressure flash tank; 15. a heat exchanger; 16. a circulation pump; 17. a high boiling point impurity liquid tank; 18. a vacuum condenser; 19. a vacuum pump; 20. a NMP pure liquid tank; 21. a circulating fan of the coating oven; 22. an electric heater; 23. a second valve set.
Detailed Description
The present invention will be further illustrated by the following specific examples, which are carried out on the premise of the technical scheme of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a method for purifying NMP in a coating process of a lithium ion battery includes the following steps:
s1: performing primary condensation, namely condensing the high-temperature waste gas containing NMP through a precooling surface cooler 3, condensing a small amount of NMP liquid and conveying the small amount of NMP liquid to a first NMP liquid storage tank 5;
s2: gas compression, namely compressing the waste gas after primary condensation by a compressor 4;
s3: separating NMP, namely separating NMP-containing gas from the waste gas compressed by the compressor 4 through a separation component;
s4: collecting NMP, namely conveying the NMP-containing gas to a pressure buffer assembly;
s5: separating out high boiling point impurities, namely conveying the NMP gas and the NMP liquid in the pressure buffer assembly to a negative pressure flash tank 14, and separating out the high boiling point impurities and gaseous NMP through liquid state;
s6: and (3) obtaining NMP pure liquid, conveying gaseous NMP to a vacuum condenser 18 for condensation under the pumping action of a vacuum pump 19, separating out the NMP pure liquid and discharging the NMP pure liquid to a NMP pure liquid tank 20.
The invention can simplify the system structure, is convenient for recovery and purification, is further convenient for butt joint with production, effectively recycles NMP and reduces the cost.
In this embodiment: in S3, the separation module includes a first separation membrane module 6 and a second separation membrane module 7, and the specific separation process of NMP is as follows: the waste gas compressed by the compressor 4 is led into the first separation membrane component 6 to separate first permeation gas and first permeation residual gas, then the first permeation residual gas is led into the second separation membrane component 7 to separate second permeation gas and second permeation residual gas, and finally the first permeation gas and the second permeation gas containing NMP are conveyed to the pressure buffer component. The first separation membrane assembly 6 and the second separation membrane assembly 7 both adopt organic gas separation membranes, and the organic gas separation membranes can separate NMP from air and water vapor.
In this embodiment: the second residual gas that oozes is divided into two routes, and one way accounts for 90% of total gas, recycles through retrieving the subassembly again, and another way accounts for 10% of total gas, discharges in the external environment through outer row mouth 8. This setting can carry out recycle with most second infiltration residual gas.
In this embodiment: the specific process of recycling the recycling assembly comprises the following steps: and conveying the recycled second residual gas to an electric heater 22 through a coating oven circulating fan 21, heating the second residual gas by the electric heater 22, conveying the heated second residual gas to a coating oven 1 to produce high-temperature waste gas containing NMP, and conveying the high-temperature waste gas containing NMP to a pre-cooling surface cooler 3 through a coating oven exhaust fan 2 to form circulation. This setting can be used again most second residual air that oozes, and then forms the inner loop.
In this embodiment: in S4, the pressure buffer assembly includes a first pressure buffer tank 10 and a second pressure buffer tank 11, and the specific NMP collecting process is as follows: the method comprises the steps that NMP-containing gas is conveyed to a first pressure buffer tank 10, when the first pressure buffer tank 10 reaches set pressure, the NMP-containing gas is conveyed to a second pressure buffer tank 11 through switching of a first valve group 9, meanwhile, liquid NMP is separated out from the NMP gas entering the first pressure buffer tank 10 under the action of pressure, the liquid NMP in the first pressure buffer tank 10 is discharged to a second NMP liquid storage tank 12, gaseous NMP enters a negative pressure flash tank 14, and NMP liquid in the second NMP liquid storage tank 12 enters the negative pressure flash tank 14 through a liquid outlet pump 13. The first valve group 9 is arranged between the pressure buffer assembly and the separating assembly, and can convey NMP to different pressure buffer tanks according to requirements.
In this embodiment: in the S5, the specific separation process of the high-boiling impurities is as follows: liquid NMP in the negative pressure flash tank 14 is heated and circulated by a circulating pump 16 and a heat exchanger 15, low boiling point NMP is changed into gas state, high boiling point impurities are gradually enriched in liquid state and are discharged to a high boiling point impurity liquid tank 17 through a second valve group 23, and the gas NMP is conveyed to a vacuum condenser 18 through a vacuum pump 19. This setting is different according to the boiling point of NMP and impurity, effectively separates out high boiling point impurity through the liquid.
In this embodiment: in S6, after the gaseous NMP in the negative-pressure flash tank 14 is condensed by the vacuum condenser 18, the remaining gas is sent to the inlet of the second separation membrane module 7 through the outlet of the vacuum pump 19, and is mixed with the precooled surface-cooler air and then enters the second separation membrane module 7. This setting is convenient for carry out effectual recovery purification again with noncondensable gas, and then improves the purification effect.
As shown in fig. 2, a system for purifying NMP in a coating process of a lithium ion battery includes a precooling surface cooler 3, a first NMP liquid storage tank 5, a compressor 4, a separation assembly, a pressure buffer assembly, a negative pressure flash tank 14, a vacuum pump 19, a vacuum condenser 18 and an NMP pure liquid tank 20;
the precooling surface cooler 3 is connected with a compressor 4 and a first NMP liquid storage tank 5;
the compressor 4 is connected with a separation component;
the separation assembly is connected with the pressure buffering assembly;
the pressure buffer assembly is connected with a negative pressure flash tank 14;
the negative pressure flash tank 14 is connected with a vacuum pump 19;
the vacuum condenser 18 is connected between a vacuum pump 19 and the negative pressure flash tank 14;
the NMP purified water tank 20 is connected to a vacuum condenser 18.
Compared with the existing purification system, the NMP purification system not only simplifies the structure, but also can be effectively in butt joint production and recycled.
In this embodiment: the separation assembly comprises a first separation membrane assembly 6 and a second separation membrane assembly 7, wherein the first separation membrane assembly 6 is connected with the compressor 4, and the second separation membrane assembly 7 is connected with the first separation membrane assembly 6.
In this embodiment: the pressure buffer assembly comprises a first pressure buffer tank 10 and a second pressure buffer tank 11, wherein the first pressure buffer tank 10 and the second pressure buffer tank 11 are both connected with the pressure buffer assembly, a first valve group 9 is arranged between the pressure buffer assembly and the separating assembly, NMP can be conveyed to different pressure buffer tanks according to needs, in addition, the first pressure buffer tank 10 is connected with a second NMP liquid storage tank 12, and the second NMP liquid storage tank 12 is connected with a liquid outlet pump 13.
In this embodiment: the recovery assembly comprises a coating oven circulating fan 21, an electric heater 22, a coating oven 1 and a coating oven exhaust fan 2;
the coating oven circulating fan 21 is connected with the separating assembly;
the electric heater 22 is connected with a coating oven circulating fan 21;
the coating oven 1 is connected with an electric heater 22;
the coating oven exhaust fan 2 is connected with the coating oven 1.
In this embodiment: the NMP purification system further comprises a circulating pump 16 and a heat exchanger 15, wherein the circulating pump 16 is connected with the negative pressure flash tank 14, the heat exchanger 15 is connected with the negative pressure flash tank 14, and a second valve group 23 is connected between the heat exchanger 15 and the circulating pump 16.
The working principle is as follows: firstly, the coating oven 1 generates high-temperature waste gas containing NMP, and then the waste gas is conveyed to a precooling surface cooler 3 through a coating oven exhaust fan 2 for condensation, and the condensed NMP is conveyed to a first NMP liquid storage tank 5. Then, the waste gas after passing through the precooling surface cooler 3 passes through a first separation membrane module 6 to separate a first permeation gas and a first residual gas. And then the first residual gas passes through a second separation membrane component 7 to separate a second permeate gas and a second residual gas.
Wherein, the second surplus gas is divided into two paths, one path of gas accounts for 90 percent of the total gas and is recycled through the recycling component, and the other path of gas accounts for 10 percent of the total gas and is discharged to the external environment through the external discharge port 8. The specific process of recycling the recycling component comprises the following steps: and conveying the recycled second residual gas to an electric heater 22 through a coating oven circulating fan 21, heating the second residual gas by the electric heater 22, conveying the heated second residual gas to a coating oven 1 to produce high-temperature waste gas containing NMP, and conveying the high-temperature waste gas containing NMP to a pre-cooling surface cooler 3 through a coating oven exhaust fan 2 to form circulation.
Meanwhile, the first permeate gas and the second permeate gas are conveyed to the first pressure buffer tank 10, when the first pressure buffer tank 10 reaches a set pressure, the first permeate gas and the second permeate gas are switched and conveyed to the second pressure buffer tank 11 through the first valve group 9, meanwhile, liquid NMP is separated out from NMP gas entering the first pressure buffer tank 10 under the action of pressure, the liquid NMP in the first pressure buffer tank 10 is discharged to the second NMP liquid storage tank 12, gaseous NMP enters the negative pressure flash tank 14, and NMP liquid in the second NMP liquid storage tank 12 also enters the negative pressure flash tank 14 through the liquid outlet pump 13.
Then, the liquid NMP in the negative pressure flash tank 14 is heated and circulated by a circulating pump 16 and a heat exchanger 15, the low boiling point NMP becomes gaseous, the high boiling point impurities are gradually enriched in liquid state and discharged to a high boiling point impurity liquid tank 17 through a second valve group 23, the gaseous NMP is conveyed to a vacuum condenser 18 through a vacuum pump 19, the gaseous NMP is condensed by the vacuum condenser 18 to separate out NMP pure liquid and is discharged to an NMP pure liquid tank 20, and the residual gas is conveyed to an inlet of a second separation membrane component 7 through an outlet of the vacuum pump 19, mixed with the air after the precooling surface cooler 3 and then enters the second separation membrane component 7 for recycling and purification.
The NMP purification method and system can realize the online recovery and purification of the NMP in the coating procedure and the seamless butt joint with the production, while the traditional purification process needs to send the recovered NMP waste liquid to an external professional manufacturer for treatment and cannot realize the on-site production. The system adopts the gas separation membrane component to realize the separation of NMP and air under the gas state (about 80 ℃), and reduces the energy consumption of condensation cooling (less than 20 ℃) and zeolite rotating wheel desorption regeneration compared with the prior commonly used NMP-coated condensation and zeolite adsorption treatment process. Compared with the traditional distillation and rectification purification process, the invention can obviously reduce the energy consumption level in the aspect of purification. By the system, cyclic utilization of NMP in a factory can be realized, and only a small amount of NMP new liquid needs to be supplemented; the NMP raw material purchasing cost is reduced fundamentally. After the gas discharged from the coating machine is subjected to membrane treatment by the system, most of the gas is circulated back to the coating machine for repeated recycling, so that the cleanliness of the gas is ensured, the consistency of the product quality in the coating oven 1 is ensured, and only a small amount of gas is discharged up to the standard.
The above embodiments are only preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equally replaced or changed within the scope of the present invention.
Claims (10)
1. A lithium ion battery coating procedure NMP purification method is characterized by comprising the following steps:
s1: performing primary condensation, namely condensing the high-temperature waste gas containing NMP through a precooling surface cooler, condensing a small amount of NMP liquid and conveying the small amount of NMP liquid to a first NMP liquid storage tank;
s2: gas compression, namely compressing the waste gas after primary condensation by a compressor;
s3: separating NMP, namely separating NMP-containing gas from the waste gas compressed by the compressor through a separation component;
s4: collecting NMP, namely conveying the NMP-containing gas to a pressure buffer assembly;
s5: separating high boiling point impurities, namely conveying NMP gas and NMP liquid in the pressure buffer assembly to a negative pressure flash tank, and separating the high boiling point impurities and gaseous NMP through liquid state;
s6: and (3) obtaining NMP pure liquid, conveying gaseous NMP to a vacuum condenser for condensation under the pumping action of a vacuum pump, separating out the NMP pure liquid and discharging the NMP pure liquid to an NMP pure liquid tank.
2. The method of claim 1, wherein in the step S3, the separation module comprises a first separation membrane module and a second separation membrane module, and the specific separation process of NMP is as follows: the waste gas compressed by the compressor is led into a first separation membrane component to separate first permeation gas and first permeation residual gas, then the first permeation residual gas is led into a second separation membrane component to separate second permeation gas and second permeation residual gas, and finally the first permeation gas and the second permeation gas containing NMP are conveyed to a pressure buffering component.
3. The method according to claim 2, wherein the second residual gas is divided into two paths, one path of the second residual gas accounts for 90% of the total gas and is recycled by a recycling component, and the other path of the second residual gas accounts for 10% of the total gas and is discharged to the external environment through an external discharge port.
4. The method for purifying NMP in the coating process of a lithium ion battery according to claim 3, wherein the recycling of the recycling component comprises the following specific steps: and conveying the recycled second residual gas to an electric heater through a circulating fan of the coating oven, heating the second residual gas by the electric heater, conveying the heated second residual gas to the coating oven to produce high-temperature waste gas containing NMP, and conveying the high-temperature waste gas containing NMP to a pre-cooling surface cooler through an exhaust fan of the coating oven to form circulation.
5. The method of claim 1, wherein in step S4, the pressure buffer assembly comprises a first pressure buffer tank and a second pressure buffer tank, and the NMP is collected by: carry the gas that contains NMP to first pressure buffer tank, when first pressure buffer tank reached the settlement pressure, the gas that contains NMP switches through first valve group and carries second pressure buffer tank, and the NMP gas that gets into first pressure buffer tank simultaneously separates out liquid NMP under the pressure effect, and liquid NMP discharges the second NMP liquid storage tank in the first pressure buffer tank, and gaseous NMP enters into the negative pressure flash tank, and NMP liquid enters into the negative pressure flash tank through going out the liquid pump in the second NMP liquid storage tank.
6. The lithium ion battery coating procedure NMP purification method according to claim 1, wherein in the S5, the specific separation process of high boiling point impurities is: liquid NMP in the negative pressure flash tank is heated and circulated by a circulating pump and a heat exchanger, low boiling point NMP is changed into gas state, high boiling point impurities are gradually enriched in liquid state and discharged to a high boiling point impurity liquid tank through a second valve group, and the gas state NMP is conveyed to a vacuum condenser through a vacuum pump.
7. The method according to claim 1, wherein in S6, gaseous NMP in the negative pressure flash tank is condensed by a vacuum condenser, and the remaining gas is sent to an inlet of the second separation membrane module through an outlet of a vacuum pump, mixed with pre-cooled surface air cooler and then sent to the second separation membrane module.
8. A lithium ion battery coating procedure NMP purification system is characterized by comprising a precooling surface cooler, a first NMP liquid storage tank, a compressor, a separation assembly, a pressure buffer assembly, a negative pressure flash tank, a vacuum pump, a vacuum condenser and an NMP pure liquid tank;
the precooling surface cooler is connected with the compressor and the first NMP liquid storage tank;
the compressor is connected with the separation assembly;
the separation assembly is connected with the pressure buffering assembly;
the pressure buffer assembly is connected with a negative pressure flash tank;
the negative pressure flash tank is connected with a vacuum pump;
the vacuum condenser is connected between the vacuum pump and the negative pressure flash tank;
the NMP pure liquid tank is connected with a vacuum condenser.
9. The lithium ion battery coating procedure NMP purification system of claim 8, wherein the recovery component comprises a coating oven circulating fan, an electric heater, a coating oven and a coating oven exhaust fan;
the coating oven circulating fan is connected with the separation assembly;
the electric heater is connected with a circulating fan of the coating oven;
the coating oven is connected with the electric heater;
the coating oven exhaust fan is connected with the coating oven.
10. The lithium ion battery coating process NMP purification system of claim 8, further comprising a circulation pump and a heat exchanger, wherein the circulation pump is connected with the negative pressure flash tank, the heat exchanger is connected with the negative pressure flash tank, and a second valve group is connected between the heat exchanger and the circulation pump.
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