CN1944403A - Process for recovering NMP in lithium cell membrance sheet drying process - Google Patents
Process for recovering NMP in lithium cell membrance sheet drying process Download PDFInfo
- Publication number
- CN1944403A CN1944403A CNA2006101229649A CN200610122964A CN1944403A CN 1944403 A CN1944403 A CN 1944403A CN A2006101229649 A CNA2006101229649 A CN A2006101229649A CN 200610122964 A CN200610122964 A CN 200610122964A CN 1944403 A CN1944403 A CN 1944403A
- Authority
- CN
- China
- Prior art keywords
- nmp
- air
- cooling
- lithium cell
- blast inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
Landscapes
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention discloses NMP recovering process for lithium cell membrane drying course. One sealed circulating pipeline system is adopted, the circulating airflow in the pipeline system is first heated for stoving the lithium cell membrane and absorbing NMP from the membrane, the airflow containing NMP is then exhausted via the exhaust port and cooled to separate out excessive NMP, and the airflow with the NMP separated out is finally returned via the air inlet for circular use. The present invention has the advantages of high recovering rate, environment friendship, capacity of raising product quality, etc.
Description
Technical field:
The present invention relates to poly-lithium battery product manufacturing technology field, especially relate to the recovery technology of NMP in a kind of lithium cell membrance drying process.
Background technology:
NMP (N-Methyl pyrrolidone) is a colourless transparent oil liquid, and little have an amine flavor, fusing point-24.4 ℃, and 203 ℃ of boiling points, 95 ℃ of flash-points, volatility is low, thermostability and chemical stability height.Because of its good physicochemical performance, be widely used in the lithium cell industry.
Usually when making lithium cell, need will be coated with one layer of polymeric on the positive pole of battery, the negative material, this polymer materials need pass through drying treatment then by being coated on the surface of electrode slice material behind the organic solvent dissolution, with organic solvent by spinning off on the positive and negative plate.Because NMP has plurality of advantages such as flash-point height, security are good, and be used as organic solvent generally employing in the lithium cell manufacturing.But in carrying out the exsiccant process, NMP will all become gas, and by in the air of discharging with blower fan.Because NMP is a kind of meeting air is produced the chemical substance of polluting, if directly enter in the air, it will form environmental pollution.Simultaneously, NMP directly being discharged, also is to raw-material a kind of waste.At this situation, production firm has begun NMP is reclaimed at present.For example see that number of patent application is: the Chinese invention patent application specification of 00123787.X, this patent adopt the bonded mode of condensation and absorption that NMP is reclaimed.This process flow of knocking off is long, because it adopts degree of depth condensation, energy consumption is higher simultaneously.And adopt following two kinds to reclaim technology in the actual production technology at present: 1, brand-new wind heats full refrigerated recovery technology; 2, the VOC runner reclaims, and principle and drying shed dehumidification principle are identical, are extensively promoted.But the facility investment of these two kinds of technologies and energy consumption are all very high.
In addition, when NMP is reclaimed, will guarantee the exsiccant effect simultaneously, and this also is a problem that needs solution at present.
In the lithium cell membrance drying, its drying effect is mainly by following three key elements decision: blow in the dry air quantity (wind speed), dry wind of membrane surface NMP content from distance (temperature), the time of drying of saturation value.In order to improve and accelerate the diaphragm drying, generally all be to experimentize, with the production capacity that improves coating machine, improve drying effect from above-mentioned three aspects.For example: improve the dry air quantity of blowing over membrane surface, air quantity is designed by the up-to-date 7500CMH of 3000CMH, 4500CMH.NMP content is from the distance of saturation value in the raising dry wind, and drying temperature constantly promotes by 100 ℃, 110 ℃, 120 ℃, 140 ℃, follows temperature to raise, and the NMP saturation value raises, to help absorbing new evaporable NMP.Prolong time of drying; Coating machine makes five sections coatings into by three sections dryings, and the coating captain constantly extends to present 21 meters by 9 meters, 12 meters, 15 meters.
Summary of the invention:
Technical problem to be solved by this invention is to overcome the existing deficiency of present product manufacture, is simultaneously guaranteeing exsiccant effect prerequisite, and the recovery technology of NMP in a kind of energy-conservation, lithium cell membrance drying process that the rate of recovery is high is provided.
For solving the problems of the technologies described above, the present invention has adopted following technical scheme: adopt airtight, round-robin tubing system in this recovery technology, simultaneously tubing system internal recycle air-flow is carried out cooling process, wherein unnecessary NMP is constantly separated out; Circulating current in the described tubing system through heating after, lithium cell membrance is dried, be heated air-flow simultaneously and will absorb NMP on the diaphragm; The air-flow that then contains NMP is discharged through exhaust outlet, and through cooling process; The saturation value of the NMP content of gas reduces in the air-flow of cooling back, and air-flow will be separated out unnecessary NMP, and the return air of separating out at last behind the NMP is entered by blast inlet through blower fan, through heating diaphragm is carried out drying once more.
Described tubing system comprises blast inlet, air outlet, cooling recovery channel, direct piping and dry place, wherein, be provided with gas-heating apparatus between blast inlet and the diaphragm dry place, the air communication that enters by blast inlet is crossed to enter in the dry place after the heating unit heating diaphragm is carried out drying; Blast inlet, air outlet place all are equipped with blower fan, enter blast inlet, are discharged by air outlet by blower fan by blower fan to make gas; Cooling recovery channel and direct piping are communicated with the blower fan at blast inlet, air outlet place, and are provided with air pressure valve in cooling recovery channel and direct piping; Blast inlet, air outlet, cooling recovery channel, direct piping and diaphragm dry place constitute airtight, a round-robin connecting pipe system.
When the present invention works, enter dry place through heated air stream, hot blast is through lithium cell membrance the time, and the nmp solvent volatilization on the diaphragm enters in the hot gas flow, and the hot gas flow that contains NMP subsequently enters refrigerating unit through air outlet and cools off.The hot gas flow that contains NMP is through after the cooling process, and the NMP saturation concentration of gas reduces in the air-flow, and air-flow will be separated out unnecessary NMP, and the return air of then separating out behind the NMP is entered by blast inlet through blower fan, through heating diaphragm is carried out drying once more.Constantly circulation thus.The present invention reclaims that process using is airtight, the round-robin tubing system, is in theory 100% to reclaim, and not to the direct discharging waste gas in the external world, the dust in the external environment also can't enter coating machine and pollutes diaphragm simultaneously.This shows that the present invention has the environmental protection of helping, resource reutilization, improves workshop condition, improves plurality of advantages such as product quality.
Description of drawings:
Fig. 1 is the synoptic diagram of tubing system of the present invention;
Embodiment:
Among the present invention the recovery process using of NMP airtight, round-robin tubing system.Wherein, the wind that is entered by blast inlet carries out drying through the heating back to the diaphragm in the drying plant, and hot gas flow will absorb NMP on the diaphragm simultaneously; The air-flow that contains NMP is after exhaust outlet is discharged, and through cooling process, gas contains the saturation value reduction of NMP in the air-flow of cooling back, air-flow will be separated out unnecessary NMP, the return air of then separating out behind the NMP is entered by blast inlet through blower fan, through heating diaphragm is carried out drying once more, so circulation.
See Fig. 1, the tubing system that adopts comprises among the present invention: blast inlet 1, air outlet 2, cooling recovery channel 3, direct piping 4 and dry place 5.Blast inlet 1 and air outlet 2 connects dry places 5, and the diaphragm of lithium cell will drive to be entered in the dry place 5 by opening for feed by coating machine dries processing, is sent by discharge port through the diaphragm after drying at last.Wherein, be provided with gas-heating apparatus 11 between blast inlet 1 and the diaphragm dry place 5, the air communication that enters by blast inlet 1 is crossed to enter in the diaphragm dry place 5 after heating unit 11 heating diaphragm is carried out drying; Blast inlet 1, air outlet 2 places all are equipped with blower fan 12,21, enter blast inlet, are discharged by air outlet 2 by blower fan 21 by blower fan 12 to make gas.Cooling recovery channel 3 and direct piping 4 are communicated with the blower fan 12,21 at blast inlet 1, air outlet 2 places, and are provided with air pressure valve 6 in cooling recovery channel 3 and direct piping 4, to regulate airshed.
Above-mentioned blast inlet 1, air outlet 2, cooling recovery channel 3, direct piping 4 and diaphragm dry place 5 constitute airtight, a round-robin connecting pipe system.
Cooling recovery channel 3 has a refrigerating unit 31, and the hot gas flow that is entered by air outlet 2 enters blast inlet 1 by blower fan 12 again after refrigerating unit 31 coolings.Because NMP is along with the reduction of temperature, its aerial saturation concentration numerical value can reduce, so contain hot gas flow by NMP behind apparatus for supercooling 3, if the NMP concentration in the gas surpasses its saturation concentration numerical value under cooling temperature, will separate out NMP by gas.Because the present invention is less demanding to cooling off, in the present embodiment, refrigerating unit 31 can adopt water cooling plant.
In addition, in cooling recovery channel 3, also has a total-heat exchanger 32.The hot gas flow that is entered by air outlet 2 enters refrigerating unit 31 again through behind the total-heat exchanger 32, and flows to blast inlet 1 by the air channel again after also travelling back across total-heat exchanger 32 by refrigerating unit 31 effusive cooling gases.A part of heat of hot gas conducts to cooling back gas by total-heat exchanger 32 like this, thereby has reduced the loss of heat, has improved heat utilization ratio, cuts down the consumption of energy.
Air pressure valve 6 is used in many places in this tubing system, and it is used to control closing and opening of air flue, with the circulating path of control air-flow, gaseous tension or the like.
During use, lithium cell membrance enters dry place 5 under coating machine drives.At this moment, under the agitating of blower fan 12, air-flow enters dry place 5 by blast inlet 1, is extracted out by air outlet 2 through blower fan 21 again.After air-flow enters blast inlet 1, at first heat, through entering in the dry place 5 behind the air pressure valve 6 adjusting wind speed, lithium cell membrance is dried processing again through 11 pairs of air-flows of heating unit.Hot blast is through diaphragm the time, and the nmp solvent volatilization on the diaphragm enters in the hot gas flow, and the hot gas flow that contains NMP subsequently enters cooling recovery channel 3 and direct piping 4 through air outlet 2.Because this moment, drying process just begins, and the NMP concentration in the air-flow does not also reach callable degree.Air-flow can be entered in the dry place 5 by blast inlet 1 by blower fan 12 and finish circulation more directly by behind the direct piping 4 this moment.After the concentration in the air-flow reached certain numerical value, direct piping 4 was closed by air pressure valve 6, and hot gas flow will circulate by cooling recovery channel 3, also carry out the recovery of NMP simultaneously.Contain the cooling process of the hot gas flow of NMP through apparatus for supercooling 31, the NMP saturation concentration numerical value of gas reduces in the air-flow of cooling back, air-flow will be separated out unnecessary NMP, the return air of then separating out behind the NMP is entered by blast inlet 1 through blower fan 12, through after the heating of heating unit diaphragm is carried out drying once more.Constantly circulation thus.The NMP that wherein separates out can reclaim once more and utilize.
The present invention reclaims the mode that technology does not adopt direct discharging, but utilizes circulation and recovery process to handle, and is 100% recovery and zero release in theory.Owing to do not have extraneous air intake and to extraneous air draft, the wind system good uniformity.External environment dust also can't enter coating machine and pollute diaphragm owing to whole tubing is airtight while, helped environmental protection, resource reutilization, improves workshop condition, improved product quality.
Below in conjunction with real data the principle of the invention is further detailed.
See the following form, this is the aerial correlation technique data of NMP.
| Dew-point temperature ℃ dp | Saturated vapor pressure (Kpa) | Volume ratio | Mass ratio (g/kg) |
| 20 | 0.04 | 0.04％ | 1.35 |
| 40 | 0.16 | 0.16％ | 5.40 |
| 50 | 0.32 | 0.32％ | 10.82 |
| 60 | 0.53 | 0.52％ | 17.95 |
| 79 | 1.33 | 1.31％ | 45.42 |
| 100 | 3.2 | 3.16％ | 111.36 |
| 120 | 5.8 | 5.73％ | 207.33 |
| 140 | 14.2 | 14.02％ | 556.55 |
| 150 | 21.6 | 21.32％ | 925.19 |
Following table is the aerial security parameter table of NMP.
| Volume ratio | Mass ratio g/kg | |
| Lower Explosive Limit | 1.30％ | 45.4 |
| Upper explosive limit | 9.50％ | 325.6 |
Following table is to use when of the present invention, when under 40 ℃ and 20 ℃ (cooling temperature), NMP being reclaimed respectively, and the data (referring to Fig. 1) of gathering at tubing system A, D, E, F, G, H, I several Control point.
| The reference mark | A | The coating machine volatilization adds 0.67 g in the per kilogram air | D | E | F | G | 3.35 g are separated out in condensation in the per kilogram air | H | I | |
| Air quantity (CMH) | 7,500 | 7,500 | 6,000 | 1,500 | 1,500 | 1,500 | 1,500 | |||
| Under 40 ℃ of recovered temperatures | The content of NMP in the dry wind (g/k g) | 8.08 | 8.75 | 8.75 | 8.75 | 8.75 | 5.4 | 5.4 | ||
| Under 20 ℃ of recovered temperatures | 4.03 | 4.7 | 4.7 | 4.7 | 4.7 | 1.35 | 1.35 | |||
Below we specify with 40 ℃ recovered temperature.Before equipment just brings into operation, NMP concentration very little (can ignore) in the air in the total system, the equipment of being accompanied by brings into operation, and the NMP on the diaphragm constantly volatilizees, the continuous accumulation of beginning NMP in the air in the system, concentration constantly increases.When concentration surpasses 5.4g/kg when (referring to preceding table, containing 5.4g in the per kilogram air when NMP dew point is 40 ℃), condenser just will all be separated out above the NMP of 5.4g/kg content.So when air-flow behind apparatus for supercooling, the NMP concentration in the air-flow remains on 5.4g/kg always.Be that the NMP content that H point, I are ordered remains on 5.4g/kg always.
The air quantity that A is ordered is 7500CMH (just 9710kg/ hour).Because the volatile quantity of the diaphragm NMP of lithium cell is 6.5kg, through behind the dry place, the NMP content=6.5*1000/9710=0.67g that adds in the per kilogram gas, so A NMP content=8.75 (D the point)-0.67=8.08g/kg of ordering.
The air quantity that H is ordered is 1500CMH (just 1942kg/ hour), the NMP amount=3.35g that separates out in the per kilogram air, NMP content=5.4+3.35=8.75g/kg that D point, E point, F are ordered.
No matter it is much that coating machine NMP consumption hourly changes, the NMP content that H point, I are ordered is constant, therefore can both accurately calculate the content of each point.
As seen from the above, return air amount 6000CMH adds cooling process wind 1500CMH and sends into coating machine, reaches the design air flow of 7500CMH, satisfies this key element of dry air quantity of blowing over membrane surface.
Following table is NMP content contrast table relatively in the dry wind in the present invention and the present two kinds of ways of recycling.
| The NMP content (g/kg) that dry air blast A is ordered | The saturated content of NMP (g/kg) in 120 ℃ of following air | Distance (g/kg) from saturated content | ||
| Brand-new wind heating cooling way of recycling | 0 | 207.33 | 207.33 | |
| VOC runner way of recycling | 0 | 207.33 | 207.33 | |
| The present invention | 40 ℃ of recovered temperatures | 8.08 | 207.33 | 199.25 |
| 20 ℃ of recovered temperatures | 4.03 | 207.33 | 203.3 | |
By this table as can be seen,, all differ about 200g/kg from the distance of saturation value though the content of NMP is 8.08g/kg and 4.03g/kg in the technology of the present invention, far from saturation value.Therefore satisfy NMP content in the dry wind from saturation value apart from this key element.
In addition, the present invention does not change coating machine length, surface covered yet, so time of drying is constant.Be three key elements that the present invention does not change decision lithium cell membrance drying effect.
For security of the present invention, the Design of ventilation code requirement of inflammable gas is usually: inflammable gas concentration is lower than 20% of Lower Explosive Limit.Draw by the aerial security parameter table of NMP, the Lower Explosive Limit of NMP is 1.3%, it is to be lower than 1.3% * 20%=0.26% that its safe design requires, the NMP content that dry air blast A is ordered is 8.08g/kg, the volume ratio of the corresponding lower limit of blasting is 0.24%, therefore, this design meets safety standard.
Below be the present invention and present two kinds of way of recycling facility investment expense comparison sheets:
| Relatively | Brand-new wind heating cooling way of recycling | VOC runner way of recycling | The present invention is 40 ℃ of coolings |
| Main frame investment (RMB/ platform) | 100,000 | 450,000 | 50,000 |
| Freeze water machine configuration set (RMB/ platform) | 250,000 | 64,158 | 5,132 |
| Heater configuration (RMB/ platform) | 215,417 | 121,647 | 36,667 |
| Distribution expense of increasing capacity (RMB/ platform) | 166,020 | 199,500 | 40,000 |
| Facility investment adds up to (RMB) | 731,437 | 835,305 | 131,799 |
| The expense ratio | 6 | 6 | 1 |
By this table as can be seen, present relatively way of recycling is used the present invention, and expense is minimum.
Claims (7)
1, the recovery technology of NMP in the lithium cell membrance drying process is characterized in that: adopt airtight, round-robin tubing system in this recovery technology, simultaneously tubing system internal recycle air-flow is carried out cooling process, contained unnecessary NMP is wherein constantly separated out; Circulating current in the described tubing system through heating after, lithium cell membrance is dried, be heated air-flow simultaneously and will absorb NMP on the diaphragm; The air-flow that then contains NMP is discharged through exhaust outlet, and through cooling process; The saturation value of the NMP content of gas reduces in the air-flow of cooling back, and air-flow will be separated out unnecessary NMP, and the return air of separating out at last behind the NMP is entered by blast inlet through blower fan, through heating diaphragm is carried out drying once more.
2, the recovery technology of NMP in the lithium cell membrance drying process according to claim 1, it is characterized in that: the temperature of described dry lithium cell membrance hot blast is 100～140 ℃.
3, the recovery technology of NMP in the lithium cell membrance drying process according to claim 1 is characterized in that: the temperature of described cooling back air-flow is 20～40 ℃.
4, the recovery technology of NMP in the lithium cell membrance drying process according to claim 1, it is characterized in that: described tubing system comprises blast inlet (1), air outlet (2), cooling recovery channel (3), direct piping (4) and dry place (5), wherein:
Be provided with gas-heating apparatus (11) between blast inlet (1) and the diaphragm dry place (5), the air communication that is entered by blast inlet (1) is crossed to enter in the dry place (5) after heating unit (11) heating diaphragm is carried out drying;
Blast inlet (1), air outlet (2) locate all to be equipped with blower fan (12,21), enter blast inlet, are discharged by air outlet (2) by blower fan (21) to make gas pass through blower fan (12);
The blower fan (12,21) that cooling recovery channel (3) and direct piping (4) are located blast inlet (1), air outlet (2) is communicated with, and is provided with air pressure valve (6) in cooling recovery channel (3) and direct piping (4);
Blast inlet (1), air outlet (2), cooling recovery channel (3), direct piping (4) and diaphragm dry place (5) constitute airtight, a round-robin connecting pipe system.
5, the recovery technology of NMP in the lithium cell membrance drying process according to claim 4, it is characterized in that: described cooling recovery channel (3) has a refrigerating unit (31), and the hot gas flow that is entered by air outlet (2) enters blast inlet (1) by blower fan (12) again after refrigerating unit (31) cooling.
6, the recovery technology of NMP in the lithium cell membrance drying process according to claim 5, it is characterized in that: described also have a total-heat exchanger (32) in cooling recovery channel (3), the hot gas flow that is entered by air outlet (2) enters refrigerating unit (31) after through total-heat exchanger (32) again, flows to blast inlet by the air channel again after travelling back across total-heat exchanger (32) by the effusive cooling gas of refrigerating unit (31).
7, the recovery technology of NMP in the lithium cell membrance drying process according to claim 5 is characterized in that: described refrigerating unit (31) adopts water cooling plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101229649A CN1944403B (en) | 2006-10-23 | 2006-10-23 | Process for recovering NMP in lithium cell membrance sheet drying process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101229649A CN1944403B (en) | 2006-10-23 | 2006-10-23 | Process for recovering NMP in lithium cell membrance sheet drying process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1944403A true CN1944403A (en) | 2007-04-11 |
| CN1944403B CN1944403B (en) | 2011-01-19 |
Family
ID=38044081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101229649A Expired - Fee Related CN1944403B (en) | 2006-10-23 | 2006-10-23 | Process for recovering NMP in lithium cell membrance sheet drying process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1944403B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003870A (en) * | 2010-04-13 | 2011-04-06 | Ane株式会社 | Heat-elimination recovery type drying device |
| CN105932226A (en) * | 2016-05-19 | 2016-09-07 | 宁德时代新能源科技股份有限公司 | Drying method of battery pole piece |
| CN108365291A (en) * | 2018-03-23 | 2018-08-03 | 中航锂电技术研究院有限公司 | A kind of circulating NMP recovery systems of inert gas and its operation method |
| CN108404604A (en) * | 2018-03-23 | 2018-08-17 | 中航锂电技术研究院有限公司 | The circulating low dew point NMP recovery systems of one kind and its operation method |
| CN112768796A (en) * | 2020-12-30 | 2021-05-07 | 中科院过程工程研究所南京绿色制造产业创新研究院 | Method for treating waste lithium battery |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3726245A1 (en) * | 1987-08-07 | 1989-02-16 | Boewe Passat Reinigung | METHOD AND DEVICE FOR RECOVERING SOLVENT GAS FROM AN AIRFLOW |
| DE4319828A1 (en) * | 1993-06-16 | 1994-12-22 | Henkel Kgaa | Modified drying process using superheated steam in the drying medium and its application |
| CN1111522C (en) * | 2000-09-06 | 2003-06-18 | 北京迈胜普技术有限公司 | Technology for recovery of N-methyepyrrolidone from treatment of lithium cell industrial waste gas |
| CN1300109C (en) * | 2004-10-20 | 2007-02-14 | 天津化工研究设计院 | Process for recovery of N-methylpyrrolidone from lithium cell discharge gas |
-
2006
- 2006-10-23 CN CN2006101229649A patent/CN1944403B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003870A (en) * | 2010-04-13 | 2011-04-06 | Ane株式会社 | Heat-elimination recovery type drying device |
| CN105932226A (en) * | 2016-05-19 | 2016-09-07 | 宁德时代新能源科技股份有限公司 | Drying method of battery pole piece |
| CN108365291A (en) * | 2018-03-23 | 2018-08-03 | 中航锂电技术研究院有限公司 | A kind of circulating NMP recovery systems of inert gas and its operation method |
| CN108404604A (en) * | 2018-03-23 | 2018-08-17 | 中航锂电技术研究院有限公司 | The circulating low dew point NMP recovery systems of one kind and its operation method |
| CN108365291B (en) * | 2018-03-23 | 2023-07-25 | 中创新航技术研究院(江苏)有限公司 | Inert gas circulating type NMP (N-methyl pyrrolidone) recovery system and operation method thereof |
| CN108404604B (en) * | 2018-03-23 | 2023-11-28 | 中创新航技术研究院(江苏)有限公司 | Circulating type low dew point NMP (N-methyl pyrrolidone) recovery system and operation method thereof |
| CN112768796A (en) * | 2020-12-30 | 2021-05-07 | 中科院过程工程研究所南京绿色制造产业创新研究院 | Method for treating waste lithium battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1944403B (en) | 2011-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104083988B (en) | VOCs waste gas treatment method | |
| US10967323B2 (en) | Exhaust gas purifying and heat recovering system and method for sludge treatment | |
| CN1944403B (en) | Process for recovering NMP in lithium cell membrance sheet drying process | |
| CN205598694U (en) | NMP gas recovery system | |
| CN101045190A (en) | Method for recovering organic waste gas during printing or coating production | |
| CN105638874A (en) | Heat pump type grain drying tower with effect of recovering exhaust heat | |
| CN104436979B (en) | A kind of VOCs emission-control equipment | |
| CN104190197B (en) | Coke wet quenching tower top loss waste gas purification apparatus and process for purifying | |
| CN106831526A (en) | Reclaim, purify the device and method of N methyl pyrrolidones | |
| CN205759815U (en) | A kind of condensate disposal systems of organic exhaust gas | |
| JPS5515632A (en) | Dehumidifier | |
| WO2018033665A1 (en) | A method and an arrangement for recirculating air in a drying process | |
| CN110590633A (en) | Combined type NMP recovery system | |
| CN204854398U (en) | A air cooler for catalytic reforming | |
| CN203954992U (en) | A kind of VOCs exhaust treatment system | |
| CN101439237B (en) | Device for processing organic discharge gas produced in coating procedure | |
| CN205340479U (en) | Mix gas recovery device in polyimide film production | |
| CN1300109C (en) | Process for recovery of N-methylpyrrolidone from lithium cell discharge gas | |
| CN107403960A (en) | NMP in working procedure of coating lithium ion cell recovery essence steams purification recycling device | |
| CN201659077U (en) | Environment-friendly drying oven cover | |
| CN204522681U (en) | A kind of containing volatile organic matter industrial waste gas environment protection treating retracting device | |
| CN108296143A (en) | A kind of efficient cryogenic drying system of water based paint | |
| CN204837791U (en) | Can retrieve thermal heat pump type grain drying tower of waste gas | |
| CN212757294U (en) | Low-humidity circulating return air NMP recovery device | |
| CN103575126A (en) | Cooling-tower heat exchanger with evaporated water recovery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110119 Termination date: 20111023 |