CN1111522C - Technology for recovery of N-methyepyrrolidone from treatment of lithium cell industrial waste gas - Google Patents
Technology for recovery of N-methyepyrrolidone from treatment of lithium cell industrial waste gas Download PDFInfo
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- CN1111522C CN1111522C CN 00123787 CN00123787A CN1111522C CN 1111522 C CN1111522 C CN 1111522C CN 00123787 CN00123787 CN 00123787 CN 00123787 A CN00123787 A CN 00123787A CN 1111522 C CN1111522 C CN 1111522C
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- gas
- methyl pyrrolidone
- lithium cell
- recovery
- recovery technology
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Abstract
The present invention relates to a technology for recovering N-methyl pyrrolidone in the aspect of treating lithium cell industrial waste, which comprises: under ordinary pressure, organic waste gas is cooled by a cooler and a condenser to obtain high-concentration NMP solution; after adsorbing residual NMP by activated carbon fiber, the cooled gas is directly exhausted to atmosphere. The present invention has the advantages of scientific and reasonable recovery technology, simple and easy operation, little investment and obvious effect. By using the present invention, the purification rate of waste gas is 95%, and the recovery rate of N-methyl pyrrolidone is from 80 to 98%. Thus, the requirements of environmental protection is achieved, and the purpose of N-methyl pyrrolidone recovery is achieved.
Description
Technical field
The present invention relates to the manufacturing off gas treatment of battery, the recovery technology of N-Methyl pyrrolidone during particularly a kind of lithium cell industrial gaseous waste is handled.The physical data of N-Methyl pyrrolidone (code name NMP) is as follows: molecular formula molecular weight boiling point density solvability flash-point Lower Explosive Limit
(℃) gram/rice
3℃ (volume %) C in 25 ℃ of water
5H
9NO 99.13 202 1.026 solvable 86 2.18N-methyl-2-pyrrolidones are colourless liquid, have the amine flavor, and little poison is soluble in water, is heated easily to decompose and emits toxic substance NO
X
Background technology
In lithium cell was produced, the main component of exhaust gas discharged was NMP, and content is 0.06%-0.5%, and all the other are empty G﹠W.In Germany, N-Methyl pyrrolidone is decided to be three grades of hazardous materials, and German Environmental Protection Agency stipulates that its emission concentration is 100PPM.Though at present in China country " discharge standard of air pollutants ", N-Methyl pyrrolidone is not formulated emission standard as yet, " production plant air objectionable impurities maximum permissible concentration " in " Design of Industrial Enterprises hygienic standard ", do not stipulate the concentration of N-Methyl pyrrolidone yet, but NMP becomes restricted compound in fact already, on the one hand, its taste makes us being difficult to accepting, simultaneously, the price of NMP is very high, and therefore directly discharging not only damages environment, human health is damaged, be again the waste of resource simultaneously, enterprise is also caused the burden of dual economy, the fine pressure of existing environmental protection, the consumption costs that also has solvent to use, so recycling NMP organic exhaust gas promptly can solve environmental issue, also most of solvent recuperation can be used again simultaneously.
Summary of the invention
The recovery technology of N-Methyl pyrrolidone during the lithium cell industrial gaseous waste that the purpose of this invention is to provide a kind of rate of recovery height that can make discharging waste gas reach emission request, NMP, less investment, instant effect in the lithium cell industrial gaseous waste is handled is handled.
The recovery technology of N-Methyl pyrrolidone comprised that 60-90 ℃ the organic exhaust gas that makes in the lithium cell industrial gaseous waste is under normal pressure during lithium cell industrial gaseous waste of the present invention was handled, be cooled to 10-30 ℃ through water cooler, be cooled to-10-0 ℃ through condenser again, obtain containing the solution of NMP; Gas after the cooling through the absorption of activated carbon fiber, when absorption reaches capacity, carries out desorption with rare gas element and reclaims NMP again, and the purified gas attached through absorbing carbon fiber directly enters atmosphere.
Wherein, the solution purity of the described NMP that obtains after cooling, condensation is 80-90%, water content 1-50%.
The temperature of described adsorption process is 10-30 ℃.
Describedly when promptly the content of NMP is higher than 100PPM in the purified gas, stop discharging when absorption when reaching capacity, and feed rare gas element activated carbon fiber is carried out desorption, the waste gas of this moment mixes with exhaust gas discharged at first through cooling off after, reenters removal process; Described rare gas element temperature is 150-220 ℃; Described purified gas outflow temperature is 10-40 ℃; Described desorption final vacuum temperature is 80-120 ℃, and temperature is 20-40 ℃ after cooling off.
The recovery technology combined carbon adsorption technology of N-Methyl pyrrolidone and the technology of coagulating during lithium cell industrial gaseous waste of the present invention is handled, use condensation method as pre-treatment, reclaim the most of N-Methyl pyrrolidone in the waste gas, adopt CAM to reclaim remaining NMP again; After absorption reaches capacity, rare gas element desorption again, the regenerated activated carbon recycles; Purified gas after adsorber absorption directly enters atmosphere; The organism desorption that the desorbing agent rare gas element will be adsorbed on the carbon concentrates and takes out of adsorber, and mixes with initial waste gas, reenters removal process.
Content through the N-Methyl pyrrolidone in the purified gas after this art breading reaches below the 100PPM, and the waste-gas cleaning rate is 95%, and the rate of recovery of NMP is 80-98%, both reach environmental requirement, reached the purpose that reclaims again, scientific and reasonable, simple, less investment, instant effect.
Embodiment
Further describe the present invention below in conjunction with embodiment.
Embodiment
The recovery technology of N-Methyl pyrrolidone during a kind of lithium cell industrial gaseous waste is handled, it comprises that 60-90 ℃ the organic exhaust gas that makes in the processing of lithium cell industrial gaseous waste is under normal pressure, be cooled to 20 ℃ through water cooler, be cooled to-6 ℃ through condenser again, obtain containing the solution of NMP; Gas after the cooling enters the carbon adsorber that is provided with activated carbon fiber, and the gas attached through absorbing carbon fiber directly enters atmosphere; When absorption reached capacity, after the content of NMP surpassed 100PPM during promptly gave vent to anger in carbon adsorber top, adsorption process stopped automatically, feeds nitrogen, and desorption and regeneration begins; At this moment, the gas that comes out from carbon adsorber bottom comes back to the waste gas opening for feed and repeats above-mentioned recycling step after cooling.
Wherein, the solution purity of the described NMP that obtains after cooling, condensation is 80-90%, water content 1-5%.
The temperature of described adsorption process is 15 ℃; Described nitrogen temperature is 200 ℃; Gas discharge temperature after the described absorption is 20-30 ℃; The gas temperature that comes out from carbon absorption bottom behind the described desorption is 80-120 ℃, and temperature is 20-40 ℃ after cooling off.
Claims (5)
1, the recovery technology of N-Methyl pyrrolidone during the lithium cell industrial gaseous waste is handled, it is characterized in that comprising that 60-90 ℃ the organic exhaust gas that makes in the lithium cell industrial gaseous waste is under normal pressure, be cooled to 10-30 ℃ through water cooler, be cooled to-10-0 ℃ through condenser again, obtain containing the solution of N-Methyl pyrrolidone; Residual gas after the condensation cooling is again through the absorption of activated carbon fiber, when the content of N-Methyl pyrrolidone in the purified gas is higher than 100PPM, promptly when absorption reaches capacity, with temperature is that 150-220 ℃ rare gas element carries out desorption and reclaims N-Methyl pyrrolidone, and the purified gas attached through absorbing carbon fiber directly enters atmosphere.
2, recovery technology as claimed in claim 1 is characterized in that described adsorption temp is 10-30 ℃.
3, recovery technology as claimed in claim 1, it is characterized in that when the content of N-Methyl pyrrolidone in the purified gas is higher than 100PPM, promptly when absorption reaches capacity, stop discharging, and the feeding rare gas element carries out desorption to activated carbon fiber, the waste gas of this moment mixes with initial exhaust gas discharged after cooling off, and reenters removal process.
4, recovery technology as claimed in claim 1 is characterized in that the Purge gas outflow temperature is 10-40 ℃.
5, recovery technology as claimed in claim 1 is characterized in that described desorption final vacuum temperature is 80-120 ℃, and temperature is 20-40 ℃ after cooling off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00123787 CN1111522C (en) | 2000-09-06 | 2000-09-06 | Technology for recovery of N-methyepyrrolidone from treatment of lithium cell industrial waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00123787 CN1111522C (en) | 2000-09-06 | 2000-09-06 | Technology for recovery of N-methyepyrrolidone from treatment of lithium cell industrial waste gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1285347A CN1285347A (en) | 2001-02-28 |
| CN1111522C true CN1111522C (en) | 2003-06-18 |
Family
ID=4590135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00123787 Expired - Fee Related CN1111522C (en) | 2000-09-06 | 2000-09-06 | Technology for recovery of N-methyepyrrolidone from treatment of lithium cell industrial waste gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1111522C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1944403B (en) * | 2006-10-23 | 2011-01-19 | 东莞新能源电子科技有限公司 | Process for recovering NMP in lithium cell membrance sheet drying process |
| JP5776231B2 (en) * | 2011-03-09 | 2015-09-09 | 三菱化学エンジニアリング株式会社 | NMP distillation equipment |
| CN108096977A (en) * | 2017-12-28 | 2018-06-01 | 杭州捷瑞空气处理设备有限公司 | The processing method and system for the exhaust gas that lithium battery recovery processing generates in the process |
| 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 |
-
2000
- 2000-09-06 CN CN 00123787 patent/CN1111522C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1285347A (en) | 2001-02-28 |
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