CN113185441A - Purification method for reducing chroma of N-methyl pyrrolidone - Google Patents
Purification method for reducing chroma of N-methyl pyrrolidone Download PDFInfo
- Publication number
- CN113185441A CN113185441A CN202110452589.9A CN202110452589A CN113185441A CN 113185441 A CN113185441 A CN 113185441A CN 202110452589 A CN202110452589 A CN 202110452589A CN 113185441 A CN113185441 A CN 113185441A
- Authority
- CN
- China
- Prior art keywords
- methyl pyrrolidone
- crude product
- methylpyrrolidone
- reducing
- chroma
- 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.)
- Pending
Links
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000000746 purification Methods 0.000 title claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000012043 crude product Substances 0.000 claims abstract description 48
- 238000001179 sorption measurement Methods 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 238000004821 distillation Methods 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004813 Perfluoroalkoxy alkane Substances 0.000 claims 2
- 229920011301 perfluoro alkoxyl alkane Polymers 0.000 claims 2
- 239000004743 Polypropylene Substances 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000001259 photo etching Methods 0.000 abstract description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- -1 PFA Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 125000004428 fluoroalkoxy group Chemical group 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000003880 polar aprotic solvent Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pyrrole Compounds (AREA)
Abstract
The embodiment of the invention discloses a purification method for reducing the chroma of N-methyl pyrrolidone, which comprises the following steps: introducing the N-methyl pyrrolidone crude product into a primary reaction kettle, and adding activated carbon for adsorption treatment to obtain an adsorbed crude product; removing the active carbon in the crude product after the adsorption treatment, and then putting the crude product into a rectifying tower for rectifying to obtain rectified N-methyl pyrrolidone; and filtering the rectified N-methyl pyrrolidone to obtain purified N-methyl pyrrolidone. In the process of purifying the N-methyl pyrrolidone crude product by the method, the N-methyl pyrrolidone crude product is adsorbed by activated carbon, and the N-methyl pyrrolidone after adsorption treatment is rectified and filtered, so that the chroma of the purified N-methyl pyrrolidone is lower than 2, the purity of the N-methyl pyrrolidone is ensured, and the requirement of a photoetching process is greatly met.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a refining method for reducing the chroma of N-methyl pyrrolidone.
Background
N-methylpyrrolidinone (also called 1-methyl 2-pyrrolidone), NMP for short, is a polar aprotic solvent, and has the advantages of high boiling point, strong polarity, low viscosity, strong dissolving capacity, no corrosion, low toxicity, strong biodegradation capacity, low volatility, good chemical stability and good thermal stability. The N-methyl pyrrolidone is mainly applied to the industries of petrochemical industry, plastic industry, medicine, pesticide, dye, lithium ion battery manufacturing industry and the like, and is also applied to the aspects of photoresist remover, production of other electronic products, cleaning agent and the like. In the prior art, how to reduce the chroma of the N-methylpyrrolidone is not considered in the process of improving the quality of the N-methylpyrrolidone, for example, in patents CN201010602514 and CN201710287359, only cost investment, dangerousness and the like when the quality of the N-methylpyrrolidone is improved are considered, the chroma of the N-methylpyrrolidone is not considered, and the chroma of the N-methylpyrrolidone is lower than 2 when the N-methylpyrrolidone is used for a photoresist remover, so that the quality of photoetching is greatly reduced.
Disclosure of Invention
The embodiment of the invention provides a purification method for reducing the chroma of N-methyl pyrrolidone, and aims to solve the problem that the chroma of N-methyl pyrrolidone cannot be reduced when N-methyl pyrrolidone is used for a photoresist remover in the prior art.
The embodiment of the invention provides a refining method for reducing the chroma of N-methyl pyrrolidone, which comprises the following steps:
s1, introducing the N-methyl pyrrolidone crude product into a primary reaction kettle, and adding activated carbon for adsorption treatment to obtain an adsorbed crude product;
s2, removing the activated carbon in the crude product after adsorption treatment, and then putting the crude product into a rectifying tower for rectification to obtain rectified N-methylpyrrolidone;
s3, filtering the rectified N-methyl pyrrolidone to obtain purified N-methyl pyrrolidone.
Preferably, in the purification method for reducing the chroma of the N-methyl pyrrolidone, the mass of the activated carbon is 1-5% of the mass of the crude product of the N-methyl pyrrolidone.
Preferably, in the purification method for reducing the chroma of N-methylpyrrolidone, the adsorption treatment with activated carbon is performed, and the method comprises the following steps: adding activated carbon, and stirring at 20-60 deg.C for 20-100min to complete the adsorption treatment.
Preferably, in the purification method for reducing the chroma of N-methylpyrrolidone, the rectification is vacuum rectification.
Preferably, in the purification method for reducing the chromaticity of N-methylpyrrolidone, the bottom temperature in the rectifying tower is 100-120 ℃, the top temperature is 96-108 ℃, the temperature of condensed water is 0-5 ℃, and the reflux ratio is (10-50): 1. the absolute pressure at the bottom of the kettle is 800-5000 Pa.
Preferably, in the purification method for reducing the chromaticity of N-methylpyrrolidone, the rectification tower is made of quartz, and a valve in the rectification tower is made of PFA, PTFE or PVDF.
Preferably, in the purification method for reducing the chroma of N-methylpyrrolidone, the rectified N-methylpyrrolidone is filtered by a filter with a pore size of 1-10 microns.
Preferably, in the purification method for reducing the chromaticity of N-methylpyrrolidone, the housing of the filter is made of PVDF, PTFE, PFA, or PP.
Preferably, in the purification method for reducing the chromaticity of N-methylpyrrolidone, step S1, step S2, and step S3 are all under the condition of protective gas.
Preferably, in the purification method for reducing the chroma of the N-methyl pyrrolidone, the protective gas is nitrogen, and the purity of the nitrogen is higher than 99.9999%.
Compared with the prior art, the embodiment of the invention provides a purification method for reducing the chroma of N-methyl pyrrolidone, which comprises the following steps: introducing the N-methyl pyrrolidone crude product into a primary reaction kettle, and adding activated carbon for adsorption treatment to obtain an adsorbed crude product; removing the active carbon in the crude product after the adsorption treatment, and then putting the crude product into a rectifying tower for rectifying to obtain rectified N-methyl pyrrolidone; and filtering the rectified N-methyl pyrrolidone to obtain purified N-methyl pyrrolidone. In the process of purifying the N-methyl pyrrolidone crude product by the method, the N-methyl pyrrolidone crude product is adsorbed by activated carbon, and the N-methyl pyrrolidone after adsorption treatment is rectified and filtered, so that the chroma of the purified N-methyl pyrrolidone is lower than 2, the purity of the N-methyl pyrrolidone is ensured, and the requirement of a photoetching process is greatly met.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
The invention provides a purification method for reducing the chroma of N-methyl pyrrolidone, wherein the method comprises the following steps: introducing the N-methyl pyrrolidone crude product into a primary reaction kettle, and adding activated carbon for adsorption treatment to obtain an adsorbed crude product; removing the active carbon in the crude product after the adsorption treatment, and then putting the crude product into a rectifying tower for rectifying to obtain rectified N-methyl pyrrolidone; and filtering the rectified N-methyl pyrrolidone to obtain purified N-methyl pyrrolidone.
Wherein the N-methyl pyrrolidone crude product is prepared by thermal condensation reaction of gamma-butyrolactone and methylamine (40%) in a molar ratio of (1: 1.1-1.2), concentration and reduced pressure distillation, and the purity of the N-methyl pyrrolidone crude product is more than 99%.
In the embodiment of the invention, in the process of purifying the N-methyl pyrrolidone crude product, all operation processes are operated under the condition of protective gas, wherein the protective gas is nitrogen, the purity of the nitrogen is higher than 99.9999%, the mass of the activated carbon is 1-5% of the mass of the N-methyl pyrrolidone crude product, meanwhile, the crude product after adsorption treatment is rectified in a rectifying tower in a reduced pressure rectification mode, and then is filtered, so that the purification of the N-methyl pyrrolidone is completed, wherein the bottom temperature in the rectifying tower is 120-: 1. the absolute pressure at the bottom of the kettle is 800-5000 Pa; the rectification tower is made of quartz, a valve in the rectification tower is made of PFA (Poly fluoro alkoxy) material, PTFE (Polytetrafluoroethylene) material or PVDF (polyvinylidene fluoride), the activated carbon needs to be dried before adsorbing the N-methyl pyrrolidone crude product, and the activated carbon is stirred for 20-100min at the temperature of 20-60 ℃ to adsorb the N-methyl pyrrolidone crude product. In addition, when the N-methyl pyrrolidone is filtered after the rectification is finished, a filter with the aperture of 1-10 microns is adopted for filtering, and a filter with the aperture of 1-10 microns is adopted for filtering.
The chroma of N-methyl pyrrolidone purified in the following specific examples is below 2.
Example 1
S1, introducing the N-methyl pyrrolidone crude product into a primary reaction kettle, adding activated carbon, and stirring at 60 ℃ for 60min to complete the adsorption treatment, thereby obtaining an adsorption treated crude product; wherein the mass of the activated carbon is 1 percent of that of the crude product of the N-methyl pyrrolidone,
s2, removing the activated carbon in the crude product after adsorption treatment, and then putting the crude product into a rectifying tower for rectification to obtain rectified N-methylpyrrolidone; wherein the bottom temperature of the rectifying tower is 120 ℃, the top temperature of the rectifying tower is 108 ℃, the temperature of condensed water is 0 ℃, and the reflux ratio is 10: 1. the absolute pressure of the kettle bottom is 5000 Pa;
s3, filtering the rectified N-methyl pyrrolidone by using a filter with the pore size of 5 microns to obtain the purified N-methyl pyrrolidone.
Example 2
S1, introducing the N-methyl pyrrolidone crude product into a primary reaction kettle, adding activated carbon, and stirring at 40 ℃ for 40min to complete the adsorption treatment, thereby obtaining an adsorption treated crude product; wherein the mass of the activated carbon is 4 percent of that of the crude product of the N-methyl pyrrolidone,
s2, removing the activated carbon in the crude product after adsorption treatment, and then putting the crude product into a rectifying tower for rectification to obtain rectified N-methylpyrrolidone; wherein the bottom temperature of the rectifying tower is 100 ℃, the top temperature of the rectifying tower is 98 ℃, the temperature of the condensate water is 0 ℃, and the reflux ratio is 20: 1. the absolute pressure of the kettle bottom is 4000 Pa;
s3, filtering the rectified N-methyl pyrrolidone by using a filter with the pore diameter of 3 microns to obtain purified N-methyl pyrrolidone.
Example 3
S1, introducing the N-methyl pyrrolidone crude product into a primary reaction kettle, adding activated carbon, and stirring for 80min at 50 ℃ to complete the adsorption treatment, thereby obtaining an adsorption treated crude product; wherein the mass of the activated carbon is 2 percent of that of the crude product of the N-methyl pyrrolidone,
s2, removing the activated carbon in the crude product after adsorption treatment, and then putting the crude product into a rectifying tower for rectification to obtain rectified N-methylpyrrolidone; wherein the bottom temperature of the rectifying tower is 110 ℃, the top temperature of the rectifying tower is 103 ℃, the temperature of the condensate water is 0 ℃, and the reflux ratio is 30: 1, the absolute pressure of the kettle bottom is 4500 Pa;
s3, filtering the rectified N-methyl pyrrolidone by using a filter with the pore diameter of 8 microns to obtain purified N-methyl pyrrolidone.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A purification process for reducing the color of N-methyl pyrrolidone comprising the steps of:
s1, introducing the N-methyl pyrrolidone crude product into a primary reaction kettle, and adding activated carbon for adsorption treatment to obtain an adsorbed crude product;
s2, removing the activated carbon in the crude product after adsorption treatment, and then putting the crude product into a rectifying tower for rectification to obtain rectified N-methylpyrrolidone;
s3, filtering the rectified N-methyl pyrrolidone to obtain purified N-methyl pyrrolidone.
2. A purification process for reducing the colour of N-methylpyrrolidone, according to claim 1, characterized in that the mass of activated carbon is 1-5% of the mass of the crude product of N-methylpyrrolidone.
3. A purification process for reducing the chroma of N-methylpyrrolidone, according to claim 1, characterized in that said addition of activated carbon for the adsorption treatment comprises:
adding activated carbon, and stirring at 20-60 deg.C for 20-100min to complete the adsorption treatment.
4. A purification process for reducing the chroma of N-methylpyrrolidone, according to claim 1, characterized in that the rectification is a vacuum rectification.
5. A purification method for reducing the chroma of N-methylpyrrolidone, as claimed in claim 4, wherein the bottom temperature of the rectification column is 100-120 ℃, the top temperature of the rectification column is 96-108 ℃, the temperature of the condensed water is 0-5 ℃, and the reflux ratio is (10-50): 1. the absolute pressure at the bottom of the kettle is 800-5000 Pa.
6. The purification method for reducing the chromaticity of N-methylpyrrolidone according to claim 5, wherein the distillation column is made of quartz, and the valve in the distillation column is made of PFA, PTFE or PVDF.
7. A purification process for reducing the chroma of N-methylpyrrolidone, according to claim 1, characterized in that the rectified N-methylpyrrolidone is filtered with a filter having a pore size of 1-10 microns.
8. The purification method for reducing the chroma of N-methylpyrrolidone, according to claim 7, wherein the filter housing is made of PVDF, PTFE, PFA or PP.
9. The purification method for reducing the chroma of N-methylpyrrolidone according to claim 1, wherein steps S1, S2 and S3 are under the condition of protective gas.
10. A purification process according to claim 9, wherein the shielding gas is nitrogen and the purity of the nitrogen is higher than 99.9999%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110452589.9A CN113185441A (en) | 2021-04-26 | 2021-04-26 | Purification method for reducing chroma of N-methyl pyrrolidone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110452589.9A CN113185441A (en) | 2021-04-26 | 2021-04-26 | Purification method for reducing chroma of N-methyl pyrrolidone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113185441A true CN113185441A (en) | 2021-07-30 |
Family
ID=76979268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110452589.9A Pending CN113185441A (en) | 2021-04-26 | 2021-04-26 | Purification method for reducing chroma of N-methyl pyrrolidone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113185441A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696182A (en) * | 2009-09-10 | 2010-04-21 | 北京益利精细化学品有限公司 | Purifying method of N-methylpyrrolidone |
| CN102224137A (en) * | 2008-11-24 | 2011-10-19 | 巴斯夫欧洲公司 | Process for preparing an n-alkyllactam with improved color quality |
| CN102399179A (en) * | 2010-09-17 | 2012-04-04 | 上海化学试剂研究所 | The production method of ultrapure N-methylpyrrolidone |
| CN204689921U (en) * | 2015-04-29 | 2015-10-07 | 东莞市致格电池科技有限公司 | A kind of N-Methyl pyrrolidone purification devices |
| CN108299266A (en) * | 2018-01-30 | 2018-07-20 | 宁波大学 | The preparation method of high purity N-methyl pyrrolidone |
| CN111100055A (en) * | 2018-10-25 | 2020-05-05 | 中国石油化工股份有限公司 | Extraction-rectification recovery method of N-methyl pyrrolidone in waste solvent |
| CN111892525A (en) * | 2020-05-08 | 2020-11-06 | 迈奇化学股份有限公司 | N-methyl pyrrolidone for liquid crystal panel and production process thereof |
| CN111978233A (en) * | 2020-09-15 | 2020-11-24 | 安徽英特力工业工程技术有限公司 | Device for improving purity of NMP crude product after methylamine removal |
-
2021
- 2021-04-26 CN CN202110452589.9A patent/CN113185441A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102224137A (en) * | 2008-11-24 | 2011-10-19 | 巴斯夫欧洲公司 | Process for preparing an n-alkyllactam with improved color quality |
| CN101696182A (en) * | 2009-09-10 | 2010-04-21 | 北京益利精细化学品有限公司 | Purifying method of N-methylpyrrolidone |
| CN102399179A (en) * | 2010-09-17 | 2012-04-04 | 上海化学试剂研究所 | The production method of ultrapure N-methylpyrrolidone |
| CN204689921U (en) * | 2015-04-29 | 2015-10-07 | 东莞市致格电池科技有限公司 | A kind of N-Methyl pyrrolidone purification devices |
| CN108299266A (en) * | 2018-01-30 | 2018-07-20 | 宁波大学 | The preparation method of high purity N-methyl pyrrolidone |
| CN111100055A (en) * | 2018-10-25 | 2020-05-05 | 中国石油化工股份有限公司 | Extraction-rectification recovery method of N-methyl pyrrolidone in waste solvent |
| CN111892525A (en) * | 2020-05-08 | 2020-11-06 | 迈奇化学股份有限公司 | N-methyl pyrrolidone for liquid crystal panel and production process thereof |
| CN111978233A (en) * | 2020-09-15 | 2020-11-24 | 安徽英特力工业工程技术有限公司 | Device for improving purity of NMP crude product after methylamine removal |
Non-Patent Citations (1)
| Title |
|---|
| 付浩 等: ""电子级N-甲基吡咯烷酮制备及检测研究进展"", 《化学试剂》, vol. 39, no. 2, 28 February 2017 (2017-02-28), pages 157 - 160 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5791262B2 (en) | Method for producing high purity N-methyl-2-pyrrolidone | |
| CN108794371B (en) | A kind of refining methd of N-Methyl pyrrolidone product | |
| CN102485642B (en) | The production method of ultra-pure hydrogen phosphide | |
| CN113429329A (en) | Purification method of semiconductor grade N-methyl pyrrolidone | |
| CN116212431B (en) | Purification system and purification method of electronic grade octafluorocyclobutane | |
| CN111115579B (en) | Reactive ultrasonic rectification purification method for HCL electronic gas | |
| KR20180069284A (en) | METHOD FOR PURYFING WASTED SOLUTION COMPRISING N-methyl-2-pyrrolidone | |
| CN106349008A (en) | Method for purifying butadiene hexafluoride | |
| CN106277129B (en) | A kind of waste acid treatment method | |
| CN111413441B (en) | An improved method for purification of acetonitrile by ultra-high liquid chromatography-mass spectrometry | |
| CN109368668B (en) | Waste sulfuric acid treatment method | |
| CN116178238B (en) | A method for purifying electronic grade NMP | |
| CN115215824A (en) | Preparation method of 4,4' - (hexafluoroisopropenyl) diphthalic anhydride | |
| CN110127616B (en) | Purification process of ultrapure acid liquid | |
| CN113185441A (en) | Purification method for reducing chroma of N-methyl pyrrolidone | |
| CN114315641A (en) | Purification and recovery method of acetonitrile waste liquid | |
| US6955795B2 (en) | Method for producing lithium hexafluorophosphate | |
| KR102549766B1 (en) | Method for purifying waste ethanol | |
| CN113880058A (en) | Purification method of industrial-grade nitric acid | |
| CN110787638B (en) | Concentration system and concentration method of pentanediamine | |
| CN222841526U (en) | Device for reducing total amine content in NMP rectification | |
| KR101561281B1 (en) | Method for manufacturing of oxygen separator membrane using coal tar | |
| CN115196638B (en) | Silicon tetrachloride impurity removal method | |
| CN115232000B (en) | Method for refining pyromellitic acid | |
| KR101009026B1 (en) | A method for recovering acid from mixed waste acid generated in the liquid crystal display manufacturing process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210730 |