Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
1-Methyl-2-pyrrolidinone
1. Basic Information
Name: 1-Methyl-2-pyrrolidinone
Alias: N-Methylpyrrolidone, NMP
CAS No.: 872-50-4
Molecular Formula: C?H?NO
Molecular Weight: 99.13
Category: High polar aprotic solvent, lithium battery slurry solvent, pharmaceutical synthesis solvent, polymer processing auxiliary, electronic cleaning agent
2. Physical and Chemical Properties
Physical Properties
- Appearance: Colorless transparent viscous oily liquid
- Odor: Faint mild amine odor, almost odorless at high purity
- Solubility: Miscible with water, alcohols, ketones, esters, ethers, aromatic hydrocarbons, halogenated solvents; excellent dissolving capacity for resins, polymers, inorganic salts
- Melting Point: ?24 ℃
- Boiling Point: 202–204 ℃
- Density (20℃): 1.027–1.030 g/cm3
- Refractive Index n?2?: 1.468–1.470
- Flash Point: 95 ℃
- Hygroscopy: Strongly hygroscopic, rapidly absorbs water vapor in air
- Aqueous property: Neutral to weakly alkaline aqueous solution, stable at pH 3–10; slow hydrolysis under strong acid/strong alkali heating
Chemical Properties
- Molecular structure: Five-membered cyclic lactam with N-methyl substitution, high dipole moment, strong electron-donating amide structure
- Polar dissolving performance: Aprotic solvent without active hydrogen, widely used in SN2 nucleophilic substitution, cross-coupling reactions, avoids side reactions caused by protic solvents
- Thermal stability: Stable below 180 ℃; high temperature above boiling point undergoes slight ring-opening decomposition
- Oxidation resistance: Stable under normal air; long-term heating with strong oxidants produces nitrogen oxide byproducts
- Compatibility: Compatible with most organic raw materials, polymer materials; incompatible with strong oxidants, concentrated strong acid, acid anhydrides, active metals
- Photostability: Slightly light-sensitive, long-term UV exposure turns pale yellow
3. Main Application Fields
1. Lithium Ion Battery Industry (Core Application)
Slurry solvent for cathode/anode active materials, dissolves PVDF binder; essential solvent for power battery production
2. Pharmaceutical Fine Chemicals
High-boiling reaction solvent for peptide, heterocyclic, API synthesis; improves reaction conversion rate for difficult solute substrates
3. Electronic & Circuit Manufacturing
Cleaning solvent for semiconductor wafers, PCB circuit boards; removes photoresist, resin residue
4. Polymer & Plastic Industry
Auxiliary solvent for aramid, polyimide, PEEK high-performance polymer spinning and film forming
5. Petrochemical & Extractant
Aromatic hydrocarbon separation extractant, lubricant refining solvent
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 872-50-4 |
| Molecular Formula | C?H?NO |
| Appearance | Colorless clear viscous liquid without suspended impurities |
| GC Purity | Electronic Grade ≥99.9%, Pharma Grade ≥99.5%, Industrial Grade ≥99.0% |
| Water Content (KF) | Electronic Grade ≤100 ppm, General Grade ≤0.10% |
| Chroma (APHA) | ≤20 |
| Amine Value | ≤0.05 mgKOH/g |
| Heavy Metals (Pb) | ≤1 ppm (electronic grade) / ≤10 ppm (industrial grade) |
| Packaging | 1L/5L amber plastic bottle, 200kg galvanized iron drum, IBC ton barrel |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 ℃, light shielding, isolate humid air, strong oxidants and acids |
| Transportation Requirement | Hygroscopic high-boiling organic solvent, sealed packaging, belongs to general organic liquid hazardous goods |
| Shelf Life | 24 months under nitrogen sealed storage |
Safety Warning
Moderate irritant lactam solvent. Vapor irritates eyes, respiratory tract; skin penetration is strong, long-term contact causes dryness, dermatitis; pregnant women need strict avoidance. All operations must be carried out in ventilated fume hood with chemical-resistant nitrile gloves, splash-proof goggles. Avoid mixing with strong oxidants to prevent exothermic oxidation. Waste liquid recycled via solvent distillation; residual liquid classified as organic hazardous waste for professional disposal.
