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Chemical compound From Wikipedia, the free encyclopedia
N-Methyl-2-pyrrolidone (NMP) is an organic compound consisting of a 5-membered lactam. It is a colorless liquid, although impure samples can appear yellow. It is miscible with water and with most common organic solvents. It also belongs to the class of dipolar aprotic solvents such as dimethylformamide and dimethyl sulfoxide. It is used in the petrochemical, polymer and battery industries as a solvent, exploiting its nonvolatility and ability to dissolve diverse materials (including polyvinylidene difluoride, PVDF).[3] The low toxicity is also a reason to use this solvent.
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| Names | |||
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| Preferred IUPAC name
1-Methylpyrrolidin-2-one | |||
| Other names
1-Methyl-2-pyrrolidone N-Methylpyrrolidone N-Methylpyrrolidinone Pharmasolve | |||
| Identifiers | |||
3D model (JSmol) |
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| ChEBI | |||
| ChEMBL | |||
| ChemSpider | |||
| ECHA InfoCard | 100.011.662 | ||
| KEGG | |||
PubChem CID |
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| UNII | |||
CompTox Dashboard (EPA) |
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| Properties | |||
| C5H9NO | |||
| Molar mass | 99.133 g·mol−1 | ||
| Density | 1.028 g/cm3 | ||
| Melting point | −24 °C (−11 °F; 249 K) | ||
| Boiling point | 202 to 204 °C (396 to 399 °F; 475 to 477 K) | ||
| Soluble[1] | |||
| Solubility in Ethanol, acetone, diethylether, ethyl acetate, chloroform, benzene | Soluble[1] | ||
| log P | −0.40[2] | ||
| Hazards | |||
| NFPA 704 (fire diamond) | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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NMP is produced industrially by a typical ester-to-amide conversion, by treating gamma-butyrolactone with methylamine. Alternative routes include the partial hydrogenation of N-methylsuccinimide and the reaction of acrylonitrile with methylamine followed by hydrolysis. About 200,000 to 250,000 tons are produced annually.[3]
NMP is used to recover certain hydrocarbons generated in the processing of petrochemicals, such as the recovery of 1,3-butadiene and acetylene. It is used to absorb hydrogen sulfide from sour gas and hydrodesulfurization facilities. Its good solvency properties have led to NMP's use to dissolve a wide range of polymers. Specifically, it is used as a solvent for surface treatment of textiles, resins, and metal coated plastics or as a paint stripper. It is also used as a solvent in the commercial preparation of polyphenylene sulfide. NMP is used in the production of aramid fibers Twaron and Kevlar. In the pharmaceutical industry, N-methyl-2-pyrrolidone is used in the formulation for drugs by both oral and transdermal delivery routes.[4] It is also used heavily in lithium ion battery fabrication, as a solvent for electrode preparation, because NMP has a unique ability to dissolve polyvinylidene fluoride binder.
N-Methyl-2-pyrrolidone (NMP) is classified as a reproductive toxicant (H360D: May damage the unborn child) and can cause skin and eye irritation and respiratory irritation (H315, H319, H335).[5] Studies show NMP exposure can increase the risk of developmental toxicity, including miscarriage and fetal death.[6] Good ventilation and PPE are recommended for safe handling.[7]
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