N-Methyl-2-pyrrolidone

N-Methyl-2-pyrrolidone
Names
IUPAC name
1-Methyl-2-pyrrolidone
Other names
N-Methylpyrrolidone; N-Methylpyrrolidinone; NMP; 1-Methyl-2-pyrrolidone; Pharmasolve
Identifiers
872-50-4 Yes
ChEBI CHEBI:7307 Yes
ChEMBL ChEMBL12543 Yes
ChemSpider 12814 Yes
Jmol-3D images Image
KEGG C11118 Yes
PubChem 13387
UNII JR9CE63FPM Yes
Properties
Molecular formula
 C5H9NO
Molar mass 99.13 g·mol−1
Density 1.028 g/cm3
Melting point −24 °C (−11 °F; 249 K)
Boiling point 202 °C (396 °F; 475 K)
Hazards
NFPA 704
Flammability code 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g., diesel fuel Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
2
2
1
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

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 and plastics industries as a solvent, exploiting its nonvolatility and ability to dissolve diverse materials.[1]

Preparation

NMP is produced industrially by a typical ester-to-amide conversion, by treating butyrolactone with methylamine. Alternative routes include the partial hydrogenation of N-methylsuccinimide and the reaction of acrylonitrile with methylamine followed by hydrolysis. About 20,000 to 30,000 tons are produced annually.[1]

Applications

NMP is used to recover certain hydrocarbons generated in the processing petrochemicals, such as the recovery of 1,3-butadiene and acetylene. It is used to absorb hydrogen sulfide from sour gas and hydrodesulfurization facilities. Due to its good solvency properties NMP is used to dissolve a wide range of polymers. It also used as a solvent for surface treatment of textiles, resins, and metal coated plastics or as a paint stripper. It is utilized as a solvent in the commercial preparation of polyphenylene sulfide. In the pharmaceutical industry, N-methyl-2-pyrrolidone is used in the formulation for drugs by both oral and transdermal delivery routes.[2]

Biological aspects

NMP is on the list of Chemicals Known to the State to Cause Cancer or Preproductive Toxicity cited in California Proposition 65 (1986).[3][1] In the face of increasing regulation, some manufacturers are considering alternative solvents for some applications, especially where worker exposure is difficult to control, such as in paint stripping, graffiti removal, and agriculture.[4]

On the other hand, NMP biodegrades readily and has low toxicity to aquatic life.[1]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 Albrecht Ludwig Harreus, R. Backes, J.-O. Eichler, R. Feuerhake, C. Jäkel, U. Mahn, R. Pinkos, R. Vogelsang"2-Pyrrolidone" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, 2011, Weinheim. doi:10.1002/14356007.a22_457.pub2
  2. ↑ "Pharmasolve® Drug Solubilizer" (PDF). PharmaGuide (International Specialty Products, a division of Ashland Inc.): Page 9. Retrieved 2012-06-06.
  3. ↑ "List of Chemicals as Known to the State of California to Cause Cancer or Reproductive Toxicity" (PDF). California OEHHA. Retrieved 4 December 2012.
  4. ↑ Reisch, Mark (July 21, 2008). "Solvent users look to replace NMP". Chemical & Engineering News: 32.