| Outline | 1-Methyl-2-pyrrolidinone is abbreviated as NMP. Molecular formula: C5H9NO.Appearance is colorless to transparently pale yellow liquid, which is slight odor of ammonia, and can be miscible with water in any proportion, soluble in ether, acetone and esters, halogenated hydrocarbons, aromatic hydrocarbons and other organic solvents. It can be mixed with almost all the solvent, boiling point:204 ºC, flash point:91 ºC, moisture absorption strongly, chemical property stability, non-corrosive to carbon steel and aluminum, slightly corrosive to copper. Its advantages: Low viscosity, good chemical stability and thermal stability, high polarity, low volatility, miscible infinitely with water and many organic solvents. This product is a micro-drug. Allowable limit concentration is 100PPM in the air. |
| Reference quality indicators | Testing items Target
Appearance colorless transparent liquid (above 25 ºC)
Purity% ≥99.5
Moisture% ≤0.1
Chroma HaZen≤25
Refractive index N20D 1.468-1.471
Density 1.032-1.035 |
| Uses | 1-Methyl-2-pyrrolidinone is a polar aprotic transfer solvent. It has little toxicity, high boiling point, outstanding solvency, high selectivity and good stability. It is Widely used in purification of aromatics extraction, acetylene, olefin, diolefin, as solvent of polyvinylidene fluoride, lithium ion secondary battery electrode materials, in the synthesis gas desulfurization, refining lubricating oil, as lubricating antifreeze agent, an olefin extractant, solvent for polymerization of indissolvable plastic, agricultural herbicides, insulation materials, production of integrated circuits, precision instruments of semiconductor industry, in cleaning circuit boards, recycling the exhaust gas of PVC, cleaning agents, as dyes additives, dispersing agents, etc. It is also used as solvent for the polymer and medium for polymerization reactions, such as engineering plastics and aramid fibers. It may also be used in pesticides, pharmaceuticals and cleaning agent, etc.
1-Methyl-2-pyrrolidinone is an excellent extraction solvent, widely used as extracting agent for aromatic extraction, acetylene concentration, separation of butadiene and synthetic gas desulfurization process, etc, also as the solvent of pesticides, plastics, paints, production of synthetic, integrated circuits, etc. It can also be used for industrial detergents, dispersants, coloring agents, lubricants, antifreeze agent, etc. The product is low toxic and the rat oral LD50 is 7ml/kg.
The above information is edited by the chemicalbook of Yan Yanyong. |
| Chemical Properties | It is transparently colorless oily liquid, slight odor of amine . It can be miscible with water, alcohols, ethers, esters, ketones, halogenated hydrocarbons, aromatics. |
| Production methods | It is produced by the reaction of γ-butyrolactone with methylamine. The first step is that methylamine reacts with γ-butyrolactone to produce 4-hydroxy-N-methylbutanamide, and then the second step is further dehydration to produce 1-Methyl-2-pyrrolidinone. Two-step reaction can be conducted in a tubular reactor continuously, and the molar ratio of γ-butyrolactone to methylamine is 1: 1.15, pressure is about 6MPa and temperature is 250 ºC. After completion of the reaction, and then by concentration and vacuum distillation, product is derived. Yield is 90%. If the production is conducted in tank reactor, Dosage of methylamine is 1.5 to 2.5 times of the theoretical amount. For laboratory preparation, for example, 2 mols of γ-butyrolactone and 4 moles of liquid methylamine were added In 500ml autoclave vessel, heat sealed and held at 280 ºC for 4h. After cooling, the release of excess methylamine, distillation, collecting 201-202 ºC fraction, the product was about 180g, the yield of which was approximately 90%. Raw material consumption (kg/g) forγ-butyrolactone and methylamine (40%) were 980 and 860. |
| Category | Flammable liquid |
| Toxicity grading | poisoning |
| Acute toxicity | oral-rat LD50: 3914 mg/kg, Oral-Mouse LD50: 5130 mg/kg |
| Irritation data | Eye-rabbit moderate 100 mg |
| Flammability hazard characteristics | In case of fire, high temperature, strong oxidants, it is combustible. It is thermally decomposed to produce toxic nitric oxide gas. |
| Storage feature | complete package, wrapped and laid carefully, warehouse ventilation, away from open flame, heat, and stored separately from oxidants |
| Extinguishing agents | Foam, carbon dioxide, dry power, sandy soil |
| Chemical Properties | colourless or light yellow liquid with an amine odour |
| Usage | high purity grade for ICP-MS detection |
| Usage | It is a versatile industrial solvent. NMP is currently approved for use only in veterinary pharmaceuticals. The determination of the disposition and metabolism of NMP in the rat will contribute toward understanding the toxicology of this exogenous chemical which man may likely be exposed to in increasing amounts. |
| Definition | ChEBI: A member of the class of pyrrolidine-2-ones that is pyrrolidin-2-one in which the hydrogen attached to the nitrogen is replaced by a methyl group. |
| Professional standards | TWA 100 PPM (400 mg/cubic meter), STEL 100 mg/cubic meter |
| General Description | A clear colorless liquid with a "fishlike" odor. Denser than water. Flash point 199°F. Contact may irritate skin, eyes and mucous membranes. May be toxic by ingestion. |
| Air & Water Reactions | Soluble in water. |
| Reactivity Profile | This amine is a very mild chemical base. 1-Methyl-2-pyrrolidinone does tend to neutralize acids to form salts plus water. The amount of heat that is evolved per mole of amine in a neutralization is largely independent of the strength of the amine as a base. Amines may be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. Flammable gaseous hydrogen is generated by amines in combination with strong reducing agents, such as hydrides. |
| Health Hazard | Inhalation of hot vapors can irritate nose and throat. Ingestion causes irritation of mouth and stomach. Contact with eyes causes irritation. Repeated and prolonged skin contact produces a mild, transient irritation. |
| Fire Hazard | Special Hazards of Combustion Products: Toxic oxides of nitrogen may be formed in fire. |
