What is N-methylpyrrolidone

What is N-methylpyrrolidone:
N-methylpyrrolidone (NMP) is an organic compound, colorless transparent oily liquid with a slight amine odor. Low volatility, good thermal stability, chemical stability, can be volatilized with water vapor. It is hygroscopic. Sensitive to light. Soluble in water, ethanol, ether, acetone, ethyl acetate, chloroform and benzene, it can dissolve most organic and inorganic compounds, polar gases, natural and synthetic polymers. N-methylpyrrolidone is widely used in lithium electricity, medicine, pesticides, pigments, cleaning agents, insulating materials and other industries.
1. Properties: Colorless transparent oily liquid, slightly amine odor.
2. Density: 1.028g/cm
3. Melting point: -24℃
4. Boiling point: 202℃
5. Refractive index: 1.470
6. Viscosity: 1.65mPa·s
7. Flash point: 86.1 ° C
8. Ignition point: 346℃
9. Combustion heat: 3010kJ/mol
10. Critical temperature: 445℃
11. Critical pressure: 4.76MPa
12. Conductivity: (1~2)×10-8s/m
13. Solubility: Easily soluble in water, ethanol, ether, acetone, ethyl acetate, chloroform and benzene, can be dissolved in most organic and inorganic compounds, polar gases, natural and synthetic polymer compounds.
Properties and stability:
1, colorless liquid, ammonia taste, this product is less toxic. It can be miscible with water and soluble in most organic solvents such as ether and acetone. It can dissolve most organic and inorganic compounds, polar gases, natural and synthetic polymer compounds.
2, chemical properties: relatively stable in neutral solution. In 4% sodium hydroxide solution, 50% to 70% hydrolysis occurs after 8 hours. It is gradually hydrolyzed in concentrated hydrochloric acid to form 4-methylaminobutyric acid. Due to the reaction of the carbonyl group, ketone or pyrrolidone can be formed.
3, in the presence of alkali catalyst and olefin, alkylation reaction occurs at the third position. N-methylpyrrolidone is weakly basic and can form hydrochloride. Adducts are formed with heavy metal salts, such as nickel bromide heated to 150 ° C to form NiBr2(C5H9ON)3 with a melting point of 105 ° C.

Purpose:
N-methylpyrrolidone is a polar aprotic transfer solvent with high boiling point, strong polarity, low viscosity, strong solubility, low toxicity, good biodegradability, low volatility, chemical stability and thermal stability, and it is widely used. Its main uses include:
1. Petrochemical: N-methylpyrrolidone is used for aromatics extraction, purification of acetylene, olefin and diolefin, as well as solvent and polymerization medium of polymers.
2. Plastics industry: N-methylpyrrolidone is used in polyamide, polyimide, polyphenylene sulfide and other engineering plastics and aramidan fiber production.
3. Pharmaceutical industry: N-methylpyrrolidone is used in the synthesis and preparation of drugs, including antiviral drugs (such as ribavirin) and anti-tumor drugs (such as paclitaxel).
4. Electronic materials: N-methylpyrrolidone is used as an important solvent in the electronic field of semiconductor, integrated circuit, liquid crystal display and other electronic device manufacturing, for electroplating, etching and cleaning processes.
5. Lithium battery manufacturing: N-methylpyrrolidone is also widely used in lithium battery manufacturing.
6. Pesticides and pigments: N-methylpyrrolidone is used in agricultural herbicides, pigments and insulating materials.
7. Cleaning agent: N-methylpyrrolidone is used as a thinner for advanced lubricating oil refining, paints, inks and adhesives, as well as a cleaner for electronic products.
8. PVC tail gas absorption: N-methylpyrrolidone is used to absorb vinyl chloride in PVC tail gas to reduce environmental pollution and resource waste.
9. In addition, N-methylpyrrolidone is used in research and analytical fields, such as as a mobile phase or electrolyte in liquid chromatography and electrophoresis experiments.
Industrial chain
Upstream: The upstream of the NMP industry chain mainly includes raw material manufacturers and production equipment manufacturers. The main raw materials of NMP are BDO(1, 4-butanediol), Y-butyrolactone, methylamine and other products.
Downstream: The downstream industry chain is the various application fields of NMP, mainly the new energy field represented by lithium batteries.
Product type
NMP is a special chemical product, according to metal impurities, control particle size, particle number and application range is divided into four grades, respectively, micro electrical grade, electronic grade, pharmaceutical grade and industrial grade.