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How is N-Methylpyrrolidone Used


N-Methylpyrrolidone Properties:

N-Methylpyrrolidone is a colorless to light yellow transparent liquid, highly hygroscopic, miscible with most organic solvents such as water, ethanol, ether, acetone, ethyl acetate, chloroform and benzene. Chemically stable, but acid or alkali will rupture the lactam ring.


N-Methylpyrrolidone Applications:

NMP is used to recover certain hydrocarbons generated during the processing of petrochemicals, such as the recovery of 1,3-butadiene and acetylene. NMP can be used to absorb hydrogen sulfide from acid gases and hydrodesulfurization facilities. Its good solvency properties have led to NMP being used to dissolve various polymers. Specifically, NMP is used as a solvent for surface treatment of textiles, resins and metal-coated plastics, or as a paint stripper.

NMP is also used as a solvent for the commercial preparation of polyphenylene sulfide. In the pharmaceutical industry, N-methyl-2-pyrrolidone is used in drug formulations for oral and transdermal routes of administration. NMP is also used in large quantities in the manufacture of lithium-ion batteries as a solvent for electrode preparation, although efforts are being made to replace NMP with solvents of less environmental concern, such as water.

NMP Properties and Stability:

1、Colorless liquid with ammonia smell, the toxicity of this product is small. Can be miscible with water, soluble in most organic solvents such as ether and acetone. Can dissolve most organic and inorganic compounds, polar gases, natural and synthetic polymer compounds.
2、Chemical properties: NMP is stable in neutral solution. In 4% sodium hydroxide solution after 8 hours, 50% to 70% of hydrolysis occurs. Hydrolysis occurs gradually in concentrated hydrochloric acid to produce 4-methylaminobutyric acid. Due to the reaction of carbonyl group, 1-methyl-2-pyrrolidone can produce ketone or thio-pyrrolidone.
N-Methylpyrrolidone is weakly basic and can produce hydrochloride. 1-methyl-2-pyrrolidone forms adducts with heavy metal salts, for example, with nickel bromide heated to 150°C to produce NiBr2(C5H9ON)3 with a melting point of 105°C.

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