Ethyl Pyrrolidone, N-Ethylpyrrolidone, NEP, N-Ethyl-2-pyrrolidinone, DDR1, 2687-91-4

Ethyl Pyrrolidone, N-Ethylpyrrolidone, NEP, N-Ethyl-2-pyrrolidinone, DDR1, 2687-91-4

1-Ethyl-2-pyrrolidone (CAS 2687-91-4) in English, following your detailed format:

🌟 1-Ethyl-2-pyrrolidone (NEP)

A) Physical and Chemical Properties

• Chemical Formula: C₆H₁₁NO

• Molecular Weight: 113.16 g/mol

• Appearance: Clear, colorless liquid

• Melting Point: 87.5–88.5 °C

• Boiling Point: 97 °C @ 20 mmHg

• Density: 0.992 g/mL (25 °C)

• Solubility: Fully miscible with water (~1000 g/L @ 23 °C)

• pH (100 g/L in water): 8–9

• Flash Point: 91 °C (Pensky-Martens Closed Cup)

• Explosion Limits: 1.3%–7.7% (v/v)

• Refractive Index: n₂₀/D 1.465

• Vapor Pressure: 18 Pa @ 20 °C

• Storage Conditions: Store in sealed containers in a cool, dry place

• Water Hazard Classification (WGK Germany): 1 (low hazard)

• EC No: 220-250-6

• UNSPSC Code: 12352203

B) Applications

• Solvent: For electronics, pharmaceutical, and polymer sectors due to low volatility

• Intermediate: In the production of polycarboxylic acids

• Surface Modification: For UV-curable fiber processing

• Transdermal Systems: Enhancer for skin permeability

• Coatings & Inks: Used in inkjet formulations and coating binders

C) Manufacturing Method

• Main Route: N-alkylation of 2-Pyrrolidone with ethyl halides

• Reactants: 2-Pyrrolidone + Ethyl bromide/chloride

• Catalyst/Medium: Basic conditions (e.g., NaOH)

• Purity: ≥98% (confirmed by GC analysis)

D) Chemical Reactions

• N-Alkylation: Used to synthesize NEP, NMP, and other derivatives

• Photo-curing: Surface treatment via polymer crosslinking

• Solvation: Effective for both polar and non-polar compounds

E) Alternatives

• N-Methyl-2-pyrrolidone (NMP): Higher boiling point

• 2-Methyltetrahydrofuran (2-MeTHF): Bio-based option

• Dimethylformamide (DMF): Similar polarity

• 2-Pyrrolidone: NEP’s precursor compound

F) Synonyms 1-Ethyl-2-pyrrolidone, N-Ethylpyrrolidone, NEP, N-Ethyl-2-pyrrolidinone, DDR1

G) Common Names “NEP solvent” “Ethyl pyrrolidone” “Low-volatility aprotic solvent”

H) Usage Ratios

• Polymer Modification: Typically 5–30%

• Pharmaceutical Synthesis: 10–50% of reaction volume

• Coating Systems: 5–15% as carrier solvent