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Physical and chemical properties of N-methylpyrrolidone (NMP)

The density of 1.0 + / - 0.1 g/cm3

Boiling point 202.0±0.0 °C at 760 mmHg

Melting point - 24 ° C (lit.)

Molecular formula C5H9NO

The molecular weight of 99.131

Flash point 86.1 + / - 0.0 ° C

Exact mass 99.068413

PSA 20.31000

LogP - 0.40 -

Appearance Properties Colorless or yellowish liquid with an amine odor

Steam density 3.4 (VS AIR)

Vapor pressure 0.3±0.4 mmHg at 25°C

The refractive index of 1.470

Storage conditions

Store under dry, inert gas, keep container airtight, and store in a cool, dry place.

The stability of

1. Colorless liquid, ammonia taste, low toxicity. Can be miscible with water, soluble in ether, acetone and other most organic solvents. Can dissolve most organic and inorganic compounds, polar gases, natural and synthetic polymer compounds.

2. Chemical properties: relatively stable in neutral solution. Hydrolysis of 50%~70% occurred after 8 hours in 4% sodium hydroxide solution. Hydrolyzed gradually in concentrated hydrochloric acid to produce 4-aminobutyric acid CH3NH(CH2)3COOH. Ketol or thiopyrrolidone may be formed due to the carbonyl reaction.

3. In the presence of base catalyst and alkene, alkylation reaction occurs in the third position. N-methylpyrrolidone is weakly basic and can form hydrochloride. Adducts are formed with heavy metal salts, for example by heating with nickel bromide to 150 ° C to form NiBr2(C5H9ON)3 with a melting point of 105 ° C.

Water solubility >=10 g/100 mL AT 20 oC

The molecular structure

1. Molar refractive index: 26.85

2, molar volume (CM3 /mol) : 96.2

3, isotonic ratio (90.2K) : 232.1

4, surface tension (Dyne /cm) : 33.7

5, polarization (10-24cm3) : 10.64