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Physical properties:

1. Appearance: Colorless, odorless, viscous liquid with a sweet taste.

2. Boiling point: 290℃ at 760mmHg

3. Melting point: 18.17℃

4. Relative density (20ºC): 1.2613

5. Relative density (25ºC): 1.2551

6. Refractive index (15ºC): 1.47547

7. Refractive index (20ºC): 1.4746

8. Refractive index (25ºC): 1.4730

9. Viscosity (20ºC): 1500 mPa·s

10. Viscosity (25ºC): 800 mPa·s

11. Viscosity (30ºC): 600 mPa·s

12. Viscosity (50ºC): 150 mPa·s

13. Flash point: 177℃ (open cup)

14. Heat of formation (15ºC): 669.05 KJ/mol

15. Heat of combustion (25ºC): 1656.42 KJ/mol

16. Specific heat capacity (15ºC): 2.46 KJ/(kg·K)

17. Electrical conductivity (20ºC): 1.0 × 10⁻⁸ S/m

18. Thermal conductivity: 0.29 W/(m·K)

19. Vapor pressure (125.5ºC): 0.13 kPa

20. Coefficient of volume expansion: 0.000615 K

21. Solubility: Absorbs hydrogen sulfide, hydrocyanic acid, and sulfur dioxide. Miscible with water and ethanol; 1 part is soluble in 11 parts ethyl acetate and approximately 500 parts diethyl ether; insoluble in benzene, carbon disulfide, chloroform, carbon tetrachloride, petroleum ether, chloroform, and oils.

22. Critical Temperature: 576.85 ℃

23. Critical Pressure: 7.5 MPa

24. Eccentricity Factor: 1.320

25. Solubility Parameter: 34.315 J·cm

26. van der Waals Area: 7.650×10¹⁰ cm²/mol

27. van der Waals Volume: 51.360 cm³/mol

Applications

Gas chromatography stationary phase (maximum operating temperature 75℃, solvent: methanol), used for the separation and analysis of low-boiling-point oxygen-containing compounds, amines, and nitrogen or oxygen heterocyclic compounds. It can completely separate 3-methylpyridine (boiling point 144.14℃) and 4-methylpyridine (boiling point 145.36℃). Suitable for aqueous solution analysis, solvents, gas flow meters and hydraulic press damping fluids, softeners, nutrients for antibiotic fermentation, desiccants, lubricants, pharmaceutical industry, cosmetic formulation, organic synthesis, and plasticizers. It can be dissolved in water in any proportion, and low-concentration glycerol solutions can be used as lubricants to moisturize the skin.