2-Butanone 2-Butanone

Structural formula

• Numbering system
• Physical property data
• Toxicological data
• Ecological data
• Molecular structure data
• Computing chemical data
• More
  • Properties and Stability
  • Storage method
  • Synthesis method
  • Purpose

Numbering system

CAS number:78-93-3

MDL number:MFCD00011648

EINECS number:201-159-0

RTECS number:EL6475000

BRN number:741880

PubChem number:24872423

Physical property data

1. Properties: Colorless liquid with an odor similar to acetone. ^[1]

2. Melting point (℃): -85.9^[2]

3. Boiling point (℃): 79.6^[3]

4. Relative density (water = 1): 0.81^[4]

5. Relative vapor Density (air=1): 2.42^[5]

6. Saturated vapor pressure (kPa): 10.5 (20℃)^[6]

7. Heat of combustion (kJ/mol): -2261.7^[7]

8. Critical temperature (℃): 262.5^[8]

9. Critical pressure (MPa): 4.15^[9]

10. Octanol/water partition coefficient: 0.29 ^[10]

11. Flash point (℃): -9 (CC) ^[11]

12. Ignition temperature ( ℃): 404^[12]

13. Explosion upper limit (%): 11.5^[13]

14. Explosion Lower limit (%): 1.8^[14]

15. Solubility: soluble in water, ethanol, ether, acetone, benzene, miscible in oils. ^[15]

16. Relative density (g/mL, 20/4ºC): 0.8049

17. Relative density (g/mL, 25/ 4ºC): 0.7997

18. Refractive index (n20ºC): 1.3788

19. Refractive index (n25ºC): 1.3764

20. Viscosity (mPa·s , 25ºC): 0.423

21. Viscosity (mPa·s, 30ºC): 0.365

22. Flash point (ºC, closed): -7.2

23. Flash point (ºC, open): 1.67

24. Fire point (ºC): 516

25. Heat of vaporization (J/mol, b.p.): 23.3

26. Heat of fusion (KJ/mol): 8.4

27. Heat of formation (KJ/mol): 279.2

28. Specific heat capacity (KJ/(kg·K) , constant pressure): 2.297

29. Conductivity (S/m): 3.6×10^-9

30. Volume expansion coefficient (K^-1, 0~80ºC): 0.00142

31. Body expansion coefficient (K^-1, 0~30ºC): 0.00129

32. Critical density (g/mL): 0.270

33. Critical volume (cm³·mol^-1): 267 p>

34. Critical compression factor: 0.252

35. Eccentricity factor: 0.324

36. Lennard-Jones parameter (A): 14.49

37. Lennard-Jones parameter (K): 145.9

38. Solubility parameter (J·cm^-3)^0.5: 18.796

39. van der Waals area (cm²·mol^-1): 7.910×10⁹

40.van der Waals volume (cm³·mol^-1): 49.270</pBy adjusting the distillation column and reflux ratio, pure butanone with different contents can be obtained.

8.Esterification method is mainly used. Using the mixed C 4 fraction containing butene as raw material, it undergoes esterification reaction with sulfuric acid to generate acidic sulfate ester and neutral sulfate ester, which are then diluted with water and hydrolyzed to generate a sec-butanol aqueous solution, which is then dehydrated and concentrated to obtain sec-butanol. , and finally after catalytic deoxidation, the finished productreaction is as follows:

;”>C 4H8+H2S O 4→ 4C 3H9HS O 4→ OC 3H9OH+H2S O 4
C 4H9OH -H2→ CH3C O C 2H5

Purpose

1. Methyl ketone is mainly used as a solvent, such as in lubricating oil dewaxing, coating industry and azeotropic distillation of various resin solvents, vegetable oil extraction processes and refining processes. Its advantages are strong solubility and volatility. Lower than acetone, it is a medium boiling point ketone solvent.

2. Methyl ketone is also an intermediate in the preparation of medicines, dyes, detergents, spices, antioxidants and certain catalysts. It can synthesize anti-peeling agent methyl ethyl ketoxime and polymerization catalyst methyl ethyl. Ketone peroxide, corrosion inhibitor methylpentynol, etc. are used in the electronics industry as developers after photolithography of integrated circuits.

3. Used as detergent, lubricating oil dewaxing agent, vulcanization accelerator and reaction intermediate, etc.

4. Used in organic synthesis. Used as standard material and solvent for chromatographic analysis.

5. Used in the electronics industry, often used as cleaning and degreasing agents.

6. In addition to being widely used in oil refining, coatings, additives, adhesives, dyes, medicine and electronic component cleaning, it is mainly used in nitrocellulose, vinyl resin, acrylic resin and other Solvent for synthetic resins. Its advantages are strong solubility and lower volatility than acetone. It is also used in the extraction of vegetable oils, azeotropic distillation in the refining process, and the preparation of spices and antioxidants.

7. It is a raw material for organic synthesis and can be used as a solvent. It is used as a dewaxing agent for lubricants in the oil refining industry and is also used in medicine, coatings, dyes, detergents, spices and electronics industries. Solvent for liquid ink. It is used in the manufacture of nail polish in cosmetics. As a low boiling point solvent, it can reduce the viscosity of nail polish and has quick drying properties.

8. Used as solvent, dewaxing agent, organic synthesis, and raw material for synthetic fragrances and medicines. ^[29]