Dimethylsulfoxide physical and chemical properties

Density 1.1±0.1 g/cm3

Boiling point 189.0±9.0 °C at 760 mmHg

Melting point 18.4 °C

Molecular formula C2H6OS

Molecular weight 78.13

Flash point 85.0±0.0 °C

Precise mass 78.013931

PSA 36.28000

LogP -1.35

Appearance Colorless liquid

Vapor density 2.7 (vs air)

Vapor pressure 0.8±0.3 mmHg at 25°C

Refractive index 1.480

Storage conditions

1. The product should be sealed in a cool and dry place and stored away from light.

2. This product is packed in aluminum barrel, plastic barrel or glass bottle. Store in a cool, ventilated and dry place, and store and transport according to the regulations of flammable and toxic substances.

Stability

1. Colorless liquid, flammable, almost odorless, with bitter taste. It is a high polarity organic solvent, can be mixed with water in any ratio, except petroleum ether, can dissolve general organic solvents. It can absorb hydrogen chloride 30% (wt); nitrogen dioxide 30% (wt); sulfur dioxide 65% (wt) at 20℃. It has strong hygroscopicity and can absorb moisture equivalent to 70% of its own weight from air at 20℃ when the relative humidity is 60%. The product is a weak oxidizer, dimethyl sulfoxide without water is not corrosive to metals. When containing water, it is corrosive to iron; copper and other metals, but not to aluminum. Stable to bases. When heated in the presence of acid, a small amount of methyl mercaptan; formaldehyde; dimethyl sulfide; methanesulfonic acid and other compounds are produced. It decomposes at high temperature and reacts violently with chlorine, and burns in air with a light blue flame.

Chemical properties: Dimethyl sulfoxide reduction to produce methyl sulfide. Oxidized to dimethyl sulfoxide by the action of strong oxidizing agents.

2. Dimethyl sulfoxide reacts with chlorinated substances such as cyanuric chloride, benzoyl chloride, acetyl chloride, phenyl iodide chloride, thionyl chloride, thionyl chloride, phosphorus trichloride, etc. when contacted, a violent exothermic decomposition reaction occurs. Combined with nitric acid, it produces (CH3)2SO-NHO3. interaction with barium carbonate regenerates dimethyl sulfoxide. With concentrated hydroiodic acid to produce dimethyl sulfoxide compounds.

3. Dimethyl sulfoxide is absorbent and needs to be dried before use.

Freezing point 18.4℃

Molecular structure

1. Molar refractive index: 20.17

2、 Molar volume (cm3/mol): 71.0

3、 Isotropic specific volume (90.2K): 182.6

4、 Surface tension (dyne/cm): 43.6

5、 Polarization rate (10-24cm3): 7.99

Calculation chemistry

1. Calculated reference value of hydrophobic parameter (XlogP):-0.6

2. Number of hydrogen bond donor:0

3. Number of hydrogen bond acceptors:2

4. Number of rotatable bonds:0

5. Number of reciprocal isomers:none

6. Polar surface area of topological molecules:36.3

7.Number of heavy atoms:4

8. Surface charge:0

9.Complexity:29

10.Number of isotope atoms:0

11. Number of determined atomic structure centers: 0

12.Number of uncertain atomic structure centers:0

13.Number of definite bonding centers:0

14.Number of indeterminate bonding centers:0

15.Number of covalent bonding units:1

more

1. Properties: Colorless viscous and transparent oily liquid or crystals. Weakly alkaline, almost odorless, slightly bitter.

2. Density (g/mL,20/4℃):1.100

3. Relative vapor density (g/mL, air=1): 2.7

4. melting point (ºC): 18.45

5. boiling point (ºC, atmospheric pressure): 189

6. Refractive index (25ºC): 1.4795

7. Viscosity (mPa-s,25ºC): 1.1

8. Flash point (ºC, open): 95

9. ignition point (ºC): 300~302

10. heat of evaporation (KJ/mol,25ºC): 52.92

11. heat of melting (KJ/mol): 13.94

12. Heat of generation (KJ/mol): -197.66

13. heat of combustion (KJ/mol, constant volume): 1793.16

14. specific heat capacity (KJ/(kg-K), 25ºC, constant pressure): 1.95

15. electrical conductivity (S/m,20ºC): 3×10-8

16. Vapor pressure (kPa,20ºC): 0.049

17. Vapor pressure (kPa,30ºC): 0.101

18. Vapor pressure (kPa,47.4ºC): 0.376

19. Vapor pressure (kPa,56.6ºC): 0.681

20. lower explosion limit (%,V/V): 2.6

21. upper explosion limit (%,V/V): 28.5

22. body expansion coefficient (K-1): 0.00088

23. solubility: can be mixed with water in any ratio, except petroleum ether, can dissolve general organic solvents. It can absorb 30% by weight of hydrogen chloride, 30% by weight of nitrogen dioxide and 65% by weight of sulfur dioxide at 20°C. It is insoluble in aliphatic hydrocarbon compounds other than acetylene. Soluble in many compounds. Soluble in water, ethylene glycol, acetone, ether, benzene, chlorinated hydrocarbons, esters of ethylene glycol, etc.