Triethylene glycol Triethylene glycol
Structural formula
| Business number | 035C |
|---|---|
| Molecular formula | C6H14O4 |
| Molecular weight | 150.17 |
| label |
Triethylene glycol (triethylene glycol): diethyl ether glycol, Ethylene glycol bis(β-hydroxyethyl ether), triethylene glycol ether, triethylene glycol, 2,2′-[1,2-Ethanediylbis(oxy)]bisethanol, Triglycol, Ethylene glycol bis-2-hydroxyethyl ether, 2,2′-Ethylenedioxybis(ethanol), air disinfectant, Tobacco anti-desiccant, fiber lubricants, natural gas desiccant, Aromatic hydrocarbon extraction agent, Disinfectants for air conditioning systems, alcohol solvent |
Numbering system
CAS number:112-27-6
MDL number:MFCD00002880
EINECS number:203-953-2
RTECS number:YE4550000
BRN number:969357
PubChem number:24890095
Physical property data
1. Properties: Colorless, odorless and hygroscopic viscous liquid.
2. Boiling point (ºC, 101.3kPa): 285
3. Melting point (freezing point) (ºC): -7
4. Relative density (g /mL, 15/4ºC): 1.1274
5. Relative density (g/mL, 20/4ºC): 1.1072
6. Relative vapor density (g/mL, air = 1): 5.2
7. Refractive index (n20D): 1.455
8. Refractive index (20ºC): 1.457815
9. Viscosity (mPa·s, 20ºC): 49.0
10. Viscosity (mPa·s , 60ºC): 8.5
11. Flash point (ºC, closed): 165
12. Flash point (ºC, open): 196
13. Ignition point (ºC): 371
14. Heat of evaporation (KJ/mol, b.p.): 71.452
15. Heat of combustion (KJ/mol): 3563.4
16. Specific heat capacity (KJ/(kg·K), 20ºC, constant pressure): 2.20
17. Conductivity (S/m, 20ºC): 8.4×10-8
18. Vapor pressure (kPa, 25ºC): 0.00018
19. Vapor pressure (kPa, 162ºC): 1.33
20. Vapor pressure (kPa ,198ºC): 6.67
21. Volume expansion coefficient (K-1,55ºC): 0.00071
22. Lower explosion limit (%, V/V ): 0.89
23. Explosion upper limit (%, V/V): 9.20
24. Solubility: miscible with water, alcohol, propanol, benzene, etc. In 100mL triethylene glycol, 40.6g carbon tetrachloride, 20.4g diethyl ether, 17.7g tetrachlorethylene and 33.0g toluene can be dissolved. In addition, triethylene glycol can still dissolve o-dichlorobenzene, phenol, nitrocellulose, cellulose acetate, dextrin, etc., but cannot dissolve petroleum ether, resin, and grease.
25. Relative density (25℃, 4℃): 1.124
26. Refractive index at room temperature (n25): 1.455720
27. Critical temperature (ºC): 506.85
28. Critical pressure (MPa): 3.30
29. Solubility parameter (J· cm-3)0.5: 27.184
30. van der Waals area (cm2·mol– 1): 1.220×1010
31. van der Waals volume (cm3·mol-1): 84.860
32. Gas phase standard combustion heat (enthalpy) (kJ·mol-1): -3636.8
33. Gas phase standard claim Heat (enthalpy) (kJ·mol-1): -725.0
34. Liquid phase standard combustion heat (enthalpy) (kJ·mol-1): -3557.6
35. Liquid phase standard claims heat (enthalpy) (kJ·mol-1): -804.2
36. Liquid phase Standard hot melt (J·mol-1·K-1): 350.0
Toxicological data
1. Acute toxicity: Rat oral LD50: 17000mg/kg; Guinea pig oral LD50: 7.9mL/kg
2. Slightly toxic, no irritation to eyes and skin, long-term exposure Can macerate the skin.
Ecological data
Slightly harmful to water bodies
Molecular structure data
1. Molar refractive index: 36.40
2. Molar volume (cm3/mol): 135.3
3. Isotonic specific volume (90.2K ): 343.6
4. Surface tension (dyne/cm): 41.6
5. Polarizability (10-24cm3): 14.43
Compute chemical data
1. Reference value for hydrophobic parameter calculation (XlogP): None
2. Number of hydrogen bond donors: 2
3. Number of hydrogen bond acceptors: 4
4. Number of rotatable chemical bonds: 7
5. Number of tautomers: none
6. Topological molecule polar surface area 58.9
7. Number of heavy atoms: 10
8. Surface charge: 0
9. Complexity: 49.7
10. Number of isotope atoms: 0
11. Determine the number of atomic stereocenters: 0
12. Uncertain number of atomic stereocenters: 0
13. Determine the number of chemical bond stereocenters: 0
14. Number of uncertain chemical bond stereocenters: 0
15. Number of covalent bond units: 1
Properties and stability
1. Avoid contact with oxides. Is a flammable substance. Non-corrosive to metals and non-corrosive to most plastics and rubbers. It has the chemical properties of alcohol and ether.
2.This product has low toxicity. The lower explosion limit in air is 3.2%. The maximum allowable concentration in the air is 10mg/m3≈1.5*10-6 (u/u), which is a low-toxic, flammable and explosive organic matter and should be placed in a ventilated, fireproof and rainproof place. During transportation, they should be handled and handled with care, avoid collisions, stay away from sources of fire, and operate in accordance with national regulations on the storage and transportation of hazardous chemicals. If this product leaks or contaminates the human body, flush it with plenty of water. Use clean water, foam, sand, etc. to extinguish the fire.
3. Exists in tobacco leaves and smoke.
Storage method
1. Store in a cool, ventilated warehouse. Keep away from fire and heat sources. They should be stored separately from oxidants, acids, etc., and avoid mixed storage. Equipped with the appropriate variety and quantity of fire equipment. The storage area should be equipped with emergency release equipment and suitable containment materials.
2. It is very easy to absorb moisture. It should be sealed in a dry and clean aluminum barrel or a large barrel with an inner wall sprayed with aluminum. It can also be packed in a galvanized sealed iron barrel. It is best to fill it with nitrogen during packaging. Protect. 200kg per barrel. The product should be stored in a dry, ventilated place, protected from moisture, fire, exposure, and away from fire and heat sources.
Synthesis method
1. Ethylene glycol is produced from the hydration of ethylene oxide, and the by-product triethylene glycol accounts for about 0.5%-1%.
Refining method: Generally refined by distillation. To obtain high-purity triethylene glycol, the commercially available product can be dehydrated with anhydrous sodium sulfate and distilled under reduced pressure three times. The middle fraction is collected and recrystallized twice.
Purpose
1. As a solvent, it is used in nitrocellulose, various resins, gums, rocket fuel, plasticizers and diesel additives. It can also be used in gas chromatography and organic synthesis. Triethylene glycol is mainly used as air dehumidifier solvent and aromatic hydrocarbon extraction agent. It is also used in printing inks, softeners, moisturizers and disinfectants in air conditioning systems.
2.Used as an excellent dehydrating agent for natural gas, oil field associated gas and carbon dioxide; an excellent organic solvent; an air disinfectant; polyvinyl chloride, polyvinyl chloride, Triethylene glycol lipid plasticizer for vinyl acetate resin, glass fiber and asbestos pressed boards, etc. It is also used in organic synthesis, such as the production of brake fluids with high boiling points and good low-temperature properties.
