Monoethylene glycol (ethylene glycol)

Monoethylene glycol (ethylene glycol)

Monoethylene Glycol (MEG)  is a clear, colorless, oily, viscous, odorless liquid.  It is miscible with water in all proportions, with alcohols, aldehydes and other organic compounds. Ethylene Glycol (EG) does not dissolve rubber, cellulose acetate, heavy vegetable and petroleum oils. When mixed with water, MEG disrupts hydrogen bonding and therefore the freezing point of the mixture is lowered significantly. EG has is low volatile and quite hygroscopic. Toxic.

Molecular formula: 󘰎O2

No. CAS: 107-21-1

Abbreviation: MEG, EG

Items Value for Monoethyleneglycol
Appearance viscous, clear liquid
Monoethylene glycol content 99,1 %- 99,9 %
Density at 20癈 1,115 g/cm³
Viscosity at 20癈 20 cP
Boiling point of Ethyleneglycol at 760 mm Hg 197,1 癈
Ignition temperature of EG 112 癈
Freezing point of MEG at 760 mm Hg - 13 癈
Surface tension of Monoethyleneglycol at 25癈 48.0 mN/m
Water (by Karl-Fischer), max. 0,3 %
Acidity (CH3COOH), max. 0,002 %
Color, Platinum-Cobalt Units, of Ethylene glycol, max. 10 units
Ash content of ethylene glycol, max. 0,5 %

Application of Monoethylene glycol:

  • coolants, refrigerants, antifreezes;
  • heat transfer fluids;
  • production of polyester and polyethylene terephthalate (PET),
  • as a solvent and coalescent for water-based adhesives, latex paints and asphalt emulsions;
  • as a deicing fluid in aircraft;
  • as a dehydrating agent;
  • humectant for paper, textile, leather, adhesives, etc.;
  • ethylene glycol as a chemical intermediate for solvents;
  • stabilizer against gel formation;

Ethylene glycol freezing point dependance on EG concentration in water

MEG (EG) concentration, weight % Freezing point, 癈
0 0
10 - 4
20 - 7
30 - 15
40 - 23
50 - 34
60 - 48
70 - 51
80 - 45
90 - 29
100 - 13

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