Polymerizable ethylene

Characteristics
Under normal conditions, ethylene is a colourless, flammable gas of a sweetish odour, slightly lighter than air. It forms explosive mixtures with air over the range of concentrations given above. It is a biologically active compound, as a plant enzyme: in small concentrations ethylene accelerates the growth of plants and hastens ripening of fruits, but also stimulates the shedding of foliage and ageing of plants.

Ethylene of polymerisation quality is obtained at our Olefines Department II in the process of hydrocarbons pyrolysis. It is then extracted from the post-pyrolysis gas mixture through low-temperature distillation. 

Application
Ethylene is used for production of such chemicals as:

  • polyethylene and its co-polymers,
  • ethylene oxide and ethylene glycol,
  • vinyl chloride and PVC
  • tetrachloroethylene (used as solvent in "chemical" laundries).
  • tetrafluoroethylene (for production of Teflon).

Properties

Melting point –169.05 °C
Boiling point –103.68 °C
Critical temperature 9.26
Flash point n/a (gas)
Autoignition temperature 520 °C
Explosive limits 2.7 ÷ 34 % by volume
Density, gaseous form at 0 °C 1.26 g/dm3
liquid form at –103,7 °C 0.57 g/cm3
Gas pressure at 0 °C 4100 kPa
Relative gas density (air = 1) 0.97
Solubility in water at 25 °C 10 % by volume
Molar mass 28,054
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