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EC number: 232-490-9
CAS number: 8052-42-4
A very complex combination of high molecular weight organic compounds containing a relatively high proportion of hydrocarbons having carbon numbers predominantly greater than C25 with high carbon-to-hydrogen ratios. It also contains small amounts of various metals such as nickel, iron, or vanadium. It is obtained as the non-volatile residue from distillation of crude oil or by separation as the raffinate from a residual oil in a deasphalting or decarbonization process.
<< 0.1 kPa at 20°C
For complex substances the vapour pressure is the sum of the partial pressure of the individual constituents (Raoult’s Law). Based on the molecular weight, viscosity and boiling point, bitumens are expected to have low vapour pressures (<< 0.1 kPa at 20°C) at ambient temperature (CONCAWE, 1992a).
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