asphaltene

[as-fawl-teen or, esp. British, -fal-]
noun Chemistry.
any of the constituents of a bitumen, as asphalt, that are insoluble in pentane, hexane, or naphthalene.
Compare petrolene.


Origin:
1830–40; asphalt + -ene

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Example sentences
Asphaltene fraction are easily caused the coke formation during the thermal
  cracking.
The solid precipitated this way is called asphaltene.
The asphaltene contents in three reaction systems are changed in the similar
  tendency with cracked residue proportions.
The spilled oil is a waxy, light condensate crude with almost no asphaltene
  content.
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