indane
A bicyclic hydrocarbon consisting of a benzene ring fused to that of cyclopentane; it, and its derivatives, are found in petroleum
indane: a two-ring hydrocarbon locked in crude oil
Indane is a bicyclic aromatic hydrocarbon with a molecular formula of C9H10. Its structure consists of a benzene ring fused to a cyclopentane ring, creating a rigid two-ring system. In the petroleum industry, indane matters because it occurs naturally in crude oil fractions and affects both the chemical and physical properties of refined products.
Indane concentrations vary by crude source but typically appear in the middle distillate range, particularly in kerosene and diesel fractions boiling between 160 and 250 degrees Celsius. The compound is colorless to pale yellow and carries a characteristic aromatic odor. Its presence in fuel streams influences cetane number, viscosity, and thermal stability, making it relevant to refiners managing product specifications.
Detection and extraction routes
Indane is isolated and identified through gas chromatography mass spectrometry (GC-MS) during crude oil analysis and product quality testing. Because it remains in solution during standard refining operations rather than separating cleanly, extraction typically requires solvent treatment or hydrogenation. Indane derivatives, particularly methylated forms like tetralin (tetrahydronaphthalene), are more commonly concentrated from petroleum than pure indane itself.
The compound's name derives from its structure: a contraction of indene plus the suffix indicating full saturation at one ring position. Indene, its unsaturated parent, also occurs in crude but is less stable. Both compounds fall into the broader category of polycyclic aromatics that refiners must monitor and sometimes control, particularly when they affect product specifications or environmental compliance.
In processing operations, indane-rich streams behave predictably under hydrotreating catalysts but can participate in polymerization reactions at elevated temperatures if not stabilized. Its presence is tracked in quality assurance labs where simulated distillation (ASTM D2887) and detailed hydrocarbon analysis (HPLC or supercritical fluid chromatography) routinely quantify aromatic families including the indane class.