unsaturated hydrocarbon


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

unsaturated hydrocarbon

[¦ən′sach·ə‚rād·əd ¦hī·drə′kär·bən]
(organic chemistry)
One of a class of hydrocarbons that have at least one double or triple carbon-to-carbon bond that is not in an aromatic ring; examples are ethylene, propadiene, and acetylene.
References in periodicals archive ?
In these processes, the hydrogenation of high molecular weight unsaturated hydrocarbons contained in the saturated oils to their saturated counterparts is of significant importance.
Studies, therefore, on the hydrogenation of unsaturated hydrocarbons obtained after pyrolysis of waste polymers to their saturated counterparts as potential blending material or additives to fuel are justified.
Raman spectroscopy is also highly sensitive to the unsaturated hydrocarbons in the fuel.
The results showed that shale oils contained a considerable amount of heteroatomic compounds and unsaturated hydrocarbons. The catalyst NiMoW/[Al.sub.2][O.sub.3] showed the most activity for removal of sulfur and nitrogen.
The authors (Weber State University) describe chemical reactions, solutions and colloids, acids and bases, alkanes, unsaturated hydrocarbons, aldehydes, carbohydrates, proteins, enzymes, and amino acid metabolism.
It contained roughly 35% alkanes (mainly normal), 56% unsaturated hydrocarbons (mainly 1-alkenes), 4% naftenes and 4% aromatics.
The content of unsaturated hydrocarbons [C.sub.2]-[C.sub.4] is extremely low (0.9-1.3 vol.%) in all cases except ethanol (6.5 vol.%).
The products obtained by thermal decomposition of kukersite oil shale in the retorts with solid heat carrier are notable for their high content of unsaturated hydrocarbons.
About Thermal Low-Temperature Processing of Oil Shale by Solid Heat Carrier Method 199 The light oil fraction (up to 150 [degrees]C) rectified from the total oil contains a notable quantity (41-44%) unsaturated hydrocarbons. In the oil fraction 150-200 [degrees]C the content of alkenes decreases to the level of 27-28%, at the same time the degree of aromatization increases to 24-29%.
These oils should be first upgraded by treating with hydrogen to remove sulphur, nitrogen and oxygen and to saturate the unsaturated hydrocarbons. If upgrading is not used, it is difficult to find a commercial market for fractions boiling below 200 [degrees]C.