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aliphatic compound

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aliphatic compound

Any organic chemical compound in which the carbon atoms are joined in straight chains, as in hexane (C6H14), or in branched chains, as in 2-methylpentane (CH3CH(CH3)CH2CH2CH 3).

Aliphatic compounds have bonding electrons localized within the vicinity of the bonded atoms. Cyclic compounds that do not have delocalized electrons are also aliphatic, as in the alicyclic compound cyclohexane (C6H12) or the heterocyclic piperidine (C5H11N). Compare aromatic compound.

Among the principal aliphatic compounds are the alkanes (paraffins), which include methane, ethane, pentane, petrol, kerosene, lubricating oil, and paraffin wax; the alkenes (olefins), including ethene (C2H4); the ethynes (for example, acetylene C2H2); the alcohols, ethers, ethanoic and other acids, esters (for example ethyl acetate), certain classes of amines, the carbohydrates, such as starch, sugar and cellulose; and the fats.
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So, kerogen should include unstable formations, possible aliphatic compounds, which transform to more stable structures emitting equal quantity of water which does not depend on pyrolysis atmosphere.
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For instance, polar fractions high in quinones were much more potent in inducing cell death, whereas aromatic compounds high in PAHs had a more moderate effect, and aliphatic compounds had no apparent effect.
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It is not possible (according to the available knowledge) to eliminate the formation of PAH in the obtained oil without elimination or decreasing the aromatization processes via secondary reactions through either a Diels-Alder type reaction or selective cracking of aliphatic compounds resulting in selective concentration of aromatic compounds.
The presence of polycyclic aromatic hydrocarbons (PAH) in oil ... by Nazzal, J.M. / Oil Shale
 
 
 
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