Summary: Aliphatic hydrocarbons including resolved aliphatics (C11-C30), isoprenoids (phytane and pristane) and unresolved complex mixture, as well as total aromatic hydrocarbons were analyzed in 25 surface sediment samples represented five sites along Jeddah coast, Red Sea.
The concentration levels, spatial distributions of resolved aliphatics, total aromatic hydrocarbons in addition to unresolved complex mixture in surface sediment samples from Jeddah coast were detected.
Elution with n-hexane gave the total aliphatic (TAH) fraction (F1) while hexane-dichloromethane (10:90 v/v) yielded the branched aromatic hydrocarbons (F2) and elution with hexane-dichloromethane (50:50 v/v) yielded the aromatic hydrocarbon fraction (ArH) (F3) .
The pyrolysis gases are condensed in a two-stage condenser to give a low sulphur content distillate comprising straight and branched chain aliphatics
, cyclic aliphatics
and aromatic hydrocarbons which Cynar says is essentially equivalent to a petroleum distillate.
The column was then sequentially eluted under vacuum with pentane, benzene, ethyl acetate and methanol to produce aliphatics, aromatics, ester and polar fractions, respectively.
The pentane (1 and 2), benzene, ethyl acetate, and methanol eluents represent the fractions containing aliphatics, aromatics, hetero-atom containing (ester), and polar compounds, respectively.
Polyoil 110 is a nonpolar stereospecific, low viscosity, unsaponifiable liquid polybutadiene soluble in aliphatics
, aromatics and ethers.
* Cycloaliphatics--in between aromatics and aliphatics, usually require heat cure unless accelerated or specifically formulated.
* Aliphatic amines for fast cure at room temperature.
5 Adhesive Myth: Aliphatic
resins are better adhesives than regular PVA's.
We estimated the internal dose of HCs in fuels and solvents by measuring their levels in exhaled breath, including the sum of aliphatic HCs ([C.sub.6][H.sub.14]-[C.sub.16][H.sub.34]) and the sum of aromatic HCs (benzene, ethylbenzene, toluene, and m,p,o-xylenes).
The principal jet fuel used by the USAF, JP-8, is a mixture of petroleum distillates composed primarily of aliphatic and aromatic HCs in approximately a 6:1 ratio (Pleil et al.