Studies so far have shown that fuel oxidation products, hydroperoxides and alkylperoxy radicals are primarily responsible for the formation of insoluble deposits from diesel and other middle distillates [1, 2].
The presence of the oxygenated straight chain compounds is attributed to the intermediate products formed from the free radical mechanisms leading to the thermal oxidative degradation of middle distillates [1, 4].
Two aromatics-rich distillates R1 and R2 with different properties are derived from naphthenic vacuum gas oil.
Two aromatics-rich distillates R1 and R2 with different properties from naphthenic base vacuum gas oil were used for preparing mesophase pitch through high-pressure thermal treatment.
In recent years, electrospray ionization (ESI) coupled with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) has been widely applied for characterizing nitrogen compounds in crude oil and its distillates [11, 12, 13, 14, 15], oil bitumen sands [16], and shale oils [17, 18].
In this work, two batches of aromatics-rich distillates R1 and R2 with different properties were derived from naphthenic base vacuum gas oil by furfural extraction, then mesophase pitches were prepared by thermal treatment using R1 and R2 as raw materials, respectively, namely R1-MP and R2-MP.
Reported desulfurization yields are 30 70% from middle distillates, 40 90% from diesel fuels, 65 70% from hydrotreated diesel, 20 60% from light gas oil, 75 90% from cracked stocks, and 20 60% from crude oil (Kaufman et al. 1998; Shong 1999; Atlas et al. 1998; Monticello 1998).
Hydrodynamic experiments were carried out for the systems palm fatty acids distillates + CO2 at 333, 353, and 373 K and pressures between 20 and 29 MPa in order to compute the column hydraulic capacity.
Water coral fleece wick with wire-mesh stepped absorber plate gave maximum distillate (4.28 l/day).
During adaptation periods, all cows received a supplement of palm fatty acid distillate (242 g/d).
Matricine is converted upon steam distillation or exposure to heat into chamazulene, a sesquiterpene responsible for the blue colour of the distillate [2, 36].
