Distribution of aromatic hydrocarbons

Cox BA, Anderson JW, Parker JC. 1975. An experimental oil spill The distribution of aromatic hydrocarbons in the water, sediment, and animal tissues within a shrimp pond. In Proceeding of the Conference on the Prevention and Control of Oil Pollution, p. 607-612. 

Singh GB, Salas LJ, Cantrell BK, et al. 1985. Distribution of aromatic hydrocarbons in ambient air. Atmos Environ 19 1911-1919. 

Radke M.,Willsch H.,Teichmuller M. (1990) Generation and distribution of aromatic hydrocarbons in coals of low rank. Org. Geochem. 15, 539—64. 

Distribution of Aromatic Hydrocarbons in Sediments from Selected Atlantic, Gulf of Mexico, and Pacific Outer Continental Shelf Areas... 

The different distributions of aromatic hydrocarbons formed by methanol conversion over ZSM-5 and mordenite, at a pressure of 1 atm (10 Pa) and a temperature of 370 °C. 

Fig. 2. Total ion chromatograms for the sandstone sample (CN409, Subu-1,142.95 m) showing (a) the distribution of aliphatic hydrocarbons and (b) the distribution of aromatic hydrocarbons. Numbers refer to n-alkane chain length. Pr, pristane Ph, phytane DMNs, dimethylnaphthalenes TMNs, trimethylnaphthalenes MFl, methylfluorene P, phenanthrene MPs, methylphenanthrenes and DMPs, dimethy Iphenanthrenes.

The relative distribution of aromatic hydrocarbons in xylene products can be quantitatively determined by gas chromatography. A flame ionization or thermal conductivity detector is used with a capillary or packed column containing crosslinked polyethylene glycol as the stationary phase. The peak area of each component is measured and the weight percentage concentration is calculated by dividing the peak area of the component by the sum of the areas of all peaks. 

Lewis, R.G. and R.W. Coutant. 1999. Determination of phase-distributed polycyclic aromatic hydrocarbons in air by grease-coated denuders. In Lane, D.A., Ed., Gas and Particle Measurements of Atmospheric Organic Compounds. Gordon and Breach Science Publishers, Amsterdam, pp. 201-231. 

Figure 16 Distribution of total hydrocarbons (total aliphatic and aromatic) in sediments from the Caspian Sea ( x,g g dry wt)...

The distribution of compounds produced by this operation is quite different from that obtained from naphtha. The main reason for this is the pronounced aromaticity" of gas oils, which affects the maximum ethylene yield. Moreover, this parameter may substantially from one gas oil to another, and in comparable ojserating conditions this partly explains the wide differences observed in the distribution of the hydrocarbons formed. The Stone and Webster Company established a correlation between the BMCI (Bureau of Mines Correlation Index) for gas oils and the maximum ethylene yield. The BMCL created in 1940, represents an aromaticity index" deOned by the foDowing equation ... 

Distribution, Storage and Excretion. Hydrocarbons in each of the aliphatic and aromatic fractions are expected to be distributed throughout tissues and organs following absorption. Preferential distribution to fatty tissues occurs especially with aliphatic hydrocarbons. Ingested or inhaled volatile aliphatic and aromatic hydrocarbons in the HC5-EC8 and EC5-EC9 fractions can be eliminated in exhaled breath as unchanged parent compound. Metabolic elimination of aromatic hydrocarbons in each EC fraction predominately occurs via oxidative metabolic pathways involving... 

The formation of ketonic and quinonoid derivatives of aromatic hydrocarbons during combustion (Alsberg et al. 1985 Levsen 1988). The environmental distribution of benzanthrone and related compounds such as benzo c,d ] py rene-6-one and cyclo pen ta dtf phenan-threne-4-one has been reviewed (Spitzer and Takeuchi 1995), and such transformation products have been identified in, for example, marine sediment samples (Fernandez et al. 1992), fish from a contaminated river (Vassilaros et al. 1982), and urban aerosols (Galceran et al. 1995 Allen et al. 1997). 

The H-GaAlMFI and Ga/H-ZSM-5 zeolites are compared for their initial activity/selectivity and also for distribution of aromatics formed in the aromatization of C2+ hydrocarbons from natural gas at 600 C and GHSV of 3000 cm. g. h in Table 2. The comparison for the conversion of C2+ hydrocarbons and aromatics selectivity shows that the H-GaAlMFI zeolite is the more active and selective catalyst for the aromatization of C2 + hydrocarbons from natural gas. 

The K value for the silver complex of an acetylene, hex-3-yne, as determined by the distribution method 14>, was found to be 19.1, i.e. smaller than those of alkenes such as the pentenes and cyclohexene, but greater than those of aromatic hydrocarbons 1S). A later study of silver-acetylene complexes 16> using the more rapid solubility technique of Andrews and Keefer 1S> gave rise to quasi thermodynamic equilibrium constants , Ka (as opposed to K) for various methyl substituted hex-3-ynes and hept-2-yne. There was good agreement for the K values for hex-3-yne for the two different methods in each case, replacement of an a-hydrogen atom by a methyl group caused a decrease in the value of Ka, similar to that observed in alkenes. Values of AH approximated to 19-21 kJ mole-1. 

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