Nonaqueous potentiometry of coal-derived asphaltenes and model nitrogen-containing compounds in acetophenone and nitrobenzene

Darlage, Larry J.; Finkbone, Harry N.; King, Samuel J.; Ghosal, Jitendra; Bailey, Maurice E.

doi:10.1016/0016-2361(78)90157-6

Cited by 21 publications

(2 citation statements)

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“…Potentiometric Titration of Nitrogen Base. The differentiation of nitrogen compounds in petroleum into classes by potentiometric titration in solvents such as chlorobenzene (Deal et al, 1953), nitrobenzene (Darlage et al, 1978), acetonitrile, and acetic anhydride, either alone or in conjunction with another solvent (Buell, 1967;Fritz, 1953), has been extensively investigated. This classification is based on the linear relationship between the half-neutralization potentials (HNP) of these compounds in nonleveling, organic solvents and their basicity (Fritz, 1973).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…This classification is based on the linear relationship between the half-neutralization potentials (HNP) of these compounds in nonleveling, organic solvents and their basicity (Fritz, 1973). Deal et al (1953) studied the moderately strong bases, e.g., piperidines, by comparing titrations with perchloric acid and hydrochloric acid; Darlage et al (1978) differentiated five classes of nitrogen compounds in asphaltene using nitrobenzene as solvent, while Buell classified the nitrogen compounds into four classes using acetonitrile and acetic anhydride solvents (Buell, 1967).…”

Section: Experimental Methodsmentioning

confidence: 99%

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Structural analysis of extracts from spent hydroprocessing catalysts

Choi¹,

Gray²

1988

Ind. Eng. Chem. Res.

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Solvent extracts from spent commercial naphtha and gas oil hydrotreating catalysts were examined in order to elucidate the structure of adsorbed poisons. Amides were identified in the extracts and made up 20-30% of the basic compounds. The oxygen content of the extracts was as high as 28% by weight. Some of this oxygen may be associated with metal complexes or present as inorganic material. Infrared spectroscopic analysis revealed very strong absorptions due to carbonyls, suggesting that compounds such as ketones and carboxylic acids were present. The extracted compounds consisted of saturated (paraffinic and naphthenic) structures and aromatic groups, with >50% boiling at +343 °C. These results suggest polymerization of species on the surface of the catalyst, rather than condensation of aromatic structures to form coke.

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