Hydrocracking of model polynuclear aromatics: Pathways, kinetics, and structure/reactivity correlations
- Univ. of Deleware, Newark, DE (United States)
Heavy oil catalytic hydrocracking is a flexible refining process aimed at increasing the hydrogen-to-carbon ratio, while at the same time decreasing the molecular weight of heavy oils. Reliable information on kinetics, pathways and mechanisms is scarce because of the complexity of the feed that obscures reactant structure. The authors have thus sought to introduce the reactant structure through model compound experiments. The reactants were selected in order to sample the basic structural attributes of heavy oils - the total number of rings, the numbers of aromatic rings and the extent of alkyl substitution. The pathways of hydrocracking bare-ring compounds consist of hydrogenation of an aromatic ring, isomerization of the resulting cyclohexyl moiety to a metyl cyclopentyl moiety, ring opening to a butyl side chain, and dealkylation of the side chain at various positions. This ring-by-ring procedure is repeated a new until alkyl benzenes were produced. The authors have extended this reaction family notion to efficiently organize kinetic information in terms of linear free energy relationships. The authors have also studied a more efficient way of cleavage of polynuclear aromatics, where to molecules of alkyl benzenes are produced from one molecule with {>=}3 rings. Certain alkyl biphenyl moieties have been found to undergo this selective cleavage. Additionally, dealkylation pathways and kinetics have been further examined by experiments with long-alkyl substituted compounds (C{sub 4}-C{sub 15}). These results are expected to enhance the understanding of heavy oil hydrocracking and contribute to process modeling and optimization, with special emphasis on product properties.
- OSTI ID:
- 141313
- Report Number(s):
- CONF-930304-; TRN: 93:003688-0989
- Resource Relation:
- Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of 205th ACS national meeting; PB: 1951 p.
- Country of Publication:
- United States
- Language:
- English
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