Asphaltene Molecular Structure and Chemical Influences on the Morphology of Coke Produced in Delayed Coking

Autor:	Christopher P. Eppig, Leo D. Brown, M. Siskin, Mobae Afeworki, Simon R. Kelemen
Rok vydání:	2006
Předmět:	Heptane General Chemical Engineering Chemical structure Energy Engineering and Power Technology chemistry.chemical_element Coke Carbon-13 NMR chemistry.chemical_compound Fuel Technology chemistry X-ray photoelectron spectroscopy Chemical engineering Delayed coker Organic chemistry Carbon Asphaltene
Zdroj:	Energy & Fuels. 20:1227-1234
ISSN:	1520-5029 0887-0624
DOI:	10.1021/ef050389h
Popis:	The average chemical structure of asphaltenes present in a vacuum resid feed is related to the morphology of the coke that is produced in a delayed coker (shot coke vs sponge coke). A combination of solid-state 13C NMR, X-ray photoelectron spectroscopy (XPS), and elemental abundance was used to characterize the average chemical structure of several n-heptane asphaltenes from shot-coke- and sponge-coke-producing vacuum resid feeds. The chemical structural properties of the asphaltenes are discussed in relation to the coke morphology produced from the parent resid. The average asphaltene aromatic carbon per cluster size is between 14 and 22 carbon atoms, which corresponds to three-to-five-ring average clusters. When the ratio of aromatic carbon to unreactive (i.e., heterocyclic aromatic) nitrogen and sulfur in asphaltenes is
Databáze:	OpenAIRE
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