A laboratory study of a pretreatment approach to accomodate high-sulfur FCC decant oils as feedstocks for commercial needle coke

Semih Eser, Guohua Wang

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In the delayed coking process, the actual feed to the coking drum consists of a high-boiling fraction of the feedstock, fluid catalytic cracking decant oil (FCC-DO), and the high-boiling end of the liquid products produced by delayed coking (recycle). As distinct from the parent decant oil feed, the molecular composition and coking behavior of actual feed samples to the coking drum (CF) are reported for the first time in this paper. This study examines a commercial pretreatment approach where the feedstock to the fractionator column includes a hydrotreated fraction (HYD) and a vacuum tower bottom (VTB) fraction of a decant oil. Samples of two sets of decant oils including the corresponding HYD, VTB, and CF derivatives were analyzed and carbonized in laboratory reactors to monitor mesophase development from these materials. Decant oil samples and their derivatives, HYD, VTB, and CF, have substantially different molecular composition. The CF samples are characterized by lower degrees of methyl substitution on polyaromatic hydrocarbons (PAH) with higher proportions of thermally stable methyl-PAH isomers. A higher proportion of hydroaromatics and lower concentrations sulfur-containing aromatics characterize the HYD samples, while VTB samples consist exclusively of aromatic ring systems with greater than three condensed rings. Significant differences were also found in the mesophase development from the decant oils and their derivatives. The CF, HYD, and VTB samples produced higher degrees of mesophase development than that obtained from the parent DO.

Original languageEnglish (US)
Pages (from-to)3573-3582
Number of pages10
JournalEnergy and Fuels
Volume21
Issue number6
DOIs
StatePublished - Nov 1 2007

Fingerprint

Sulfur
Coke
Needles
Feedstocks
Coking
Oils
Towers
Vacuum
Hydrocarbons
Derivatives
Boiling liquids
Fluid catalytic cracking
Chemical analysis
Isomers
Substitution reactions
Liquids

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

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abstract = "In the delayed coking process, the actual feed to the coking drum consists of a high-boiling fraction of the feedstock, fluid catalytic cracking decant oil (FCC-DO), and the high-boiling end of the liquid products produced by delayed coking (recycle). As distinct from the parent decant oil feed, the molecular composition and coking behavior of actual feed samples to the coking drum (CF) are reported for the first time in this paper. This study examines a commercial pretreatment approach where the feedstock to the fractionator column includes a hydrotreated fraction (HYD) and a vacuum tower bottom (VTB) fraction of a decant oil. Samples of two sets of decant oils including the corresponding HYD, VTB, and CF derivatives were analyzed and carbonized in laboratory reactors to monitor mesophase development from these materials. Decant oil samples and their derivatives, HYD, VTB, and CF, have substantially different molecular composition. The CF samples are characterized by lower degrees of methyl substitution on polyaromatic hydrocarbons (PAH) with higher proportions of thermally stable methyl-PAH isomers. A higher proportion of hydroaromatics and lower concentrations sulfur-containing aromatics characterize the HYD samples, while VTB samples consist exclusively of aromatic ring systems with greater than three condensed rings. Significant differences were also found in the mesophase development from the decant oils and their derivatives. The CF, HYD, and VTB samples produced higher degrees of mesophase development than that obtained from the parent DO.",
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A laboratory study of a pretreatment approach to accomodate high-sulfur FCC decant oils as feedstocks for commercial needle coke. / Eser, Semih; Wang, Guohua.

In: Energy and Fuels, Vol. 21, No. 6, 01.11.2007, p. 3573-3582.

Research output: Contribution to journalArticle

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