Molecular composition of the high-boiling components of needle coke feedstocks and mesophase development

Guohua Wang, Semih Eser

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Mesophase development during the carbonization of needle coke feedstocks in delayed coking affects the microstructural anisotropy (or graphitizability) of the resulting coke. Previous work has employed gas chromatography/mass spectrometry (GC/MS) to study the relationships between the molecular composition of the fluid catalytic cracking decant oil (FCC DO) and mesophase development. In this study, the principal emphasis was placed on analyzing the non-GC amenable fraction of DO samples using a combination of analytical techniques, including high pressure liquid chromatography with photodiode array (PDA) and mass spectrometer detectors in tandem (HPLC/PDA and HPLC/MS/MS), and laser desorption mass spectrometry (LD/MS). The experimental data showed that major molecular species in DO samples consist of 3-6 ring multimethyl-substituted polyaromatic hydrocarbons (PAHs), including phenanthrenes, pyrenes, chrysenes, benzopyrenes, perylenes, and benzo[g,h,i]perylenes. Large differences were observed in the molecular composition of decant oil samples, particularly in the distribution of the methylPAH homologues and the degree of methylation on a given PAH. High-boiling PAHs (identified by LD/MS) and low-boiling PAHs (identified by GC/MS) were found to have similar distribution trends in molecular composition. The degree of mesophase development was found to depend strongly on the molecular composition of the feedstock samples. In particular, the ratio of total concentrations of pyrenes/phenanthrenes correlates with the degree of mesophase development during carbonization.

Original languageEnglish (US)
Pages (from-to)3563-3572
Number of pages10
JournalEnergy and Fuels
Volume21
Issue number6
DOIs
StatePublished - Nov 1 2007

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Hydrocarbons
Coke
Needles
Boiling liquids
Feedstocks
Mass spectrometry
Pyrenes
Phenanthrenes
Pyrene
Carbonization
Photodiodes
Chemical analysis
Chrysenes
Gas chromatography
Desorption
Oils
Benzopyrenes
High pressure liquid chromatography
Fluid catalytic cracking
Methylation

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "Mesophase development during the carbonization of needle coke feedstocks in delayed coking affects the microstructural anisotropy (or graphitizability) of the resulting coke. Previous work has employed gas chromatography/mass spectrometry (GC/MS) to study the relationships between the molecular composition of the fluid catalytic cracking decant oil (FCC DO) and mesophase development. In this study, the principal emphasis was placed on analyzing the non-GC amenable fraction of DO samples using a combination of analytical techniques, including high pressure liquid chromatography with photodiode array (PDA) and mass spectrometer detectors in tandem (HPLC/PDA and HPLC/MS/MS), and laser desorption mass spectrometry (LD/MS). The experimental data showed that major molecular species in DO samples consist of 3-6 ring multimethyl-substituted polyaromatic hydrocarbons (PAHs), including phenanthrenes, pyrenes, chrysenes, benzopyrenes, perylenes, and benzo[g,h,i]perylenes. Large differences were observed in the molecular composition of decant oil samples, particularly in the distribution of the methylPAH homologues and the degree of methylation on a given PAH. High-boiling PAHs (identified by LD/MS) and low-boiling PAHs (identified by GC/MS) were found to have similar distribution trends in molecular composition. The degree of mesophase development was found to depend strongly on the molecular composition of the feedstock samples. In particular, the ratio of total concentrations of pyrenes/phenanthrenes correlates with the degree of mesophase development during carbonization.",
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Molecular composition of the high-boiling components of needle coke feedstocks and mesophase development. / Wang, Guohua; Eser, Semih.

In: Energy and Fuels, Vol. 21, No. 6, 01.11.2007, p. 3563-3572.

Research output: Contribution to journalArticle

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