Relationships between Electrical Conductivity Variation and Coking Characteristics of Residue during Thermal Reaction through Online Equipment

Long-li Zhang, Hong-xin Mao, Guo-dong Zhang, Guo-hua Yang, Li Li, Chao-he Yang

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

To study the relationship between the electrical conductivity and the coking performance, a device for the online measurement of the conductivity of heavy oil during thermal reaction was constructed. Three samples with different fraction compositions, including Middle East atmospheric residue (ME-AR), Tahe atmospheric residue (TH-AR), and Saudi Arabia vacuum residue (SA-VR), were selected for study. The conductivity of all samples presents the peak value, before or after the end of the coke induction period. The molar conductivity of asphaltenes, resins, or aromatics in toluene solutions was measured, and the fractions were derived from SA-VR thermal reaction samples under hydrogen. The molar conductivity of asphaltenes in toluene was 20 and 2000 times more than that of resins and aromatics, indicating that the asphaltene was the most important conductive fraction in the petroleum residue. The dipole moments of fractions of SA-VR thermal reaction samples were measured. The concentration of asphaltenes went through a maximum during a reaction, which was consistent with the conductivity variation qualitatively. This work indicated that there were certain relationships between the conductivity variation and the coking characteristics of residue during thermal reaction.
Original languageEnglish (US)
Pages (from-to)5404-5410
Number of pages7
JournalEnergy & Fuels
Volume30
Issue number7
DOIs
StatePublished - 2016
Externally publishedYes

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • General Chemical Engineering
  • Fuel Technology

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