Transformation of petroleum asphaltenes in supercritical alcohols—A tool to change H/C ratio and remove S and N atoms from refined products

A. M. Chibiryaev, I. V. Kozhevnikov, O. N. Martyanov

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The aliphatic alcohols (methanol, ethanol, 1- and 2-propanol) were used for the upgrading of petroleum asphaltenes. The process was performed under supercritical (sc) conditions at 350 °C. CHNSO analysis and GC methods were used to characterize the elemental and chemical composition of the products preliminarily divided into three fractions: hexane-soluble (HSF), benzene-soluble (BSF), and insoluble residue (IR). It was shown that the sc alcohols leads to the decrease of total content of sulfur and nitrogen in the products (HSF + BSF + IR) by 18–23 and 31–33 wt%, correspondingly, as compared with the initial asphaltenes (IA). The highest yield of the soluble fractions (HSF and BSF) was observed for 1-propanol and ethanol. It appeared that the alcohols used as a reaction media are partially consumed by incorporating in the product molecules as alkoxy substituents. The H and O content of HSF and BSF for all alcohols was significantly higher than that for IA. The composition of hexane-soluble fraction obtained after sc upgrading is quite similar to chemical composition of the diesel fraction, specifically to straight-run gas oil. The efficiency of each supercritical alcohol used for the upgrading of asphaltenes is analyzed and discussed.

Original languageEnglish
Pages (from-to)177-186
Number of pages10
JournalCatalysis Today
Volume329
DOIs
Publication statusPublished - 1 Jun 2019

Keywords

  • Asphaltenes upgrading
  • CHNSO analysis
  • Denitrogenation
  • Desulfurization
  • Supercritical alcohols
  • van Krevelen diagram
  • VACUUM RESIDUE
  • ORGANIC-MATTER
  • HIGH-YIELD
  • ACETAL FORMATION
  • RESONANCE MASS-SPECTROMETRY
  • ACTIVATED CARBON
  • BIO-OIL
  • PARTIAL OXIDATION
  • BITUMEN CRACKING
  • HEAVY CRUDE OILS

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