Fractional Condensation of Pyrolysis Vapors Produced from Nordic Feedstocks in Cyclone Pyrolysis

Ann Christine Johansson, Kristiina Iisa, Linda Sandström, Haoxi Ben, Heidi Pilath, Steve Deutch, Henrik Wiinikka, Olov G.W. Öhrman

Research output: Contribution to journalArticlepeer-review

49 Scopus Citations

Abstract

Pyrolysis oil is a complex mixture of different chemical compounds with a wide range of molecular weights and boiling points. Due to its complexity, an efficient fractionation of the oil may be a more promising approach of producing liquid fuels and chemicals than treating the whole oil. In this work a sampling system based on fractional condensation was attached to a cyclone pyrolysis pilot plant to enable separation of the produced pyrolysis vapors into five oil fractions. The sampling system was composed of cyclonic condensers and coalescing filters arranged in series. The objective was to characterize the oil fractions produced from three different Nordic feedstocks and suggest possible applications. The oil fractions were thoroughly characterized using several analytical techniques including water content; elemental composition; heating value, and chemical compound group analysis using solvent fractionation, quantitative13C NMR and1H NMR and GC x GC − TOFMS. The results show that the oil fractions significantly differ from each other both in chemical and physical properties. The first fractions and the fraction composed of aerosols were highly viscous and contained larger energy-rich compounds of mainly lignin-derived material. The middle fraction contained medium-size compounds with relatively high concentration of water, sugars, alcohols, hydrocarbonyls and acids and finally the last fraction contained smaller molecules such as water, aldehydes, ketones and acids. However, the properties of the respective fractions seem independent on the studied feedstock types, i.e. the respective fractions produced from different feedstock are rather similar. This promotes the possibility to vary the feedstock depending on availability while retaining the oil properties. Possible applications of the five fractions vary from oil for combustion and extraction of the pyrolytic lignin in the early fractions to extraction of sugars from the early and middle fractions, and extraction of acids and aldehydes in the later fractions.

Original languageAmerican English
Pages (from-to)244-254
Number of pages11
JournalJournal of Analytical and Applied Pyrolysis
Volume123
DOIs
StatePublished - 1 Jan 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5100-66751

Keywords

  • Cyclone pyrolysis
  • Fractional condensation
  • Nordic feedstock
  • Oil characterization
  • Pyrolysis

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