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Abstract

Laboratory batch fractional vacuum pyrolysis of a mixture of birch bark (46%) and birch wood (54%) was carried out in the temperature range of 25-550°C. The oil phase was recovered and was analysed by GC/MS to determine the quantity of phenols in the pyrolysis oil. The active zone of wood decomposition yielding a liquid oil was found to be in the temperature range of 275 and 350°C. A maximum recovery of phenols (monolignols throughout this paper) with 4.9wt.% on an anhydrous wood basis was found in the temperature range of 275 - 350ºC. The total phenols were almost completely recovered at a temperature below 400°C. Furthermore, a separate vacuum pyrolysis experiment was performed in a pilot plant. The pyrolysis oil was subjected to steam distillation which provided a concentrated fraction of phenols with a yield of 21.3% on the oil basis. The steam-extracted fraction was further distilled under vacuum into five sub-fractions. The phenol concentration was in the range of 50-70% by weight for each fraction.

Additional information

Authors: NEPO MURWANASHYAKA J, Institut Pyrovac Inc., Sainte-Foy (CA) and Universite Laval, Department of Chemical Engineering, Sainte - Foy (CA);NÉPO MURWANASHYAKA J, Institut Pyrovac Inc., Sainte-Foy (CA) and Université Laval, Department of Chemical Engineering, Sainte - Foy (CA);ROY C, Institut Pyrovac Inc., Sainte-Foy (CA) and Université Laval, Department of Chemical Engineering, Sainte - Foy (CA);PAKDEL H, Université Laval, Department of Chemical Engineering, Sainte - Foy (CA)
Bibliographic Reference: A chapter in "Fast Pyrolysis of Biomass: a handbook, Volume 2", CPL Press, 2002, pp.407-418. 95 pounds sterling
Availability: Available from: CPL Press, Liberty House, The Enterprise Centre, New Greenham Park, Newbury, RG19 6HW, UK Tel: +44-1635-817408; Fax: +44-1635-817409 Email: press@cplbookshop.com Website: http://www.cplpress.com
ISBN: ISBN: 1-872691-47-1
Record Number: 200215492 / Last updated on: 2002-11-07
Category: PUBLICATION
Original language: en
Available languages: en