Document Type : Research Paper

Authors

• Farhod Firouzbehi ¹
• Davood Efhamisisi ²
• Yahya Hamzeh ³
• asghar tarmian ⁴
• Reza Oladi ⁵

¹ Ms. in wood science and technology, University of Tehran, I. R. Iran

² Assistant Professor, Department of wood and paper science and technology, Faculty of Natural resources, University of Tehran.

³ Department of Wood and Paper Science and Technology,Faculty of Natural Resources, University of Tehran

⁴ Associate Proffesor

⁵ Associate Professor, Faculty of Natural Resources, University of Tehran, I. R. Iran

Abstract

Pyrolysis acid or wood vinegar is a dark liquid derived from the condensation of steam and ‎smoke emitted by thermal pyrolysis of wood or any other lignocellulosic material. In this study, ‎a heating furnace was first designed to allow a precise temperature-time program. The wood ‎from three different species including oak, citrus and cypress were pyrolyzed under a specific ‎temperature-time schedule. The smoke emitted from the furnace were cooled and condensed in ‎a 20 m pipe using the flow of cold water, and then was dumped in a container as liquid. ‎Pyrolysis was performed at three different temperature ranges of 200, 260 and 330 ° C. The ‎obtained pyrolysis acids had different color and acidity depending on the temperature and ‎species of wood used. Under the heating conditions used in this study, cypress had lower ‎pyrolysis rate than hardwoods. The weight percentage gain of the treated beech and pine wood ‎varied from 5 to 35%, which was depended to the wood species for treatment, the temperature ‎as well as the wood used for pyrolysis. Acid pyrolysis at higher temperatures resulted in higher ‎weight percentage gain. The acid pyrolysis obtained at lower temperature was leached at ‎higher rates from treated wood. Also the wood types used for pyrolysis had significant effect on ‎the amount of lechant from treated woods. ‎

Keywords

• Acid pyrolysis
• treatability
• Weight percentage gain
• leaching
• Temperature.‎