Effect of Pyrolysis Heating Rate on the Chemical Composition of Wood Vinegar From Eucalyptus Urograndis and Mimosa Tenuiflora

Abstract

Among the parameters used in the biomass carbonization process, the heating rate is one of the most important. The objective of the present work was to assess the influence of different heating rates on the chemical composition of wood vinegar (WV) from two wood species. Dried disks of Eucalyptus grandis and Mimosa tenuiflora wood were used as raw material. Carbonization runs were carried out in a laboratory muffle furnace at three heating rates (0.7, 1.0 and 1.4 °C/min), with 10 runs at each heating rate, reaching 450 °C. Yields of charcoal, pyrolysis liquids and gases were determined for all carbonization conditions. Crude pyrolysis liquid from each wood species and each heating rate was bi-distilled, yielding purified WV samples. These samples were extracted with ethyl acetate and the organic fraction was analyzed by gas chromatography-mass spectrometry to obtain qualitative and semi-quantitative data. Results showed that lower heating rates produce higher yields of charcoal, while higher heating rates lead to higher yields of pyrolysis liquids and gases. Totals of 57 and 42 chemical compounds were identified in the WV of Eucalyptus and Mimosa, respectively, divided into the following groups: alcohols, ketones, furans and pyrans, and phenolic compounds. In general, higher heating rates led to greater contents of furans and pyrans and lower concentrations of phenolic compounds.

Pyroligneous acid from Mimosa tenuiflora and Eucalyptus urograndis as an antimicrobial in dairy goats

“…In the study reported by Medeiros et al . (2019), the PA from E . urograndis contained higher amounts of components that were classified as furans compared to the levels observed in PA from M .…”

“…tenuiflora wood (Medeiros et al . 2019). These phenolic compounds, including 4‐ethyl‐2‐methoxyphenol and 4‐propyl‐2‐methoxyphenols (Mahmud et al .…”

“…2015) furans and pyrans (Medeiros et al . 2019). Of these, it has been established that the phenols are present in proportion to the PA of the different forest species used (Pimenta et al .…”

A Comparative Study of Pyrolysis Liquids by Slow Pyrolysis of Industrial Hemp Leaves, Hurds and Roots

“…According to some studies, acetic acid, 2-methoxyphenol (guaiacol), and 2,6-dimethoxyphenol (syringol) are the major compounds present in wood vinegar with pesticide, insecticide, and herbicidal activities [ 47 , 48 , 49 ]. Furthermore, several water-soluble mono- and oligophenols such as 2-methoxyphenol, 2,6-dimethoxyphenol, and 2-methylphenol (cresol) are the major phenols that are present in the bio-oil distillate and these have been reported to have significant antifungal activity as pesticides [ 45 , 50 , 51 ]. The presence of these active compounds in the industrial hemp distillate fractions, at such high concentrations, indicates that hemp distillates have similar or even more potent antibacterial, antifungal, and other pesticide properties when compared to many other lignocellulosic biomasses.…”

Potential use of wood pyrolysis coproducts: A review

“…56 Due to its complex chemical composition and depending on its water concentration, PA has a wide range of applications, for example, as pesticides, plant growth stimulant, additives for animal feed, herbicide, antifungal and antibacterial agents. 57…”