Pyrolysis Characteristics of Wood-Based Panels and its Products

Abstract

Wood-based panels containing urea formaldehyde (UF) resin will be focused on to make clear the influence of UF resin on pyrolysis products and transformation mechanism during pyrolysis of waste wood composites. Thermogravimetric analysis (TGA) will be used to study the thermal degradation reaction kinetics according to different heating rate. Thermogravimetric analyzer coupled to a Fourier transform infrared spectrometer analysis (TGA-FTIR), X-ray photoelectron spectroscopy (XPS) and gas chromatography coupled with mass spectrometry (GCMS) will be used to study the gas, solid, liquid products, respectively. Results from TG and differential thermogravimetric analysis (DTG) indicate that UF resin at first accelerated the degradation rate however inhibited the degradation of wooden composites over the whole pyrolysis process. Compared with wood, UF resin had an obvious effect on the release of HNCO and NH 3 . Mass loss of hydrogen is significantly inhibited by UF resin and nitrogen is much stable in the char with structure of the pyridine and pyrrole at relative content of 6.65% and 7.45% respectively. Influence of UF resin on pyrolysis liquids of wooden composites is mainly on nitrogen compounds and ketones rather than aldehydes and esters, which is probably due to the chemical reactions of UF resin with lignin constituent in wood.

Influence of Nickel Modified Beta Zeolite in the Production of BTEX During Analytical Pyrolysis of Medium-Density Fiberboard (MDF)

“…This distribution of products from pyrolytic vapors of pre-treated MDF residues in chemical classes is similar to the results found in a former study of our group, where non-treated MDF residues based on eucalyptus and pinus woods have been employed [10]. Other researchers have also found mainly phenolic compounds and other oxygenated classes, as for example, ketones in the bio-oil of wood-based panels [2]. No nitrogen compound has been identified in MDF pyrolysis vapors, as shown in Table 3 and Online Resource 1 in Table ESM2.…”

“…In general, MDF residues contain nitrogen due to the addition of synthetic resins [urea-formaldehyde (UF), phenol-formaldehyde (PF) and melamine-formaldehyde (MF)] during production and/or finishing stages of MDF production. These nitrogen-containing compounds (N-compounds) are responsible for the formation of toxic compounds (hydrocyanic acid, isocyanic acid, and ammonia) during thermal processing (combustion and pyrolysis) of the residue, as well as for the constant release of formaldehyde from panels [2]. Therefore, a pre-treatment of MDF residues to remove the N-compounds is an alternative to make a safer subsequent pyrolysis step and also to minimize the toxicity of these residues.…”

“…The fast pyrolysis of MDF residues have been proven useful for producing fuels and/or high added value compounds, but the bio-oil obtained has limited applications because of the high amounts of phenolic and other oxygen-containing compounds (O-compounds) [2,10]. It is known [11,12] that the use of catalysts can overcome this drawback, favoring the production of more valuable compounds for the industry as well as tailoring products distribution.…”

Comparative study on slow pyrolysis products of abandoned furniture materials

“…The main product of volatile liquid pyrolysis of solid wood is an organic acid with an acidic pH of 4.21 to 5.23, which can be used directly as an herbicide (Liu et al 2021a), and also used as a liquid fertilizer after being diluted with water (Wang et al 2022). The pH value of the wood-based panel pyrolysis liquid product was 5.64 to 8.56, showing weak acidity to weak alkalinity, due to integration of the nitrogen into structure of liquid compounds adhesives and decorative layers (Mu et al 2011). The nitrogen in the liquid from PB and MDF pyrolysis, mainly was present as amine-N and heterocyclic-N, which showed excellent anti-bacterial performance, thus could be used for wood preservation (Mu et al 2011).…”

“…The pH value of the wood-based panel pyrolysis liquid product was 5.64 to 8.56, showing weak acidity to weak alkalinity, due to integration of the nitrogen into structure of liquid compounds adhesives and decorative layers (Mu et al 2011). The nitrogen in the liquid from PB and MDF pyrolysis, mainly was present as amine-N and heterocyclic-N, which showed excellent anti-bacterial performance, thus could be used for wood preservation (Mu et al 2011). Pyrrole, pyridine, pyrazine, and other compounds are five-and sixmembered N-heterocyclic compounds, which are alkaline and neutralize the organic acids produced during the pyrolysis of cellulose and lignin.…”