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Search Completed | Title | PEER-REVIEWED ARTICLE bioresources.com USE OF LIGNIN SEPARATED FROM BIO-OIL IN ORIENTED STRAND BOARD BINDER PHENOL-FORMALDEHYDE RESINS
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Text | PEER-REVIEWED ARTICLE bioresources.com USE OF LIGNIN SEPARATED FROM BIO-OIL IN ORIENTED STRAND BOARD BINDER PHENOL-FORMALDEHYDE RESINS | 001
PEER-REVIEWED ARTICLE bioresources.com USE OF LIGNIN SEPARATED FROM BIO-OIL IN ORIENTED
STRAND BOARD BINDER PHENOL-FORMALDEHYDE RESINS
Badamkhand Sukhbaatar,a Philip H. Steele,a and Moon G. Kima*
Bio-oil produced from fast pyrolysis of biomass has been investigated as a renewable fuel and as a source of industrial chemicals. The lignin fraction of bio-oil produced from wood in our fast pyrolysis reactor was separated by using only water and methanol with a 25% yield based on bio-oil weight. This separation procedure appears to be of lower cost than the reported extraction procedure using ethyl acetate as solvent. The isolated pyrolytic lignin was smoothly incorporated into phenol- formaldehyde resins at 30%, 40%, and 50% phenol replacement levels, and the resultant resins were evaluated as oriented strand board core- layer binders. The evaluation results indicated that the pyrolytic lignin is effective for up to about 40% replacement of phenol in synthesizing wood adhesive type PF resins.
Keywords: Bio-oil; Pyrolysis of wood; Pyrolytic lignin; Wood adhesive; Phenol-formaldehyde resins; Oriented strand board binders
Contact information: a: Department of Forest Products, Mississippi State University, Miss. State, MS 397620-9820. *Corresponding author: email@example.com. This article was approved for publication as Journal Article No. FP-512 of the Forest and Wildlife Research Center, Mississippi State University.
The fast pyrolysis method has been a promising approach to the conversion of biomass materials to liquid bio-oil and gaseous and char products, typically resulting in 75% bio-oil, 13% gas, and 12% char based on the dry wood or biomass weight (Bridgewater 1999). Bio-oils produced from various biomass were found to contain 5- 10% organic acids, 5-20% aldehydes and hydroxyaldehydes, 0-10% ketones and hydroxyketones, 20-30% phenolics, and 15-30% water. In all, bio-oils are a mixture of more than 400 chemicals derived from cellulose, hemi-cellulose, and lignin components by thermal breakdown (Diebold and Bridgewater 2002; Czernik and Bridgewater 2005; Ingram et al. 2007).
Bio-oils have been considered as sources of various industrial chemicals (Radelin 1999), and the separation of lignin components has been investigated based on the lignin’s good solubility in organic solvents and poor solubility in water (Chum and Black 1990; Chum and Kreibich 1992). The authors first mixed bio-oil with ethyl acetate, and the resultant organic layer was taken up and then washed with water and sodium bicarbonate solutions to extract out water-soluble and organic acid components. The resultant ethyl acetate solution was evaporated to give the pyrolytic lignin in 31% yield based on bio-oil.
The isolated lignin was examined and shown to be satisfactory as a partial replacement of phenol in synthesizing various phenol-formaldehyde (PF) resins,
Sukhbaatar et al. (2009). “Bio-oil lignin for OSB binder,” BioResources 4(2), 789-804. 789
Image | PEER-REVIEWED ARTICLE bioresources.com USE OF LIGNIN SEPARATED FROM BIO-OIL IN ORIENTED STRAND BOARD BINDER PHENOL-FORMALDEHYDE RESINS
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