Title:
Synthesis and Characterization of Bio-polyols Synthesized from Various Treated Depolymerized Suberin for Rigid Polyurethane Foams
Author(s):
Abolins, A., Ivdre, A., Volkovs, N., Makars, R., Vevere, L., Paze, A., Godina, D., Rizikovs, J.
Document(s):
Paper
Poster
Abstract:
Biorefining, or extracting value-added products from biomass, and effective usage of waste products, are critical to the sustainability and circularity of economics. One of the potentially usable waste products is birch bark, from which triterpene-rich extracts and suberinic acids can be derived. Birch outer bark contains up to 45% (dry basis) of suberin. Various methods can be applied to obtain suberinic acids from suberin. The aim of this work was to synthesize and characterize polyols from various fractions of suberinic acids. By depolymerization of suberin in an alkaline medium three suberinic acid fractions were obtained: untreated suberinic acids, purified suberinic acids (treated with FeCl3) and suberinic acids salts. The reaction of suberinic acid fractions was carried out with various functionality and molecular weight alcohols, such as diethylene glycol, diethanolamine, triethanolamine and trimethylolpropane. After synthesis, the most common characteristics of synthesized suberinic acid-based polyols, including acid value (6 - 24 mg KOH/g), hydroxyl value (385 - 640 mg KOH/g) and apparent viscosity at the shear rate 50 s-1 (5.2.103 - 7.3.106 mPa.s) were evaluated. It was concluded that most of the synthesized polyols did not achieve the required properties and were unsuitable for rigid polyurethane foam preparation.
Keywords:
forest residues, residues, biobased products, suberin, suberinic acid fractions, suberinic acid-based polyols
Topic:
Biomass Conversion to Bio-Based Products and Chemicals
Subtopic:
Processes for bio-based chemicals and materials
Event:
31st European Biomass Conference and Exhibition
Session:
6BV.2.32
Pages:
1085 - 1088
ISBN:
978-88-89407-23-3
Paper DOI:
10.5071/31stEUBCE2023-6BV.2.32
Price:
FREE
