Title Atliekinės biomasės termocheminis suskystinimas ir aukštesnės vertės bioproduktų sintezė /
Translation of Title Thermochemical liquefaction of residual biomass for higher value bioproduct synthesis.
Authors Jasiūnas, Lukas
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Pages 54
Keywords [eng] solvothermal liquefaction ; waste biomass ; biopolyols ; biopolyurethane ; toxicity
Abstract [eng] Polyurethane is a group of highly versatile polymers that are still largely produced using petroleum feedstocks. Typically, polyurethane is synthesized via reactions between polyols and polyfunctional isocyanates. Polyether and polyester polyols are widely used in production. Solvothermal liquefaction is a complex thermochemical process involving a number of simultaneous and competing solvolysis reactions that decompose chemical bonds in biomass under mild to moderate conditions when under homogeneous catalysis. Depending on the starting material, the biopolyols produced using this technology are rich in aromatic and aliphatic compounds with hydroxy groups, which are generally highly reactive and suitable for substituting petrochemicals in the production of polyurethane products. In this work, the liquefaction of three industrial biomass by-products abundant in Lithuania was investigated. The use of such wastes, residues and by-products could bring technologically advanced biomass industries closer to the resource-efficient concept of biorefining and the principles of circular economy. The biopolyols produced by crude glycerol-mediated solvothermal liquefaction technology in this study have been successfully used in the synthesis of high biomass fraction rigid polyurethane foams and adhesives using commercial isocyanates and polymerization additives. The mechanical, stability, toxicity properties and the potential to recycle these end-use products were determined.
Dissertation Institution Kauno technologijos universitetas.
Type Summaries of doctoral thesis
Language Lithuanian
Publication date 2021