Development and optimization of solvothermal liquefaction of marine macroalgae Saccharina japonica biomass for biopolyol and biopolyurethane production

摘要

Due to its abundance, macroalgae Saccharina japonica, which is a third-generation biomass, was liquefied to produce biopolyol using a crude glycerol and polyethylene glycol 300 (PEG300) solvent mixture in the presence of sulfuric acid as a catalyst. The reaction parameters, including catalyst loading, reaction time, and reaction temperature, were optimized to obtain high biomass conversion by applying response surface methodology (RSM). The optimal conditions for Saccharine japonica solvothermal liquefaction were determined at 4.25% catalyst loading, a reaction time of 65 min, and a reaction temperature of 160 degrees C, with a corresponding biomass conversion of 82.63%. Finally, biopolyurethane foam with a closed cell structure and polyhedral cell shapes with a similar cell wall thickness was successfully produced, and its temperature at 5% and 10% weight loss were 268 degrees C (T-d5) and 300 degrees C (Td(10)), respectively, comparable to neat polyurethane. We clearly demonstrated that marine biomass could be used for production of biopolyols and biopolyurethane. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.