Green solvents-based fractionation process for kraft lignin with controlled dispersity and molecular weight

Research output: Contribution to journalArticle


The aim of this work is to develop a novel green solvent based sustainable process to refine lignin into low molecular weight (LMW) and high molecular weight (HMW) fractions. Lignin dispersity reduction were experimentally determined using four solvent mixtures, and benchmarked against eight pure solvents. Data outputs were used for modelling the integrated fractionation process. Dispersity reduction of up to 73% was achieved for the high value LMW fraction. Also, a 90% reduction of energy requirement was achieved with an optimized process incorporating a mechanical vapor compression system. This study showed that solvent mixtures involving water can significantly reduce the cost, environment, health and safety impacts of lignin fractionation. Techno-economic evaluation confirmed the economic viability of a large-scale process processing 50 tonne/day of lignin.


External organisations
  • Natural Resources Canada
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Chemical Process Engineering


  • Lignin fractionation, Lignin biorefining, Solubility parameter, Techno-economic analysis, Environmental impact assessment
Original languageEnglish
Article number121799
JournalBioresource Technology
Publication statusPublished - 2019 Nov
Publication categoryResearch

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