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Master Thesis: Repolymerization of degraded technical lignins

RISE is the Swedish Research Institute and innovation partner. In international collaboration with industry, academia and the public sector, we ensure the competitiveness of the business community and contribute to a sustainable society. Our 2,700 employees support and promote all manner of innovative processes. RISE is an independent, state-owned research institute that offers unique expertise and about 100 testbeds and demonstration facilities, instrumental in future-proofing technologies, products and services. www.ri.se

Project goal

To develop a method for extraction and characterization of components from technical lignins, which can be used as monomers in polymerization reactions.


Wood consists of about 30% lignin. During kraft pulping the lignin is to a large extent dissolved into the cooking liquor. Today this so-called kraft lignin is considered a highly interesting raw material for development of bio-based materials and chemicals. The isolation of lignin from the cooking liquor yields a material with a broad range of molar masses and properties. The isolated lignins comprise a large portion of compounds of low molecular mass which, if properly isolated, could be useful building blocks in repolymerization.

The use of organic polymers is ubiquitous in the modern world, and predominantly relies on fossil resources. Thus, there is a dire need for alternative solutions from biobased materials. Integrating isolated lignin in polymer production could be one such solution, towards which isolation and identification of the compounds in the kraft lignins is a first step.

In this work isolation and characterization of low molecular weight components from selected kraft lignin samples will be studied, and the isolated compounds will be investigated as monomers for polymerization.


  • Brief literature study
  • Isolation and separation of lignin followed by characterization by NMR and MS-techniques
  • Derivatization and polymerization of the isolated compounds           
  • Report writing
  • Project presentations

Final application date: 31/3 2019


Jerk Rönnols, RISE Bioeconomy 08-676 71 24

Anna Jacobs, RISE Bioeconomy 08-676 71 52

Union representatives: Anna Jensen (Unionen), 08-676 72 23 and Elisabeth Sjöholm (Sveriges Ingenjörer), 08-676 74 44.

Master Thesis, RISE, Bioeconomy, lignin, wood, polymer, Stockholm





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