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Projects / Programmes source: ARIS

Process development for lignin valorisation to aromatic building blocks and further production of bio-based polymers

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Research activity

Code Science Field Subfield
2.02.04  Engineering sciences and technologies  Chemical engineering  Catalysis and reaction engineering 

Code Science Field
2.04  Engineering and Technology  Chemical engineering  
Keywords
Biomass, lignin, fractionation, catalytic hydrotreatment, bio-based building blocks, polymerisation, NMR, lumped kinetic model, ;
Evaluation (rules)
source: COBISS
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (16)
no. Code Name and surname Research area Role Period No. of publications
1.  52432  PhD Ana Bjelić  Engineering sciences and technologies  Researcher  2020  60 
2.  24448  PhD Mirko Cevec  Natural sciences and mathematics  Researcher  2020 - 2023  65 
3.  34522  PhD Miha Grilc  Engineering sciences and technologies  Head  2020 - 2023  369 
4.  38259  PhD Brigita Hočevar  Engineering sciences and technologies  Researcher  2020 - 2023  83 
5.  30470  PhD Nejc Hodnik  Engineering sciences and technologies  Researcher  2020  348 
6.  10692  PhD Miroslav Huskić  Natural sciences and mathematics  Researcher  2020 - 2023  295 
7.  34342  PhD Matej Huš  Engineering sciences and technologies  Researcher  2020 - 2023  624 
8.  27687  PhD Edita Jasiukaityte  Engineering sciences and technologies  Researcher  2020 - 2023  119 
9.  26222  Urška Kavčič    Technical associate  2020  16 
10.  25446  PhD Blaž Likozar  Engineering sciences and technologies  Researcher  2020 - 2023  1,090 
11.  24975  PhD Damjan Makuc  Natural sciences and mathematics  Researcher  2020 - 2023  126 
12.  57729  Jakov-Stjepan Pavelić  Engineering sciences and technologies  Researcher  2023  0 
13.  10082  PhD Janez Plavec  Natural sciences and mathematics  Researcher  2020 - 2023  1,217 
14.  31601  PhD Irena Pulko  Engineering sciences and technologies  Researcher  2020 - 2023  132 
15.  54883  Tina Ročnik  Engineering sciences and technologies  Technical associate  2021 - 2023  34 
16.  38311  PhD Janvit Teržan  Engineering sciences and technologies  Researcher  2020  61 
Organisations (2)
no. Code Research organisation City Registration number No. of publications
1.  0104  National Institute of Chemistry  Ljubljana  5051592000  20,953 
2.  2933  FAKULTETA ZA TEHNOLOGIJO POLIMEROV (Slovene)  Slovenj Gradec  2250152  2,315 
Abstract
The proposed project covers the topic of lignin valorisation to aromatic building blocks and the further production of bio-based polymers. Lignin is a complex branched polymer of p-coumaryl, coniferyl and sinapyl alcohols. Its diverse building blocks and random connectivity make lignin by far the most complex LC biopolymer, but is still the only renewable source of an important and high-volume class of compounds – the aromatics. The complexity of the structure of lignin is one of the main reasons it is being valorised into value-added chemicals on a small or demonstrational scale. The production of targeted chemicals from lignin, especially with high selectivity, is a very demanding task alongside further complex isolation and purification procedures. Therefore, this project will not aim at the conversion of lignin into a particular drop-in chemical, but rather demonstrate the suitability of selected raw materials and tailored lignin isolation, and the eventual fractionation and depolymerisation, to yield a blend of bio-aromatics with well-defined chemical properties (i.e. molecular weight distribution, concentration of free OH groups). Subsequently, these bio-aromatics will be tested in final phenol-formaldehyde and epoxy resins formulations. Lignin fractions in this case will serve as functional substitutes for phenol or bisphenol A. A comprehensive, well-structured, systematic and integrative experimental and in-silico supported study, will cover the whole value chain starting from the isolation of different lignin types and finishing with the testing of new chemicals in final polymer formulations. This will provide essential information for the understanding, optimization, and production of new bio-based chemicals as well as the establishment of feedstock structure-product quality correlation. For this reason, lignin will be isolated from different sources (hardwood, softwood, straw, algae) bearing different structural features and functionalities. An organosolv process will be applied to isolate lignin given that it is recognised as an effective isolation method, is industrially applicable, and yields close-to-native lignin structure. Isolated lignin will be separated into fractions with different molecular weight (Mw) distributions, which will be submitted to catalytic depolymerisation. Depolymerisation will likely yield different monomer/oligomer mixtures with different selectivity depending on different reaction parameters. Selected depolymerisation products as well as light (low Mw) lignin fractions will be tested in various polymer formulations. Suitability of the lignin-derived substitutes will be defined by comparing mechanical and thermoanalytical properties of the bio-based and conventionally prepared polymers. Finally, every step in the production of aromatic functional analogues from lignin will be mathematically described with a lumped kinetic model and statistical correlations which will allow optimization of the operation conditions and lignin type selection to achieve targeted product/formulation quality.
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