Abstract
The results of optimizing the conditions of alkaline lignin depolymerization in a medium of supercritical 2-propanol in order to obtain low molecular weight aromatic compounds, which are potential renewable raw materials for organic synthesis, production of various products and materials, are presented. The designed experiment was applied, based on a central composite rotatable uniform plan design of the second-order for three variables (temperature, process time, liquid module) varied at five levels. The target parameters for optimization were the degree of conversion of lignin to soluble products and their molecular weight. Based on the obtained dependences the optimal depolymerization conditions (450°C, 8 min, liquid module 20) were determined, which ensured the degree of lignin conversion at the level of 73%. Using high-resolution mass spectrometry, it was shown that the resulting depolymerization products have an extremely complex component composition, which includes mainly monomeric and dimeric phenols.
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