Journal
JOURNAL OF WOOD SCIENCE
Volume 64, Issue 5, Pages 675-682Publisher
SPRINGER JAPAN KK
DOI: 10.1007/s10086-018-1746-4
Keywords
Lignin; Radiolysis; Tar; Benzenediols; Polymerization retarders
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The pyrogenic conversion of lignin to a phenolic tar can be significantly enhanced by combining dry distillation with simultaneous electron-beam treatment of lignin. The tar produced by the combined method contains three times more benzenediols in comparison with conventional pyrogenic distillation method. As shown, the tar of radiation-thermal origin can inhibit the thermopolymerization of certain monomers, such as styrene. The inhibiting ability of tar exceeds that of synthetic phenolic inhibitors. In the presence of 0.025wt% of the tar, the induction period of styrene thermopolymerization at 120 degrees C is at least 120min. Radiation-thermal formation of phenolic tar obeys the chain mechanism and thereby, is a highly efficient process.
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