HYDROTHERMAL TREATMENT OF ASPEN AND LOBLOLLY PINE MILLED WOOD LIGNIN
Hydrothermal treatment (HTT) was performed on milled wood lignin (MWL) isolated from aspen Populus tremuloides), representing hardwood syringylguaiacyl, SG lignin and loblolly pine (Pinus taeda), representing softwood G lignin. HTT may result not only in lignin dissolution, but also in lignin condensation taking place between lignin moieties and/or with degradation products of pentoses and hexoses (hydrolytic products of hemicelluloses), such as furfural (F) and 5-hydroxymethylfurfural (HMF). To better understand the effects of HTT on the lignin in softwood and hardwood species, F and HMF were also added in an independent series of HTT experiments. Modified insoluble lignin and soluble lignin degradation products formed during the treatments are currently being analyzed by analytical, spectral, and GC-MS methods. Preliminary results from GC-MS and 2D NMR HSQC analyses suggest homolytic cleavage of lignin as the major degradation pathway. In accordance with these results, condensation of SG (G) lignin with F (HMF) was not observed. The total recovered yields of MWLs, however, indicate a lower solubility of G lignin during HTT with and without HMF.
hydrothermal treatment (HTT) milled wood lignin (MWL) aspen loblolly pine 2,6-dimethoxybenzoquinone(DMBQ)
Mangesh J. Goundalkar Biljana M. Bujanovic
Department of Paper and Bioprocess Engineering,State University of New York, College of Environmental Science and Forestry (SUNY-ESF),Syracuse, NY 13210, USA
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
1019-1022
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）