273590 Fast and Slow Pyrolysis of Lignin Extracted From Prairie Cord Grass, Aspen, and Kraft Lignin

Monday, October 29, 2012: 9:30 AM
316 (Convention Center )
Min Zhang1, Fernando Resende2, Alex Moutsoglou1 and Douglas Raynie3, (1)Mechanical Engineering, South Dakota State University, Brookings, SD, (2)School of Environmental and Forest Sciences, University of Washington, Seattle, WA, (3)Chemistry and Biochemistry, South Dakota State University, Brookings, SD

A study is undertaken to assess the effectiveness of lignin extracted from prairie cordgrass as a pyrolysis feedstock. The effects of variability of lignin source on fast and slow pyrolysis products are also investigated. To accomplish these goals, Py-GC/MS and TGA/FTIR are employed in the pyrolysis of three types of lignin: prairie cordgrass (PCG) lignin extracted from prairie cord grass, aspen lignin extracted from aspen trees (hardwood), and synthetic Kraft lignin. Fast pyrolysis results from Py-GC/MS show that for PCG lignin only ten of the detected compounds have relative peak area percentiles that exceed 2% and make up over 52% of the total area. For aspen lignin, excluding butanol that is used in the extraction process, only eight compounds are found to have relative peak areas exceeding 2% that make up over 52% of the total area, as is the case for Kraft lignin where again eight compounds exceeding 2% are found to make up more than 45% of the total area. Both techniques, Py-GC/MS and TGA/FTIR, indicate that PCG lignin releases more alkyls than aspen and Kraft lignin. TGA/FTIR results indicate that PCG lignin also releases by far the most light volatile products (<200°C) while producing the least amount of char among the three types of lignin studied. These characteristics make PCG lignin a good choice in producing good quality bio-oil and thus decreasing upgrade requirements. Py-GC/MS results conclude that aspen lignin produces significantly more pyrolytic products than PCG lignin. This is indicative of the potential of aspen lignin to result in higher conversion rates of bio-oil than the other two lignins.

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See more of this Session: Reaction Engineering for Biomass Conversion
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