Liquid Product of Liquid Phase Pyrolysis
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Ligno-cellulosic feed is expected to contribute significantly to production of liquefied combustibles in the future, because of the quantity and the variety of feed material. Therefore the pyrolytic degradation properties of wood and its building blocks glucose and cellulose were investigated.
The process was carried out in a semi-batch reaction vessel under isothermal conditions at a temperature of T = 623 K and at ambient pressure. For optimum heat transfer the pyrolysis process was carried out in liquid carrier phase. Gaseous as well as condensable products were removed on top of the reaction vessel. Condensation temperature was T = 20 °C. After recording flux and composition the gaseous phase was incinerated in a flare. The condensed products were analyzed by GC-MS and NMR spectroscopy as well as elementary analysis.
The product yield was determined. Liquid CHO-products and water formed during pyrolytic degradation were evaluated for several feed materials. All biomasses generate nearly the same amount of liquid CHO-products, while the water quantity differs. Because of lignin content wood generates the least water fraction, whereas the mono-sugar glucose shows a high tendency of water formation.
The yield was examined for selected products generated by liquid-phase pyrolysis. Wood, with about 40% cellulose, shows different reaction paths than cellulose and glucose monomer. Degradation of cellulose is seemingly controlled by cleavage plus dehydration, while ligno-cellulosic feed leads to formation of methoxy-substituted phenols. Moreover wood degrades to acetic acid, whereas cellulose and glucose forms just traces of it.
Nikolaus Schwaiger is a doctoral student doing his Ph.D. studies at the Graz University of Technology at the Institute of Chemical Engineering and Environmental Technology. His work is sponsored by BDI-BioDiesel International AG. He has also studied at the Université de Rennes in Rennes, France as part of an ERASMUS stay. He has a degree from the Technical University Graz in Technical Chemistry and Chemical Engineering. In 2009 he completed a diploma thesis for BDI-BioDiesel International. Other work experience includes Sappi Austria, Gratkorn, where he was production operator. He was a...Read more
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