Characterization of Lignin Gasification and Pyrolysis, 2008 Engineering, Pulping and Environmental Conference

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Lignin is currently burned in recovery boilers. It can potentially be pyrolyzed or gasified to produce value added products. In this study pyrolysis and gasification characteristics of two kraft lignins have been evaluated. Characterization has been performed using a laminar entrained flow reactor (LEFR) and a thermogravimetric analyzer (TGA). The LEFR results show that initial devolatilization occurs very rapidly and the maximum possible residence time in the reactor is not long enough for complete gasification to occur. Pyrolysis of both lignins shows similar behavior until 600°C but secondary reactions occur at higher temperature with the higher ash lignin. Gasification reactions are catalyzed by Na₂CO₃ with the rate increase being proportional to the amount of sodium added.