Study on pyrolysis kinetics of lignin derived from rice straw by means of several thermoanalysis methods

• 1、College of Mechanical and Electronic Engineering, Shaanxi University of Science and Technology, Xi`an 710021, China
• 2、State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China

Abstract：The pyrolysis characteristics and thermostability of lignin isolated from rice straw was studied by thermogravimetric analysis under the nitrogen and non-isothermal system. The mechanism and kinetics of the thermal decomposition reaction of rice straw lignin were studied by means of the single heating rate method (Coats-Redfern method), multiple heating rate method, and EDAM, and though these to obtain the fitted lines of kinetic equations and thermodynamic parameters. The research results showed that the temperature intervals of the volatile release in the pyrolysis process shifted towards high-temperature region as the heating rates increased, while the maximum rate of weight loss occurred at the temperature range of 250℃ to 450℃. Moreover, the values of thermodynamic parameters had a greater difference during the varying model approachs, and the pyrolysis kinetic of rice straw lignin was described as a first-order reaction model according to Coats-Redfern method.

Keywords： straw enzymatic/acidolysis lignin pyrolysis kinetics