Pyrolytic behaviors, kinetics, decomposition mechanisms, product distributions and joint optimization of Lentinus edodes stipe

The pyrolytic behaviors, kinetics, decomposition mechanisms and product distributions and joint optimization of Lentinus edodes stipe (LES) were quantified. Its main pyrolysis stages (the decomposition of hemicellulose) occurred between 200 and 400 degrees C. Random nucleation and nuclei growth (A(0.91)), and orders of reaction (F-1.6 and F-2.1) best explained the three sub-stages of the LES pyrolysis mechanism, respectively. The gas emissions were in good agreement with pyrolysis behavior. The main distributions of the pyrolytic products were classified into the 12 types of acids, alcohols, aldehydes, ketones, esters, phenols, glucopyranoside, aliphatic hydrocarbons, furans, aromatic hydrocarbons, N-heterocyclic substances, and N-containing substances. Cellobiose was found as pyrolytic product during 400 and 600 degrees C. For economic and practical reasons, the target functions of the four responses for the LES pyrolysis were jointly best optimized combining the temperature of 550 degrees C and the heating rate of 12.5 degrees C/min. This study offers theoretical and practical insights into the pyrolysis performance and products of LES or similar second-generation feedstocks in a thermal reactor.