Production of Chemicals by Microwave Thermal Treatment of Lignin

摘要: This work investigates the potential of converting one lignocellulosic biomass components, lignin, into value-added bio-products using microwave pyrolysis (MWP). To achieve this objective, a multi-step process was devised and accomplished. First, temperature profiles within material exposed to electromagnetic waves (EMW) were predicted three dimensional mathematical model. Second, an original microwave-thermo gravimetric analyzer (MW-TGA) designed built for kinetic purposes, kinetics MWP investigated in contrast conventional (CP). Third, detailed structural investigation bio-oil produced from kraft lignin discussed at various conditions. Finally, modeling products achieved quantitatively, as well qualitatively. In first step, three-dimensional model created simulate inside EMW 2.45 GHz. COMSOL-Multiphysics applications used transient pinewood, carbon, Pyrex, combinations these materials under different The results compared against experimental data order validate presented key conclusions study show that heating (MWH) leads non-uniform distribution due penetration depth (Dp) surface heat loss. However, limiting dimensions twice Dp placing strong thermal insulation on significantly minimize gradients. locations which are or weak microwave-to-heat convertors can be manipulated create desired hot cold zones heated material, specific profiles. addition, homogenous mixing converter with payload exhibits significant increase temperature, virgin same power time. aims improving understanding composite subjected MWH, developing approaches influence/control through selection.