A5014547824- Thermochemical Biomass Conversion Processes
- Lignin and Wood Chemistry
- Biofuel production and bioconversion
- Granular flow and fluidized beds
- Fire dynamics and safety research
- Energy and Environment Impacts
- Advanced Cellulose Research Studies
- Catalysis for Biomass Conversion
- Heat and Mass Transfer in Porous Media
- Zeolite Catalysis and Synthesis
- Biodiesel Production and Applications
- Combustion and flame dynamics
- Catalytic Processes in Materials Science
- Simulation Techniques and Applications
- Wood Treatment and Properties
- Coal Combustion and Slurry Processing
- Catalysis and Hydrodesulfurization Studies
- Graphite, nuclear technology, radiation studies
- Subcritical and Supercritical Water Processes
- Distributed and Parallel Computing Systems
- Flame retardant materials and properties
- Coagulation and Flocculation Studies
- Material Selection and Properties
- Enzyme-mediated dye degradation
- Innovative Microfluidic and Catalytic Techniques Innovation
National Renewable Energy Laboratory
2016-2024
Washington State University
2012-2020
Four principal intra-particle phenomena occur in a highly concerted manner during the pyrolysis of lignocellulosic materials: heat transfer, mass chemical reactions, and phase changes.
Applications and associated processing technologies of lignocellulosic biomass are becoming increasingly important as we endeavor to meet societal demand for fuels, chemicals, materials from renewable resources. Meanwhile, the rapidly expanding availability capabilities high-performance computing present an unprecedented opportunity accelerate development surrounding lignocellulose utilization. In order realize this potential, suitable modeling frameworks must be constructed that effectively...
This paper presents results on the primary pyrolysis products of organosolv lignin at temperatures between 360 and 700 °C. To study products, a vacuum screen heater (heating rate 8000 °C/s, deep 0.7 mbar, very fast cooling wall temperature −100 °C) was used. The effect secondary studied with fluidized-bed reactor (Treactor 330 580 pine wood. obtained show that were oligomers. Between 450 °C, yield these oligomers high, 80 90%. After formation, left particle by evaporation or thermal...
Abstract Lignin solvolysis from the plant cell wall is critical first step in lignin depolymerization processes involving whole biomass feedstocks. However, little known about coupled reaction kinetics and transport phenomena that govern effective rates of extraction. Here, we report a validated simulation framework determines intrinsic, transport‐independent kinetic parameters for lignin, hemicellulose, cellulose upon incorporation feedstock characteristics methanol‐based extraction poplar...
This study reports changes in solid phase composition when samples of Avicel cellulose (crystallinity: 60.5%) and ball-milled microcrystalline 6.5%) were subjected to pyrolysis a spoon reactor. Solid state chemistry evolution was examined by hydrolysis-ion exchange chromatography, scanning electron miscroscopy (SEM), Fourier transform infrared (FTIR), 13C nuclear magnetic resonance (NMR). The liquid reaction intermediate found cause particle agglomeration at temperatures below 300 °C. At...
In this paper, the effect of secondary reactions in vapor phase on yield and composition pyrolytic lignin (PL) oligomers was investigated. The Pine wood material pyrolyzed at 500 °C a fluidized bed reactor, vapors were transferred to downstream tubular reactor operated residence times between 0 15 s temperatures 400, 500, 550 °C. Relatively small changes PL observed when 400 However, as temperature increased (500 °C), time became more pronounced rate thermal degradation increased. fraction...
We report results from a multiscale computational modeling study of biomass fast pyrolysis in an experimental laboratory reactor that combined the hydrodynamics predicted by two-fluid model (TFM) with predictions finite element method (FEM) simulation heat and mass transfer chemical reactions within particles. The pyrolyzer consisted 2 in. (5.1 cm) diameter bubbling fluidized bed (FBR) fed milled pine pellets. FBR included estimates residence times gas particles spend before they exit. A...
Catalytic fast pyrolysis (CFP) is a conversion process that integrates rapid thermochemical depolymerization of solid feedstocks with catalytic transformation to yield small molecules for fuel and chemical products. This well‐suited the nonfossil such as biomass waste plastics, thereby holds great potential production renewable commodities. In spite many technological developments in various aspects CFP achieved over decades research, this technology has yet attain commercial success fuels...
Pyrolysis of thin films cellulose was performed at five pressures from 4 mbar (vacuum) to 1 bar 500 °C in a modified pyroprobe captive sample reactor designed minimize gas-phase secondary reactions. Known molecule products were identified and quantified by gas chromatography (GC), GC/mass spectrometry (MS), high-performance liquid chromatography, yields calculated. Vacuum allowed the evaporation cellobiosan promoted release heavy oligosaccharides thermal ejection (cellotriosan, etc.),...
The pore structure of biogenic materials imbues the ability to deliver water and nutrients through a plant from root leaf. This anisotropic granularity can also play significant role in processes such as biomass pyrolysis that are used convert these into useful products like heat, fuel, chemicals. Evolutions modeling well imaging structures allow for further insights concerted physics phase change-induced off-gassing, heat transfer, chemical reactions. In this work, we report single particle...