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Title: Staged thermal fractionation for segregation of lignin and cellulose pyrolysis products: An experimental study of residence time and temperature effects

Abstract

Thermal conversion technologies may be the most efficient means of production of transportation fuels from lignocellulosic biomass. In order to increase the viability and improve the carbon emissions profile of pyrolysis biofuels, improvements must be made to the required catalytic upgrading to increase both hydrogen utilization efficiency and final liquid carbon yields. However, no current single catalytic valorization strategy can be optimized to convert the complex mixture of compounds produced upon fast pyrolysis of biomass. Staged thermal fractionation, which entails a series of sequentially increasing temperature steps to decompose biomass, has been proposed as a simple means to create vapor product streams of enhanced purity as compared to fast pyrolysis. In this work, we use analytical pyrolysis to investigate the effects of time and temperature on a thermal step designed to segregate the lignin and cellulose pyrolysis products of a biomass which has been pre-torrefied to remove hemicellulose. At process conditions of 380 °C and 180 s isothermal hold time, a stream containing less than 20% phenolics (carbon basis) was produced, and upon subsequent fast pyrolysis of the residual solid a stream of 81.5% levoglucosan (carbon basis) was produced. The thermal segregation comes at the expense of vapor product carbonmore » yield, but the improvement in catalytic performance may offset these losses.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Univ. of Oklahoma, Norman, OK (United States). School of Chemical, Biological and Materials Engineering
Publication Date:
Research Org.:
Univ. of Oklahoma, Norman, OK (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
OSTI Identifier:
1425152
Grant/Contract Number:  
EE0006287
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Analytical and Applied Pyrolysis
Additional Journal Information:
Journal Volume: 126; Journal ID: ISSN 0165-2370
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; biomass; pyrolysis; torrefaction; catalysis; separations

Citation Formats

Waters, Christopher L., Janupala, Rajiv R., Mallinson, Richard G., and Lobban, Lance L. Staged thermal fractionation for segregation of lignin and cellulose pyrolysis products: An experimental study of residence time and temperature effects. United States: N. p., 2017. Web. doi:10.1016/j.jaap.2017.05.008.
Waters, Christopher L., Janupala, Rajiv R., Mallinson, Richard G., & Lobban, Lance L. Staged thermal fractionation for segregation of lignin and cellulose pyrolysis products: An experimental study of residence time and temperature effects. United States. doi:10.1016/j.jaap.2017.05.008.
Waters, Christopher L., Janupala, Rajiv R., Mallinson, Richard G., and Lobban, Lance L. Thu . "Staged thermal fractionation for segregation of lignin and cellulose pyrolysis products: An experimental study of residence time and temperature effects". United States. doi:10.1016/j.jaap.2017.05.008. https://www.osti.gov/servlets/purl/1425152.
@article{osti_1425152,
title = {Staged thermal fractionation for segregation of lignin and cellulose pyrolysis products: An experimental study of residence time and temperature effects},
author = {Waters, Christopher L. and Janupala, Rajiv R. and Mallinson, Richard G. and Lobban, Lance L.},
abstractNote = {Thermal conversion technologies may be the most efficient means of production of transportation fuels from lignocellulosic biomass. In order to increase the viability and improve the carbon emissions profile of pyrolysis biofuels, improvements must be made to the required catalytic upgrading to increase both hydrogen utilization efficiency and final liquid carbon yields. However, no current single catalytic valorization strategy can be optimized to convert the complex mixture of compounds produced upon fast pyrolysis of biomass. Staged thermal fractionation, which entails a series of sequentially increasing temperature steps to decompose biomass, has been proposed as a simple means to create vapor product streams of enhanced purity as compared to fast pyrolysis. In this work, we use analytical pyrolysis to investigate the effects of time and temperature on a thermal step designed to segregate the lignin and cellulose pyrolysis products of a biomass which has been pre-torrefied to remove hemicellulose. At process conditions of 380 °C and 180 s isothermal hold time, a stream containing less than 20% phenolics (carbon basis) was produced, and upon subsequent fast pyrolysis of the residual solid a stream of 81.5% levoglucosan (carbon basis) was produced. The thermal segregation comes at the expense of vapor product carbon yield, but the improvement in catalytic performance may offset these losses.},
doi = {10.1016/j.jaap.2017.05.008},
journal = {Journal of Analytical and Applied Pyrolysis},
number = ,
volume = 126,
place = {United States},
year = {Thu May 25 00:00:00 EDT 2017},
month = {Thu May 25 00:00:00 EDT 2017}
}

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