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Title: Lignin-assisted coal depolymerization

Abstract

Previous research has shown that addition of lignin-derived liquids to coal stirred in tetralin under mild reaction conditions (375{degree}C and 300--500 psig) results in a marked enhancement in the rate of coal depolymerization. A mathematical model was developed to study the kinetics of coal depolymerization in the presence of liquid-derived liquids. In the present study, a reaction pathway was formulated to explain the enhancement in coal depolymerization due to lignin (solid) addition. The model postulated assumes that the products of lignin obtained during thermolysis interact with the reactive moieties present in coal while simultaneous depolymerization of coal occurs. A good fit between the experimental data and the kinetic model was found. The results show that in addition to the enhancement in the rate of coal depolymerization, lignin also reacts (and enhances the extent of depolymerization of coal) with those reaction sites in coal that are not susceptible to depolymerization when coal alone is reacted in tetralin under identical reaction conditions. Additional work is being carried out to determine a thorough materials balance on the lignin-assisted coal depolymerization process. A number of liquid samples have been obtained which are being studied for their stability in various environments. 5 refs., 4 figs.,more » 1 tab.« less

Authors:
Publication Date:
Research Org.:
Southern Illinois Univ., Carbondale, IL (United States). Dept. of Mechanical Engineering and Energy Processes
Sponsoring Org.:
USDOE; ILDENR; USDOE, Washington, DC (United States); Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States)
OSTI Identifier:
5795190
Report Number(s):
DOE/PC/91334-T12
ON: DE92007880
DOE Contract Number:  
FG22-91PC91334
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; DEPOLYMERIZATION; LIGNIN; COAL LIQUEFACTION; EXPERIMENTAL DATA; MATHEMATICAL MODELS; MEDIUM PRESSURE; PROGRESS REPORT; TEMPERATURE RANGE; TETRALIN; AROMATICS; CARBOHYDRATES; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; DATA; DECOMPOSITION; DOCUMENT TYPES; ENERGY SOURCES; FOSSIL FUELS; FUELS; HYDROAROMATICS; HYDROCARBONS; INFORMATION; LIQUEFACTION; MATERIALS; NUMERICAL DATA; ORGANIC COMPOUNDS; POLYSACCHARIDES; SACCHARIDES; THERMOCHEMICAL PROCESSES; 010405* - Coal, Lignite, & Peat- Hydrogenation & Liquefaction

Citation Formats

Lalvani, S B. Lignin-assisted coal depolymerization. United States: N. p., 1991. Web. doi:10.2172/5795190.
Lalvani, S B. Lignin-assisted coal depolymerization. United States. https://doi.org/10.2172/5795190
Lalvani, S B. 1991. "Lignin-assisted coal depolymerization". United States. https://doi.org/10.2172/5795190. https://www.osti.gov/servlets/purl/5795190.
@article{osti_5795190,
title = {Lignin-assisted coal depolymerization},
author = {Lalvani, S B},
abstractNote = {Previous research has shown that addition of lignin-derived liquids to coal stirred in tetralin under mild reaction conditions (375{degree}C and 300--500 psig) results in a marked enhancement in the rate of coal depolymerization. A mathematical model was developed to study the kinetics of coal depolymerization in the presence of liquid-derived liquids. In the present study, a reaction pathway was formulated to explain the enhancement in coal depolymerization due to lignin (solid) addition. The model postulated assumes that the products of lignin obtained during thermolysis interact with the reactive moieties present in coal while simultaneous depolymerization of coal occurs. A good fit between the experimental data and the kinetic model was found. The results show that in addition to the enhancement in the rate of coal depolymerization, lignin also reacts (and enhances the extent of depolymerization of coal) with those reaction sites in coal that are not susceptible to depolymerization when coal alone is reacted in tetralin under identical reaction conditions. Additional work is being carried out to determine a thorough materials balance on the lignin-assisted coal depolymerization process. A number of liquid samples have been obtained which are being studied for their stability in various environments. 5 refs., 4 figs., 1 tab.},
doi = {10.2172/5795190},
url = {https://www.osti.gov/biblio/5795190}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}