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Title: High-temperature pyrolysis mechanisms of coal model compounds. 1990 annual report

Abstract

The degradation of the carboxylic acid group has been examined with respect to potential pretreatment strategies for fossil fuel conversion processes. In one potential pretreatment strategy involving cation exchange of the carboxylic acid group, a series of benzoic acid and stearic acid salts have been chosen to model the ``tight`` carboxylic acids of immature fossil fuel feedstocks and have been pyrolyzed with an entrained flow reactor. Our preliminary results indicate that Group I and II salts yield primarily the parent acid. Benzoate salts also yield small amounts of benzene while the stearic acid salts give no other detectable products. In two alternative treatment strategies, esterification and anhydride preparation have also been accomplished with these compounds being subjected to the entrained flow reactor conditions. The benzoate esters give a number of products, such as benzaldehyde, benzene, and low MW gases. The formation of these compounds is extremely dependent on pyrolysis conditions and alkoxy chain length. A xenon flashlamp and an entrained flow reactor have been used to heat organic substrates to varying temperatures using different heating rates. Ultrarapid flashlamp pyrolysis (heating rate>10{sup 50}C/s) has been performed. Since the ultrarapid pyrolysis products differ from those observed with traditional heating techniques and differmore » from the products formed photochemically, the flashlamp pyrolysis products are attributed to high temperature thermal activation.« less

Authors:
;
Publication Date:
Research Org.:
West Virginia Univ., Morgantown, WV (United States). Dept. of Chemistry
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10184732
Report Number(s):
DOE/MC/24207-2994
ON: DE91002075
DOE Contract Number:
FC21-87MC24207
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jan 1991
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; STRUCTURAL MODELS; PYROLYSIS; PYROLYSIS PRODUCTS; CARBOXYLIC ACIDS; PROGRESS REPORT; EXPERIMENTAL DATA; HEATING RATE; BENZOIC ACID; 010409; PYROLYSIS AND CARBONIZATION

Citation Formats

Penn, J.H., and Owens, W.H. High-temperature pyrolysis mechanisms of coal model compounds. 1990 annual report. United States: N. p., 1991. Web. doi:10.2172/10184732.
Penn, J.H., & Owens, W.H. High-temperature pyrolysis mechanisms of coal model compounds. 1990 annual report. United States. doi:10.2172/10184732.
Penn, J.H., and Owens, W.H. Tue . "High-temperature pyrolysis mechanisms of coal model compounds. 1990 annual report". United States. doi:10.2172/10184732. https://www.osti.gov/servlets/purl/10184732.
@article{osti_10184732,
title = {High-temperature pyrolysis mechanisms of coal model compounds. 1990 annual report},
author = {Penn, J.H. and Owens, W.H.},
abstractNote = {The degradation of the carboxylic acid group has been examined with respect to potential pretreatment strategies for fossil fuel conversion processes. In one potential pretreatment strategy involving cation exchange of the carboxylic acid group, a series of benzoic acid and stearic acid salts have been chosen to model the ``tight`` carboxylic acids of immature fossil fuel feedstocks and have been pyrolyzed with an entrained flow reactor. Our preliminary results indicate that Group I and II salts yield primarily the parent acid. Benzoate salts also yield small amounts of benzene while the stearic acid salts give no other detectable products. In two alternative treatment strategies, esterification and anhydride preparation have also been accomplished with these compounds being subjected to the entrained flow reactor conditions. The benzoate esters give a number of products, such as benzaldehyde, benzene, and low MW gases. The formation of these compounds is extremely dependent on pyrolysis conditions and alkoxy chain length. A xenon flashlamp and an entrained flow reactor have been used to heat organic substrates to varying temperatures using different heating rates. Ultrarapid flashlamp pyrolysis (heating rate>10{sup 50}C/s) has been performed. Since the ultrarapid pyrolysis products differ from those observed with traditional heating techniques and differ from the products formed photochemically, the flashlamp pyrolysis products are attributed to high temperature thermal activation.},
doi = {10.2172/10184732},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}

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