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Title: An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields

Abstract

The overall objectives of this work are to conduct research that will provide the basis for an improved liquefaction process, and to facilitate our understanding of those processes that occur when coals are initially dissolved. Changes in coal structure that occur during coal drying and steam pretreatments will be measured in order to determine what effect water has on retrograde/condensation reactions, and to determine the mechanism by which water enhances coal reactivity toward liquefaction. Different methods for coal drying wig be investigated to determine if drying can be accomplished without destroying coal reactivity toward liquefaction, thereby making coal drying a relatively economical and efficient method for coal pretreatment. Coal drying methods will include conventional thermal drying, microwave drying, and chemical drying at low temperature. State-of-the-art solid-state nuclear magnetic resonance (NMR) techniques using combined rotation and multiple pulse spectroscopy (CRAMPS) and cross polarization with magic-angle spinning (CP/MAS) will be employed: (1) to measures changes in coal structure brought about by the different methods of drying and by low temperature oxidation, and (2) to obtain direct measurements of changes in the aromatic hydrogen-to-carbon ratio of the solid/semisolid material formed or remaining during pretreatment and the initial stages of liquefaction.

Authors:
Publication Date:
Research Org.:
Western Research Inst., Laramie, WY (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
6649439
Report Number(s):
DOE/PC/91043-T5
ON: DE93011450
DOE Contract Number:  
AC22-91PC91043
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; DRYING; NMR SPECTRA; COAL LIQUEFACTION; COAL PREPARATION; COMPARATIVE EVALUATIONS; EXPERIMENTAL DATA; MICROWAVE RADIATION; PROGRESS REPORT; CARBONACEOUS MATERIALS; DATA; DOCUMENT TYPES; ELECTROMAGNETIC RADIATION; ENERGY SOURCES; EVALUATION; FOSSIL FUELS; FUELS; INFORMATION; LIQUEFACTION; MATERIALS; NUMERICAL DATA; RADIATIONS; SPECTRA; THERMOCHEMICAL PROCESSES; 010405* - Coal, Lignite, & Peat- Hydrogenation & Liquefaction; 010300 - Coal, Lignite, & Peat- Preparation- (1987-)

Citation Formats

Miknis, F P. An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields. United States: N. p., 1993. Web. doi:10.2172/6649439.
Miknis, F P. An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields. United States. https://doi.org/10.2172/6649439
Miknis, F P. 1993. "An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields". United States. https://doi.org/10.2172/6649439. https://www.osti.gov/servlets/purl/6649439.
@article{osti_6649439,
title = {An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields},
author = {Miknis, F P},
abstractNote = {The overall objectives of this work are to conduct research that will provide the basis for an improved liquefaction process, and to facilitate our understanding of those processes that occur when coals are initially dissolved. Changes in coal structure that occur during coal drying and steam pretreatments will be measured in order to determine what effect water has on retrograde/condensation reactions, and to determine the mechanism by which water enhances coal reactivity toward liquefaction. Different methods for coal drying wig be investigated to determine if drying can be accomplished without destroying coal reactivity toward liquefaction, thereby making coal drying a relatively economical and efficient method for coal pretreatment. Coal drying methods will include conventional thermal drying, microwave drying, and chemical drying at low temperature. State-of-the-art solid-state nuclear magnetic resonance (NMR) techniques using combined rotation and multiple pulse spectroscopy (CRAMPS) and cross polarization with magic-angle spinning (CP/MAS) will be employed: (1) to measures changes in coal structure brought about by the different methods of drying and by low temperature oxidation, and (2) to obtain direct measurements of changes in the aromatic hydrogen-to-carbon ratio of the solid/semisolid material formed or remaining during pretreatment and the initial stages of liquefaction.},
doi = {10.2172/6649439},
url = {https://www.osti.gov/biblio/6649439}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1993},
month = {Fri Jan 01 00:00:00 EST 1993}
}