Investigation of mechanism of reactions involving oxygen-containing compounds in coal hydrogenation. Final report

Technical Report · Thu Mar 01 04:00:00 UTC 1979

DOI:https://doi.org/10.2172/6158209· OSTI ID:6158209

Cronauer, D. C.; Ruberto, R. G.

The objective of this project was two-fold, namely, to develop an understanding of reactions involving oxygen during hydrogenative liquefaction and to establish a kinetic model to describe coal liquefaction. Emphasis was directed toward the liquefaction of Belle Ayr subbituminous coal with subsequent test runs made with Burning Star bituminous coal. The liquefaction experiments were made in a CFSTR bench-scale unit operated at temperatures between 400 and 470/sup 0/C, space timees between 5 and 60 minutes and a fixed total pressure of 2000 psig. It was shown that between 70% and 85% of the coal organic oxygen is removed as carbon oxides and water. Carboxylic, carbonylic, and etheric functionalities of coal are essentially removed during the liquefaction reaction. The most abundant oxygen-containing group in the reaction product is hydroxylic, a portion of which is necessarily formed by a reduction of other groups. The results of liquefying Belle Ayr coal were correlated by a kinetic model. It is shown that this reaction mechanism (with all reaction rates assumed to be pseudo first order with respect to reacting species) correlates data reasonably well at the temperature levels of 400/sup 0/C, 425/sup 0/C, and 450/sup 0/C for all space times, and at 460/sup 0/C and 470/sup 0/C for small space times. The donor capacity of the solvent strongly affects the rates of the various reactions. This model does not correlate the data for the liquefaction of Burning Star coal in that negative oil yields are observed at short space times. These negative yields are due to solvent entrapment and/or reaction of the solvent with heavy coal liquefactions products.

• Research Organization: Gulf Research and Development Co., Chestwick, PA (USA)
• OSTI ID: 6158209
• Report Number(s): EPRI-AF-913
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CHROMATOGRAPHY
COAL
COAL LIQUEFACTION
COAL LIQUIDS
DATA
DATA FORMS
DIAGRAMS
DISTILLATION
ENERGY SOURCES
EXPERIMENTAL DATA
EXTRACTION
FOSSIL FUELS
FUELS
GAS ANALYSIS
GAS CHROMATOGRAPHY
HYDROGENATION
INFORMATION
KINETICS
LIQUEFACTION
MOLECULAR WEIGHT
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SOLVENTS
REACTION KINETICS
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENTS
SUBBITUMINOUS COAL
TABLES
THERMOCHEMICAL PROCESSES