Energy Citations Database

Bibliographic Citation

 
Document This document is available for digitization by request/sponsorship.
For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field.
For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability.
Title Improved coal conversion in CO/water systems. Quarterly report No. 6, December 4, 1985-March 3, 1986
Creator/Author Ross, D.S. ; McMillen, D.F. ; Hum, G. ; Miin, T.C.
Publication Date1986 Aug 01
OSTI IdentifierOSTI ID: 5406479; Legacy ID: DE86015548
Report Number(s)DOE/PC/70811-6
DOE Contract NumberFG22-84PC70811
Other Number(s)Other: ON: DE86015548
Resource TypeTechnical Report
Resource RelationOther Information: Portions of this document are illegible in microfiche products
Research OrgSRI International, Menlo Park, CA (USA)
Subject01 COAL, LIGNITE, AND PEAT; COAL LIQUEFACTION; CHEMICAL REACTION KINETICS; RESEARCH PROGRAMS; YIELDS; CARBON MONOXIDE; CONDENSED AROMATICS; DEALKYLATION; LIGNITE; ORGANIC SOLVENTS; POTASSIUM HYDROXIDES; PYROLYSIS; QUINOLINES; REDUCTION; STRUCTURAL MODELS; SUBBITUMINOUS COAL; TETRALIN; WATER; ALKALI METAL COMPOUNDS; AROMATICS; AZAARENES; AZINES; BROWN COAL; CARBON COMPOUNDS; CARBON OXIDES; CARBONACEOUS MATERIALS; CHALCOGENIDES; CHEMICAL REACTIONS; COAL; DECOMPOSITION; ENERGY SOURCES; FOSSIL FUELS; FUELS; HETEROCYCLIC COMPOUNDS; HYDROCARBONS; HYDROGEN COMPOUNDS; HYDROXIDES; KINETICS; LIQUEFACTION; MATERIALS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; POTASSIUM COMPOUNDS; PYRIDINES; REACTION KINETICS; SOLVENTS; THERMOCHEMICAL PROCESSES
Description/Abstract This report describes the results of initial studies designed to test the suggestion that the effectiveness of CO/water/base systems in coal conversion can be attributed to the susceptibility of the keto-forms of phenolic coal structures to reaction with hydride- and electron-transfer reagents. The dealkylation, deoxygenation, and coupling or retrograde reactions of p-benzylphenol, 9-phenanthrol, o.o'-biphenol, 2-methyl-l-naphthol, and veratrole (1,2-dimethoxybenzene) have been studied as representative of classes important in coal conversion. Experiments were conducted in fused silica ampoules and stainless steel microautoclaves using at least two donor solvents (typically tetralin and tetralin/THQ) and in CO/H/sub 2/O/KOH systems. Comparison of the conversion rates in the organic and aqueous systems led to the conclusions summarized below: Both dealkylation and deoxygenations can be faster in CO/H/sub 2/O/KOH systems. Dealkylation rate appears to correlate with the amount of base, possibly due to nucleophilic displacement. Deoxygenation is not accelerated when dealkylation is a viable alternative. H/sub 2/O/Base can substantially accelerate coupling reactions. This tendency is moderated by CO. Alkylated polyoxygenated structures undergo rapid Ar-O cleavage. The results of our study suggest that the increased pyrolysis yields reported on methylation of low-rank coals are due not only to protection of hydroxyls from coupling reactions but are also due to enhanced cleavage of the strong Ar-O bonds. These results suggest that the facile dissolution of subbituminous coals in alcoholic KOH media could well be due to reactions of partially alkylated polyphenolic structures rather than to hydrolysis of esters, as has been previously asserted. 18 refs., 3 figs., 6 tabs.
Country of PublicationUnited States
LanguageEnglish
FormatSize: Pages: 26
AvailabilityNTIS, PC A03/MF A01; 1.
System Entry Date2007 Feb 06

Top