Coal transformation chemistry eighth quarterly progress report

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5414427

Stock, L M; Huang, C B; Hung, M; Willis, R S

The effort on donor solvent coal chemistry was directed to the role of pericyclic reactions in the liquefaction process. The product distribution and kinetic isotope effect in the thermal decomposition reaction of 2,2,3,3-tetradeutero-1,4-diphenylbutane has been examined at 400/sup 0/ and 425/sup 0/C with or without tetralin. All the results indicate that free radical processes occur preferentially and that pericyclic reactions are unimportant at the threshold reaction temperature of 400/sup 0/ to 425/sup 0/C. The roles played by organic sulfur compounds and inorganic metal sulfides in coal liquefaction have been investigated. The relative effectiveness of catalytic quantities of metal sulfides, hydrogen sulfide, alkyl thiols, thiophenols, sulfides, sulfur heterocycles, and other organic sulfur compounds for the acceleration of hydrogen-deuterium exchange reactions between the benzylic, aromatic, and aliphatic positions of tetralin-d/sub 12/ and diphenylmethane at 400/sup 0/C has been determined. Benzylic exchange provides a measure of the radical induced ..beta..-scission process and aromatic exchange provides a measure of the ionic dealkylation process. The observations indicate that the metal sulfides which decompose under the experimental conditions to yield surface sulfur promote the hydrogen atom transfer reactions at the benzylic position very effectively. In addition molybdenum(VI) sulfide catalyzes the exchange of the aromatic protons in these molecules. Many organic sulfur compounds accelerate the benzylic exchange reaction modestly, but thiophenol, other arylthiols and compounds that decompose to yield arylthiols are extremely active catalysts for the exchange reaction. Thiophenol and benzyl phenyl thioether enhance the rate of dissolution of Illinois No. 6 coal in tetralin significantly.

• Research Organization: Chicago Univ., IL (USA)
• DOE Contract Number: AC22-80PC30088
• OSTI ID: 5414427
• Report Number(s): DOE/PC/30088-8; ON: DE82014542
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
CARBONACEOUS MATERIALS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
COAL
COAL GASIFICATION
COAL LIQUEFACTION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
HYDROGEN TRANSFER
ISOTOPIC EXCHANGE
LIQUEFACTION
MAGNETIC RESONANCE
MATERIALS
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
ORGANIC SULFUR COMPOUNDS
RADICALS
RESONANCE
SOLVENTS
STRUCTURAL MODELS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES