Role of the hydrogen-donor solvent in coal hydroliquefaction. Progress report, September 1, 1979-November 30, 1980
The principal disproportionation products of 1,2-dihydronaphthalene (1,2-DHN) are naphthalene (Nap) and tetralin (Tet). Dimers of 1,2-DHN constitute 17% and 5% of the respective liquid phase (285 to 315/sup 0/C) and gas phase (385 to 410/sup 0/C) products. The Nap:Tet ratio is one in the presence of solvents, but is > 1 and < 2 in their absence. Gas phase reaction kinetics indicate that 1,2-DHN disappears by simultaneous first and second order reactions. These results are consistent with a concerted second order disappearance of 1,2-DHN to produce equal amounts of Nap and Tet, accompanied by either carbonium ion or free radical side reactions that produce more Nap than Tet, together with 1,2-DHN dimers. Preliminary evaluation of the liquid phase kinetics suggest they follow a similar pattern. The structures of the dimers should reveal whether they were formed by a carbonium ion or free radical mechanism. Isolation of the dimers will be attempted by preparative GC (PGC) followed by TLC to remove thermal decomposition products formed during PGC. Exploratory results suggest that heating 1,2-DHN (300/sup 0/C) in the presence of tetraphenylethane, which dissociates into diphenylmethyl radicals, may constitute a model for the free radical conversion of 1,2-DHN into Nap during coal hydroliquefaction. Further studies of this system will be conducted.
- Research Organization:
- Weber State Coll., Ogden, UT (USA)
- DOE Contract Number:
- AC02-79ER10510
- OSTI ID:
- 6892949
- Report Number(s):
- DOE/ER/10510-T2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Products, radical intermediates, and hydrogen atom production in the thermal decomposition of 1,2-dihydronaphthalene
Role of the hydrogen donor solvent in coal hydroliquefaction. Progress report, March 1, 1982-February 28, 1983
Related Subjects
COAL LIQUEFACTION
HYDROGEN TRANSFER
CHEMICAL REACTION KINETICS
CATALYTIC EFFECTS
DIMERS
GAS CHROMATOGRAPHY
HYDROGENATION
MATHEMATICAL MODELS
NAPHTHALENE
PURIFICATION
RADICALS
SEPARATION PROCESSES
TETRALIN
ZINC CHLORIDES
AROMATICS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMATOGRAPHY
CONDENSED AROMATICS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
KINETICS
LIQUEFACTION
ORGANIC COMPOUNDS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
ZINC COMPOUNDS
ZINC HALIDES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction