Accession Number:

ADA415123

Title:

Fuels Combustion Research: Supercritical Fuel Pyrolysis

Descriptive Note:

Final technical rept. 1 May 2000-30 Nov 2002

Corporate Author:

PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Report Date:

2002-11-01

Pagination or Media Count:

66.0

Abstract:

Supercritical pyrolysis experiments were conducted with toluene, methyl cyclohexane, and n-heptane at temperatures up to 585 C, pressures up to 100 atm, and residence times up to 550 sec Analysis, by HPLCUV, of the toluene reaction products led to the unequivocal identification of 27 individual PAH, up to 10 rings in size. The experiments showed that PAH yields increased exponentially with pressure. For each of the product PAH, values of the preexponential factor. A arid the activation volume V were determined for the pressure-dependent global first-order kinetic rate constant. PAH yields were also extremely sensitive to temperature. At 100 atm and 480 C, PAH of only up to 2 rings were observed at 535 C, PAH up to 10 rings were formed at 585 C, solid deposits formed, plugging the reactor. Similar pressure and temperature sensitivities were exhibited by the PAH produced by methyl cyclohexane. The nature of the PAH product distributions suggested that condensation reactions, involving the addition of aromatic structures and hydrogen loss, were a dominant mechanism for PAH formation in the supercritical environment.

Subject Categories:

  • Physical Chemistry
  • Fuels
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE