The kinetics of the pyrolysis of tar sands and of the combustion of coked sands

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6974833

Lin, L C

The kinetic parameters for the pyrolysis of bitumen-impregnated sandstone (tar sand) particles have been determined by thermogravimetric analysis (TGA). The tar sand deposits investigated in this study, all of which are oil-wet sands from the Uinta Basin the State of Utah, included PR Spring Rainbow I, Whiterocks, and Sunnyside. The isothermal experiments indicated that first-order kinetics fit most of the bitumen conversion range for high pyrolysis temperatures, while a second-order assumption describes the data best at low pyrolysis temperatures. The first-order assumption gave an apparent activation energy of approximately 30 Kcal/mol, while the second order assumption gave an apparent activation energy of about 50 Kcal/mol. The nonisothermal data were analyzed according to Friedman's procedure and the overall integral method. The results of the analyses gave a mixed reaction order between one and two, with an apparent activation energy of approximately 40 Kcal/mol. The intrinsic kinetics of the combustion of the carbonaceous residue or coke deposited on the sand during pyrolysis was studied by TGA. Nonisothermal experiments with a fixed heating rate but with various oxygen partial pressures were conducted. The analyses indicate a reaction order between one and two relative to the unreacted fraction of coke and a fractional order dependence on oxygen partial pressures. The first-order assumption with respect to the unreacted fraction of coke led to an apparent activation energy of 28 kcal/mol and an oxygen partial pressure dependence of 0.5. The second-order assumption gave an apparent activation energy of 43 Kcal/mol and oxygen partial pressure dependence of 0.75.

• Research Organization: Utah Univ., Salt Lake City, UT (USA)
• OSTI ID: 6974833
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040402* -- Oil Shales & Tar Sands-- Surface Methods
ACTIVATION ENERGY
BITUMENS
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CARBONIZATION
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COKING
COMBUSTION
DECOMPOSITION
ELEMENTS
ENERGY
ENERGY SOURCES
FEDERAL REGION VIII
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
GRAVIMETRIC ANALYSIS
KINETICS
MATERIALS
MATHEMATICAL MODELS
NONMETALS
NORTH AMERICA
OIL SAND DEPOSITS
OIL SAND TAILINGS
OIL SANDS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
OXYGEN
PARTIAL PRESSURE
PR SPRINGS DEPOSIT
PRESSURE DEPENDENCE
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
RECOVERY
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SOLID WASTES
SUNNYSIDE DEPOSIT
TAILINGS
TAR
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
UINTA BASIN
USA
UTAH
WASTES