Catalytic cracking of Canadian nonconventional feedstocks. 1. Cracking characteristics of gas oils derived from coprocessing distillate and shale oil
- CANMET, Ottawa, Ontario (Canada)
Two nonconventional vacuum gas oils (VGO's) featuring high nitrogen concentrations were obtained by vacuum distillation of a coal-oil coprocessing product and a shale oil, respectively. Analyses showed that the coprocessing VGO was more aromatic whereas the shale VGO contained more polar components. The two VGO's were cracked in a microactivity test (MAT) unit at different temperatures and catalyst/oil ratios over three commercial catalysts containing rare earth-exchanged or ultrastable Y zeolite (REY or USY). Similar to most products from primary upgrading processes, these two VGO's showed comparatively poor cracking results in terms of conversion, gasoline, and coke yields. This was attributed to nitrogen poisoning of catalysts during cracking of either of the two gas oils and also to the relatively high polynuclear aromatic (PNA) content of the coprocessing VGO. Cracking results improved when nitrogen and PNA compounds were partially removed from the VGO's by solvent extraction or clay adsorption. The treated VGO's can be considered as potential fluid catalytic cracking (FCC) feedstocks. Additive coke resulting from the basic nitrogen and the Conradson carbon residue in the gas oils was found to be dependent only on the temperature. The effect of severity on product distribution and the performance of the three catalysts with respect to nonconventional gas oil cracking are demonstrated and discussed.
- OSTI ID:
- 5088606
- Journal Information:
- Energy and Fuels; (United States), Vol. 5:4; ISSN 0887-0624
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
GAS OILS
CATALYTIC CRACKING
ADSORPTION
CATALYSTS
CHEMICAL COMPOSITION
CHEMICAL REACTION YIELD
CLAYS
COAL LIQUIDS
COPROCESSING
DEACTIVATION
DENITRIFICATION
EXPERIMENTAL DATA
MASS SPECTROSCOPY
NITROGEN COMPOUNDS
OIL SHALES
PETROLEUM DISTILLATES
POISONING
POLYCYCLIC AROMATIC HYDROCARBONS
SOLVENT EXTRACTION
STRUCTURAL CHEMICAL ANALYSIS
VACUUM DISTILLATION
ZEOLITES
AROMATICS
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CRACKING
DATA
DECOMPOSITION
DISTILLATES
DISTILLATION
ENERGY SOURCES
EXTRACTION
FLUIDS
FOSSIL FUELS
FUELS
HYDROCARBONS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LIQUIDS
MATERIALS
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
PROCESSING
PYROLYSIS
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
SHALES
SILICATE MINERALS
SORPTION
SPECTROSCOPY
THERMOCHEMICAL PROCESSES
YIELDS
040403* - Oil Shales & Tar Sands- Refining
010402 - Coal
Lignite
& Peat- Purification & Upgrading
020400 - Petroleum- Processing