Addition of MgCl/sub 2/ to catalyst for cracking carbo-metallic feed oils
A process for economically converting carbo-metallic oils to lighter products while adding magnesium chloride to modify heat output. The carbo-metallic oils contain 650/sup 0/F and material which is characterized by a carbon residue on pyrolysis of at least about 1 and a nickel equivalents of heavy metals content of at least about 4 parts per million. This process comprises flowing the carbo-metallic oil together with particulate cracking catalyst through a progressive flow type reactor having an elongated reaction chamber, which is at least in part vertical or inclined, for a predetermined vapor riser residence time in the range of about 0.5 to 10 seconds, at a temperature of about 900 to 1400/sup 0/F, and under a pressure of about 10 to 50 pounds per square inch absolute sufficient for causing conversion per pass in the range of about 50% to 90% while producing coke in amounts in the range of about 6 to 14% by weight based on fresh feed, and laying down coke on the catalyst in amounts in the range of about 0.3 to 3% by weight. The spent, coke-laden catalyst from the stream of hydrocarbons formed by vaporized feed and resultant cracking products is separated and regenerated in one or more regeneration beds in one or more regeneration zones by burning the coke on the spent catalyst with oxygen. The bed density is in the range of about 25 to 50 pounds per cubic foot and the bed or beds are sustained by fluidization gas containing combustion-supporting gas having a linear velocity in the range of about 0.2 to 4 feet per second. MgCl/sub 2/ is added to the catalyst and is converted to mgo, which reduces sulfur oxide emissions, and a chlorine component, which reduces the CO/sub 2//CO ratio, thereby reducing the heat output of the regenerator. The catalyst particles are retained in the regeneration zone or zones in contact with the combustionsupporting gas for an average total residence time in said zone or zones of about 5 to 30 min.
- Assignee:
- Ashland Oil Inc
- Patent Number(s):
- US 4376696
- OSTI ID:
- 6471654
- Resource Relation:
- Patent File Date: Filed date 23 Mar 1981; Other Information: PAT-APPL-246751
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CATALYSTS
REGENERATION
PETROLEUM
CATALYTIC CRACKING
COKE
FLUIDIZED BED
MAGNESIUM CHLORIDES
VISCOSITY
ALKALINE EARTH METAL COMPOUNDS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CRACKING
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
MAGNESIUM COMPOUNDS
PYROLYSIS
THERMOCHEMICAL PROCESSES
020400* - Petroleum- Processing
400201 - Chemical & Physicochemical Properties