Process for reducing coke formation in heavy feed catalytic cracking

Patent · Tue Feb 08 04:00:00 EST 1983

OSTI ID:6410563

Bearden, R; Stuntz, G F

A method for decreasing the amount of coke produced during the cracking of hydrocarbon feedstock to lower molecular weight products in a reaction zone is disclosed, where the feedstock contains at least one metal contaminant selected from the class consisting of nickel, vanadium and iron and where the contaminant becomes deposited on the catalyst such that at least 50 wt. % of the total of the metal contaminants comprises only one of the metal contaminants. The method comprises adding a hydrogen donor material to the reaction zone, monitoring the composition of the metal contaminant on the catalyst, adding an effective passivating amount of at least one of the metal contaminants which is not the major contaminant on the catalyst and passing the catalyst from the reaction zone through a reduction zone maintained at an elevated temperature.

• Assignee: Exxon Research and Engineering Co
• Patent Number(s): US 4372840
• OSTI ID: 6410563
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CATALYSTS
CATALYTIC CRACKING
CHEMICAL REACTIONS
COKE
CRACKING
DECOMPOSITION
HYDROCARBONS
HYDROGEN TRANSFER
INHIBITION
ORGANIC COMPOUNDS
PASSIVATION
PYROLYSIS
REDUCTION
THERMOCHEMICAL PROCESSES