Fluid catalytic cracking regeneration with reduction of nitrogen emissions

Patent · Tue Jun 27 04:00:00 EDT 1989

OSTI ID:5496345

Kovacs, R C; Krambeck, F J; Sarli, M S

This patent describes a method of reducing the emissions of nitrogen oxides from the regeneration of a fluid catalytic cracking catalyst. The method consists of: (i) contacting spent fluid catalytic cracking catalyst from an FCC reactor, the catalyst having coke deposited on it from cracking with an oxygen-containing regeneration gas, in a dense, fluidized bed in a regeneration vessel to effect oxidative removal of the coke deposited on the catalyst, (ii) maintaining an oxygen/coke ratio in the dense bed to produce regeneration effluent gases containing carbon monoxide by combustion of the coke, (iii) adding additional oxygen-containing regeneration gas in the region above the dense bed, (iv) oxidizing carbon monoxide to carbon dioxide in the presence of entrained catalyst particles in the regeneration effluent gases passing upwards through a substantially vertical, elongated duct within the regeneration vessel, the duct having an inlet above the dense bed to receiver the carbon monoxide-containing regeneration effluent gases and entrained catalyst particles from the region above the dense bed to form effluent gases containing carbon dioxide and (v) separating the catalyst particles from the regeneration effluent gas in a plurality of cyclone separators within the regeneration vessel which receive the effluent gases and entrained catalyst particles from the elongated duct and returning the separated particles to the dense bed.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): US 4843051
• OSTI ID: 5496345
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
020900 -- Petroleum-- Environmental Aspects
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC CRACKING
CHALCOGENIDES
CHEMICAL REACTIONS
COKE
CONCENTRATORS
CRACKING
CYCLONE SEPARATORS
DECOMPOSITION
EMISSION
EQUIPMENT
INERTIAL SEPARATORS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
POLLUTION CONTROL EQUIPMENT
PYROLYSIS
REGENERATION
SEPARATION EQUIPMENT
THERMOCHEMICAL PROCESSES