Process for simultaneously removing nitrogen oxides, sulfur oxides, and particulates
A gas purification process is described including the steps of: cracking a hydrocarbon feedstock in a reactor of a catalytic cracking unit in the presence of a cracking catalyst under catalytic cracking conditions to produce an upgraded cracked product leaving spend cracking catalyst; regenerating the spent cracking catalyst in a regenerator; emitting particulate-laden regenerator off-gases comprising nitrogen oxides, sulfur oxides, and cracking catalyst particulates from the regenerator; passing the regenerator off-gases and a nitrogen oxide-capturing reducing agent generally downwardly together through a substantially vertical conduit of a granular bed filter and scrubber, and thereafter, through at least a portion of a downwardly moving bed of sulfur oxide-capturing and particulate-removing material to remove a substantial portion of the cracking catalyst particulates, nitrogen oxides, and sulfur oxides from the regenerator off-gases so as to produce molecular nitrogen and substantially purified gases having a substantially lower concentration of nitrogen oxides, sulfur oxides, and cracking catalyst particulates than the regenerator off-gases and leaving spent sulfur oxide-capturing and particulate-removing material with the cracking catalyst particulates and sulfur-containing deposits thereon selected from the group consisting of sulfur oxides, sulfates, and combinations thereof; removing the spent material from the granular bed filter and scrubber and feeding the removed material to a generally upright lift pipe riser having an overhead collection vessel.
- Assignee:
- Standard Oil Co., Chicago, IL
- Patent Number(s):
- US 4609537
- OSTI ID:
- 5212588
- Country of Publication:
- United States
- Language:
- English
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Nitrogen oxide, sulfur oxide, and particulate removal system
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Related Subjects
020400* -- Petroleum-- Processing
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORBENTS
AIR POLLUTION CONTROL
CATALYSTS
CATALYTIC CRACKING
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
CONCENTRATORS
CONTROL
CRACKING
CYCLONE SEPARATORS
DECOMPOSITION
EQUIPMENT
FILTERS
GASEOUS WASTES
GRANULAR BED FILTERS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INERTIAL SEPARATORS
MECHANICAL FILTERS
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
PIPES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
PURIFICATION
PYROLYSIS
RARE EARTH COMPOUNDS
REDUCING AGENTS
REGENERATION
REGENERATORS
REMOVAL
SCRUBBERS
SEPARATION EQUIPMENT
SULFIDES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
WASTES