Catalyst regeneration with varying air flow to burn-off zone from drying zone through halogenation zone

Patent · Tue Oct 20 04:00:00 EDT 1987

OSTI ID:5761328

Greenwood, A R

A method is described for effecting regeneration of spent catalyst particles used in hydrocarbon conversion reactions comprising: (a) passing spent catalyst particles through a burn-off zone; (b) passing catalyst leaving the burn-off zone through a halogenation zone; (c) passing catalyst leaving the halogenation zone through a catalyst drying zone; (d) compressing an air stream drawn from the atmosphere to an elevated pressure; (e) passing the compressed air stream, at a previously determined flow rate, through an air drying zone; (f) passing the heated and dried air stream upward through the catalyst drying zone in countercurrent contact with catalyst; (g) withdrawing a first portion of the air stream emanating from the drying zone catalyst and mixing a halogen compound with it to form the halogenation gas; (h) passing the halogenation gas into contact with catalyst in the halogenation zone; (i) withdrawing halogenation gas from contact with the halogenation zone catalyst and mixing it with gas emanating from the burn-off zone catalyst to form the recycle gas; (j) passing the recycle gas through the catalyst in the burn-off zone to effect combustion of coke deposits on the catalyst; (k) withdrawing a second portion of the air stream emanating from the drying zone catalyst; and, (l) measuring the oxygen content of the recycle gas and varying the flow rate of the second portion of the air stream emanating from the drying zone, thereby varying the amount of air supplied to the burn-off zone from the drying zone by means of the halogenation zone.

• Assignee: UOP Inc., Des Plaines, IL
• Patent Number(s): US 4701429
• OSTI ID: 5761328
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AIR
AIR FLOW
CATALYSTS
CHEMICAL REACTIONS
COMPRESSED AIR
COMPRESSED GASES
DEHYDRATION
DRYING
ELEMENTS
FLUID FLOW
FLUIDS
GAS FLOW
GASES
HALOGENATION
HYDROCARBONS
NONMETALS
ORGANIC COMPOUNDS
OXYGEN
PROCESSING
REGENERATION
THERMODYNAMICS