Method for the injection of catalyst in a fluid catalytic cracking process, especially for heavy feedstocks
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United States of America Patent
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May 23, 1989
Grant Date -
N/A
app pub date -
Feb 7, 1986
filing date -
Feb 7, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method and apparatus for injecting and conditioning regenerated catalyst particles at the base of a catalytic cracking reactor/elevator below the zone where the feedstock to be cracked is injected to give better uniformity of treatment and control of the effective C/O ratio. A first fluid is injected at a low rate into the reactor below the level where the catalyst particles coming from the regenerator are introduced so as to form a dense phase fluidized bed, and a second fluid is injected at a higher rate substantially above the zone where the catalyst particles coming from the regenerator enter so as to form a homogenized dilute phase fluidized bed of catalyst prior to subsequent contact with the feedstock to be treated.
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