Method for thermally decoking a zeolite catalyst
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United States of America Patent
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Issued Date -
Apr 21, 2005
app pub date -
Dec 28, 2004
filing date -
Dec 14, 2001
priority date (Note) -
Abandoned
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Abstract
The granular, form-selective zeolite catalyst used as bed in a process of producing lower olefins from a feed mixture of higher olefins must be decoked from time to time. This is effected such that the reactor is rinsed with a nitrogen stream heated to 460 to 500.degree. C. for expelling the hydrocarbons, the reactor is then cooled with a nitrogen stream heated to 420 to <460.degree. C., a nitrogen/air mixture heated to 460 to 500.degree. C. then flows through the reactor until complete decoking, and subsequently the reactor is rinsed with a nitrogen stream heated to 460 to 500.degree. C.
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