IN SITU REMOVAL OF IRON COMPLEXES DURING CRACKING
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United States of America Patent
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Issued Date -
Jun 14, 2012
app pub date -
Nov 10, 2011
filing date -
Dec 8, 2010
priority date (Note) -
Abandoned
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Abstract
The presence of complexes predominantly of iron and one or more of chromium, nickel and oxygen and mixtures thereof on the surface of a stainless steel exposed to a feed stream containing hydrocarbons at elevated temperatures tends to give rise to decomposition products of the hydrocarbon. The amount of iron complexes may be reduced in situ without stopping the process by adding to the feed stream 0.001 to 1 vol % a silane and optionally from 0 to 500 ppm based on the weight of the feed stream of sulphur or a sulphur containing compound.
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