Process for isomerization of xylene
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United States of America Patent
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Nov 10, 1981
Grant Date -
N/A
app pub date -
Nov 4, 1980
filing date -
Aug 4, 1980
priority date (Note) -
Expired
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Abstract
A process for isomerizing xylenes, which comprises contacting an aromatic hydrocarbon feedstock containing mainly a xylene isomeric mixture containing ethylbenzene with a catalyst of a palladium-containing crystalline aluminosilicate in the vapor phase in the presence of hydrogen to continuously isomerize xylenes and simultaneously de-ethylate the ethylbenzene selectively; interrupting the isomerization reaction; introducing an oxygen-containing gas into a bed of the catalyst in which coke has been deposited during the isomerization reaction, to contact the catalyst with the oxygen-containing gas; burning off the coke deposits on the catalyst with the oxygen-containing gas by gradually increasing the temperature of introduction of the oxygen-containing gas from not more than 200.degree. C. to a temperature in the range of 330.degree. to 390.degree. C. with no part of the catalyst bed exceeding a maximum temperature of 400.degree. C. while controlling the hot spot temperature of the catalyst bed not to exceed 50.degree. C. throughout the burn-off period; reducing in hydrogen the catalyst from which the burnable coke deposits have been removed at least partly; and thereafter resuming the isomerization reaction in the presence of the regenerated catalyst.
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