| 摘要 |
PROBLEM TO BE SOLVED: To provide a production process of m-xylene by isomerization of o-xylene in which the catalyst does not cause deterioration in its catalytic activity even in the case that the regeneration of the catalyst is repeated. SOLUTION: A catalyst containing ZSM-4 and/or ω-zeolite, a kind of crystalline aluminosilicate zeolite, is used to isomerize o-xylene in the vapor or liquid phase to produce m-xylene. In this case, the catalyst of which isomerization activity is deteriorated is regenerated in an oxygen-containing gas at a temperature of <=400 deg.C. |
