Method for isomerizing halogenated aromatics

摘要

In a halogenated aromatic isomerization method using a zeolite-containing catalyst composition, dissolved oxygen is decreased so that the halogenated aromatic material contains 15 wt ppm or less of dissolved oxygen. As a result, the life or regeneration period of the catalyst can be prolonged. In particular, the method may employ a zeolite catalyst composition in which the maximum diameter of secondary particles of the zeolite in the catalyst composition is 5 microns or less.