Emission control during catalyst regeneration

A process for producing 2,5-dichlorophenol, the process comprising:

• contacting a feed comprising 2,4-dichlorophenol with an isomerization catalyst comprising a zeolite in a reactor system comprising an isomerization zone to form a reaction product comprising 2,5-dichlorophenol, wherein the reactor system further comprises an oxidation catalyst comprising at least one metal oxide, and wherein:
• the reactor system further comprises a catalyst regeneration zone and wherein the catalyst regeneration zone comprises the oxidation catalyst, the oxidation catalyst being effective in converting one or more components of a regeneration effluent generated during regeneration of the isomerization catalyst within the regeneration zone, the process further comprising:
• transferring the isomerization catalyst from the isomerization zone to the catalyst regeneration zone, wherein regenerating the isomerization catalyst comprises:
• heating the isomerization catalyst at a temperature of from about 400° C. to about 1000° C. in the presence of oxygen to remove at least a portion of the chlorinated aromatic compound from the isomerization catalyst and produce a regenerated isomerization catalyst and a regeneration effluent;
• and
• contacting the regeneration effluent with the oxidation catalyst comprising the at least one metal oxide to form an oxidation effluent comprising carbon dioxide, water, and hydrochloric acid.