Preparation of 1,4-dichlorobenzene

Details Preparation of 1,4-dichlorobenzene Preparation of 1,4-dichlorobenzene

1987-10-08

1988-08-23

McFarlane, Anthony

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Sulfur or compound containing same

502224, 502226, 502231, 423463, 423466, 423468, 423490, 423495, 423497, 423500, 423554, B01J 27053, B01J 2708, B01J 27125, B01J 27138

Patent

active

047661038

ABSTRACT:
1,2-dichlorobenzene is isomerized to 1,4-dichlorobenzene in the presence of a catalyst comprising (a) at least one of AlCl.sub.3 and AlBr.sub.3 and (b) at least one of iodine, alkaline earth metal halides and sulfates and lanthanide halides. Benzene and/or dichlorobenzene is chlorinated with free chlorine in the presence of a catalyst composition comprising (a) at least one suitable metal halide (preferably AlCl.sub.3, SbCl.sub.5 or FeCl.sub.3) and (b) free iodine and/or at least one organic iodo-compound (preferably methyl iodide of p-iodochlorobenzene), so as to obtain a reaction product comprising 1,4-dichlorobenzene. A preferred catalyst composition comprises (a) at least one of AlCl.sub.3 and AlBr.sub.3, (b) free iodine and (c) at least one of alkaline earth metal halides, alkaline earth metal sulfates and lanthanide halides.

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