Patent ID: 6657068
Filing Date: 2003-12-02
Classification: C07C

Abstract:
A method for the manufacture of halophthalic acid comprising:forming a reaction mixture comprising: a mixture of about 7 to about 3 parts by weight of acetic acid to 1 part by weight of a halo-ortho-xylene, about 0.25 to about 2 mole percent, based on said halo-ortho-xylene, of a cobalt source, about 0.1 to about 1 mole percent, based on said halo-ortho-xylene, of a manganese source, about 0.01 to about 0.1 mole percent, based on said halo-ortho-xylene, of a source of a metal selected from zirconium, hafnium and mixtures thereof, about 0.02 to about 0.1 mole percent, based on said halo-ortho-xylene, of a source of bromide; maintaining said reaction mixture at a pressure of at least about 1600 Kpa and at a temperature of about 130Â° C. to about 200Â° C.; introducing a molecular oxygen containing gas to said reaction mixture at a rate of at least about 0.5 normal m3 of gas/kg of halo-ortho-xylene in said reaction mixture for a time sufficient to provide at least about 90 percent conversion of said halo-ortho-xylene to halophthalic acid.