| abstract |
The process for recovering and reusing a ring-halogenation catalyst according to the present invention comprises (A) at least one organic derived from an organic acid having zero or more pKa relative to the Group 4 to 13 metal, the lanthanide metal, or the actinium metal and water. In the presence of at least one salt comprising counter ions and a catalyst composition comprising at least one organic sulfur compound, the aromatic compound is contacted with chlorine or bromine to give a monochloro or monobromo aromatic compound and a Group 4 to 13 metal halide, lanthanum Forming a first product mixture comprising a group metal halide or actinium metal halide; (B) separating the metal halide from the first product mixture; And (C) contacting at least a portion of the metal halide and the aromatic compound with chlorine or bromine and at least one organic sulfur compound to give a monochloro or monobromo aromatic compound and a Group 4 to 13 metal halide, a lanthanide metal halide or Forming a second product mixture comprising actinium metal halides. |