Abstract: The present invention provides a process for producing an aralkyl compound which comprises catalytically hydrogenating an aralkyl halide compound in a two-layer solvent system comprising water and water-insoluble organic solvent, a dehalogenation method of aralkyl halide compounds by subjecting to catalytic reduction in a two-layer solvent system comprising water and a water-insoluble organic solvent, and a method for recovering aralkyl compound from waste occurred in production of aralkyl halide compound by halogenation of aralkyl compound using the dehalogenation method.

Abstract: Highly pure p-phenylenediamine can advantageously be prepared on a commercial scale by separating and removing o-aminoazobenzene produced as a by-product in the step of producing p-aminoazobenzene, from the product mixture before p-aminoazobenzene is reduced in a process for preparing p-phenylenediamine which comprises preparing p-aminoazobenzene from aniline by way of diazoaminobenzene and then reducing p-aminoazobenzene.