Abstract: Homogeneous metal catalysts demonstrate good catalytic performance and are extensively applied in petrochemical, pharmaceutical and fine chemical industries. During recycling of homogeneous metal catalysts, metal leaching generates catalyst-laden waste liquid. Upon activity degradation, the decommissioned catalysts form additional spent catalyst waste streams. Due to the different properties of homogeneous metal catalyst waste liquid, suitable recovery methods can be selected. These mainly include physical and chemical recovery methods such as extraction, adsorption and distillation, as well as chemical recovery methods such as precipitation, digestion, oxidation-reduction, incineration and supercritical water oxidation. The recycling and reuse of homogeneous metal catalyst waste liquid is beneficial for cost reduction, resource conservation and environmental protection.

Key words: homogeneous metal catalyst, waste liquid, recycling