A Comparison of Liquid and Supercritical Carbon Dioxide as an Extraction Solvent for Plating Bath Treatment

摘要: Because of increasing federal regulations, alternative metal recovery methods for spent electroplating baths are needed. Supercritical extraction waste metals using CO2 is potential candidate this process. However, because the high-cost supercritical fluid processing equipment, an system modeled on use liquid rather than may be more economical. For reason, containing β-diketones as solvent removal Ni2+ and Zn2+ from solution was investigated compared to results obtained with CO2. Acetylacetone (ACAC) its fluorinated analogues were used ligands bath. While ACAC showed a higher efficiency, over 70% both extracted 100-fold molar excess ACAC. With isopropyl alcohol modifier, extracti...