Study of the solid-liquid solubility in the piperazine-H₂O-CO₂ system using FBRM and PVM

Solubility of piperazine in aqueous solutions was studied for a range of piperazine concentrations of from 17 to 70 wt% in a commercially available reactor system LabMax (Mettler Toledo) equipped with the probes for in-situ monitoring of the crystals formation and dissolution using focused beam reflectance measurements (FBRM) and particle vision and measurements (PVM). Effect of cooling and heating rates on the phase transition temperature and effect of CO₂ loading on solid-liquid solubility in piperazine-H₂O-CO₂ system were studied. It was shown that FBRM and PVM are very useful for studying the precipitation behavior in CO₂ capture processes with phase change solvents