Collect. Czech. Chem. Commun. 1985, 50, 2053-2059

Analysis of the system precipitation reactor-separator. Effect of crystal growth mechanism on the filtration properties of a suspension produced in a continuous reactor

Otakar Söhnel

Chemopetrol, Research Institute of Inorganic Chemistry, 400 60 Ústí nad Labem


The filtration properties of a suspension of a sparingly soluble substance produced in a MSMPR (mixed suspension mixed product removal) crystallizer with a mean residence time tz have been studied as a function of the crystal growth mechanism. The slope, n, of the log α vs log tz plot, where α is the specific mass filtration resistance, takes values of 0, 1, and 2 for the mononuclear, diffusion, and screw-dislocation mechanisms, respectively. If solid phase coagulation occurs, n takes values below 2. For the size-dependent growth, n may become greater than 2.