Importance of slip velocity in determining growth and nucleation kinetics in continuous crystallization

✍ Scribed by Howard N. Rosen

• Publisher: American Institute of Chemical Engineers
• Year: 1974
• Tongue: English
• Weight: 323 KB
• Volume: 20
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690200227

✦ Synopsis

Nucleation and growth kinetics have been investigated for many crystallization systems from analysis of the steady state population density distribution of mixed suspension, mixed product removal ( MSMPR) crystallizers (Randolph and Larson, 1971). Plots of the logarithm of crystal population density (CPD) n against particle size L have been shown to be linear for a great many crystallization systems, and for the following relationship:

Growth rate data can be obtained from the slope of the logarithm of n versus L, and nucleation data from the intercept when L = 0. Two basic assumptions are important to the derivation of Equation ( 1): (1) nucleation spontaneously occurs at a size very close to L = 0; (2) growth rate is not size dependent.

In more recent years, a careful examination of the small size range of the CPD has shown a break from linearity in the 50 to 100-pm region. Investigations of Glauber's salt