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Adduction in the decane‐urea‐ethanol system: Part II. Kinetic studies
Author(s) -
Tamarelli A. W.,
Manning F. S.
Publication year - 1967
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690130212
Subject(s) - decane , mixing (physics) , chemistry , nucleation , mass transfer , dimensionless quantity , supersaturation , urea , slurry , thermodynamics , reaction calorimeter , kinetic energy , analytical chemistry (journal) , calorimetry , chromatography , organic chemistry , physics , quantum mechanics
Supersaturated solutions with randomly distributed seed crystals were formed by jet mixing of saturated slurries of urea—decane adduct and decane—urea—ethanol solutions. The resulting crystal growth rates were measured quantitatively with a rapid‐mixing, stopped‐flow calorimeter. Nucleation of additional crystals was negligible. Times required for 90% adduction ranged between 0.375 and 25.5 sec., a 68‐fold variation. A single dimensionless chronomal which adequately represented all the kinetic data was obtained. In all runs, liquid phase mass transfer appeared to control the rate of adduction, despite the fact that the rapid mixing greatly reduced mass transfer resistance. Whereas the data were consistent with several equations describing models based on diffusional rate control, the results did not support mechanisms involving surface phenomena.