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Micromixing in a single‐feed semi‐batch precipitation process
Author(s) -
Phillips R.,
Rohani S.,
Baldyga J.
Publication year - 1999
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.690450108
Subject(s) - micromixing , mixing (physics) , precipitation , nucleation , microscale chemistry , supersaturation , chemistry , particle size , particle (ecology) , particle size distribution , volumetric flow rate , materials science , chemical engineering , chromatography , thermodynamics , analytical chemistry (journal) , meteorology , mathematics , physics , mathematics education , oceanography , organic chemistry , quantum mechanics , engineering , geology
A mixing‐precipitation model (based on engulfment, the E‐model by Baldyga and Rohani, 1987) is applied to a single‐feed semi‐batch precipitation process to describe the mixing effects on the final particle‐size distribution (PSD) and particle morphology. The model describes mixing on two scales: the microscale (at which the flow directly affects nucleation and growth phenomena in the mixed‐precipitation (MP) zone) and a macroscale (which controls the environment for the MP‐zone). Application of the model is limited to 1≪Sc<4,000 and slow feed addition rates. When the model was applied to experimental results of BaSO 4 precipitation, satisfactory agreement between predicted and observed results was obtained. Experiments were carried out in a single‐feed 18‐L Rushton reactor, whereby the effects of various operating conditions such as feed rate, intensity of mixing, mean initial reactant concentration and reactant volume ratio on barium sulfate precipitation process were investigated.