CONTINUOUS PRECIPITATION OF MONODISPERSED COLLOIDAL PARTICLES .2. SIO2, AL(OH)(3), AND BATIO3

Colloidal spherical particles of SiO2, AI(OH)(3), and BaTiO3 of narrow size distributions were produced in a continuous static mixer tubular reactor system. Several experimental parameters, including the flow r ate, reaction temperature and time, reactant concentrations, and the d imensions of the reactor, were varied in order to establish the optimu m conditions required for each material. The results were compared wit h those obtained in batch systems. Monodispersed colloids can be gener ated at a rate as high as 50 pounds per day using the described labora tory scale continuous reactor.