Selected rheological models used for emulsions were verified experimentally and critically discussed. Emulsions were generated in the agitated internal loop coaxial reactor.
A mean droplet diameter decreased asymptotically up to a certain final value with emulsification time. The largest solid particles were obtained for N = 40 s-1. Going beyond this value resulted in a decrease of the precipitated solid particle size. An increase of the concentration of reagents, as well as a decrease of the emulsifying agent concentration caused a decrease of the calcium carbonate solid particle size.
The characteristic of emulsions generated in the internal loop two-column reactor with mechanical agitation is presented. The phase inversion, circulation velocity and circulation-dependent apparent viscosities of emulsion containing water, paraffin oil and silicon oil are discussed. It is shown that the inversion point can be identified on the basis of emulsion apparent viscosity.
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Badano przebieg procesu precypitacji węglanu wapnia z roztworu wodorotlenku wapnia za pomocą dwutlenku węgla w reaktorze typu airlift. Zbadano wpływ czasu nagazowania, prędkości przepływu dwutlenku węgla i prędkości przepływu mieszaniny dwutlenku węgla i powietrza na wielkość otrzymywanych cząstek. W czasie procesu mierzono zmiany pH mieszaniny reakcyjnej oraz stopień zatrzymania gazu.
EN
Calcium carbonate particles have been obtained in the reaction ofcalcium hydroxide with carbon dioxide m the intemal loop airlift reactor. Influence of the time of the proces, the velocity of carbon dioxide and the yelocity of carbon dioxide - air mixture on the precipitated particle diameter have been mvestigated. pH value and gaś hold-up in the reactor have been measured during precipitation.
Emulsions containing water and paraffin oil are obtained in the internal loop two-column reactor with agitation in the draft-tube as a riser. The continuous water phase circulation velocity increases with an increase of the propeller diameter. Flow of emulsions is similar to the plug flow. The phase inversion is proceeded by the formation of multiple emulsion. Droplet size distributions show a bimodal characteristic. The maxima are observed for several tens nanometers and for a few micrometers of the droplet size,
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