Synthesis of Nano-sized Calcium Carbonate Particles Using an Impinging Jet Reactor: Influences of Tempreature, Retention Time, and Elutant

فاقد چكيده فارسي

In this paper, a number of calcium carbonate synthesis experiments have been conducted using an impinging jets reactor to evaluate the effects of temperature, retention time, and elutant on the nanoparticles mean size and size distribution. This type of reactors require much lower residence times for the reactions; hence, they have attracted much attention in recent years. Solutions were injected into the nozzles and reacted where they met each other. To examine the impact of the temperature on the nanoparticles, the experiments were conducted at four different temperatures of 5, 30, 80 and 90 °C. The temperature reduction decreased the rate of primary nucleation, consequently, the number of produced nucleuses. It was found that increasing the temperature results in bigger nanoparticles. To explane the effect of the retention time on the size distribution of the nanoparticles, three different residence times of 3, 30 and 60 min were considered. It was observed that particles’ mean size increases as the retentation time increases. Moreover, it was found that the percentage calcite gradually increases and simultaneously the amount of aragonite decreases.Washing the synthesized nanoparticles with normal butanol could significantly decrease the particles’ mean sizes compared to at obtained using distilled water. The obtained results indicate that the configuration system used led to an improvement in the synthesis of nano-sized calcium carbonate particles with an average size of 45 nm.