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Synthesis of Calcium Carbonate in Impinging-jet's Reactor

Adavi, Kazem | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50654 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaei Dehkordi, Asghar
  7. Abstract:
  8. In this research work, a two-impinging-jets reactor (TIJR) has been designed and tested to synthesis calcium carbonate nanoparticles. The application of calcium carbonate nanoparticles in various industries including health, food industry, pharmacy, etc., and the dependence of product quality on properties such as morphology and particle size distribution, persuaded us to study the synthesis of calcium carbonate nanoparticles in the designed TIJR. The precipitation processes are fast chemical processes and mixing plays an important role in the final product quality. TIJR have come to the attention of researchers because of the low micromixing time in recent years. In this research work, liquid-liquid reaction was used to synthesis these nanoparticles. In this regard, feed solutions of sodium carbonate and calcium chloride were introduced into the TIJR chamber using the peristaltic pumps. Various samples were taken after reaching the steady state conditions. Then, after washing the remaining cake, it was dried at 60 ° C for 2 hours. The effects of different parameters such as the temperature of the initial feed solutions, the solvent residence time in the sample collection container, the washing solvent, the surfactant, the solution feed flow rate, the reactor dimensions, the nozzle diameter, and the supersaturation on the size distribution of the nanoparticles and the corresponding mean particle size were investigated carefully. The analysis of DLS, XRD, SEM, and EDX were used to evaluate the quality of the final product. The obtained results show that by decreasing the temperature, the nozzle diameter, and reactor diameter, the mean particle size of calcium carbonate nanoparticles decreases. In addition, experimental results obtained also indicate that with an increase in the supersaturation and the initial feed flow rate, the mean particle size decreases. Finally, calcite and aragonite with mean particle sizes of 59 nm and 43 nm were synthesized, respectively
  9. Keywords:
  10. Calcium Carbonate ; Impinging Jet Reactor ; Crystallization ; Nanoparticles ; Reactive Crystallization

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