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Reactive Crystallization of Calcium Carbonate Nanoparticles in Impinging Jets Reactors

Habibi, Amir Hossein | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43291 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaei, Asghar
  7. Abstract:
  8. Due to their highly efficient micromixing rates, confined impinging jet reactors can be beneficial in treating mixing-sensitive processes such as precipitations or crystallizations at high supersaturation. Successful scale-up of these reactors requires a decent insight of geometric design and operating conditions of these systems. This paper deals with the reactive crystallization of calcium carbonate nano-particles in two-impinging jets reactors. The influence of jet velocity (Jet Re number), nozzle diameter, and chamber ratio on the PSD and mean particle size of the product are investigated. In addition, the effect of supersaturation ratio, ion ratio and quenching ratio on the nucleation, growth and agglomeration of the calcium carbonate nanoparticles are analyzed. By increasing the jet velocity, number averaged particle size (d10) of the particles is reduced. However, the volume-averaged particle size (d43) of the particles seems to increase slightly at too high velocities. It was also found that the mean particle size is significantly decreased by increasing the supersaturations and quenching ratio. Also, excess cations of calcium prove to be the potential determining ions in crystallization of calcium carbonate and can decrease the mean particle size of the product.


  9. Keywords:
  10. Particles Size Distribution ; Reactive Crystallization ; Calcium Carbonate Nanoparticles ; Impinging Jet Reactor ; Chamber Ratio

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