Loading...

Synthesis and Surface Treatment of Nanoparticles to Evaluate the Effect of Their Presence on the Mass Transfer in the Stirred Liquid-Liquid Extraction Systems

Hatami, Ashkan | 2014

820 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46338 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical & Petroleum Engineering
  6. Advisor(s): Bastani, Daruoosh; Najafi, Farhod
  7. Abstract:
  8. In this study the effect of nanoparticles on the mass transfer of dispersed phase in the liquid-liquid extraction systems, containing toluene with acetic acid as dispersed phase and saturated water of toluene as continues phase was investigated. For the ease of dispersion of nanoparticles in nonpolar organic dispersed phase, with the use of a novel method, hydrophobic tiania nanoparticles were synthesized and during producing with the sole-gel method were modified by adding Tetraethyl Ortho titanate as modifying agent, also the smallest hydrophobic nanoparticles of magnetite were synthesized by co-precipitating method and then, under optimum thermal condition were coated by adding Oleic Acid. Investigating of crystal size, Functionalization, degree of hydrophobicity, structure and stability of particles with the aim of Fe-SEM, FT-IR, contact angle, XRD and UV-visible analysis were done. Their results indicated production of Titania and Magnetite nanoparticles with sizes of 25 and 16 nm, respectively. Study of nanoparticles effect has been done with mass concentrations of 0.001 to 0.005 % under conditions of static and mixing of continuous phase in the two different liquid-liquid extractors each having 50cm length and 10 cm diameter. In each experiment with the use of a syringe pump, dispersed phase was interred to the bottom of column through a glass nozzle. All experiments were done with two Nozzle tips having 1 and 2.5 cm in diameter and two different concentration of 3 and 6 weight percent of Solute. Without mechanical mixer, with the use of 2.5mm nozzle tip, 3 percent of Acid concentration and 0.001 weight percent of Magnetite nanoparticles, the maximum increase of 103% and 41.55% were achieved for the mass transfer coefficient and extraction efficiency, respectively. Whereas, in the stirred condition of 330 rpm, in the all cases of using Nano-fluids the efficiency was decreased. But in the situation of 450 rpm, at 6% concentration of Solute and high concentration of nanoparticles a small increase in the extraction efficiency was detected. The highest increase was 0.29 % which detected in 0.005 weight percent of the magnetite nanoparticle and use of 1 mm nozzle tip
  9. Keywords:
  10. Liquid-Liquid Extraction ; Surface Functionality ; Mass Transfer ; Magnetic Nanodot ; Mechanical Stirring ; Titania Nanoparticles

 Digital Object List

 Bookmark

No TOC