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Characterization of Micromixing and Determination of Mass-Transfer Coefficient in a new Double-Spinning-Disk Contactor

Mirzaei, Mohammad Ali | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51196 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaei Dehkordi, Asghar
  7. Abstract:
  8. High mixing efficiency and high liquid-liquid mass transfer rate are two key features of spinning disk contactors. This work presents the experimental investigation of mixing and liquid-liquid mass transfer characteristics in a new double coaxial spinning disks contactor. The micromixing efficiency was investigated using a standard system of competitive parallel reaction known as iodide/iodate test reaction. The influences of various operating conditions such as the rotational speed of the disks, the direction of rotation, the feed radial location, the feed distribution pattern, the distance between the disks, and the feed flow rate on the mixing quality were examined carefully. The obtained experimental results show with an increase in the rotational speed, the radial distance of one of the feeds to the disk center, and the number of feed points as well as with a decrease in the distance between the disks and the feed flow rate the mixing quality can be improved. The liquid-liquid mass transfer experimental runs were conducted using water-acetic acid- toluene system (acetic acid was extracted from toluene by means of water). The influences of different operating conditions such as the rotational speed of the disks, the direction of rotation, the distance between the disks and the feed flow rate on the overall volumetric mass transfer coefficient were investigated. The obtained experimental results show that with an increase in the rotational speed, and the feed flow rate as well as with a decrease in the distance between the disks the overall volumetric mass-transfer coefficient can be enhanced. The overall volumetric mass-transfer coefficients, k_L a, of up to 38.01 min^(-1) were obtained. It can be concluded from the obtained experimental results that in the field of mixing and liquid-liquid mass transfer, the new double spinning disks contactor is superior relative to other types of spinning disks contactors and other conventional contactor types
  9. Keywords:
  10. Spinning Disk Reactor ; Mixing ; Spinning Disk Contactor ; Liquid-Liquid Mass Transfer ; Iodide/Iodate Test Reaction System ; Toluene-Acetic Acid-Water System

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