Study on the Mass Transfer of Ozone and the Ozonation of 2-Chlorophenol in Aqueous Solution with a Modified Rotating Packed Bed Reactor

• Main Authors: Chia-Ying Wu, 吳佳盈
• Other Authors: Young Ku
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/81696468689737921227

碩士 === 國立臺灣科技大學 === 化學工程系 === 98 === Abstract This study is focused on innovating rotating packed bed contactor (RPB), enhances the mass transfer and energy-saving efficiency. In conventional RPBs, the mass transfer coefficient is enhanced by centrifugal acceleration produced from motor, wasting energy at higher rotation. There is need to consider the energy-saving or high removal efficiency on the new design of RPB. However, the most energy consumption in RPB device is in the rotor by rotation that loading packing should be reduced as possible. Therefore, the main design is to modify the RPB by reducing the loading of packing with double centric baffles contains wire mesh in the lower rotating side to decrease the weight of rotor by rotation for energy saving, while the upper side of baffle was immobilized on the plate to enhance the gas-liquid contact surface area and shear force for improve mass transfer efficiency; the cover of modified RPB is made of borosilicate glass for easy observation. Experiments studied the 2-CP is used in aqueous solution as pollutant by ozonation in modified RPB. The removal efficiency in modified RPB was almost fast than traditional RPB and the energy consumption was reduced 66.4% that the modified RPB combine energy saving and strong mass transfer advantages. Besides, the volumetric mass transfer coefficient was increased with increasing rotor speed (ω0.29) and liquid flow rate (L0.38), the decomposition rate was ten times in alkaline solution than in acidic solution because of the ozone self-decomposition with base-catalyzed decomposition and species distribution in liquid phase. Key words: Rotating packed bed, mass transfer, ozone, energy consumption