Adsorbent Surface properties modification by Using Flux Irradiation and Modelling of Dynamic Adsorption in a Fixed-Bed Column

• Main Authors: Chin-Chung Chung, 鍾錦軍
• Other Authors: Tsair-Wang Chung
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/28105142230274149182

碩士 === 中原大學 === 化學工程學系 === 87 === Abstract The objective of this study was to increase the adsorbent uptake in a solid-desiccant-dehumidification system by using the neutron flux irradiation technology. The commercial activated carbons and silica gels were doped with boron-10 to produce the alpha particles during fast neutron irradiation. The alpha particles bumped the crystals to enhance microscopic damage and/or to increase microporous zones within the solid. Also, the hidden micropores could be broken and connected with the other micropores, which are opened to the surface of the adsorbent to increase the effective adsorption area. Generally, only half of the pores belong to micropores and supermicropores, and are useful in most of the adsorption processes. Under the operating conditions, the amount of moisture adsorption by the modified adsorbent was increased by more than 18.8 % of that of the activated carbon and 23% of commercial silica gel. A mathematical model of breakthrough curves was developed to describe the adsorption of a pure compound in a packed column. It is possible to make reasonable estimates of breakthrough curves under different operating conditions by this model. In this study, an accurate correlation for the sorption isotherm was needed to predict the breakthrough curves. Although the isotherms of Langmuir and Freundlich were used to describe the monolayer chemsorption, the isotherms of porous materials resembled to Langmuir or Freundlich isotherms in middle to low concentration range. The proposed model was adopted in the work and the results show that was suitable to simulate the modified silica gel.