The application of fine TiO2 particles for enhanced gas absorption

✍ Scribed by M.V Dagaonkar; H.J Heeres; A.A.C.M Beenackers; V.G Pangarkar

• Book ID: 104427208
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 130 KB
• Volume: 92
• Category: Article
• ISSN: 1385-8947
• DOI: 10.1016/s1385-8947(02)00188-2

✦ Synopsis

The physical absorption of pure CO 2 in various liquids (water, hexadecane, and sunflower oil) containing micron sized TiO 2 particles has been investigated. Absorption studies were carried out in a batch stirred cell reactor at 298 K and initial pressures of 0.08 MPa. Solid loading and stirring intensities were varied systematically between 0-15 kg/m 3 and 3.3-12.5 s -1 , respectively. Gas absorption rates are enhanced significantly in the presence of TiO 2 particles. Enhancement factors are a function of the solids loading and stirring intensity. Maximum enhancement factors of about 2 were observed for all solvents at low stirring intensities. The rate of gas absorption was theoretically analyzed using a heterogeneous unsteady state mass transfer model based on the Danckwerts surface renewal theory and a Langmuir-type of particle to interface adhesion isotherm. This model not only predicts the trends in the observed enhancement factors very well but also gives an accurate quantitative picture.