Partial Wetting in Trickle Bed Reactors: Measurement Techniques and Global Wetting Efficiency

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• 作者：Lo&iuml ; c Baussaron ; Carine Julcour-Lebigue ; Anne-Marie Wilhelm ; Christophe Boyer ; Henri Delmas
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：December 5, 2007
• 年：2007
• 卷：46
• 期：25
• 页码：8397 - 8405
• 全文大小：524K
• 年卷期：v.46,no.25(December 5, 2007)
• ISSN：1520-5045

文摘

Three very different techniques for measuring the catalyst wetted fraction-or wetting efficiency-in tricklebed reactors have been carried out and compared. The first one based on pressure drop data performedsuccessively in single gas then liquid phases and, then, in a gas-liquid phase is experimentally very simplebut did not result in meaningful wetting efficiency estimation. The other ones, based on RTD analysis and ondye adsorption on wetted surfaces, gave similar results and were used to investigate different parameters:liquid velocity and gas molecular weight and pressure by RTD, liquid-solid interaction or affinity (contactangle) and particle shape and diameter by dye fixation. The main operating parameter is the liquid velocitywhile the effect of gas flow is very weak. Higher solid-liquid affinity (heptane versus water) improveswetting efficiency only at very low liquid velocity (<2 × 10^-3 m/s).