Transport Phenomena in Catalytic Hydrocracking of Polystyrene in Solution

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• 作者：Edwin G. Fuentes-Ord贸帽ez ; Joseba A. Salbidegoitia ; Mar铆a P. Gonz谩lez-Marcos ; Juan R. Gonz谩lez-Velasco
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：October 23, 2013
• 年：2013
• 卷：52
• 期：42
• 页码：14798-14807
• 全文大小：349K
• 年卷期：v.52,no.42(October 23, 2013)
• ISSN：1520-5045

文摘

Mass transfer analysis in any experimental system is fundamental before studying its kinetics or optimizing a catalyst. The effect of several variables, such as stirring rate, catalyst concentration and particle size, hydrogen pressure, reaction temperature, polystyrene concentration and average molecular weight, both from the experimental and the theoretical point of view, have been studied in the catalytic hydrocracking of polystyrene dissolved in decahydronaphthalene carried out in a stirred tank with hydrogen and catalyst (0.58 wt % Pt/H-尾) in a slurry. The results show that the variables could be adequately selected to prevent both gas鈥搇iquid and liquid鈥搒olid mass transfer control. However, severe internal diffusion control occurred as a consequence of polymer molecular dimensions that, in practice, limits the reaction to the outer surface area of the catalyst. Thus, catalyst optimization for this application, and catalytic processes with polymer reactants in general, should be focused on maximizing external surface area.