Kinetics of homogeneous 5-hydroxymethylfurfural oxidation to 2,5-furandicarboxylic acid with Co/Mn/Br catalyst

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• 作者：Xiaobin Zuo ; Amit S. Chaudhari ; Kirk Snavely ; Fenghui Niu ; Hongda Zhu ; Kevin J. Martin and Bala Subramaniam
• 刊名：AIChE Journal
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：63
• 期：1
• 页码：162-171
• 全文大小：582K
• ISSN：1547-5905

文摘

2,5-furandicarboxylic acid (FDCA) is a potential non-phthalate based bio-renewable substitute for terephthalic acid-based plastics. Herein, we present an investigation of the oxidation rate of 5-hydroxymethylfurfural (HMF) to FDCA in acetic acid medium using Co/Mn/Br catalyst. Transient concentration profiles of the reactant (HMF), intermediates [2,5-diformylfuran (DFF), 5-formyl-2-furancarboxylic acid (FFCA)], and the desired product (FDCA) were obtained for this relatively fast reaction in a stirred semi-batch reactor using rapid in-line sampling. Comparison of the effective rate constants for the series oxidation steps with predicted gas–liquid mass transfer coefficients reveals that except for the FFCA → FDCA step, the first two oxidation steps are subject to gas–liquid mass transfer limitations even at high stirrer speeds. Novel reactor configurations, such as a reactor in which the reaction mixture is dispersed as fine droplets into a gas phase containing oxygen, are required to overcome oxygen starvation in the liquid phase and further intensify FDCA production.