Wet oxidation of glycerol into fine organic acids: catalyst selection and kinetic evaluation

Brazilian Journal of Chemical Engineering

J. E. N. Brainer²  D. C. S. Sales²  E. B. M. Medeiros¹  N. M. Lima Filho²  C. A. M. Abreu² 

[1] ,Universidade Federal de Pernambuco Departamento de Engenharia Química Laboratório de Processos Catalíticos, LPCRecife PE ,Brazil

关键词: Glycerol oxidation;    Catalysts;    Glyceric acid;    Kinetics;    Modeling;   

DOI  :  10.1590/0104-6632.20140314s00002655

来源: SciELO

【 摘 要 】

The liquid phase oxidation of glycerol was performed producing fine organic acids. Catalysts based on Pt, Pd and Bi supported on activated carbon were employed to perform the conversion of glycerol into organic acids at 313 K, 323 K and 333 K, under atmospheric pressure (1.0 bar), in a mechanically agitated slurry reactor (MASR). The experimental results indicated glycerol conversions of 98% with production of glyceric, tartronic and glycolic acids, and dihydroxyacetone. A yield of glyceric acid of 69.8%, and a selectivity of this compound of 70.6% were reached after 4 h of operation. Surface mechanisms were proposed and rate equations were formulated to represent the kinetic behavior of the process. Selective formation of glyceric acid was observed, and the kinetic parameter values indicated the lowest activation energy (38.5 kJ/mol) for its production reaction step, and the highest value of the adsorption equilibrium constant of the reactant glycerol (10-4 dm³/mol).

【 授权许可】

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