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Información tecnológica

versão On-line ISSN 0718-0764

Resumo

VIEIRA, Janine R. G; DE SOUSA, João F; DE OLIVEIRA, Jackson A  e  DE SOUZA, Carlson P. Kinetic Modeling and Assessment of Mo2C, Mo2N and Ni-Mo/C Catalysts in the Hydrogenation Reaction of Lactose. Inf. tecnol. [online]. 2010, vol.21, n.6, pp.149-162. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642010000600016.

The purpose of this study was evaluating Mo2C, Mo2N and Ni-Mo/C catalyzers in the catalytic hydrogenation of lactose to obtain lactitol. Hydrogenation experiments were done at 120°C and 68 atm. in a batch autoclave using mechanical agitation at 500 rpm, with a solution of commercial lactose, serum solution of raw cheese and serum solution after protein and chloride ion adsorption. Protein and chloride ion levéis decreased through chitosan coagulation and ion exchange demineralization, respectively. Furthermore, the pH was also tested in acidic (3.5) and basic médium (8). The best lactitol yield was 46% with Mo2C at pH 8 using commercial lactitol. The hydrogenation results obtained in the experiments were modeled by the Langmuir-Hinshelwood kinetics. The experimental results of lactose and lactitol concentration were similar to those predicted by the model.

Palavras-chave : kinetic modeling; hydrogenation; catalysts; lactose; chitosan.

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