Oxidation of 2,6-Dimethylnaphthalene by Co-Mn-Br Based Homogeneous Catalyst

Co-Mn-Br계 균일촉매를 이용한 2,6-Dimethylnaphthalene의 산화반응

  • Received : 1999.05.08
  • Accepted : 1999.08.18
  • Published : 1999.10.10

Abstract

The catalytic performance of Co-Mn-Br system was performed in the 2,6-dimethylnaphthalene(DMN) oxidation at relatively mild reaction conditions such as $160^{\circ}C$ and $6kg/cm^2$. Experiments were conducted using a $2{\ell}$ batch reactor with varying the concentrations of catalysts. The reaction route of DMN oxidation was considered by measuring the concentration of intermediate species. As the intermediate species, 2-formyl-6-naphthoic acid, 2-methyl-6-naphthoic acid and 2-hydroxymethyl-6-methylnaphthalene are found. It was found that the yield of 2,6-naphthalene dicarboxylic acid(NDA) is largely dependent on the Co and Br concentrations. In addition, it was observed that color-b was closely related with Mn concentration in this experimental range. The burning loss of solvent could be reduced by controlling the concentration of Mn and Br. Addition of small amount of Ce and Cu compounds led to increase the NDA yields and decrease the burning amount of solvent.

Keywords

2,6-dimethyl naphthalene(DMN);2,6-naphthalene dicarboxylic acid(NDA);Co-Mn-Br homogeneous catalyst;oxidation

Acknowledgement

Supported by : 과학기술부

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