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Catalysis in Green Chemistry and Engineering

ISSN Print: 2572-9896
ISSN Online: 2572-990X

Catalysis in Green Chemistry and Engineering

DOI: 10.1615/.2018020980
pages 91-103

SYNTHESIS OF 3-METHOXYCATECHOL FROM PYROGALLOL AND DIMETHYL CARBONATE IN LIQUID PHASE SLURRY REACTOR

Pooja R. Tambe
Department of Chemical Engineering, Institute of Chemical Technology, Nathalal Parekh, Marg, Matunga, Mumbai 400019, India
Riitta Keiski
Department of Mass and Heat Transfer, University of Oulu, Finland
Ganapati D. Yadav
Department of Chemical Engineering, Institute of Chemical Technology, University of Mumbai, Nathalal Parekh Marg, Matunga, Mumbai 400019, India

ABSTRACT

Selective mono O-methylation of pyrogallol (trihydroxy benzene) is traditionally carried out with a polluting homogenous base catalyst and various alkali salts. A heterogeneous catalytic system was developed to achieve the same in a liquid phase slurry reactor. Calcined hydrotalcite was synthesized by different synthesis routes, and its activity was studied for selective mono O-methylation of pyrogallol using dimethyl carbonate as a methylating agent. The reaction was optimized by studying different reaction parameters to illustrate the reaction kinetics. The reaction at optimum conditions, i.e., catalyst concentration of 0.035 g/cm3, 180°C, 1400 rpm, and mole ratio of pyrogallol to dimethyl carbonate (DMC) as 1:5 gave 52% conversion of pyrogallol with 89% selectivity toward 3-methoxy catechol. The catalyst is reusable over three cycles. The activation energy for the reaction was calculated as 8.81 kcal/mol. Use of DMC as the methylating agent adds the green content to the current work.


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