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Please use this identifier to cite or link to this item: http://hdl.handle.net/2080/461

Title: Reduction of o-Nitroanisole to o-Anisidine by H2S-rich Aqueous Diethanolamine: A Novel Process for Utilization of H2S-laden Gas Streams
Authors: Maity, Sunil K.
Pradhan, N C
Patwardhan, Anand V.
Keywords: o-Anisidine
Claus process
Hydrogen sulfide
Multiphase reactions
Phase transfer catalysis
Reaction engineering
Issue Date: 2007
Publisher: Elsevier
Citation: Chemical Engineering Science 62 (2007) 805-813
Abstract: H2S-rich aqueous diethanolamine (DEA) solution, which could be obtained from amine treatment units (ATUs) of refineries, was utilized to prepare a value-added chemical, o-anisidine from o-nitroanisole (ONA) with co-production of elemental sulfur. The reduction of ONA was carried out under liquid-liquid mode in presence of phase transfer catalyst, tetrabutylammonium bromide (TBAB). The effects of DEA concentration and elemental sulfur loading on the conversion of ONA were suitably utilized to establish the stoichiometry and mechanism of the so-called Zinin reduction using H2S-rich aqueous DEA. The reaction was found to be kinetically controlled with apparent activation energy of 63.6 kJ/mol. The rate of reaction of ONA was also found to be proportional to the concentration of catalyst, to the cube of the concentration of ONA, and to the 1.63 power of the concentration of sulfide. An empirical kinetic model based on experimental observations was developed to correlate the experimentally ...
Description: Copyrighy for this article belongs to Elsevier Ltd.
URI: http://dx.doi.org/10.1016/j.ces.2006.10.007
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