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Controlled Multiphase Oxidation for Continuous Production of Fine Chemicals

Author(s):

Praveen Kumar Yadav , Dr. Ambedkar Institute Of Technology For Handicapped, Kanpur, India; Rahul Singh Penti, Dr. Ambedkar Institute Of Technology For Handicapped, Kanpur, India; Yogesh Saini, Dr. Ambedkar Institute Of Technology For Handicapped, Kanpur, India; Gulshan Yadav, Dr. Ambedkar Institute Of Technology For Handicapped, Kanpur, India; Ashutosh Mishra, Dr. Ambedkar Institute Of Technology For Handicapped, Kanpur, India

Keywords:

Biphasic Liquid-Liquid Oxidation, Intensification, Flow Chemistry, Oscillatory Flow Reactor, Electrochemistry

Abstract

The feasibility of an integrated continuous biphasic oxidation process was studied, incorporating (i) electrochemical generation of an oxidant, (ii) membrane emulsification and an Oscillatory Flow Reactor (OFR) to facilitate mass-transfer in a biphasic reaction system and (iii) product extraction to enable regeneration of the oxidant. The biphasic, organic solvent-free dihydroxylation of styrene by ammonium peroxodisulfate solutions (including electrochemically generated peroxodisulfate) was investigated as a model reaction, both in batch and in an OFR. Heating of peroxodisulfate in a strongly acidic solution was demonstrated to be essential to generate the active oxidant (Caro’s acid). Membrane emulsification allowed mass-transfer limitations to be overcome, reducing the time scale of styrene oxidation from several hours in a conventional stirred tank reactor to less than 50 min in a dispersion cell. The influence of droplet size on overall reaction rate in emulsions was studied in detail using fast image capturing technology. Generation of unstable emulsions was also demonstrated during the oxidation in OFR and product yields >70% were obtained. However, the high-frequency/high-displacement oscillations necessary for generation of fine droplets violated the plug flow regime. Membrane emulsification was successfully integrated with the OFR to perform biphasic oxidations.

Other Details

Paper ID: IJSRDV6I22053
Published in: Volume : 6, Issue : 2
Publication Date: 01/05/2018
Page(s): 3583-3587

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