Fengjun Jiao

A simple and efficient synthesis protocol for sulfonation of nitrobenzene under solvent-free conditions via a microreactor

A simple and efficient method for the sulfonation of nitrobenzene using SO3 as the sulfonating agent in a microreactor was developed and conducted in this work. The reaction enthalpy was determined using a microreactor-based calorimeter. The effects of molar ratio of reactants, reaction temperature and liquid hourly space velocity (LHSV) on the reaction performance were experimentally studied under solvent-free conditions. Under optimized reaction conditions, 94% conversion of nitrobenzene (NB) and 88% yield of meta-nitrobenzenesulfonic acid (m-NBSA) was obtained even when the residence time was less than 2 s. A microreactor-batch set-up was fabricated and developed to completely convert NB. The process safety has been improved and reaction time has been reduced compared to the batch method. These results demonstrate that the multifunctional integrated microreactor is an extremely useful and highly efficient tool for the sulfonation of NB under solvent-free conditions.

Influence of precursors on the catalytic activity of alumina for bio-ethanol dehydration in microchannel reactors

In this paper, the catalytic activity of alumina for bio-ethanol dehydration was studied in a microchannel reactor. Five catalysts were prepared from precursors with different ratios of AlOOH (pseudo boehmite) and Al(OH)3 (bayerite). The physicochemical properties of catalysts were characterised by X-Ray Diffraction (XRD) and Temperature Programmed Desorption (TPD). The influence of reaction temperature and space velocity was investigated. The results show that the catalyst prepared from precursor with AlOOH 46.3 mol% has the highest ethanol conversion and ethylene selectivity. An ethylene yield of 18.28 g/(gcat⋅h) can be achieved, implying that the dehydration process can be intensified using microchannel reactors.