Investigation of a rotating disc reactor for acetone stripping and asymmetric transfer hydrogenation: Modelling and experiments

Asymmetric transfer hydrogenation of acetophenone with isopropanol as hydrogen donor in the presence of a homogeneous catalyst was investigated in a rotating disc reactor. Initially, acetone stripping from binary mixtures acetone-isopropanol with nitrogen as inert gas was studied, since its removal is a key issue in improving reaction performance. The reactor consisted of a stainless steel disc mounted on a horizontal shaft, accommodated in a cylindrical shell. The disc was partially immersed in the liquid phase. Its rotation generated a thin liquid film on its upper part, which could be brought in contact with a gas phase used for stripping. A mathematical model was formulated to simulate the reactor and showed good agreement with experimental data for acetone stripping. It was observed that the efficiency of acetone removal from the liquid phase increased with the gas flowrate per initial liquid volume ratio. The effect of disk rotation was found to be small when the stripping gas was introduced in the liquid bulk. The reactor model agreed well with experimental data of the asymmetric transfer hydrogenation. An advantage of the rotating disk reactor is that the hydrodynamics of the phases can be decoupled and the gas flowrate can be increased without constraints in the liquid phase, unlike conventional agitated reactors that are limited by flooding. Simulations using high stripping gas flowrate per initial liquid volume, unachievable in stirred reactors, showed significant reduction of the residence time required to achieve > 99% conversion. (c) 2006 Elsevier Ltd. All rights reserved.

[1]  L. Di Palma,et al.  A steady-state model for the evaluation of disk rotational speed influence on RBC kinetic: model presentation. , 2003, Bioresource technology.

[2]  C. Hardacre,et al.  Use of a batch rotating photocatalytic contactor for the degradation of organic pollutants in wastewater , 2001 .

[3]  Yi Wang,et al.  Physical modelling and numerical simulation of velocity fields in rotating disc contactor via CFD simulation and LDV measurement , 2000 .

[4]  J. Laîné,et al.  Oxidation of organic contaminants in a rotating disk photocatalytic reactor: reaction kinetics in the liquid phase and the role of mass transfer based on the dimensionless Damköhler number , 2002 .

[5]  A. Gavriilidis,et al.  Asymmetric Transfer Hydrogenation of Acetophenone with 1R,2S-Aminoindanol/Pentamethylcyclopentadienylrhodium Catalyst , 2004 .

[6]  Sanjeev Chaudhari,et al.  Model for oxygen transfer in rotating biological contactor. , 2004, Water research.

[7]  W. Fei,et al.  Hydrodynamics and Mass Transfer Performance of a Modified Rotating Disc Contactor (MRDC) , 2002 .

[8]  D. Rooney,et al.  Use of a rotating disc reactor to investigate the heterogeneously catalysed oxidation of cinnamyl alcohol in toluene and ionic liquids , 2005 .

[9]  J. Laîné,et al.  Continuous-mode photocatalytic degradation of chlorinated phenols and pesticides in water using a bench-scale TiO2 rotating disk reactor , 2000 .

[10]  L. Doraiswamy,et al.  Triphase catalysis: a correlation for Sherwood number using the rotating disk contactor (RDC) developed earlier , 2001 .

[11]  M. Velan,et al.  Gas-Liquid mass transfer in a down flow jet loop reactor , 1992 .

[12]  F. Talens-Alesson,et al.  The modelling of falling film chemical reactors , 1999 .

[13]  E. Davis,et al.  An analysis of the falling film gas-liquid reactor , 1979 .

[14]  C. Boelhouwer,et al.  Liquid film thickness in a rotating disc gas-liquid contactor , 1978 .

[15]  M. Moo-young,et al.  The continuous phase heat and mass transfer properties of dispersions , 1961 .

[16]  Mohammad R. Riazi,et al.  Modelling of falling film reactors , 1996 .

[17]  A homogeneous-heterogeneously catalysed reaction system in a loop reactor , 1999 .

[18]  Ryoji Noyori,et al.  Asymmetric catalysis: science and opportunities (Nobel lecture). , 2002, Angewandte Chemie.

[19]  Carlos A. V. Costa,et al.  Two different approaches for RDC modelling when simulating a solvent deasphalting plant , 2002 .

[20]  J. S. Rowlinson,et al.  Molecular Thermodynamics of Fluid-Phase Equilibria , 1969 .

[21]  C.A.M.C. Dirix,et al.  Mass transfer in jet loop reactors , 1990 .

[22]  K. Choi,et al.  Melt polycondensation of bisphenol A polycarbonate by forced gas sweeping process II. Continuous rotating-disk reactor , 2001 .

[23]  L. Doraiswamy,et al.  Triphase catalysis: a new rotating disk contactor for measuring mass transfer coefficients , 1998 .

[24]  C. Bennett,et al.  Momentum, Heat, and Mass Transfer , 1962 .

[25]  Physical mass transfer in a rotating disc gas-liquid contactor , 1979 .

[26]  Kamelia Boodhoo,et al.  Process intensification: spinning disk reactor for styrene polymerisation , 2000 .

[27]  Effects of disc rotational speed and submergence on the performance of an anaerobic rotating biological contactor , 1997 .

[28]  Colin Ramshaw,et al.  Evaluation of a Spinning Disc Reactor for Continuous Processing1 , 2001 .

[29]  Ryoji Noyori Prof..  Asymmetric Catalysis: Science and Opportunities (Nobel Lecture) , 2002 .

[30]  P. S. Puri,et al.  Vapor-liquid equilibriums of acetone-cyclohexane and acetone-isopropanol systems at 25.deg. , 1974 .

[31]  Y. Takenaka,et al.  Simulation of citric acid production by rotating disk contactor. , 1997, Biotechnology and bioengineering.

[32]  Harvey D. Mendelson.  The prediction of bubble terminal velocities from wave theory , 1967 .

[33]  C. C. Pantelides,et al.  A modelling and simulation language for combined lumped and distributed parameter systems , 1996 .

[34]  Donald Nelson Miller,et al.  Scale‐up of agitated vessels gas‐liquid mass transfer , 1974 .

[35]  G. Froment,et al.  Chemical Reactor Analysis and Design , 1979 .

[36]  Rosário Oliveira,et al.  Denitrification in a closed rotating biological contactor: effect of disk submergence , 2001 .

[37]  G. Banerjee.  Hydraulics of bench-scale rotating biological contactor , 1997 .