Imaging of liquid distribution in reactive distillation packings with a new high-energy x-ray tomograph

We describe a new, high-energy (420 kV), large-scale (0.45 m in diameter, 4 m in height) x-ray tomograph developed to investigate gas and liquid flow through fixed bed like absorption, distillation and reactive distillation columns. The first results obtained with this set-up on test objects (physical phantoms), such as a cylindrical container filled with water or a large diameter structured metallic packing, validate the technique as a quantitative tool for geometrical measurements. Very detailed two-dimensional (2D) and three-dimensional (3D) images of a 0.09 m diameter KATAPAK-SP 12, a reactive distillation packing, are presented. Quantitative information relative to liquid hold-up distribution may be obtained from tomographic imaging performed on an irrigated column packed with this element.

[1]  Richard A Williams,et al.  Process tomography: a European innovation and its applications , 1996 .

[2]  R. Eldridge,et al.  The experimental application of X-ray tomography to a vapor–liquid contactor , 2001 .

[3]  R. B. Eldridge,et al.  Investigation of X-ray imaging of vapor–liquid contactors. 1. Studies involving stationary objects and a simple flow system , 2004 .

[4]  A. Kannan,et al.  Holdup and pressure drop studies in structured packings with catalysts , 2004 .

[5]  Matthew H. M. Lim,et al.  MRI visualisation of two-phase flow in structured supports and trickle-bed reactors , 2003 .

[6]  Christophe Boyer,et al.  Measurement of liquid flow distribution in trickle bed reactor of large diameter with a new gamma-ray tomographic system , 2002 .

[7]  Dominique Toye,et al.  Local measurements of void fraction and liquid holdup in packed columns using X-ray computed tomography 1 This contribution is dedicated to the remembrance of Professor Jaques Villermaux. 1 , 1998 .

[8]  R. B. Eldridge,et al.  Investigation of X-ray imaging of vapor–liquid contactors. 2. Experiments and simulations of flows in an air–water contactor , 2004 .

[9]  Peter Moritz,et al.  Reactive distillation with KATAPAK , 2001 .

[10]  Z. Olujic,et al.  Liquid distribution images on structured packing by X‐ray computed tomography , 2001 .

[11]  Lynn F. Gladden,et al.  New insights to trickle and pulse flow hydrodynamics in trickle-bed reactors using MRI , 2004 .

[12]  Milorad P. Dudukovic,et al.  Countercurrent flow distribution in structured packing via computed tomography , 2005 .

[13]  Achim Hoffmann,et al.  Reactive distillation: Non-ideal flow behaviour of the liquid phase in structured catalytic packings , 2002 .

[14]  Rajamani Krishna,et al.  Counter-current operation of structured catalytically packed distillation columns: pressure drop, holdup and mixing , 1999 .

[15]  Z. Olujic,et al.  A general correlation for predicting the loading point of corrugated sheet structured packings , 1999 .